Rolls-Royce Archives
| Identifier | Entry | ||
| img001 | Tests on tappet clearance and noise levels on a 40/50 standard camshaft. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Wor. c. to By. Ha/Rm.3/MJ.24.11.31. XJ090. X5090. TAPPET CLEARANCE. With reference to R.4/W16.11.31. We have made some tests on tappet clearance and noise. With the… | ||
| img002 | The position and testing of various electric clocks for cars. | ||
| View original record | To R. from EFC. c. Sg. c. Hor. R. c. Mr. Ev. PN. ORIGINAL EFC/AD2.12.30. X.6026. ELECTRIC CLOCKS FOR R.R. CARS X.6022. The position of electric clocks on R.R. cars is now as follows :- ROYCE. The… | ||
| img003 | The development and testing of various manufacturers' electric car clocks for the Phantom II chassis. | ||
| View original record | -2- It is sometimes argued that any car electric clock should be arranged to stop off contact with the battery disconnected or run down to prevent the continuous heating of the windings. This renders… | ||
| img004 | Faulty 'Delco' shock absorber and its planned replacement with two of the latest type. | ||
| View original record | To Da. From Hs/Rn. ORIGINAL Hs/Rn.11./MJ.16.12.30. 48371 We are sorry to say that the 'Delco' shock absorber we were getting for you has turned out to be no good. Hs., however, will be here at the end… | ||
| img005 | Carburetter noise issues and proposing using the crankcase as a silencer. | ||
| View original record | ORIGINAL: TWIN CARBS To R. From Hs/Rn. c.c. to Sd. Wox. c.c. to Da. E. c.c. to Ry. Hs/Rn.1/MJ.20.12.30. X.7080. X.5080. CARBURETTER NOISES. we now have the twin carburetters running. Naturally, in… | ||
| img006 | Comparing the test performance of a Delco Remy ignition coil against a standard and a Lucas coil. | ||
| View original record | To R. from EFC. c. Sg. c. EV. c. Wor. E. ORIGINAL EFC1/AD24.12.30. X.4284. DELCO REMY IGNITION COIL. In addition to the Delco Remy ignition distributor and contact breaker unit recently obtained and… | ||
| img007 | Tests conducted on different crankshaft dimensions for the 25 HP engine to determine critical speeds. | ||
| View original record | To R. From Hs/Rm. c. to SG. Wor. c. to Da. E. c. to Rg. By. ORIGINAL Hs/Rm/RT.15.1.31. X5010, CRANKSHAFT DIMENSIONS. 25 HP. It will be remembered that during a recent visit to West Wittering the… | ||
| img008 | Technical discussion on crankshaft pin design, balance weights, and their impact on critical speed and engine performance. | ||
| View original record | (2) Ha/Hs.2/KT.15.1.31. cont. how much pins of this size increase the bearing loads unless balance weights are fitted. This trouble did not occur on the smaller pin crankshaft when run at the same… | ||
| img009 | Expressing dissatisfaction with the progress of the single-cylinder compression-ignition engine and outlining a new design approach. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Mor. c. to Rg. E. c. to Sy. Hs.3/WJ.19.1.31. x4433, COMPRESSION IGNITION ENGINE. We are not satisfied, and we are certain the Air Ministry are not satisfied, with the… | ||
| img010 | The characteristics and output performance of Lucas dynamos. | ||
| View original record | To:- R.R. From EFC C-S-S. C.-M.O'F.,P-H., C-PH. C.S.H.(8) RECEIVED 5 FEB 1931 ORIGINAL APCS/ADS.2.31. X.6100. CHARACTERISTICS AND OUTPUT PERFORMANCE OF LUCAS DYNAMOS. This report is the result of… | ||
| img011 | Design and performance of Lucas E.575 dynamos and their winding configurations. | ||
| View original record | -2- EPC3/ATB.2.31 contd. It will be remembered that the Lucas E.575 dynamos which used to be standard on the Silver Ghost before we adopted our own make of machine for the Phantom, were arranged in… | ||
| img012 | Comparison of dynamo output curves and performance characteristics between different models. | ||
| View original record | -3- APC2/AHS.2.31 contd. principle to too great a degree has led us into troubles in other ways. We now believe we can obtain a very similar result without the loss of cutting in speed. As has already… | ||
| img013 | Comparison of weight and performance output between a Lucas machine and the company's own machine. | ||
| View original record | EWC3/ADS.2.31 contd. -4- This curve has been reproduced upon one of our 40/50 forms and curves from our own 40/50 machines have been added (dotted) for direct comparison. A blue print of this set of… | ||
| img014 | Concerns with a new shock absorber design with hand control, suggesting modifications using 'Delco' features to reduce cost. | ||
| View original record | To Da. From Hs. c. to Wor. ORIGINAL Hs.ll/KT.6.2.31. X.35 SHOCK ABSORBERS. We are rather concerned by the fact that the new design of shock absorbers is tied up with a hand control from the dashboard.… | ||
| img015 | Issues with current shock absorbers and proposals for a new design. | ||
| View original record | To R. From Hs. c. Sg. Wor. K. c. Da. By. X. 235. X. 7520. X. 5520. SHOCK ABSORBERS. We are not satisfied with the present position of shock absorbers, although we can look forward to our new design… | ||
| img016 | Issues with front shock absorbers on the Phantom II model, including design changes and customer complaints. | ||
| View original record | -2- The front shock absorber on the P.II. unfortunately does not lend itself easily to fit the split piston. I hold a view that on any future design we ought to have one type of shock absorber only… | ||
| img017 | Comparison and potential testing of a Lucas dynamo against an in-house model. | ||
| View original record | To E. from EFC. Hs. X.6100. Lucas Dynamo. ORIGINAL EFCL/AD9.2.31. RECEIVED 1931 FEB 9 We have received your Z8/M7.2.31. Probably at the time of writing your note you had not received our report… | ||
| img018 | Centralised chassis lubrication systems, comparing an ordinary coil of pipe with a flexible tube system from Messrs. Luvax. | ||
| View original record | To DA. From Hs/Rm. Hs/Rn.2/MJ.10.2.31. CENTRALISED CHASSIS LUBRICATION. X3806. With reference to Da.2/M7.2.31. The connection between the chassis and the axle of which we have the most experience and… | ||
| img019 | Outlining a programme for improving hydraulic dampers and front axle control on the Phantom II model. | ||
| View original record | To Da. From Hs/Rn. c. to E. c. to Sg. c. to Wor. ORIGINAL Hs/Rn.1/WJ.12.2.31. X235 HYDRAULIC DAMPERS & FRONT AXLE CONTROL. We note from R.1/M7.2.31 that R. is in agreement with putting a split piston… | ||
| img020 | Continued discussion on damper designs for the 25 HP and Phantom II models, including proposals for future improvements. | ||
| View original record | -2- Hs/ML.12.2.31.Cont'd. The ball end at the top of the torque control allowing three or four degrees spring controlled movement to take care of the quarreling occasioned by the short arm. We think… | ||
| img021 | Design improvements for shock dampers to reduce noise and wear. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Wor. E. c. to Ds. Hdy. RHC. c. to HY. ORIGINAL Hs/Rm.1/KT.1C.2.31. SHOCK DAMPERS. X-35 With reference to R.2/M.10.2.31., attached is a sketch of a damper which we think… | ||
| img022 | Effects of piston inertia torque on engine roughness for various cylinder configurations. | ||
| View original record | ORIGINAL. To R. From Hs/Gry. c. to Sg. c. to Br. c. to Ev. Hs/Gry.1/MJ.17.2.32. x634 PISTON INERTIA TORQUE. EFFECT OF ENGINE TYPE. We have found graphically the magnitude and frequency of the… | ||
| img023 | Experiments to reduce engine vibration and booms by modifying flywheels on the 25 HP and Phantom II models. | ||
| View original record | To R. From Hs/Gry. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL Hs/Gry.2/MJ.17.2.31. X634. FLYWHEELS. Our experiments to reduce engine vibration and booms caused by the flywheel have consisted of… | ||
| img024 | Flywheel design improvements and bearing tests to reduce engine roughness and vibration on various models. | ||
| View original record | -2- Hs/Grv.2/HJ.17.2.31.Cont. The other light flywheel designed by W.W. (L.E.C. 2830) is a great improvement by raising the period 500 r.p.m. (both on the road and on the test bed). This flywheel has… | ||
| img025 | Note comparing local inertia torques and crankshaft stiffness between 8-cylinder and 6-cylinder engines. | ||
| View original record | -2- Hs/TGV.1/ML.17.8.38.Cont'd. It should be added that local inertia torques in 8 cyl. engines are high as in the 6 cyl. engine, but 8 cyl. crankshafts are always stiffer than 6 cyl. ones for the… | ||
| img026 | Monthly report on customer complaints regarding booming, vibrations, brake squeaks, and shock dampers. | ||
| View original record | ORIGINAL To R. From Hs/GMH. c. to Wor. Sg. c. to By. Da. c. to R. Hd. c. to EP. Mx. Ha/GMH.2/KT.18.2.3 x4117. CUSTOMER'S COMPLAINTS MONTHLY REPORT. Item (1a) Booming and Vibrations. 25HP and Phantoms.… | ||
| img027 | Technical report on issues and improvements for springing, couplings, steering, and clutches. | ||
| View original record | -2- the split piston and solid lever, similar as fitted to the Lovejoy damper are being carried out with a view of fitting them to the present damper. Item (3) Springing. Rm. and Ltd. have been… | ||
| img028 | Customer complaints and proposed solutions for exhaust, slipper drive, and overheating issues. | ||
| View original record | -3- results and no recurrent complaint has been received after the fitting of same. Minor complaints still for some time be received as it is not intended to change the material on all existing cars.… | ||
| img029 | Service improvements and ongoing tests for components including the ignition coil, servo, rear axle, and starter motor. | ||
| View original record | -4- He/C/21.2.KT.18.2.32.Ct. We must get some means of ventilating the 20HP bonnet that can beused more generally. Item (10) Ignition Coils. The improved design of ignition coil is giving satisfactory… | ||
| img030 | Customer complaints and subsequent modifications on various vehicle components, including Phantom I and II models. | ||
| View original record | -5- isfactory. Phantom II complaints are generally due to the excess of oil getting on to the commutator and in the dash pot. The lubrication system has received attention by the D.O. Item (16) Petrol… | ||
| img031 | Failures and modifications for various vehicle components. | ||
| View original record | -6- Item (22) Battery Box Suspension. The last quarterly report is rather misleading with the above complaint. The depots have been instructed to fit the strengthened bracket to existing cars to… | ||
| img032 | Status report addressing issues with gearbox oil leaks, magneto wires, water pump drives, and engine water leaks. | ||
| View original record | -7- Hs/GWH.R/HT.18.2.31. Ch. any serious oil leaks. The depots have been instructed how to deal with axles in service. Item (29) Gearbox Oil Leaks. Depot sheets issued deal with this complaint.… | ||
| img033 | Trial report on the performance and silence of a Maybach car's 4-speed gearbox in Berlin. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Wor. c. to Dr. R. Hy. ORIGINAL Hs/Rm.17/KT.2.3.31. X3531. X2200. TRIAL OF MAYBACH CAR. BERLIN. We tried two of the Maybach cars in company with Dr. Maybach. The only… | ||
| img034 | Performance and handling review covering the ease of gear change, engine, steering, and brakes of a vehicle. | ||
| View original record | -2- (2) Ease of Change. Changing is quite simple. The box suffered from none of the defects that we have run into with a neutral position. The clicking noise can be practically eliminated with the… | ||
| img035 | Summary of recommendations regarding the potential purchase of a Maybach car or gearbox for testing. | ||
| View original record | -3- Suspension. This has no particular merit. SUMMARY. We should have chosen 26-XX. the trials car at Berlin in preference to the Maybach from the point of view of silence and performance had we been… | ||
| img036 | Modifications to existing Phantom II hydraulic rear dampers to resolve known issues and discussing future damper development. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Wor. c. to DA/HDY. By c. to E. Hs/Rm.7/KT.4.S.31. ORIGINAL X=35. HYDRAULIC DAMPERS. With reference to R.1/M.25.2.31. We make the following suggestions for immediate… | ||
| img037 | Proposed piston damper system and its potential for production. | ||
| View original record | - 2 - fully explored its virtues. We may find the remote control too good to neglect. It must be remembered that Springfield have no complaints as to the ride they can get with the existing dampers,… | ||
| img038 | High-speed braking tests and the performance of adjustable hydraulic shock absorbers. | ||
| View original record | To. R. From Hs/Rn. c. to Sg. Wor. c. to E. Da. c. to HY. ORIGINAL Hs/Rn.3/MJ.6.3.31. HYDRAULIC SHOCK ABSORBERS. X.235. X.4612. We have been doing some high speed braking tests with the ribbed brake… | ||
| img039 | Development, testing and issues with a new single-line petrol gauge for the Phantom II model. | ||
| View original record | To Da/Ev. From Hs/Rm. c. to Sg. ORIGINAL Hs/Rm.3/MJ.9.3.31. X4038 X7460 V4531 REAR END OF PHANTOM 11. We agree that we have been at fault in not giving you the result of road tests on the single line… | ||
| img040 | Scheme to incorporate a Warner synchronising mechanism into the Japan III gearbox. | ||
| View original record | ORIGINAL To Da. From Hs/Rm. Hs/Rm.l/MJ.14.3.31. X5310. We got BY. to go over the scheme for the Japan 111 gearbox to see if there was room in the box to incorporate the new Warner Synchronising… | ||
| img041 | Gearbox crash related to the Maybach change gear vacuum control system. | ||
| View original record | ORIGINAL To Da/Hdy. From Hs/Rm. Hs/Rm.3/MJ.16.3.31. x2200 MAYBACH CHANGE GEAR VACUUM CONTROL. With reference to Da/Hdyl/M14.3.31. We agree that by the combination of circumstances that you mention, it… | ||
| img042 | The new Bentley six-cylinder four-litre engine featuring a Ricardo patent head and its performance characteristics. | ||
| View original record | To R. From Hs. c. to Sg. c. to Wor. c. to E. ORIGINAL Hs.2/MJ.19.3.31. X3805 CAR ENGINES. The new Bentley six cylinder four litre engine is fitted with the latest Ricardo patent head. A sketch of this… | ||
| img043 | Cross-section diagram of a Ricardo patent cylinder head. | ||
| View original record | RICARDO PATENT CYL. HEAD. LARGE INLET VALVE SPARK PLUG IN CR OF HEAD CLCE BETWEEN PISTON & HEAD ONLY THICKNESS OF GASKET SMALLER EXH VALVE ROYCE LTD EXPT ROOM, 19 MAR 31 DERBY | ||
| img044 | Experimental results for reducing engine booming in Phantom II & 25 HP cars, focusing on engine and mounting modifications. | ||
| View original record | To R. From Hs/Rm. c. to SG. wor. c. to K. Da. c. to Ey. BOOMING CARS P.II & 25 HP. Before answering the questions in R.2/M.13.3.31. we should like to tabulate some of the results we have so far… | ||
| img045 | Analysis of different engine mounting systems and their effect on issues like booming, steering shocks, and jellying on various car models. | ||
| View original record | - 2 - HS/MS.3/KT.21.3.31.cont really very free from this complaint. Therefore experimentally we say there is no reason why booming 25 HP. cars should exist. Unfortunately the design of the rear… | ||
| img046 | Continued report on chassis booming, comparing engine mounting, steering, and body differences between Phantom I and Phantom II models. | ||
| View original record | - 3 - of these combinations. (b) Though vibration in the front seats is reduced when the central rear engine support is mounted on rubber, booms are not affected. We have confirmed this result some… | ||
| img047 | Eliminating body 'boom' by adjusting scuttles, engine feet, and other components on different body types. | ||
| View original record | - 4 - HS/HWS.3/KT.21.3.31.cont. chassis. However, as the following results shew, it would be quite possible to change a body from one chassis to another and unconsciously alter the conditions of… | ||
| img048 | Continuation of a report discussing and comparing vehicle issues like flywheel whirling and engine mounting. | ||
| View original record | - 5 - Hm.3/HT.21.3.31.cont. (3) We do not believe Hispanos are any better than we are from what Coachbuilders say. We cannot judge Bentleys on one car and are trying to obtain further information. (4)… | ||
| img049 | Summary of experimental tests carried out on power units, engine mountings, and chassis features. | ||
| View original record | Experimental Tests Carried Out. Power Unit. (1) Various dia. Crankshafts. (2) Various crank dampers. (3) Balance weights. (4) Front flywheel plate only. (5) Complete flywheel with aluminium rear half.… | ||
| img050 | Tests and observations on vehicle vibration and 'boom' issues, comparing Phantom I and Phantom II models. | ||
| View original record | - 2 - (2) Steering column isolated. With the rear engine feet removed this has sometimes a marked effect. (3) Frame side members damped by jacks at different points, also by lead weights. No… | ||
| img051 | The tests of an American gearbox fitted with a spool gear third speed, comparing its silence to other designs. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to Da. E. c. to By. Hs.3/WJ.19.3.31. X3720. X2061. TESTS ON AMERICAN GEARBOX FITTED WITH SPOOL GEAR THIRD SPEED. --------------------- You will remember that Oy.… | ||
| img052 | Experiments to improve fuel distribution with a downdraught carburettor. | ||
| View original record | To R. From Hs/Lov. c. to Sg. SOR. c. to F. Da. c. to Ey. Hs/Lov.1/KT.2.4.31. x7080 x5080 DISTRIBUTION WITH DOWNDRAUGHT CARBURETTER As previously reported the distribution with the Downdraught… | ||
| img053 | Monthly report detailing customer complaints about vehicle faults and the status of fixes. | ||
| View original record | To R. From Hs/GMH. c. to Wor. Sg. c. to By. Ds. c. to E. Hd. c. to EP. Mx. ORIGINAL CUSTOMER'S COMPLAINTS MONTHLY REPORT. We are not at all happy in reviewing the complaints that are still being dealt… | ||
| img054 | Progress report on various vehicle components and issues. | ||
| View original record | - 2 - has been considerably decreased. Expl. work by Whn. and Lid. is still being carried out to obtain conditions suitable for all purposes. Very good results have been obtained with the 25 HP.… | ||
| img055 | Issues and modifications for various vehicle components including servos, telegauges, and petrol tanks. | ||
| View original record | - 3 - HS/GWH.1/KT.8.4.31.cont. the fitting of the new coil. Item (11). Servo. The inefficiency of servos is being dealt with by depots by the fitting of cotton duck washers replacing Halo. The… | ||
| img056 | Technical report detailing issues and modifications for components like radiators, fan pulleys, oil pumps, and engines. | ||
| View original record | - 4 - Me/GWH.1/KT.8.4.31.cont. Item (17). Radiator Leaks. We have nothing further to report other than considerable improvement in the soldering has been made by the works. Item (18). Fan Pulleys. The… | ||
| img057 | Recurring technical issues and their resolutions for various car components. | ||
| View original record | (5) HS/GELL/KT.8.4.31.conf These troubles are being dealt with and should quickly disappear. The Expl. Dept are carrying out tests with stainless steel valve seat to overcome flooding. This will be… | ||
| img058 | Water pump fabric drive and engine water leaks from cylinders. | ||
| View original record | - 6 - Ha/GWH.1/KT.8.4.31.cont. Item (33). Water Pump Fabric Drive. 20/25 HP. We are satisfied with the oil protection shield for the fabric drive and instructions will be sent to the depots. Item… | ||
| img059 | Trial run of a Buick car fitted with a synchro mesh gear device. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL EASY CHANGE GEAR. X.523. X.3317. Yesterday we had a trial run on a Buick car fitted with a synchro mesh device between the second and… | ||
| img060 | Comparing a 6-cylinder Buick's crankcase ventilation system to their own, highlighting its effectiveness in preventing oil smells. | ||
| View original record | To E. From Hs/Rm. Hs/Rm.11/KT.22.4.31. X3317 We have recently tried one of the latest 6 cylinder Buick cars. The synchronous mesh gear fitted to this car worked remarkable well. An interesting feature… | ||
| img061 | Investigations into various easy change gear systems, including Voisin, Graham Paige, and Buick synchromesh. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL Hs./MJ.2.5.31. X.523. X.2061. EASY CHANGE GEAR. On our return from W.S. we called at London to see whether we could try a Voisin car with… | ||
| img062 | Comparing the Kismet '31 Tyre Tester to the Schrader gauge and recommending it for standardisation. | ||
| View original record | To R. From Hs/Lid. c. to Sg. Hcr. c. to E. Da. c. to By. Roy. Hs/Lid.6/KT.4.5.31. X4552. KISMET '31 TYRE TESTER. We have recently had submitted to us for test purposes a Kismet '31 Tyre Tester. The… | ||
| img063 | Referencing a sketch and description of Voisin gear found in a 1930 Paris Show report. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wor. c. to K. Da. c. to By. Hs.1/MJ.5.5.31. X2061. VOISIN GEAR. We find that a sketch of this gear and a description was contained in Rm's. Paris Show report 1930… | ||
| img064 | Petrol pump with a fabric diaphragm, comparing it to a similar A.C. pump. | ||
| View original record | ORIGINAL To R. From Hs. S. to Sg. Wor. c. to E. By. Hs.7/MJ.5.5.31. X.2677. PETROL PUMP. We are sending you herewith a description of another petrol pump which has the fabric like the A.C. the… | ||
| img065 | The function of carburettor float chambers during fast cornering and tilt. | ||
| View original record | To R. From Ha/Lov. c. to Sg. NOR. c. to Rg. E. c. to Hy. ORIGINAL Ha/Lov.1/KT.7.5.31. x1053. x4529. CAR CARBURETTERS - FLOAT CHAMBERS. We have looked at several makes of carburettors to see how they… | ||
| img066 | Carburetter design, including diffuser flooding, accelerating pumps, and future development for supercharged aero engines. | ||
| View original record | - 2 - of the needle valve and so allowing a straight passage of fuel through the carburetter. Slight diffuser flooding under certain conditions probably takes place on a good many carburetters, but we… | ||
| img067 | Reviewing the position of road springs and the effects of fitting low-rating springs on riding quality, steering, and braking. | ||
| View original record | To F. From Hs/An. c. to Sg. Wor. c. to Da. R. c. to Wy. P. Hs/RM.3/RT.13.5.31. X7410. X5410. ROAD SPRINGS. We think it may be advisable to review the present position of road springs. We are now in… | ||
| img068 | The maximum stress in spring leaves and a summary of spring standardisation for the 25 HP and 40/50 models. | ||
| View original record | - 2 - Ha/Rn./KT.13.5.31.cont'd. (3) Maximum Stress in the spring leaves. In spite of greatly reducing the top leaf thickness of all springs (the 25 HP. front is now only .225" thick) and making the… | ||
| img069 | Investigation and proposed solution for Phantom rear brake groans. | ||
| View original record | To R. From Hs/GWH. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL x7360. Re. Phantom Rear Brake Groans. We have found, during our investigations of the rear foot brake groans, that the groans can be… | ||
| img070 | Radiator tests conducted at Brooklands, comparing hexagonal and square tube designs for efficiency and resistance. | ||
| View original record | To R. From Hs/Rn. c. to SG. Wor. c. to Da. E. c. to EY. Hs/Rn.8/KT.19.5.31. Handwritten notes: X7250. X5250. X766. X788. RADIATOR TESTS. BROOKLANDS. We have now completed our tests on the two… | ||
| img071 | Comparison of radiator and bonnet efficiencies, including weight, ventilation, and cost considerations. | ||
| View original record | - 2 - we cannot get the English manufacturers to produce hexagon tubes as cheaply as we can buy them in the States, but we have at least an alternative source of supply with which to threaten them. We… | ||
| img072 | Radiator efficiency improvements and the requirement for a wind tunnel for further testing. | ||
| View original record | - 3 - Hs/Rm.S/KT.19.5.31.cont to add as additional efficiency gained since 1930. (1) New Anti Spill radiator cap. (2) Radiator height increased by 1" (area 4%). With regard to further development of… | ||
| img073 | Report on Delco Shock Absorbers, shimmy shackles, and synchro mesh gearboxes. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL Re.4/MJ.21.5.31. X433 Oy's file.. We attach herewith copy of a letter we have received from Oy., in reply to a letter which we sent him… | ||
| img074 | Tests on various valve lifts and camshafts for 25 HP and 40/50 engines. | ||
| View original record | To E. From Hs/Rm. Hs/Rm.l/KT.22.5.31. X.5771. X.7771. POWER OUTPUT 25 HP. AND 40/50. We are sending you details of the various valve lifts we are trying. The cams we have are - (1) The old short… | ||
| img075 | The effect of balance weights on flywheel wobble in Phantom II and 25 HP models. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg.. Wor. c. to E. Da. c. to By. Hs.5/MJ.23.5.31. x634 x5010 x7010 BALANCE WEIGHTS P.2 & 25 HP. Effect of Balance Weights on Flywheel Wobble. PHANTOM 11. On Phantom 11… | ||
| img076 | Flywheel balance weight testing and its effect on flywheel wobble. | ||
| View original record | -2- Hs.5/MJ.23.5.31.Cont'd. then removed all balance weights. The flywheel period was then definitely worse and was spread over a wider range of speed. We then fitted the 6 balance weights. With these… | ||
| img077 | Customer complaints about overheating and recommending changes to radiator tube design. | ||
| View original record | COPY. To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. PN. Hs.8/MJ.28.5.31. RADIATORS. E.7250. X.766. X.5250. X.4607. We are most anxious to overcome entirely overheating complaints from… | ||
| img078 | Query on American engine design, gearboxes, and manufacturing methods. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. Hs.ll/WJ.29.5.31. By's file. AMERICAN PRACTICE. Some time ago I wrote to Oy, saying that as they had produced an 8 cyl., 12 cyl., and 16… | ||
| img079 | Development and testing of a double valve for hydraulic shock absorbers. | ||
| View original record | To R. From Hs/Rn. c. to Sg. Wor. c. to Da. E. c. to Ey. Hs/Rn.4/RT.1.6.31. 8235. HYDRAULIC SHOCK ABSORBERS. We have now reached a stage in the development of the double valve where we can say that it… | ||
| img080 | Schematic diagram of a Double Piston Damper with various valve configurations and component details. | ||
| View original record | Hs 369 1-6-31 DAS SCHEMES L.P.R SURGE CHAMBERED OUT VALVE DIA REDUCED SPRING CHAMBER AIR RELEASE MAX .005" RADIAL CLEARANCE RR [Stamp] ROLLS ROYCE LIMITED [Stamp] PRINT ... [Stamp] 4 JUN 31 [Stamp]… | ||
| img081 | Investigation into the cause and rectification of noise from a double piston damper. | ||
| View original record | N.SCH.3190 & 5. DOUBLE PISTON DAMPER. Before fitting it on to test rig (during the filling process) it was noticed that the loads were exceptionally heavy, there was no air release and that when the… | ||
| img082 | Test report on diagnosing and rectifying a noise issue in a valve through various modifications. | ||
| View original record | - 2 - When the hole in the valve was replugged the noise was again produced, also the diagrams remained "in the air". The hole was then re-opened and an additional hole .025" drilled in the L.P.… | ||
| img083 | Test report on high pressure valve performance, noise, and modifications including different springs, designs, and valve lifts. | ||
| View original record | - 3 - By increasing the radial clearance to .010" and utilising the .025" dia. H.P. valve hole, the damper was silent, and the diagrams were more rational. The high pressure diagram shewed a distinct… | ||
| img084 | Tests conducted on valve and damper springs, including modifications to reduce noise and improve performance. | ||
| View original record | - 4 - Another spring giving 8 lb. initial load, and 200 lb/in. capable of being fitted with the sylphon was tried. The most satisfactory results so far obtained were with this 200 lb/in. in… | ||
| img085 | Standardisation of P.2 & 25 HP exhaust tail pipes. | ||
| View original record | ORIGINAL To R. From Hs/GWH. c. to Sg. Vor. c. to E. Da. c. to By. Hs/GWH.1/WJ.2.6.31. P.2 & 25 HP. EXHAUST TAIL PIPES. X.7230. X.5230. There is a general demand by customers to have the exhaust… | ||
| img086 | Road test performance comparison of a Humber Snipe Fabric saloon against an average 20/25 HP model, covering hill climbs and acceleration. | ||
| View original record | To R. From Hs/Lid. c. to Sg. Wor. c. to E. Da. c. to Ey. Hs/Lid.3/KT.2.6.31. X1525. HUMBER SNIPE. We have carried out a short road test on a Humber Snipe Fabric saloon. The car had 6,050 miles to its… | ||
| img087 | Performance and handling evaluation report of a vehicle, covering speed, engine, suspension, braking, and gearbox. | ||
| View original record | - 2 - The speedometer was checked and found to be correct at 20 and 30 m.p.h., and 3% fast at 40 and 50 m.p.h. All the performance speed figures given are by speedometer. The low speed performance is… | ||
| img088 | Engine mounting modifications to reduce 'booming' on the 40/50 model. | ||
| View original record | To R. From Hs/Rn. c. to Sg. c. to WOr. ORIGINAL Hs/Rn.1/MJ.4.12.30. X181. BOOMING 40/50. You will recollect that we have reported a marked improvement in 'booming' on the 40/50 by mounting the engine… | ||
| img089 | Engine boom issues in 40/50 & 25 HP models, detailing tests on balanced crankshafts and flywheels. | ||
| View original record | To R. From Hs/Rm. c. to Sg. c. to DA. E. c. to EY. ORIGINAL ENGINE BOOMS 40/50 & 25 HP. We have been running chassis 24-EX. on the road with a balanced crankshaft and the engine single point mounted… | ||
| img090 | Review of brake shoe design and lining areas for 40/50 and 25 HP models, with a comparison to competitor vehicles. | ||
| View original record | To R. from Hs/Bm. c. Sg. c. Wor. Da. c. E. Ry. Hs/Tml/AD16.12.30. X. 7930. X. 5360. X. 5930. X. 5420. X. 7360. X. 7420. 40/50 and 25 HP. BRAKES. Since brake shoe design is under consideration, we have… | ||
| img091 | Table of dimensions for servo-operated brakes across various models. | ||
| View original record | TITLE: DIMENSIONS OF SERVO OPERATED BRAKES TABLE HEADERS: TYPE | FRONT BRAKES - ARC OF CONTACT OF EACH BRAKE STRAP LENGTH | FRONT BRAKES - WIDTH OF SHOE | FRONT BRAKES - DIA. OF DRUM | REAR BRAKES -… | ||
| img092 | Table of particulars for servo-operated brakes across various car models. | ||
| View original record | PARTICULARS OF SERVO OPERATED BRAKES TYPE OF CAR FRONT BRAKES TOTAL AREA OF FRICTION SURFACE BRAKE AREA PER TON LOAD FRICTION MATERIAL REAR BRAKES TOTAL AREA OF FRICTION SURFACE BRAKE AREA PER TON… | ||
| img093 | Problem of 'booming' in car bodies and the collaborative efforts to resolve it. | ||
| View original record | To EV. From Hs/Rn. c. to C. c. to EP. c. to PN. Hs/Rn. M.6/MJ.23.12.30. x634 BOOMING. We have been concentrating our energies on 'booming' for some time past. We were asked to say what we did to… | ||
| img094 | Preliminary test report on a new twin choke carburettor for the Phantom II model, detailing performance and issues. | ||
| View original record | To R. From HS/ACL. c. to Sr. Wor. c. to E. Da. c. to Hy. HS/ACL/RMJ.24.12.30. x7080. TWIN CHOKE CARBURETTOR FOR PHANTOM II. We have made some preliminary tests with the new twin choke carburetter on… | ||
| img095 | Engine vibrations, flywheel boom, and connecting rod length tests on 40/50 engines. | ||
| View original record | To R. From Hs/Rn. c. to SG. Wor. c. to Da. E. c. to HY. ORIGINAL ENGINE VIBRATIONS. Tests have been carried out on the 40/50 engine reported in Hs/Gryl/MJ.7.1.31 which convince us that the flywheel is… | ||
| img096 | Standardisation of Chassis Parts document for Adjustable Pedal Stems, P.11. | ||
| View original record | RR 755 (10H) (3-7-30) BM. 6/2571. ORIGINAL COMPLETED 9.1.31. STANDARDISATION OF CHASSIS PARTS. Date 18.10.30. Description of Parts. ADJUSTABLE PEDAL STEMS. P.11. Origin. To enable the pedal position… | ||
| img097 | Standardisation of parts form detailing costs for new jigs and tools, and tracking approvals. | ||
| View original record | STANDARDISATION of PARTS Date: 27.10.30 No. X Drawing No. DC/S.G.15822/SS.3 The number of the first chassis on which the new part will be fitted. Not decided. Date when chassis will be handed to Test.… | ||
| img098 | Forwarding a note from Mx, asking how to proceed with testing an increased bearing area. | ||
| View original record | ORIGINAL To E. From Hs/Rm. Hs/Rm.1/MJ.14.1.31. X-7040. Attached is a copy of a note from Mx. If you would consider giving us more bearing area, how would you like us to test it? Hs/Rm. Att: copy of… | ||
| img099 | Complaints about the Phantom II piston and proposing an increase in its length for improved performance. | ||
| View original record | Hs. BY. Wor. From Mx. COPY. Mx.8/T5.1.31. PHANTOM ll PISTON - QUARTERLY COMPLAINTS. While we have considerably reduced the number of complaints due to piston trouble, and with the introduction of… | ||
| img100 | The difficulties of starting the Phantom II on magneto ignition, recommending a switch to a twin battery system. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to Da. E. c. to By. X 6096 X 6098 PHANTOM II MAGNETO & BATTERY IGNITION. One of the points raised in Springfield was that as they had been supplying cars for a number… | ||
| img101 | Comparison of magneto and battery ignition systems, detailing the difficulties of starting a Phantom II with a magneto. | ||
| View original record | He/AIL.14.1.31. MAGNETO IGNITION ON PHANTOM II. X 699 The one argument for the battery and magneto ignition when compared with twin battery ignitions is that it should be possible to run the car if… | ||
| img102 | Warning about potential dynamo damage when the car battery is run down or disconnected. | ||
| View original record | -2- If the battery is run down to an extent when it is not capable of operating the starter motor, there is invariably sufficient current in it to operate the battery ignition to enable the car to be… | ||
| img103 | Standardisation of chassis parts concerning the alteration of the Phantom II exhaust system to the 20/25 scheme. | ||
| View original record | RR 755 (10H) (3-7-30) BM. 6/2571. COMPLETED 21.1.31. STANDARDISATION of CHASSIS PARTS. Description of Parts. PHANTOM II EXHAUST SYSTEM ALTERED TO 20/25 SCHEME. Date 11.12.30. X No. 7230. Drawing No.… | ||
| img104 | Form for the standardization of chassis parts. | ||
| View original record | STANDARDISATION OF CHASSIS PARTS Date 11.12.30. Drawing No. X 4830. Part No. Description of Parts. The number of the first chassis on which the new part will be fitted. When available Date when… | ||
| img105 | The failure of a Phantom II low inertia slipper wheel during testing. | ||
| View original record | ORIGINAL To R. From Hs/Rm. c. to Sg. Wor. c. to Da. E. c. to Rg. By. Hs/Rm.1/KT.21.1.31. X634. P.II. LOW INERTIA SLIPPER WHEEL Whilst carrying out the test to determine the critical speed on the… | ||
| img106 | Blueprint of a P.II. Low Inertia Crankshaft Damper. | ||
| View original record | P.II. Low Inertia Crankshaft Damper, PLATE .075 THICK., A, X, Y | ||
| img107 | Standardisation of an oil drain plug in the side of the engine case. | ||
| View original record | RR 785 (10H) (3-7-30) BM. 6/2571. COMPLETED 28.1.31. STANDARDISATION of CHASSIS PARTS. Description of Parts. OIL DRAIN PLUG IN SIDE OF ENGINE CASE. Origin. Improved accessibility for L.H. chassis.… | ||
| img108 | Standardisation form detailing the cost and schedule for fitting a new part to a chassis. | ||
| View original record | COMPLETED 28.1.31. STANDARDISATION OF CHASSIS PARTS from E.W.H The number of the first chassis on which the new part will be fitted. N.2. Series. Date when chassis will be handed to test. ----- Cost… | ||
| img109 | Continued tests and modifications to the Phantom II twin choke carburettors. | ||
| View original record | To R. From Hs/Lov. c. to SG. Wor. c. to E. Da. c. to By. Hs/Lov.1/MJ.28.1.31. X7080. PHANTOM 11 TWIN CHOKE CARBURETTERS. Tests have been continued on the twin choke carburetter, and we have corrected… | ||
| img110 | The successful initial testing and adjustment of a new aero carburetter scheme. | ||
| View original record | -2- can with our aero carburetter scheme. Our aero carburetter scheme of variable position discharge orifice in relation to throttle edge, is very good and we have applied it to these carburetters. We… | ||
| img111 | Performance graph comparing twin carburettor systems with a standard P1 carburettor and induction system. | ||
| View original record | TWIN R.R-CARBS AND INDUCTION SYSTEM COMPARISON WITH STANDARD P1 CARBURETTOR AND INDUCTION SYSTEM TEST BED EXHAUST SYSTEM V1023 BHP RPM MEP 120 110 100 90 80 70 60 50 40 1000 1500 2000 2500 3000 TWIN… | ||
| img112 | Tests of lower rating front and rear road springs for the Phantom II car. | ||
| View original record | To R. From Hs/Lid. c. to Sg. WCR. c. to Dn. HY. c. to EP. Hd. c. to GNH. ORIGINAL x7410 PHANTOM II SPRINGING. Further tests have been carried out on various P.II cars using lower rating front and rear… | ||
| img113 | Vehicle suspension testing, detailing modifications to springs and the use of weights to improve ride comfort and reduce frame jellying. | ||
| View original record | -2- safely increase the deflection for load by approx. 50% on the front springs and 25% on the rear. i.e. we use front springs with an initial camber of 4.5" and rear 10.25". The alteration to the… | ||
| img114 | Suspension tests addressing body distortion, frame distortion, and the effects of shock absorbers and springs. | ||
| View original record | (3) and fixed to the centre of the dumbell bar. This had no effect at all, the body distortion and jiggling was as bad as with no weights at all. Secondly the two weights were clamped one on each… | ||
| img115 | Customer complaints about vibrations and booms in Phantom II and 25 HP models. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to R. Da. c. to Ey. x694 PHANTOM II & 25 HP. VIBRATIONS & BOOMS. We feel that we have not given a sufficiently clear description of the vibrations and booms which… | ||
| img116 | Tests on engine mountings, clutch components, and torque reaction dampers to mitigate car booming and vibrations. | ||
| View original record | -2- Hs.3/AL.9.2.31.Contd. the test with the Diabolo feet because on a previous test we thought we had gained a definite advantage. We have recently tried the effect of making the rear half of the… | ||
| img117 | Engine vibration issues, flywheel wobble, and potential cures on 25 HP and other models. | ||
| View original record | -3- Hs.3/ML.9.2.31.Cont'd. mounting which allows the engine to move the dampers will be more effective, but we would need the inertia of the body to help. Torque reaction vibrations synchronise with… | ||
| img118 | Arranging wind tunnel tests on radiators with Boulton & Paull to address a complaint of boiling. | ||
| View original record | ORIGINAL To S. From Hs. c. to Sg. Wo r. c. to E. Da. c. to Ey. Hs. 1/16J.14.2.31. x766. PII COOLING. Re. Worst Features 40/50 P.II. Sg8/26.2.31. It will be seen by the above memo that the complaint of… | ||
| img119 | Testing and troubleshooting of 'booms and vibrations' on Phantom II cars, including modifications to engine mountings. | ||
| View original record | ORIGINAL 586X 34EX J5TEX To R. From Hs. c. to Sg. Wo. c. to E. Da. c. to Ey. PN. c. to EP. Mx. Hs.2/MJ.23.2.31. y634. x2924. PHANTOM II BOOMS & VIBRATIONS. EP. Mx. Rn. and Hs. met Sg. PN. and E. at… | ||
| img120 | Troubleshooting frame jellying and vibration issues using different engine mounting schemes. | ||
| View original record | -2- car free from booms. In the case of Mr. Davies we have a customer whom we cannot satisfy, but as we can make no improvement by giving him a new chassis which has been selected the conclusion has… | ||
| img121 | The performance and modifications of left-hand drive cars, including engine compression ratios and delivery schedules. | ||
| View original record | -3- H.S.2/H.J. 23.2.31. Contd. We have now left-hand cars completed and off tests ready for despatch. It was agreed that as regards item (1) Booms and Vibrations, we have no known cure to apply to… | ||
| img122 | Downdraught carburettor tests for the Phantom II. | ||
| View original record | To R. From Hs/Lov. c. to Sg. Wor. c. to Dn. By. ORIGINAL DOWNDRAUGHT CARBURETTER ON PHANTOM II. X7080. We have carried out several tests with the Downdraught Carburetter on Phantom II. The carburetter… | ||
| img123 | Comparing downdraught and standard carburettors and discussing power curve improvements via better distribution. | ||
| View original record | - 2 - Appended is a power curve comparing the Downdraught and std. carb. We think the power may be improved when we get better distribution. In looking at these power curves it must be remembered that… | ||
| img124 | The initial tests of Maybach dogs on the 14-EX vehicle, detailing issues with gear engagement. | ||
| View original record | To R. To Da/Hdy. From Hs/Lid. c. to Sg. Wor. c. to E. BY. ORIGINAL Hs/Lid.3/KT.26.2.31. X1100. MAYBACH DOGS (ON 14-EX). The first tests on the Maybach dogs on 14-EX were not very successful owing to -… | ||
| img125 | Transmission jerks and crashes during gear changes. | ||
| View original record | - 2 - transmission jerks (and accompanying crash) invariably occur when this is attempted when the 1st. motion shaft is turning at any speed but the merest crawl, this appears to be unavoidable if the… | ||
| img126 | Troubleshooting gearbox engagement issues, focusing on dog face angles and the preselector mechanism. | ||
| View original record | - 3 - Hs/Lid.3/KT.26.2.31.Cont. From the first tests on this car it is evident that we have a long way to go to achieve a reliable fool proof change. The two chief troubles are clicking, and engaging… | ||
| img127 | Required alterations to the 40/50 and 25 HP gearboxes, referencing Dr. Maybach's designs. | ||
| View original record | COPY. TO R. From Hs/Rn. Hs/Rn.14/KT.2.3.31. c. to Da. c. to By. X. 7310. c. to Sg. X. 5310. X. 523. R.R. EASY CHANGE SILENT GEARBOXES. ---------------------------------- In view of the information… | ||
| img128 | Cross-section diagram and gear ratio table for a Maybach transmission for large vehicles. | ||
| View original record | Engine end 41245 Section Through New Maybach Transmission for Large Motor Cars, Buses and Utility Vehicles Speed IV III II I Ia Reverse Reduction 1:1 1:1.5 1:2 1:3 1:4.5 1:4.5 Over gears Direct… | ||
| img129 | Discussion with Dr. Maybach concerning the design and operation of Maybach-type dog gearboxes. | ||
| View original record | ORIGINAL To R. From Hs/Hn. c. to Da/Hdy. Sg. c. to wor. E. Ev. Hs/Rn.9/KT.2.3.31. X3S31 X2200 MAYBACH DOGS. With reference to your Da/Hdy.1/20.2.31. We discussed with Dr. Maybach in Berlin the points… | ||
| img130 | Continued report on Maybach gearbox and clutch systems, including diagrams. | ||
| View original record | -2- Hs/RM.9/KT.2.3.31.cont. (6) It is always necessary to release the accelerator pedal on the Maybach cars we have tried, before the dogs can dis-engage and a change down be made. They therefore… | ||
| img131 | The preparation and modifications of car 27-EX for a visit to Le Canadel. | ||
| View original record | ORIGINAL To R. From Hs. c.c. to Sg. c.c. to Rg. c.c. to Da. C.329S Hs. Wor. E. By. Hs.6/MJ.3.3.31. X8992. VISIT TO LE CANADEL. We are preparing 27-EX. car so that it can go out to you at Le Canadel.… | ||
| img132 | Development of a 12-cylinder car and the decision to build their own engine. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to EV. Hs.1/MJ.4.3.31. X.3531. X.4024. 12 CYLINDER CAR. It will be seen from Rn's. report that except for the gearbox the Maybach car possesses… | ||
| img133 | Tests to investigate the cause of a 'boom' and vibration in the Phantom II model. | ||
| View original record | To R. From Hs. c. to SG. Wor. c. to E. Da. c. to Ry. P.2. BOOMS AND VIBRATIONS We consider that we have done enough tests now to be able to say definitely that on Phantom ll the flywheel is not the… | ||
| img134 | Tests to diagnose and resolve a 'boom' or vibration issue on Phantom I and Phantom II models. | ||
| View original record | -2- E.S.3/H.T.11.3.31.Cont'd. and towed the bare crankshaft with balance weights. This made no difference, the boom was still there slightly at the same speed. From other tests we have done it can be… | ||
| img135 | Investigation into 'body boom' issues on a Phantom II car, comparing crankshaft and balance weight configurations. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wor. c. to PN. By. c. to E. PHANTOM 11 BODY BOOMS. We have 27-EX. car running fitted with a new crankshaft with stiffer flange, flywheel with stiffened flange, and… | ||
| img136 | Preliminary tests of an Epicyclic Easy Change Gearbox with a vacuum controlled twin top change gear. | ||
| View original record | Copy To R. From Hs/Lid. c. to Sg. Nor. c. to E. Da. By. ORIGINAL Hs/Lid.4/KT.31.3.31. x7310 x52's EPICYCLIC EASY CHANGE GEARBOX. We have carried out some preliminary tests on the Epicyclic gearbox… | ||
| img137 | Gearbox issues, focusing on noise, complexity, and gear modifications. | ||
| View original record | (3) Hs/Id.4/KT.31.3.31.cont. (b) A big "clonk" from the toggle mechanism each time the gear is changed. (c) The combination of having a gear change by gear lever and from steering wheel is very… | ||
| img138 | Analysis of gearbox noise and gear change issues, particularly concerning Maybach dogs and epicyclic gears. | ||
| View original record | (2) two pairs of helicals are revolving more slowly for the same engine speed and make less noise, but the epicyclic noise counteracts this. The epicyclic third is very noisy under load much more… | ||
| img139 | Proposed measures to address excessive 'jellying' and body boom issues by testing modifications to engine feet, springs, and tyres. | ||
| View original record | ORIGINAL. To R. From Hs/Rm. c. to Sg. Nor. c. to K. Ds. c. to Wy. Fn. Hs/Rm./7/KT.2.4.31. x634. x457: BODY BOOMS P.II. with reference to R4/M.25.3.31. (1) Proposed Palliative Measures. We note that on… | ||
| img140 | Analysis of vehicle booming, radiator movement, and front end shake, with proposed solutions including a diamond engine mounting. | ||
| View original record | (2) pressures, these two features may accentuate the jellying produced by removing the rear feet. One of the Sales cars that we treated for booming, 129.GN. was as bad for radiator movement as any we… | ||
| img141 | Methods to reduce frame 'jellying' by modifying engine mounts and frame stiffness. | ||
| View original record | (3) Hs/Rm.7/KT.2.4.31 cont. (b) with front rubber mounted engine feet to assist. That this can be accomplished we believe because at the Berlin Show we noticed that the Maybach was almost entirely… | ||
| img142 | Noise issue with the Maybach jaws on a gearbox with an epicyclic third speed. | ||
| View original record | COPY. ORIGINAL To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to Ry. Hs.4/KT.2.4.31. X.523. X.2200. GEARBOX WITH EPICYCLIC THIRD SPEED. The distressing noise we have had from the Maybach jaws on this… | ||
| img143 | The road tests of a Phantom II twin choke carburetter fitted to car 22-EX. | ||
| View original record | To R. From Hs/Lov. c. to Sg. Gsr. c. to E. Da. c. to Hy. ORIGINAL PHANTOM II TWIN CHOKE CA BURCTTER TESTS ON CAR. We have now had some road tests with the twin choke carburetter with promising results… | ||
| img144 | Road tests of a twin carburetter, detailing fuel metering adjustments and performance on hill climbs. | ||
| View original record | (2) Hs/LoV.2/AT.2.4.31.cont. With regard to the metering we found on the road that it shewed a rich characteristic just above the change over position at full throttle and reached a normal mixture… | ||
| img145 | Progress report on carburettor and silencer testing, including notes on fuel consumption and ongoing development. | ||
| View original record | (3) Slow running and snap opening up are very good. A silencer is needed to bring it to the same degree of quietness as the std. carburetter, but in its present form it is not unduly noisy. It would… | ||
| img146 | Investigation into carburetter flooding and fuel starvation issues on a Phantom II during cornering. | ||
| View original record | ORIGINAL To R. From Hs/Lov. c. to SG. Nor. c. to E. Da. c. to HY. PHANTOM II. TWIN CHOKE CARBURETTERS. X7080. We pointed out in a previous report that we had experienced trouble with flooding when… | ||
| img147 | Technical memorandum discussing carburettor float design and fuel level compensation for the R. engine and Phantom II. | ||
| View original record | - 2 - HS/LoV.3/KT.17.4.31.cont Not quite the same on the R. engine because in a machine of this type - the a.s. - flat turns are seldom intentionally made, but in the car the turns are always flat.… | ||
| img148 | Diagram showing a fuel level issue in a P.II. Twin Choke Carburetter when tilted. | ||
| View original record | P.II. TWIN CHOKE CARBURETTER. NORMAL LEVEL. DIAGRAM SHEWING THAT IF INCLINATION EXCEEDS ABOUT 14° THERE IS NO RESERVE BUOYANCY OF FLOAT IN THE MOST FILLED FLOAT CHAMBER AND FLOATS. THEREFORE DROP AS… | ||
| img149 | Comparative performance tests between a Continental Phantom II and two Bentley models. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. PN. ORIGINAL Hs.1/MJ.17.4.31. x 3805. x 7120. COMPARATIVE TESTS WITH PII CONTINENTAL? BENTLEY CAR. Mr. Jack Barclay, one of our agents, had pointed… | ||
| img150 | Performance comparison report of cars 26-EX and 27-EX against various Bentley and Maybach models. | ||
| View original record | -2- 65 to 70 m.p.h. and after that the Bentley went right ahead. For road work 27-EX. would not be left very much by the 8 Litre Bentley. That is, although we may increase our axle ratio to obtain… | ||
| img151 | Production tests and investigations into 'booming' complaints on Phantom II cars. | ||
| View original record | To R. From Hs. c. to SG. Wor. c. to E. Da. c. to Ey. ORIGINAL Hs.1/NU.18.4.31. X634 PHANTOM II BOOMS. We do not know whether we have made it clear that on the production tests of Phantom II cars there… | ||
| img152 | Investigation into the cause of a 'boom' or vibration in Phantom II cars at specific engine speeds. | ||
| View original record | To R. From Hs/Gry. c. to SG. Wor. c. to E. Da. c. to Ry. ORIGINAL P.II BOOMS. We do not yet know why Phantom II cars boom at 2200 r.p.m. whereas no boom existed in Phantom I's. We are able to say that… | ||
| img153 | Analysis of vibration and 'boom' resonance frequency in Phantom II cars, investigating potential causes and cures. | ||
| View original record | - 2 - sets is 6600/minute. This frequency therefore appears to be a resonance frequency of Phantom II cars. While running at this speed on tran sets we held a microphone against various parts of the… | ||
| img154 | Customer complaints about booming noises and proposed modifications to the rear engine test and column support. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Mor. c. to E. Da. c. to My. ORIGINAL Hs/Rm. 2/KT.18.4.31. X.634. X.7005. We have about ½ doz. customers who have complained bitterly about booms, but we must do something… | ||
| img155 | Test report on Phantom II rear axle rebound movement and springing. | ||
| View original record | To R. From Hs/Lid. c. to SG. wor. c: to Da. E. c. to By. ORIGINAL x2520. x3350. P.II REAR SPRINGING. REAR AXLE MOVEMENT. We have carried out a series of tests to ascertain the maximum rebound movement… | ||
| img156 | Graph showing the effect of adjustable leak on Delco Lovejoy shock dampers on rear axle movement at various speeds. | ||
| View original record | DELCO LOVEJOY SHOCK DAMPERS EFFECT OF ADJUSTABLE LEAK ON REAR AXLE MOVEMENT BURTON ROAD LEVEL CROSSING. 25 EX CAR LOW RATING ROAD SPRINGS ROAD SPEED (M.P.H) 30, 35, 40, 45, 50 MAXIMUM REAR AXLE… | ||
| img157 | Graph showing the effect of drilled valves on maximum rear axle movement over a level crossing. | ||
| View original record | R.R. HYDRAULIC DAMPERS. EFFECT OF DRILLED VALVES ON MAXIMUM REAR AXLE MOVEMENT. BURTON ROAD LEVEL CROSSING. 25 EX CAR. LOW RATING ROAD SPRINGS. DAMPER LOADS. 90/90 LBS. ROAD SPEED (M.P.H) 30, 35, 40,… | ||
| img158 | Graph comparing the effect of drilled valves versus standard plain valves on rear axle movement. | ||
| View original record | R.R. HYDRAULIC DAMPERS. EFFECT OF DRILLED VALVES ON REAR AXLE MOVEMENT. ETWALL HUMP BACKED BRIDGE. 25 EX CAR. LOW RATING ROAD SPRINGS. DAMPER LOADS. 90/90 LBS. NORMAL BUFFER CLEARANCE. ROAD SPEED… | ||
| img159 | The results of Phantom II radiator tests comparing different tube types. | ||
| View original record | ORIGINAL. To R. From Hs/Rn. c. to Sg. Wor. c. to E. Da. c. to Sy. Hs/Rn.1/KT.21.4.31. x7250 x3678. P.II RADIATOR TESTS. We have now carried out the first series of tests comparing the latest square… | ||
| img160 | Continuation of a report discussing achieving adequate efficiency without costly tube shapes. | ||
| View original record | - 2 - Hs/Rm.1/KT.21.4.31.contd we may be able to get adequate efficiency without this somewhat more costly tube shape. A further report will be sent as soon as we can complete the tests. Hs/Rm. | ||
| img161 | Comparison table of different radiator tube types, detailing performance under various bonnet ventilation conditions. | ||
| View original record | TYPE OF RADIATOR TUBE CRITICAL AIR TEMPº. The difference between the top water temp. and Ats (St.) subtracted from 100º. This temp. represents that at which the car will eventually boil in still air… | ||
| img162 | Blueprint detailing the specifications, dimensions, and air pressure testing procedure for a matrix tube. | ||
| View original record | R.R.774(200M)(99879-27-3-30) N & G LTD. NO OPERATION MACHINE TOOL TOOL NO TUBES TO BE ANNEALED BY THE SUPPLIERS AGAINST SEASON CRACKING ONLY .300 +.50 LENGTH OF TINNING .250 +.25 ES1389 B 2151 C 2138… | ||
| img163 | Tests on brake inefficiency for Phantom cars, comparing different brake drum and shoe configurations. | ||
| View original record | ORIGINAL To R. From Hs/GML. c. to Sg. Hor. c. to E. Da. c. to Hy. Ha/GWH.4/KT.5.5.31. X4117 Y7366 We have been receiving a number of complaints from Owners, of the inefficiency of brakes on Phantom… | ||
| img164 | Brake tests, squeaking issues, and the merits of different brake drum and shoe combinations. | ||
| View original record | - 2 - These tests prove that the present L.H. cars and the present R.H. cars now being produced, which are fitted with the broad rear brake shoes and the 40% stiffer plain drums, should be free from… | ||
| img165 | Modifications and experiments on a twin choke carburettor's slow running scheme. | ||
| View original record | To R. from Hs/Lov. c. Sg. c. Wor. E. c. Da. Hy. ORIGINAL Hs/Lovl/AEL5.5.31. X7080: X1053. P.2. TWIN CHOKE CARBURETTERS. The slow running scheme we have employed on the twin choke carburetter fitted to… | ||
| img166 | Analysis of carburettor performance, focusing on idling mixture control and comparing different metering schemes. | ||
| View original record | -2- Now closing the throttles down to the slowest idling speed it was found the adjusting screw opposite the club foot (No.2 on diagram) had to be fairly well opened. The quality of the mixture could… | ||
| img167 | Technical description of the Zenith carburetter's slow running, starting, and accelerator pump schemes. | ||
| View original record | -3- Zenith slow running Scheme. We have just examined one of the latest double choke Zenith carburetters (36 D.U.P.) which has one or two interesting features. The slow running lay out is shewn on… | ||
| img168 | Carburettor components including the accelerator pump, slow running unit, and Zenith float. | ||
| View original record | Hs/Lovl/AM15.5.31 contd. -4- The piston is a working fit in the cylinder and the fuel replenishment obtained past a little loose disc valve attached to the base of the piston. The accelerating fuel is… | ||
| img169 | Blueprint showing a cross-section of a Phantom II Twin Choke Carburettor. | ||
| View original record | P.II TWIN CHOKE CARB. No. 1. ADJ. SCREW CLUB FOOT. No. 2. ADJ. SCREW. AHD | ||
| img170 | Blueprint detailing modifications for slow running on Phantom II twin choke carburettors. | ||
| View original record | MODIFICATION TO SLOW RUNNING ON TWIN CHOKE P.II CARBS ECCENTRIC DISCHARGE HOLE IN ROTATING BRASS PLUG SCREW HEAD FOR ROTATING BRASS PLUG TO ADJUST TICK OVER MIXTURE THESE PASSAGES BLANKED CWH/… | ||
| img171 | Diagram illustrating the Zenith slow running carburetor scheme. | ||
| View original record | ZENITH SLOW RUNNING SCH THROTTLE EDGE TOP DISCHARGE HOLE FOUR AIR HOLES DRILLED DOWN TO INTAKE SMALL DISCHARGE HOLE ABOVE THROTTLE DISCHARGE HOLE WITH MOVEABLE RESTRICTIONS UNCOVERED WHEN THROTTLE IS… | ||
| img172 | Application and testing of balance weights on 25 HP and Phantom 11 engines. | ||
| View original record | To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. Referring to - R.2/M12.5.31. As regards balance weights for the 25 HP. we have never yet received a scheme from .W.V. to fit balance weights to… | ||
| img173 | Crankshaft balance weights and critical speeds for the 25 HP and Phantom II models. | ||
| View original record | -2- Hs.1/MJ.16.5.31.Cont'd. In the case of the 25 HP. with the big pin crankshaft with twelve balance weights on, the master period is at 4,200 R.P.M. which can begin to be felt at 51 m.p.h. on third… | ||
| img174 | Table showing engine boiling temperatures in Celsius based on different types of bonnet ventilation at various speeds. | ||
| View original record | figures given are temp. at which Car will boil if driven for sufficiently long under the conditions named. C° | Type of Bonnet Ventilation | All out | 45 M.P.H. | 30 M.P.H. |… | ||
| img175 | Comparison of boiling temperatures for various radiator matrix types at 30 and 45 MPH. | ||
| View original record | TYPE OF RADIATOR MATRIX. Figures given Atm. Temp. at which the car will eventually boil if driven for sufficiently long under conditions specified. 30 M.P.H. | 45 M.P.H. Small Hexagon Ended American… | ||
| img176 | Proposal for a 10,000-mile test of a Phantom II in France to evaluate engine mountings, frame stiffness, and new pistons. | ||
| View original record | R. from Hs. c. Eg. c. WCr. I. c. Da. Ry. PHANTOM II 10,000 MILE TEST IN FRANCE. It is proposed to send a Phantom II car to France in order to try out there that the car will remain satisfactory with… | ||
| img177 | Continued list of modifications and proposals for components including the engine, crankshaft, petrol pump, radiator, brakes, and shock absorbers. | ||
| View original record | -2- Hsl/AD20.5.31 contd. Higher compression ratio. We have fitted, with Sg's permission, on two customers' cars modified cylinder heads to give a compression ratio of 5 : 1 instead of 4.6 Nitralloy… | ||
| img178 | Proposed changes and tests for various car components including springs, dynamo, starter, ignition, and exhaust. | ||
| View original record | Hal/AD20.5.31 contd. -3- Road Springs. These will be the low rating type which have been standardised and fitted to all L.H. cars. Dynamo. This will be the latest type with no tape on the armature… | ||
| img179 | Potential improvements to the appearance of the lowered controls for the 27-EX car. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. c. to Wor. c. to E. c. to Da. E. to By. Hs.2/MJ.20.5.31. X7246. LOWER CONTROLS. Whilst 27-EX. car is at N.W. we think it would be a good opportunity to clear up the… | ||
| img180 | Rear axle ratios for the Phantom II and 25 HP models, including gear options and procurement. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. Hs.7/MJ.20.5.31. X.7350. X.5350. REAR AXLE RATIOS. Referring to your suggestion of using higher axle ratios on our cars. The present axle… | ||
| img181 | Power output tests on a Continental Phantom II engine. | ||
| View original record | Read over from R engine & PII ORIGINAL To R. from Hs/Rm. c. Sg. c. WOR. Da. c. E. Hy. Hs/Rmd/AD23.5.31. CONTINENTAL P.II. POWER OUTPUT. X.7120. X.7771. We have had a run on a standard P.II. low… | ||
| img182 | 10,000-mile test, focusing on engine mounting schemes and frame distortion for Phantom and 25 HP models. | ||
| View original record | ORIGINAL To R. From Hs. c. to Sg. Wr. c. to E. Dn. c. to By. Hs.9/WJ.28.5.31. P.2 10,000 Miles Test. X.7770. X.7005. Replying to R.3/M22.5.31. If we carried out the suggestions contained in this memo… | ||
| img183 | Modification to cure rear foot brake groans on the Phantom II. | ||
| View original record | To R. from Hs/GWH. c. Sg. c. WCr. E. c. Ds. Ey. Hs/GWH/AD29.5.31. x7360. RE - PHANTOM II - REAR FOOT BRAKE GROANS. We have been carrying out extensive tests to cure the groans from the Phantom II rear… | ||
| img184 | Frame distortion tests measuring the effect of various engine mountings on torsional frame stiffness and 'jellying'. | ||
| View original record | To R. from Hs/lid. c. to Sg. Wor. c. to E. Ds. c. to Ev. Hs/lid.1/KT.29.5.31. X8380. X7380. X457. X7005. X8005. FRAME DISTORTION TESTS P.II. E.A.C.VII. AND P.I. We have carried out a series of tests… | ||
| img185 | Tests investigating chassis 'jellying' on various car models by analysing damping and engine mounting configurations. | ||
| View original record | (2) The next test was carried out on a P.I. car with solid rear feet and sheet aluminium dashboard Fig.VI. The obvious difference is the increase of damping over P.II. in its stiffest condition which… | ||
| img186 | Results of engine power tests on a Phantom II engine and the required modifications needed for further improvements. | ||
| View original record | ORIGINAL. To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to Hy. PN. ENGINE POWERS. We have been able to obtain a maximum of 180 HP. from a P.II. engine using camshafts with R. engine cams, low… | ||
| img187 | Experiments conducted on the Phantom II engine mounting to manage engine torque. | ||
| View original record | To R. From Hs/les. c. to Sg. Wor. c. to E. Da. c. to Hy. Ha/Les.3/MJ.2.6.31. X.7005. X.634. PHANTOM 2 ENGINE MOUNTING. Acting on your suggestion, we carried out experiments using the torque arm at the… | ||
| img188 | Experiments and recommendations for increasing horsepower on the P.2 engine. | ||
| View original record | To R. From Hs. c. to Sg. Vor. c. to E. Da. c. to By. P.2 EXPERIMENTS FOR INCREASING HP. We attach herewith curves which show the increase in HP. we have been able to obtain from a Std. P.2 engine with… | ||
| img189 | Power increasing experiments through modifications to carburettors, camshafts, and compression ratios. | ||
| View original record | To R. from Hs/Ewdl. c. Sg. Wor. c. E. Ds. c. Ev. Hs/Ewdl.1/ADS.6.31. POWER INCREASING EXPERIMENTS. Commencing from standard engine throughout running with open exhaust, we first fitted twin… | ||
| img190 | Analysis of engine power improvements achieved by using an Eagle IX carburetter. | ||
| View original record | Hs/Twd.1/AD3.6.31 contd. -2- Maximum power was finally obtained by using an Eagle IX carburetter having a 1.8" dia. choke, bolted direct to the induction manifold in place of the twin carburetter.… | ||
| img191 | Tests at Brooklands to evaluate higher geared axle ratios on Continental Phantom II type cars. | ||
| View original record | To R. From Hs/Rn. c. to Sg. WOR. c. to Da. E. c. to PN. Hs/Rn.1/KT.4.6.31. x7288 x7350 x7120 BROOKLANDS. HIGHER GEARED AXLE RATIO TESTS. Tests were carried out on Brooklands to determine whether it… | ||
| img192 | Performance tests on car 26-EX, focusing on axle ratios, speed, and aerodynamics. | ||
| View original record | - 2 - We then ran the cars side by side up to maximum speed from about 60 MPH. 26-EX did not appear to shew any superiority until over 70 MPH. At maximum speed there was not more than 2 MPH.… | ||
| img193 | Summary concluding that the 12 x 41 axle would not be an improvement for the standard production Continental type car. | ||
| View original record | - 3 - Hs/Bm.1/KT.4.6.31. Summarising the results, both Sales and ourselves came to the conclusion that the 12 x 41 axle would not improve our existing standard production Continental type car under… | ||
| img194 | Required horsepower for the Phantom II model to achieve 100 M.P.H. and methods for calculating tractive resistance. | ||
| View original record | ORIGINAL To E. From Hs/Rm. c. to Sg. Wor. Hs/Rm.7/KT.8.6.31. H.P. REQUIRED ON P.II. TO ACCOMPLISH 100 M.P.H. x7771. With reference to E4/M2.6.31. we think that undoubtedly the best method of getting… | ||
| img195 | Unsuitability of a 6:1 compression ratio for a production Phantom II vehicle. | ||
| View original record | To R. from HS. c. Sg. c. Wor. E. c. Da. HV. ORIGINAL 87770 87771 PHANTOM II. 6 : 1 COMPRESSION RATIO. In a recent memo you asked for P.2. to be fitted up with 6 : 1 compression ratio. We have no… | ||
| img196 | Camshaft experiments for the Phantom II engine, detailing results from varying valve timing, lift, and duration. | ||
| View original record | To E. From Hs/Rn. c. to By. ORIGINAL Hs/Rn.3/KT.12.6.31. 87090. P.II. CAMSHAFT EXPTS. We have conducted some experiments on camshafts on the P.II. The idea was that with the R. engine shaft we have… | ||
| img197 | Effects of exhaust cam timing, valves, and carburettors on engine performance. | ||
| View original record | - 2 - Diagram annotations: Top diagram: E.C. 10º, I.O. 66, E.O. 64 Bottom diagram: I.O. 12, E.C. 14, I.C. 65, E.O. 60 We have checked the effect of the short duration exhaust cam with a silencer and… | ||
| img198 | Engine performance metrics like BHP and comparing them to Bentley engines. | ||
| View original record | - 3 - and camshaft right, lowering the depression by a further 2" should give us 200 B.H.P. with a good low speed pick up since we still have 7" of water depression to pull the petrol out of the jet… | ||
| img199 | Power loss in the Phantom II engine exhaust system and silencer at high speeds. | ||
| View original record | ORIGINAL To R. From Hs/Rn. c.c. to SG. Nor. c.c. to Da. E. c.c. to By. Hs/Rn.3/RT.13.6.31. 07230 EXHAUST SYSTEM P.II. We find that as we increase the power output on the Phantom engine, our loss in… | ||
| img200 | Graph plotting the results of power tests on a PII unit, comparing performance with an open exhaust versus a standard silencer system. | ||
| View original record | POWER TESTS ON PII UNIT. TWIN CARBS R.R. 1.400 DIA: CHOKES. R TYPE PHANTOM SHAFT 110° TIMING AS ON 4.6.31 4.9 COMP: RATIO HEAD WITH DOUBLE VALVE SPRINGS TAPPETS SET { EXHAUST .008, INLET .006 BAR. 758… | ||
| img201 | Camshaft timing, valve specifications, and the results of various engine tests. | ||
| View original record | ORIGINAL To E. From Hs/Rm Hs/Rm.8/KT.17.6.31. 87090. 40/50. CAMSHAFTS. We have been trying to obtain some more information for you. TIMING LeC.2918. The first thing we did was to try and reproduce the… | ||
| img202 | Modifications to valve timing, camshafts, and valve lift to improve engine performance. | ||
| View original record | - 2 - (1) Dependant on Exhaust back pressure and on exhaust valve timing, i.e. increase exmust valve tappet clearance roar increased, divide exhaust manifold into 2 (Silver Ghost) no roar. Therefore… | ||
| img203 | Comparison of engine timing settings and resulting performance curves. | ||
| View original record | Hs 379 COMPARISON OF TIMING APPROXIMATING TO L.E.C. 2918 & BEST TIMING FOUND BY EXPERIMENT A TIMING APPROX. TO L.E.C. 2918 1/4" SHAFT B BEST TIMING R. ENGINE, CAMS 110° SHAFT C AS B BUT TAPPET… | ||
| img204 | Performance graph comparing large versus small valves on a 4.9 CR engine with a 114° R camshaft. | ||
| View original record | Hs. 380 COMPARISON LARGE & SMALL VALVES H.s. 380 4.9 CR 114° R CAMSHAFT OPEN EXHAUST SINGLE CLAUDEL CARB BOUNCE Valve Timing Diagram: EX IN 12 14 65.6 60 Left Y-Axis: B.H.P. Right Y-Axis: B.M.E.P.… | ||
| img205 | Blueprint comparing four different desirable camshaft timing diagrams for the 40/50 model. | ||
| View original record | DESIRABLE CAMSHAFTS FOR THE 40/50 1. S. 381 o 11 EX 240 INLET230 49 112° 25 H.P 2. 5.5° 7.6° EX 241 IN226 52 53.5 116° 40/50 LIFT .420 3. 2° 10° EX 240 IN240 58 50 BEST TIMING OBTAINABLE USING 40/50… | ||
| img206 | Tests conducted to ascertain and eliminate bonnet movement and knocks on un-made roads. | ||
| View original record | To R. From Hs/Les. c. to Sg. Wor. c. to E. Da. c. to Ey. Hs/Les.3/KT.18.6.31. 87-60. 87005. P.II. BONNET MOVEMENT. We have carried out tests to ascertain the movement of the bonnet when driving over… | ||
| img207 | The high-speed performance test of a Phantom II car (27-EX) at Brooklands, which resulted in a broken crankshaft. | ||
| View original record | To R. From Hs/Lid. c. to Sg. Wor. c. to E. Da. c. to By. ORIGINAL Hs/Lid.6/WJ.13.7.31. 87771 8788 PHANTOM 11 IMPROVED HIGH SPEED PERFORMANCE. We have taken 27-EX. car to Brooklands to ascertain the… | ||
| img208 | Diagrammatic study of bonnet movement measured in thousandths of an inch under a chassis twist test. | ||
| View original record | BONNET MOVEMENT IN .001 INS NEW SIDE FRONT & OFF SIDE REAR ROAD WHEELS RAISED 3" FROM THE GROUND FIG I P II 4 ENGINE FEET SOLID RAD DASH BONNET RADIATOR O.S. N.S. Measurements: -2, +2, 0, +8, -15,… | ||
| img209 | Page 2 of a report on vehicle troubles, including crankshaft, engine running, and petrol system issues. | ||
| View original record | -2- to turn the flywheel round, quite easily, the front end of the crankshaft remaining stationary. The car was then put on the rail at Weybridge station. It has not yet arrived at Derby so the extent… | ||
| img210 | Performance test results for car 27EX at Brooklands, showing an acceleration graph. | ||
| View original record | 27EX. CAR: PERFORMANCE TESTS ON BROOKLANDS. 10.. JULY 1931. R.R. TWIN CHOKE CARBURETTER. R ENGINE CAMSHAFT (110°) COMPRESSION RATIO 4 . 8:1 REAR AXLE RATIO STANDARD. (3.727:1) CAR WEIGHT COMPLETE 46… | ||
| img211 | Clarifying that no modifications have been made to the Phantom II cylinder head combustion chamber. | ||
| View original record | Nasty! To E. From Hs. ORIGINAL Hs.3/MJ.18.7.31. X7050. PHANTOM 11 CYL. HEAD. When I was at W.W. the other day you mentioned that you thought the Phantom 11 cylinder head had been modified, making the… | ||
| img212 | 10,000-mile test of shock absorbers detailing faults and proposed solutions. | ||
| View original record | ORIGINAL To H. From Hs/Rm. c. to Sg. Wor. c. to Da. H. c. to Hy. Hs/Rm.2/MJ.24.7.31. X.235. X.7520. 10,000 MILE TEST SHOCK ABSORBERS. We have received the following report from Hancock today, with… | ||
| img213 | Performance tests of a new high-power camshaft for the Phantom II engine, including comparative timing diagrams. | ||
| View original record | To R. From Hs/Rm. ORIGINAL c. Sg. Wor. c. Da. E. c. Ev. Hs/Rm2/AD5.8.31. x7090. x7771. HIGH POWER CAMSHAFT P.II. We have now run a number of tests on the new 120º camshaft LeC.2918. The best power we… | ||
| img214 | Analysis of engine performance focusing on valve lift, timing, and camshaft design for efficiency and power gains. | ||
| View original record | -2- It will be seen from the above tabulated figures that the valve area and lift are relatively very much the same for both engines. We carried out some tests on the 25 HP. unit with a view to… | ||
| img215 | Tabulated list comparing valve opening specifications for various engine models. | ||
| View original record | TABULATED LIST OF VALVE OPENINGS. | Engine | Dia. of inlet valve. | Lift of inlet valve | Ratio Lift/Valve Dia. | Valve area per litre disp. | |---|---|---|---|---| | F. engine | 1.625 | .550 | .337 |… | ||
| img216 | Camshaft comparisons for the P.2 engine, focusing on performance and silencing. | ||
| View original record | To E. from Hs/Rm. Hs/Rm4/AD5.8.31. WEST WITTERING 120º CAMSHAFT FOR THE P.2. 87090. We send you herewith a curve shewing a comparison between the standard camshaft, camshaft for the R. engine cams and… | ||
| img217 | Knocking sound caused by reaction dampers and friction plates, with a proposed solution. | ||
| View original record | P II ORIGINAL To E. from Hs/Rm. Hs/Rm4/AML1.8.31. x7941. We have the following note from GWH. in France :- "We noticed after fitting the new plates that a very pronounced knock developed in the front… | ||
| img218 | Development and testing of an air intake silencer for the Phantom II twin choke carburetter. | ||
| View original record | To R. from Hs/Lid. c. Sg. Wor. c. E. Da. Ry. ORIGINAL Hs/Lid/AM2.8.31. 87080 P.II. TWIN CHOKE CARBURETTER, AIR INTAKE SILENCER. We attach particulars of an air intake silencer which we have evolved… | ||
| img219 | Tests to diagnose the cause of persistent steering joggling in Phantom II cars. | ||
| View original record | To R. from Hs/Lid. c. Sg. Wor. c. E. Da. Ry. ORIGINAL P.II. STEERING. We have lately carried out a number of tests to find out more about the conditions which are necessary to cause the persistent… | ||
| img220 | Comparative road tests on a flexible shackle, front tyre pressures, and wider wheel track at 50 M.P.H. | ||
| View original record | -2- The route chosen for the comparative tests was a straight road on which it was possible to maintain a speed of 50 M.P.H. over the majority of a twelve mile stretch. All the results given are the… | ||
| img221 | The effects of damping, steering tube springs, front axle modifications, and tyre conditions on vehicle performance. | ||
| View original record | -3- HS/LidB/AD31.8.31 contd. to damp it out almost entirely. Damping in the Column. This is of no use to us unless used in conjunction with the flexible shackle. Under these conditions the maximum… | ||
| img222 | Continuation of a report on spring eye movement during braking and road tests. | ||
| View original record | HS/Lid3/AD31.8.31 contd. -4- of the spring eye is always greater than forward movement, the difference being about 33% under main road conditions but becoming more equal on very bad potholed roads. We… | ||
| img223 | Tests conducted to investigate the cause of persistent steering 'joggling' in Phantom II cars. | ||
| View original record | To R. from Hs/Lid. c. Sg. Wor. c. E. Da. Ry. ORIGINAL. xy5) X9430 Hs/Lid3/AD31.8.31. P.II. STEERING. We have lately carried out a number of tests to find out more about the conditions which are… | ||
| img224 | Blueprint diagram for a steering 'Snatchmeter' device. | ||
| View original record | STEERING 'SNATCHMETER' THIS PORTION FIXED TO CAR THIS 'PAWL' PERMITS ANTECLOCKWISE ROTATION OF RECORDING DISC & STOPS CLOCKWISE ROTATION. SPRING LOADED PAWLS STEERING COLUMN RECORDING DISC HAS VERY… | ||
| img225 | Graphs showing the maximum forward and backward movement of a spring eye for a flexible shackle under various test conditions. | ||
| View original record | FLEXIBLE SHACKLE (HS 213) MAXIMUM MOVEMENT OF SPRING EYE Top Bar Chart: Conditions: - HARD BRAKING - TURNING ON FULL LOCK AS FAST AS POSSIBLE - L.H. LOCK - R.H. LOCK - VERY BAD ROAD HITTING BUFFERS… | ||
| img226 | Analysis of crankcase cracking in two test bed engines and proposed solutions to strengthen the design. | ||
| View original record | To R. From Hs/Gry. c. to Sg. Wor. c. to E. Da. c. to By. (Stamp: ORIGINAL) Hs/Gry.2/MJ.31.8.31. P.11 CRANKCASES. (Handwritten: X7000) Two of our test bed engines, each of which has done about 400… | ||
| img227 | Experimental work to improve car cooling systems, including tests on dented radiator tubes. | ||
| View original record | To R. from Hs. c. Sg. WOR. c. L. De. c. Hy. FN. ORIGINAL. Hel/AD2.9.31. X.766. X.7250. P.II. COOLING. During the last 12 months a lot of experimental work has been done to improve the cooling but we… | ||
| img228 | Engine overheating issues and potential solutions involving different tube types for various car models. | ||
| View original record | Hel/AD8 2.9.31 contd. -2- best we know of, we should still get boiling if the conditions were sufficiently severe. 25-EX car which had the large U.S.A. type tubes, has been driven under similar… | ||
| img229 | Tests of twin carburetters for the Phantom II, detailing flooding issues related to different float designs. | ||
| View original record | To R. From Hs/Swn. c. Sg. Wor. c. E. Da. c. Ev. ORIGINAL X7080 Hs/Swn.1/AHR.7.9.31. TESTS OF R.R. TWIN CARBURRETTERS FOR PHANTOM II. MODIFIED TO Lec.2805/6. The main modification to the twin… | ||
| img230 | Technical note on carburettor adjustments and modifications for slow running. | ||
| View original record | Hs/Swn.1/AM 7.9.31 contd. -2- Slow Running. The double slow running feed gives good results over the idling range when correctly adjusted i.e. .025 jet, the front adjustment unscrewed 1 1/4 turns and… | ||
| img231 | Technical note on adjustments and tests for variable valves and diffusers. | ||
| View original record | Hs/Swn.1/AD17.9.31 contd. -3- Variable valves and diffusers. By making the feed holes in the variable valve sleeves (.066 dia. and three in number) we can with the existing variable valves obtain a… | ||
| img232 | Blueprint of a slow running scheme for a twin choke carburettor. | ||
| View original record | V.1058 ADJUSTING SCREW TO BE FIXED TIGHT WITH GUIDE & SPRING IN POSITION. SLOW RUNNING SCHEME. (TWIN CHOKE CARB.) PI L.H. 16-2-31 | ||
| img233 | Analysis of power output tests on a Phantom II engine, focusing on the effects of different camshaft and valve configurations. | ||
| View original record | To R. from Hs/Rm. c. Sg. c. WOR. E. c. Da. EV. ORIGINAL Hs/Rm.1/AM8.9.31. x7771 x7090. POWER OUTPUT P.II. Attached are the results of a number of tests on the P.II to obtain the best power output with… | ||
| img234 | Engine power output related to different valve sizes and camshaft timings. | ||
| View original record | Hs/Rm.1/ADL8.9.31 contd. -2- Size of Valve. Rm. P20. gives the power obtainable with inlet valves having a throat dia. of 1.680" or approx. 30% smaller than standard. 114º camshaft to E.82448 used… | ||
| img235 | Graph comparing the performance (BHP vs RPM) of twin carburettor setups with different choke sizes against a standard carburettor system. | ||
| View original record | TWIN R-R- CARBS AND INDUCTION SYSTEM COMPARISON WITH STANDARD PI CARBURETTOR AND INDUCTION SYSTEM TEST BED EXHAUST SYSTEM V1023 BHP 120 110 100 90 80 70 60 50 40 RPM 1000 1500 2000 2500 3000 TWIN… | ||
| img236 | Graph comparing Brake Horse Power and Brake Mean Effective Pressure for large vs small valves under different carburetor configurations. | ||
| View original record | COMPARISON OF LARGE & SMALL VALVES RM. P.15 4.78 CR W.W. 114° SHAFT L.E.C. 2818 OPEN EXHAUST INS. DEPN. 3000 RPM LARGE VALVES C DENOTES CLAUDEL 1.90 T TWIN CARB 1.4 DIA CHOKE 2.55 B.H.P. B.M.E.P.… | ||
| img237 | Performance graph comparing high lift rockers, showing B.M.E.P. against R.P.M. for different valve lifts and carburettors. | ||
| View original record | COMPARISON OF HIGH LIFT ROCKERS RM P 20 SMALL VALVE HEAD 4.75 C/R INLET VALVE THROAT 1.680 114° CAMSHAFT E. 82448 TIMING AS IN RM P 19 VALVE LIFT .525 VALVE LIFT .470 CLAUDEL CARB R.R TWIN CHOKE CARB… | ||
| img238 | Performance graph comparing engine configurations with different valve lift timings and a machined head. | ||
| View original record | COMPARISON OF VALVE LIFT 114° SHAFT R.M. P.19 LARGE VALVE HEAD 4.78 C/R 2.0" VALVE THROAT 114° CAMSHAFT ROCKER RATIO STANDARD TIMING ON C.L.C.E. TWIN CARBS I.O. 13° B.T.C. E.O. 56.5° B.B.C. I.C. 58.5°… | ||
| img239 | Performance graph showing the effect of increased valve lift on a 4.78 compression ratio engine. | ||
| View original record | RM P22 EFFECT OF INCREASED VALVE LIFT ON 4.78 C/R STD: CYLINDER HEAD 1.9" DIA. VALVE THROAT 114° CAMSHAFT TO E.82448 OPEN EXHAUST VALVE LIFT .525 VALVE LIFT .470 CLAUDEL TWIN CARBS 1.4" CHOKES B.H.P.… | ||
| img240 | Performance comparison graph showing the effect of various inlet valve durations for different cam profiles. | ||
| View original record | Title: COMPARISON OF VARIOUS INLET VALVE DURATIONS Configuration: 4.78 C/R OPEN EXHAUST STD ALUM HEAD. R.R. TWIN CARBS 1.4" CHOKES 1.8" DIA VALVE THROAT. .013 TAPPET CLEARANCE. Graph Key: Curve A: SCH… | ||
| img241 | Graph comparing engine performance with different valve sizes, carburettors, and timings on a W.W. 114° camshaft. | ||
| View original record | RM. P. 24 COMPARISON OF VALVE SIZES W.W. 114° CAMSHAFT 4.78 C.R. P.II UNIT OPEN EXHAUST VALVES 2" THROAT HEAD MACHINED TO GIVE A MINIMUM CLEARANCE OF .2" ROUND VALVE STD. 1.90 THROATS HEAD STANDARD… | ||
| img242 | Performance chart showing the effect of increased valve lift on a standard camshaft and cylinder head. | ||
| View original record | RM. P.25 EFFECT OF INCREASED VALVE LIFT ON STANDARD CAMSHAFT AND CYL HEAD TWIN CHOKE CARB. 1.4" CHOKES OPEN EXH: 4.78 C/R. STD ALUM HEAD 1.9 VALVE THROAT VALVE LIFT .430 VALVE LIFT .480 BHP B.M.E.P.… | ||
| img243 | Blueprint drawing of an inlet valve with a 30-degree seat and small diameter. | ||
| View original record | Hs 372 .450 ±5 .025 CHAMFER AT 45° ±10 ±2° 1.830 DIA ±2 30° ± 1/2° OTHER DIMENSIONS TO E78493 INLET VALVE [30° SEAT SMALL DIA] PII 1.500 DIA ±0 1.680 DIA ±2 | ||
| img244 | P.2 Cooling Tests, specifically regarding air pressure under the bonnet. | ||
| View original record | ORIGINAL To R. From Hs/Lid. c. to Sg. Wor. c. to E. Da. c. to By. Ha/Lid.1/WJ.19.9.31. X766 X7250 X7260 P.2 COOLING TESTS. Further to Hs/Lid.1/AD.17.9.31, we have recorded the air pressure existing… | ||
| img245 | Blueprints and the production impracticality of 5/1 and 5½/1 compression ratio heads without a complete redesign. | ||
| View original record | To E. From Hs/Rm. Hs/Rm.4/MJ.22.9.31. X7050. Herewith blue prints of E.82168 and E.82455, the 5/1 and 5½/1 compression ratio heads respectively as produced by the D.O. We think that you will agree… | ||
| img246 | Phantom II cooling tests comparing hexagonal matrix radiator tubes and the effects of ventilation on a 25-EX chassis. | ||
| View original record | To R. from Hs/Lid. c. Sg. c. WOR. E. c. Da. RV. ORIGINAL Hs/Lid.1/AD30.9.31. x7750. x766. P.II COOLING TESTS. We attach herewith results of further cooling tests in which the air temperature rise… | ||
| img247 | Tests showing high air temperatures under the floorboards, highlighting the discomfort and need for improved ventilation. | ||
| View original record | -2- The most outstanding fact shown up by these tests is the air temperature recorded under the floor boards near the pedals. In France a temperature of over 80°C. was recorded on this car, the… | ||
| img248 | Analysing the power output of the Phantom II P.2 engine based on tests with different choke sizes, camshafts, and carburetter configurations. | ||
| View original record | To E. from Hs./Rm. PHANTOM II POWER OUTPUT. We have nearly completed the tests you asked for regarding the choke size required to give the 3" depression on the P.2 engine at 1500 R.P.M. and at the… | ||
| img249 | Carburetter types, their performance characteristics, and required dimensions for different engine models. | ||
| View original record | -2- All we are trying to indicate by sending you these curves is that there is a very real difference between 3" and 2" induction pipe depression and that there are expanding carburetters in existence… | ||
| img250 | Power output and testing of the Model Continental car. | ||
| View original record | ORIGINAL To R. From Hs/Rm. c. to Sg. Wor. c. to Da. E. c. to By. POWER OUTPUT MODEL CONTINENTAL CAR. We attach herewith power curves of the unit we have just fitted to 27-EX, the "Model" car. The… | ||
| img251 | Power loss in the P.2. exhaust system and concerns for customers with the Continental Type model. | ||
| View original record | Da. from Hs/Rm. ORIGINAL Hs/Rm.1/AD9.10.31. X7230, We are not sure whether Ev. had a copy of the curve showing the loss in the P.2. exhaust system when we increased the power. We therefore send one… | ||
| img252 | Status of fitting experimental modified exhaust manifolds to a Phantom 1 and another car. | ||
| View original record | COPY. Sevres. Hs/Lid. HmW/A16/GM.6.10.31. Re. Experimental modified exhaust manifolds. With reference to your memo Hs/Lidl/MJ.2.10.31 the position is this: (1) We are at present overhauling a Phantom… | ||
| img253 | Performance issues and modifications for a 25-EX fitted with an A.C. petrol pump. | ||
| View original record | COPY. RE - 25-EX FITTED WITH THE A.C. PETROL PUMP. We found that with the petrol pump giving a 5 lbs pressure to the carburetter float chamber, it was necessary to reduce the needle valve seating… | ||
| img254 | Experiments and modifications conducted on a Phantom II petrol pump, comparing its performance with an A.C. pump. | ||
| View original record | To E. from Hs/W.Bell. Hs/Bell.1/ADL 3.10.31. LeC.2907/9. P.II PETROL PUMP. x7460. The following experiments were taken with a standard petrol tank and petrol pipes in the suction circuit, with a cam… | ||
| img255 | Increased performance tests of a 27-EX car at Brooklands track with non-standard engine parts. | ||
| View original record | To R. From Hs/Lid. c. Sg. c. WOT. R. c. Da. Ev. X.7120. X.7771. X.788. Hs/Lid.1/AWR.5.10.31. P.II INCREASED PERFORMANCE. BROOKLANDS 5.10.31. 27-EX car was taken to Brooklands track with the idea of… | ||
| img256 | Proposal for modifications to be adopted as standard for the flip flap shutters on the 22-EX rivetless bonnet. | ||
| View original record | To R. From Hs/Lid. c. to Sg. By. Hs/Lid.6/KT.19.10.31. X1085 X7260 FLIP FLAP SHUTTERS. It is proposed that the modifications to the flip flap shutters showed to 'R' on the rivetless bonnet on 22-EX… | ||
| img257 | Clearances, dimensions, and paint thickness for bonnet shutters. | ||
| View original record | DA/EV. from Hs/Lid. c. to Wor. Sg. By. ORIGINAL Hs/Lid.2/RT.21.10.31. X.1085. X.385. BONNET SHUTTERS. With reference to DA/EVL/M20.10.31, the flip flap shutters which were approved by Sales had… | ||
| img258 | Performance review and specification breakdown of the Talbot 90 car from the Olympia Motor Show. | ||
| View original record | See Page 8 for comparison To R. from Hs/Rm. c. Sg. Wor. c. E. De. Dv. Hs/Rm.1/AD26.10.31. x631. OLYMPIA MOTOR SHOW. We had the opportunity of trying three 18 HP. cars at the Motor Show. TALBOT 90.… | ||
| img259 | Technical review of the Talbot 75 and the 18/80 M.G. Mark II, detailing performance, specifications, silence, and vibrations. | ||
| View original record | -2- powerful and progressive but since self servoing shoes were fitted to the front wheels, one would not expect them to remain well equalised. The steering was very fair, the clutch only worked… | ||
| img260 | Road performance review of a car, followed by detailed specifications for a Hispano Suiza 12 cylinder engine. | ||
| View original record | -3- between 3000 - 4000 r.p.m. the engine was really delightfully smooth and there was no vibration on the over-run. The cylinder block is a solid casting with the top half of the crankcase. Road… | ||
| img261 | Continued vehicle evaluation report discussing chassis, silence, vibration, and performance. | ||
| View original record | -4- No form of centralised lubrication is fitted. The chassis is a foot longer than the well known Boulogne and 37 HP. and also increased in track. The brake drums have been increased slightly in… | ||
| img262 | Comparative analysis of vehicle components including brakes, clutch, and engine mounting, with references to Hispano and Chrysler models. | ||
| View original record | -5- The brakes appeared to be exactly similar to previous Hispano practice. The clutch is now a multiplate (7 or 8 plates) and operated satisfactorily. The steering was reasonably light and free from… | ||
| img263 | Report page detailing changes to an inlet manifold and other vehicle specifications. | ||
| View original record | -6- Hs/Rm.l/AD26.10.31contd. Inlet Manifold. A new inlet manifold with a single down-draught. Instead of one branch supplying the four inner and one the four outer cylinders, the pipe is as shown in… | ||
| img264 | Observations on radiator mountings, induction pipes, carburetters, and engine mountings from competing car manufacturers. | ||
| View original record | -7- Other items of interest were :- Radiator Mounting. Hispano appeared to have some form of centre point mounting. Morris ties the radiator to the dashboard by two diagonal stays. Induction Pipes. We… | ||
| img265 | Non-technical precis of competitor cars. | ||
| View original record | -72- Hs/Rm.1/AD26.10.31 contd. A brief non-technical precis of the cars tried is :- Talbots. Un-refined, over-geared. Would be tiring to drive and it would be hard work to put up a high average speed.… | ||
| img266 | Summary of impressions from a show, comparing British and American cars on price, silence, and smoothness. | ||
| View original record | Hs/Rm.1/AD26.10.31 contd. -8- Summary. The general impression left by the show is that whilst British manufacturers have an almost complete ascendency in cars below 16 H.P., in the 25 - 35 HP. class… | ||
| img267 | Comparing the power output of a single jet experimental carburettor against a fixed choke diffuser type. | ||
| View original record | ORIGINAL To R. from Hs/Ra. c. to Sg. Wor. c. to Da. K. c. to Hy. ---------------- POWER OUTPUT. SINGLE JET EXPERIMENTAL CARB. COMPARED WITH FIXED CHOKE DIFFUSER TYPE. [Handwritten] X1487. X1452. We… | ||
| img268 | Report page discussing the effects of valve lift and clearance on engine brake horsepower. | ||
| View original record | -2- us greater duration of opening on the inlet valve. We might also gain from a greater lift on the exhaust valve. A test with the 114° shaft A. shewed that if the exhaust valve clearance was… | ||
| img269 | Graph comparing different induction pipes and carburettors, plotting BHP and induction depression against engine RPM. | ||
| View original record | Top Graph Title: COMPARISON OF BEST S.U. INDUCTION PIPE & CLAUDEL CARB. Bottom Graph Title: COMPARISON OF 1 7/8 THROTTLE DIA S.U. ON TWO DIFFERENT INDUCTION PIPES Right Axis Title: 112° CAMSHAFT JAPAN… | ||
| img270 | Results of a rough test on masked inlet valves. | ||
| View original record | To R. from Hs/Rn. c. to Sg. Wor. c. to L. Da. c. to HY. ORIGINAL Hs/Rn.1/KT.29.10.31. X7090. MASKED INLET VALVES. With reference to your suggestion that it would be worth trying slightly masked inlet… | ||
| img271 | Performance comparison graph between a 108° masked camshaft and a 114° unmasked camshaft. | ||
| View original record | RM P.30. COMPARISON OF 108° MASKED CAMSHAFT AND 114° E82448 UNMASKED CAMSHAFT OPEN EX. C/R.47 HIGH LIFT ROCKERS TWIN CARBS 1.4 CHOKES MASKED CAMSHAFT INLET LIFT .547 EXHAUST .469 Axes: B.H.P.… | ||
| img272 | Performance comparison graph between a 112° masked camshaft and a 114° unmasked camshaft. | ||
| View original record | RM.P.31. COMPARISON OF 112° MASKED CAMSHAFT AND 114° UNMASKED CAMSHAFT. OPEN EX. C R 4.7 HIGH LIFT ROCKERS. TWIN CARBS 1.4 CHOKES. MASKED SHAFT. INLET LIFT .547 EXHAUST LIFT .469. R.P.M. IND DEPN INS… | ||
| img273 | Performance graph comparing Brake Horsepower and Brake Mean Effective Pressure against RPM for different exhaust system configurations. | ||
| View original record | RM. P 33. LOSSES TO EXHAUST SYSTEM. PH. II SHORT TYPE. C.O. OPEN AND CLOSED 4.6 C/R 108° MARKED VALVE CAMSHAFT TWIN CARBS 1.4 CHOKES B.H.P 160 150 140 130 120 110 100 90 80 R.P.M. 500 1000 1500 2000… | ||
| img274 | Mechanical failures observed during high-speed test bed running of the Phantom II engine. | ||
| View original record | To R. From Hs/Rm. c. Sg. c. Wor. E. c. Da. EV. ORIGINAL X7770 Hs/Rm.1/ADS.11.31. HIGH SPEED RUNNING OF THE P.II ENGINE. Recently we have done quite a fair amount of test bed running between 3000 and… | ||
| img275 | Blueprint diagram showing a cracked cylinder head assembly. | ||
| View original record | CYLINDER HEAD CRACKED HERE 2-11-36 C.TS. | ||
| img276 | Synchro-mesh gearbox test for the Phantom II, focusing on its performance with increased inertia. | ||
| View original record | To R. From Hs/Gry. c.c. to Sg. Wor. c. to E. Da. c. to By. Ha/Gry.2/WJ.12.11.31. Y7310 PHANTOM 11 SYNCHRO-MESH GEARBOX. As requested in Dal/M26.10.31. we have carried out a test on the 25 HP.… | ||
| img277 | Blueprint outlining a list of twelve design features for a mechanical component. | ||
| View original record | FEATURES 1 ALL VALVE SEATS HORIZONTAL 2 VALVES ACCESSIBLE 3 MINIMUM AMOUNT OF DRILLING MAXIMUM SIMPLICITY OF HOLES 4 VALVE CHAMBERS VENT ONE INTO THE OTHER AND INTO MAIN CHAMBER, HENCE BY GROOVE IN… | ||
| img278 | Cross-sectional blueprint of a mechanical assembly indicating maximum rebound and bump levels. | ||
| View original record | MAX REBOUND, MAX BUMP, SECTION XY | ||
| img279 | Blueprint drawing of a mechanical pump or casing assembly. | ||
| View original record | ", | ||
| img280 | Graph showing the output speed performance of various dynamos, plotting ampere output against RPM. | ||
| View original record | AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 OUTPUT SPEED PERFORMANCE OF VARIOUS DYNAMOS FULL CURVE LUCAS E.6 I. R.R. 56 COIL PHANTOM II DYNAMO 9 AMP II. R.R. 48 COIL MEDIUM OUTPUT DYNAMO III.… | ||
| img281 | Graph showing output speed performance curves for various dynamos at 80°C. | ||
| View original record | 40/50 OUTPUT SPEED PERFORMANCE CURVES OF VARIOUS DYNAMOS AT 80°C FULL CURVE LUCAS E.60 DYNAMO N° E.1640 I. R.R. 56 COIL PHANTOM II DYNAMO 9° 122° (62°C SETTING) II. R.R 48 COIL MEDIUM OUTPUT DYNAMO… | ||
| img282 | Performance graph of B.M.E.P. and B.HP against R.P.M. for a 3.9 Litre 6-cylinder engine. | ||
| View original record | MULTICYL. ENGINE HIGH POWER HEAD 85 x 115 M/M 6 CYLS. 3.9 LIT C.R. 5.45/1 TWO 42 M/M ZENITH TRIPLE VENTURI CARBS 34 CHOKES SHELL No 1 PETROL B.M.E.P. 120 100 80 B.M.E.P. (SINGLE CYL.) B.M.E.P. (6… | ||
| img283 | Performance graph of a 3.9 Litre, 6-cylinder engine, showing B.HP and B.M.E.P. against R.P.M. | ||
| View original record | 85 x 115 M/M 6 CYLS. 3.9 LITRES SINGLE CYL. ENGINE 48 H.K. ZENITH CARB R 39 CHOKE C.R. 5.5/1 B.M.E.P. (SINGLE CYL.) B.M.E.P. (6 CYL.) B.H.P. B.H.P. 120 100 80 60 ON 7/FEB/30 EN BEATEN R.P.M. 24 28… | ||
| img284 | Graph comparing power curves (BHP and MEP) for a Phantom II engine with three different camshaft specifications. | ||
| View original record | P.II. POWER CURVES (ALL TAKEN OPEN EXHAUST) A R.TYPE 110° SHAFT. TWIN CARBS 1.300 DIA CHOKES. STD. COMP. RATIO B. W.W. " 120° SHAFT. " C STD. 116° SHAFT. " V1182 B.H.P. 170 150 130 110 90 70 50 MEP… | ||
| img285 | Graph of engine B.HP and M.E.P. against R.P.M. with corresponding valve timing diagrams for three different camshafts. | ||
| View original record | B.H.P. 110 90 70 50 30 R.P.M. 500 1000 1500 2000 2500 3000 3500 M.E.P lbs/sq in 110 90 70 TIMING WITH .013 TAPPET CLEARANCE A TDC I.O. 26° 23° E.C. I.C. 66° 67° E.O. B.D.C. VALVE LIFT .492 CAM .3755 B… | ||
| img286 | Log of 20 EX steering tests using a snatchmeter to record performance under various conditions. | ||
| View original record | 20 EX. STEERING TESTS USING SNATCHMETER FOR RECORDING TEST NO | CONDITIONS OF DRIVING | CONDITION OF CAR AS TESTED --- | --- | --- 1 | STEERING WHEEL HELD NORMALLY | FLEXIBLE SHACKLE. FRONT TYRES AT… | ||
| img287 | Table of steering tests using a snatchmeter to record joggling under various conditions. | ||
| View original record | EX. STEERING TESTS USING SNATCHMETER FOR RECORDING JOGGLING. TABLE DATA: | Test No. | Conditions of Driving | Condition of Car as Tested | Steering Wheel Movement (Turns) | Effect |… | ||
| img288 | Graph of cooling tests showing air temperature rise across the radiator with the bonnet on and off. | ||
| View original record | 25EX. COOLING TESTS :- AIR TEMPERATURE RISE ACROSS RADIATOR. AIR TEMPERATURE RISE FROM FRONT OF RADIATOR TO FLOORBOARDS. USING .268" HEXAGONAL MATRIX TUBES. BONNET OFF. (AVERAGE AIR TEMP: 11.5°C)… | ||
| img289 | Graph of air temperature rise tests across a radiator and from the radiator to the floorboards, plotted against road speed. | ||
| View original record | TESTS :- AIR TEMPERATURE RISE ACROSS RADIATOR. AIR TEMPERATURE RISE FROM FRONT OF RADIATOR TO FLOOR BOARDS. USING 26B" HEXAGONAL MATRIX TUBES. (AVERAGE AIR TEMP: 11.5°C). BONNET ON. (AVERAGE AIR TEMP:… | ||
| img290 | Blueprint graph comparing air temperature rise across a radiator with the bonnet on and off at various road speeds. | ||
| View original record | 25 EX. COOLING TESTS :- AIR TEMPERATURE RISE ACROSS RADIATOR. AIR TEMPERATURE RISE FROM FRONT OF RADIATOR USING 3 1/2 " HEXAGONAL MATRIX TUBES. Left Graph: BONNET OFF. AVERAGE AIR TEMP: 12.5 °C… | ||
| img291 | Graph plotting air temperature increase versus road speed for a radiator using hexagonal matrix tubes. | ||
| View original record | TESTS:- AIR TEMPERATURE RISE ACROSS RADIATOR. AIR TEMPERATURE RISE FROM FRONT OF RADIATOR TO FLOORBOARDS. USING 3 1/2" HEXAGONAL MATRIX TUBES. AVERAGE AIR TEMP: 12.5°C TEMP: - 57.5°C TEMP: - 85°C… | ||
| img292 | Performance graph comparing different carburetor choke sizes for a Pit Unit B.J.55 engine. | ||
| View original record | PIT UNIT B.J.55. FOR 27 EX. RM. P26 23/9/31 COMPARISON OF 1 3/8 AND 1 1/4 CHOKES. 114° E82448 CAMSHAFT RR TWIN CARBS. 4.88 C/R OPEN EXHAUST STANDARD ROCKERS. ① 1 1/4" DIA. CHOKES. ② 1 3/8" DIA.… | ||
| img293 | Engine performance graph showing Brake Horsepower, Brake Mean Effective Pressure, and valve timing against RPM. | ||
| View original record | B.H.P. 140 130 120 110 100 90 80 R.P.M 500 1000 1500 2000 2500 3000 3500 B.M.E.P. LBS/SQ. 110 100 90 80 70 60 INDUCTION DEPN INS HG. 3 2 1 ① ② ③ Valve Timing Diagram: Ex 60 .013 CLCE. 2.2 12.7 IN 56.5 | ||
| img294 | Performance test results for the 27 Ex. Car at Brooklands, detailing acceleration and speed data. | ||
| View original record | L C.2905/6 27 Ex. CAR. PERFORMANCE TESTS ON BROOKLANDS 5TH OCT. 1931 R.R. TWIN CHOKE CARBURETTER. (MODIFIED TO CURE FLOODING ON CORNERS) WITH AIR SILENCER (EXPTL.) 114° W.W. CAMSHAFT (E.82448)… | ||