Rolls-Royce Archives
| Identifier | Entry | ||
| 02-page001 | Blueprint diagram illustrating where a crack occurs in a cylinder head. | ||
| View original record | CYLINDER HEAD CRACKED HERE | ||
| 02-page002 | Stiffening camshafts for the rear brakes by increasing their diameter and drilling them out, comparing them to the Phantom model. | ||
| View original record | To BY. from DA. c. to BJ. HS. 47090 DA2/M3. 5. 27. EAC. 7. FRONT BRAKES. X. 7420 X. 7090 X. 7360 With reference to the question of reducing the sponginess of the rear brakes, we send herewith N.sch.… | ||
| 02-page003 | Sponginess in EAC. 7. rear brakes and the required modifications. | ||
| View original record | To BY. from DA. To HS. 7090. DA2/M9.5.27. SPONGINESS IN EAC. 7. REAR BRAKES. X.7360 X.7090 We intended when sending you the stiffened camshafts, to say that N.Sch.2385 should be proceeded with,… | ||
| 02-page004 | Camshaft bearings, enclosing drawing Lec.2519. | ||
| View original record | X. 7090 BY. from E. c. to BJ. Hs. E8/M6.3.28. EAC.10 CAMSHAFT BEARINGS. We send you herewith Lec.2519 shewing the above. [Faded underlying text:] splash lubrication, but the central web arranged to… | ||
| 02-page005 | Material and design of camshaft bearings, suggesting aluminium alloy or magnesium. | ||
| View original record | E. Hs. BY. From R. c. to BJ. Wor. X 7090 R2/M9.3.28. CAMSHAFTS - re. LeC.2519 + 8090 BEARINGS ; These I agree can be in aluminium alloy or magnesium, whichever is the better wearing alloy. They should… | ||
| 02-page006 | Valve lift curves, required accelerations, and related drawings for an engine. | ||
| View original record | BY. from E. c. to BJ. Hs. x7090 E3/M9.5.23. EAC.10 VALVE LIFT CURVES. X.7060 X.7090 X.290 We send you herewith drgs. Lec.2558 and 2559 dealing with the above. These drawings give particulars of the… | ||
| 02-page007 | Oil leaks from the F.2.B. Chassis rocker shaft cover caused by movement during testing. | ||
| View original record | X.7090 Hs Mx/MdW4/T28.6.28. F.2.B. Chassis We find that during test there is a considerable movement of the rocker shaft cover relative to the cylinder head. This produces oil leaks resulting in grey… | ||
| 02-page008 | Widening of cams for valve gear to improve wear and lubrication. | ||
| View original record | BY. from E. c. to BJ. Hs. X7090 E2/M25.7.28. EAC.10 VALVE GEAR. X.7060 X.7090 BY/CGH7/K19.7.28. Re. Lec.2464, and in reply to your memo. we wish to make the cams .700 wide instead of .5. This… | ||
| 02-page009 | Change in the manufacturing process for super sports engine timing gears. | ||
| View original record | BY. from R. c. to BJ. Wor. Hs. +7090. R2/M28.8.23. SUPER SPORTS ENGINE - TIMING GEARS. X.411 X.7090 With reference to the camshaft and carrier gear wheels, it has occurred to me that it might be… | ||
| 02-page010 | Alteration to engine timing, proposing two new camshaft designs with diagrams. | ||
| View original record | Hs. from E. c. to BJ. BY. Y7096 E2/1430.8.28. EAC.10 ENGINE. K.7090 K.411 X.1770 Referring to your report Hs/ACL1/LG28.8.28., it is concluded that an alteration to the timing would be beneficial, and… | ||
| 02-page011 | New design for the Phantom rocker cover to prevent oil leaks and reduce tappet noise. | ||
| View original record | To Hs. from Hs/GWH. C. to Mx. C. to BY. [Struck through] [Handwritten] X7090 Hs/GWH/LGL.9.9.28. PHANTOM ROCKER COVER. [Handwritten] X7090 To overcome the Test Dept. complaint of oily aluminium running… | ||
| 02-page012 | Recommending the adoption of a new Phantom Rocker Cover after testing proved it superior to the standard version which had a tendency to loosen. | ||
| View original record | Hs/GWH from Mx. K8 X7090 Mx2/T18.9.28. PHANTOM ROCKER COVER Reference to memo Hs/GWHl/LG1.9.28. we have tested the special Rocker Cover handed to us by GWH, and it entirely overcomes our complaints.… | ||
| 02-page013 | The performance of the 'SS' engine, detailing running conditions, induction distribution, and optimal camshaft timings. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to E. DA. c. to BY. X7090 Hs/ACL1/LG20.9.28. 'SS' ENGINE. X7090 X9070 X1452 X7771 Engine No. SS-3. Running conditions: Claudel Hobson Carburetter (Eagle 1X) Hot… | ||
| 02-page014 | Comparison of 110° and 116° camshaft performance with notes on vacuum pump lubrication and tappet adjustment. | ||
| View original record | contd :- -2- speeds than that obtained with the 110º camshaft, but it falls short at the lower speeds. See V.423. for full comparison. It should be noted that the power curve of the 110º camshaft was… | ||
| 02-page015 | Power curve graph for a Super Sports Engine, comparing different camshaft configurations. | ||
| View original record | V423 Power Curve with 116° Camshaft. Super Sports Engine N° SS-3. Comp. Ratio = 4.5 Claudel Hobson Carburettor Hot Spot in Action (Water at 75°C) Open Exhaust. 116° Camshaft to E77322. (N.B. Nozzle… | ||
| 02-page016 | Technical memorandum regarding new cam forms, spring pressures, and valve lift curves for various car and aero engines. | ||
| View original record | 47090 RG. BY. from R. and E. HS. c. to BJ. Wor. R2/M6.10.28. CAMS FOR F. H. and SS. X.4003 X.5060 AND 20 HP. RE. BY2/G4.10.28. X.7090 X.3822 X.5090 X.4479 Any new cam forms for valves to be fitted… | ||
| 02-page017 | From R. querying the delay on developing a longer duration cam for 'SS' engines X.7090 and X.7010. | ||
| View original record | Hs. BY. from R. c. to Wor. X7090 R5/M20.10.28. 'SS' ENGINE. X.7090 X.7010 Why can't we get on more quickly with the longer duration cam - present exhaust used as inlet - (E2/M30.8.28 - nearly two… | ||
| 02-page018 | Delay in completing drawings for S.S. Engine long duration cam forms. | ||
| View original record | R. c. Wor [Struck through] c. Hs. X7090 BY2/G.24.10.28. Hs S.S. ENGINE - LONG DURATION CAM FORMS. The drawings for these cams will be completed on Friday of this week. The calculations were finished… | ||
| 02-page019 | Approving a tested engine unit for an urgently needed chassis, with further improvements planned for subsequent units. | ||
| View original record | Hs. from R. c. to BJ. Wor. BY. +7090 R3/M19.9.28. EAC.10. X.7770 X.7090 The engine unit as tested seems quite good, enough to go kax into a chassis, which is so urgently needed. Therefore there is no… | ||
| 02-page020 | Tests and modifications to the 'SS' engine's rocker shaft lubrication system. | ||
| View original record | To BY. from Hs. c. to Wor. Hs7/LG12.11.23. X7090 'SS' ROCKER SHAFT - LUBRICATION. X7090 We have made several tests with lubricating schemes for the rocker shafts on the SS. engine and the scheme we… | ||
| 02-page021 | Sketch showing the oil restriction in the rockers for a Super Sports Engine. | ||
| View original record | V.410. R 10-11-28 .0625 DIA. ROLLS-ROYCE, LIMITED PRINT ROOM. 12 NOV 1928 DERBY. SKETCH SHEWING OIL RESTRICTION IN ROCKERS. (SUPER SPORTS ENGINE) | ||
| 02-page022 | Blueprint for a modified rocker shaft with small flats for a super-sports engine. | ||
| View original record | V453 FOR ALL OTHER DIMENSIONS SEE E77885. 16.775 .475 5.887 11.187 16.300 .500 .100 SIX FLATS THUS .812 .800 1.200 1.100 SECTION AA SECTION BB SECTION CC .093 DIA .100 (FLAT) THIS SHAFT MUST BE FITTED… | ||
| 02-page023 | Requesting modifications to the 'SS' rocker cover to incorporate changes from the latest Phantom engine. | ||
| View original record | X7090 To B. from Hs. c. to Wor. Hsll/LG12.11.28 'SS' ROCKER COVER. We should like the modification on the latest type rocker cover which has just gone into production for the Phantom applied to the… | ||
| 02-page024 | Outlining proposed changes to the 'SS' valve gear lubrication system. | ||
| View original record | Hs. from R. c. to BJ. BY. X7090 RL/M13.11.28. 'SS' VALVE GEAR LUBRICATION. X.7060 X.7090 X.7000 We would like a flood of oil at the push rod end of each rocker, and a small feed at the valve end. We… | ||
| 02-page025 | Agreement to change the 'SS' engine cam and idler wheels to a one-piece Phantom type construction. | ||
| View original record | BY. from Hs. c. to Wor. X7090 Hs2/LGL16.11.23. 'SS' CAM & IDLER WHEELS. X7090 X7130 It is agreed that the cam and idler wheels on the SS. engine shall be of the Phantom type construction i.e., one… | ||
| 02-page026 | Application of nitrifying hardening to various engine components. | ||
| View original record | BY: from R. c. to BJ. Wor. c. to Hs. X7090 RL/M19.11.28. NITRIFYING HARDENING. X.4469 X.3822 X.7060 X.4003 X.7090 The first things to try in this are the 'SS' and aero engine, valve gear followers,… | ||
| 02-page027 | Query on using copper-plating to prevent hardening on specific areas of parts during the nitrifying process. | ||
| View original record | BY. from R. Hs. 7090 R1/M22.11.28. NITRIFYING HARDENING. X.4469 X.7060 X.7090 In the above process can parts be treated so that they do not harden, say by copper-plating? The valve gear cam followers… | ||
| 02-page028 | Modifications to the rocker shaft lubrication for the 'S.S.' Phantom chassis. | ||
| View original record | To Hs. c.c. to RHC. (crossed out) c.c. to BY/Csb (crossed out) x7090 BY/CS2/DB.23.11.28. Re "S.S." Phantom - Rocker Shaft Lubrication. With reference to your memo Hs7/LG.12.11.28, re inadequate oil… | ||
| 02-page029 | Standardisation of a Phantom Rocker Cover to prevent it working loose and make an oil-tight joint. | ||
| View original record | RR 755 REVISED (10H) (D.C. 777-29-2-28) M C L.TD x7090 COMPLETED 8.12.28 STANDARDISATION of CHASSIS PARTS. Date 25.9.28 Description of Parts. PHANTOM ROCKER COVER. Origin. To prevent cover working… | ||
| 02-page030 | Form detailing information for a new chassis part, including costs and testing schedule. | ||
| View original record | STANDARDISATION OF CHASSIS PARTS IX The number of the chassis on which the new part will be fitted. H. series. Date when chassis will be handed to test. 28.1.29 Cost of scrapped material, if any. Nil.… | ||
| 02-page031 | Camshaft design, valve lift curves, and practical considerations for improving performance. | ||
| View original record | To Hs/Tsn. from E. 47090 E3/M20.12.28. CAMSHAFTS. 7090 8090 X.5090 Thank you for your Hs/Tsnl/LG12.12.28., and accompanying papers. I have not had much time to think about your suggestions yet, but… | ||
| 02-page032 | Experiments and requirements for 'SS' valve rocker lubrication. | ||
| View original record | To R. from Hs/ACL. c. to BJ. SG. c. to Wor. E. c. to DA. BY x7090 'SS' VALVE ROCKER LUBRICATION. +7060 We have experimented with several schemes for rocker lubrication on the SS. engine and the one we… | ||
| 02-page033 | Various schemes for 'SS' valve rocker lubrication and issues with cold start noise. | ||
| View original record | To R. from Hs/ACL. X7098 c. to BJ. SG. c. to WOr. E. c. to DA. BY Hs/ACL1/LG22.1.29. 'SS' VALVE ROCKER LUBRICATION. X7060 We have experimented with several schemes for rocker lubrication on the SS.… | ||
| 02-page034 | Experiments with valve rocker lubrication schemes for the 'SS' engine. | ||
| View original record | To R. from HS/ACL. c. to BJ. SG. c. to WOR. E. c. to DA. BY 'SS' VALVE ROCKER LUBRICATION. We have experimented with several schemes for rocker lubrication on the SS. engine and the one we are using… | ||
| 02-page035 | Oil leakage from a camshaft dowel screw and a proposed solution involving a new blueprint. | ||
| View original record | R. from E. C. to BJ. HS. BY. X. 7090 EB/H29.1.29 SS. CAMSHAFT DOWEL SCREW. Blueprint LeC. 2654 has been made in answer to a report that some oil leakage has been observed from these screws. All… | ||
| 02-page036 | Investigation into offsetting tappets on left-handed engines to allow for interchangeable timing gears. | ||
| View original record | R. from E. c. to BJ. HS. BY. 47090 E1/M1.2.29. X.7060 X.7772 X.7090 'SS' VALVE GEAR & LEFT HANDED ENGINE. Regarding further the question of right and left handed engines BY. has made a suggestion that… | ||
| 02-page037 | Continued discussion on tappet mechanism design, including taper pins and camshaft lubrication. | ||
| View original record | contd :- -2- There are a number of ways of doing this but we have shewn a taper pin sticking out on one side, to clear which a groove is provided in one side of the tappet guide. The hole for this pin… | ||
| 02-page038 | Discussion of design improvements for the 'SS' Valve Rocker Cover, addressing oil leaks, noise, and fastening issues. | ||
| View original record | R. from E. c.c. to BJ. HS. BY. 47090 E1/M2.2.29. 'SS' VALVE ROCKER COVER. X.7050 X.7090 We have obtained from Derby a print of what is being tested for the above, and this Esker print (Sch.1101) is… | ||
| 02-page039 | Suitability of a spring washer for 'SS' Camshaft Bearings and suggesting a sheet metal lock. | ||
| View original record | X. 7090 E. Hs. FROM R. BY. c. to Sg. Wor. R3/M3.2.29. 'SS' CAMSHAFT BEARINGS. re. LeC. 2654. Possibly the spring washer is not a suitable lock because it is not an oil seal. Would a sheet metal lock… | ||
| 02-page040 | Simplification of the engine valve rocker cover design to reduce components, cost, and noise. | ||
| View original record | E. Hs. from R. BY. c. to Sg. Wor. X7090 R1/MS. 2.29. SS. CHASSIS ENGINE VALVE ROCKER COVER. X.7090 X.7060 Four nuts and all the springs and felt that Derby suggest seems too much for this purpose. We… | ||
| 02-page041 | Use of sheet metal lock washers in place of spring washers for camshaft bearings. | ||
| View original record | R. from E c. to SG. Hs. BY. X. 7090 E2/M8.2.29. CAMSHAFT BEARINGS. LeC. 2654 We like your suggestion re. using a sheet metal lock washer in place of spring washer, and agree that it would make a much… | ||
| 02-page042 | Modifications to the S.S. rear brake camshafts and associated components. | ||
| View original record | BY. from DA. c. to SG. Hs. 7090 DA2/M9. 2. 29. S.S. REAR BRAKE CAMSHAFTS+ X. 7090 X. 7360 Herewith we send N.sch.2821 shewing the chauffeurs adjustment ends of the camshafts adopted to the EAC.14… | ||
| 02-page043 | Three potential schemes for improving the lubrication of the 'SS' valve gear. | ||
| View original record | To R. from E. c. to Sg. Hs. BY. 77090 EL/M11.2.29. 'SS' VALVE GEAR. X.7060 X.7090 With further reference to the lubrication of valve gear, especially under conditions when the car is started off from… | ||
| 02-page044 | Technical memo discussing issues and proposed improvements for the valve rocker lubrication system. | ||
| View original record | R. from E. c. to SG. Hs. BY. 77090 E1/M6.2.29. X.7060 X.7090 SS. VALVE ROCKER LUBRICATION. Regarding the above we do not altogether like the proposed small flats on the rocker shaft as they are in… | ||
| 02-page045 | Suggestion for an experiment on oil flow over the camshaft, tappet mechanism, and push rods. | ||
| View original record | contd :- -2- Amongst these latter is numbered the camshaft, and tappet mechanism and push rods. It might be an informative experiment to allow the blow off oil from the pump to flow over these, as… | ||
| 02-page046 | 'SS' valve rocker lubrication, discussing two schemes and advising to withhold parts pending testing. | ||
| View original record | To E. from Hs/ACL. c. to BY. WOR. X7090 Hs/ACL1/LG11.2.29. X7090 X7060 'SS' VALVE ROCKER LUBRICATION. We have noted the two rocker lubrication schemes shewn on Lec. 2683/4 and have put this in hand so… | ||
| 02-page047 | And comparing seven possible design schemes for the 'SS' left-hand engine. | ||
| View original record | E. Hs. from R. BY. c. to SG. Wor. RL/M15.2.29. X7090 'SS' ENGINE - LEFT HAND. X.7772 X.7090 I was sorry you did not say in your memo. which of the 7 possible schemes you preferred. To me No.7 seems… | ||
| 02-page048 | Various engine design schemes, camshaft configurations, and future development directions. | ||
| View original record | contd :- -2- Sch.3. seems the only one where all the units continue to revolve in the same hand, and therefore ought to require no alterations except to their pinions which must grow in dia. unless… | ||
| 02-page049 | Alternative drive schemes, with a reference to the Silver Ghost. | ||
| View original record | contd :- -3- which is I should feel more content if Sch.7 were adopted, but 3. or 4 are possible alternatives. So much depends upon whether Works prefer indirect drive (silver ghost). R. | ||
| 02-page050 | Urgent internal request to issue drawings and instructions for testing two 'SS' rocker lubrication schemes. | ||
| View original record | To BY. from Hs. X7090 Hs4/LG5. 3. 29. 'SS' ROCKER LUBRICATION. X 7960 We urgently want to test the two 'SS' rocker lubrication schemes shown on LeC. 2663/4. We should be pleased if you would issue the… | ||
| 02-page051 | Request to prepare 45° cams and G.76811 levers, while advising not to scrap existing parts due to an unresolved brake lining issue. | ||
| View original record | X 7090 RHC. from Hs/Rm. Hs/Rm3/T19.4.29. Will you please prepare sufficient 45° cams and levers G.76811 1.375" long to equip all the cars. We think it would be better if we did not scrap any of the… | ||
| 02-page052 | Requesting instruction for 3 camshafts for the SS, to drawing number E.77322. | ||
| View original record | X7090 To RHC. from Hs/Rm. Hs/Rm5/LG10.5.29. Will you please instruct 3 Camshafts for the SS. to E.77322 - attached. Hs/Rm. | ||
| 02-page053 | Storage of experimental braking system levers and cams for potential future use. | ||
| View original record | To RIC. from Hs/Rm. X7090 Hs/RmL/LG16.5.29. +7420 We have a number of levers and cams for the S.S. Braking system that have been tried on various experiments. Now we have for the time being… | ||
| 02-page054 | Producing improved camshaft forms for the 20 HP car, referencing related blueprints. | ||
| View original record | R. c. Sg. c. Wor. c. Hs. c. DA. X4090 BYL/G. 8.6.29. X4090 X5090 X1770 CHINA. VALVE TIMING - RE CAMSHAFT. -------------------------------- Referring to RL/M5.6.29., we had already in anticipation of… | ||
| 02-page055 | Failure of nitro-alloy camshafts during testing and querying the order of more material. | ||
| View original record | 87090. To Hs. from RHC. c. to Wor. c. to BY. RE: NITRO-ALLOY CAMSHAFTS Of the two sets of camshafts and rocker mechanism in nitro-alloy requested by Capt. Forsyth, one set has been completed and… | ||
| 02-page056 | Removal of a hard skin from Nitro-Alloy camshafts and ordering a second set for further testing. | ||
| View original record | To. RHC. c. Rg. c. Hs. c. Wop. c. H.I. 87090. BY18/N.23.10.29. Re: Nitro-Alloy Camshafts. Referring to your memo RHC1/BE.21.10.29, in regard to the Nitro-Alloy camshaft, I have discussed this matter… | ||
| 02-page057 | Investigation into the cause and remedy for a camshaft squeak. | ||
| View original record | X.7090 To Ev. from Hs/GWH. c.c. Mor. c.c. E. c.c. Sft. Mx. Hs/GWH3/AD4.11.29. RE - CAMSHAFT SQUEAK. We have been investigating a squeak that has developed in the camshaft on production cars. We have… | ||
| 02-page058 | Trial of bronze tappet guides to address a camshaft squeak. | ||
| View original record | X7090 By. from Hs/GWH. c. Mr. X. WOP. Hs4/AD6.11.29. RE : CAMSHAFT SQUEAK. We have tried a set of tappet guides made in bronze. There is no difference in the metallic ring when the engine is running… | ||
| 02-page059 | Phantom II camshaft squawks, recommending a change to solid camshafts. | ||
| View original record | BY. From Hs. c. to E. Wor. c. to Mx. 209 Hs/AJ. 2/18.2.30. PHANTOM 11 CAMSHAFT SQUAWKS. We have been carrying out a number of experiments to overcome this fault but so far we have not arrived at a… | ||
| 02-page060 | Urgent directive to stop boring Phantom II camshafts to eliminate squeaks. | ||
| View original record | E. Dept. c. Eft. c. Mx. c. Rs. c. Re/Th. 87090 BY2/G.19.2.30. PHANTOM 11 - CAMSHAFTS. Please note the Experimental Department have agreed to delete the boring up of the camshaft on the above engine.… | ||
| 02-page061 | Instructions to restrict the production of Phantom II engine tappets in Silico Manganese steel and repurpose excess material for gudgeon pins. | ||
| View original record | O.O. c. Hs. c. EH/CS 87090 BY14/G.17.3.30. PHANTOM 11 ENGINE - TAPPETS IN SILICO MANGANESE STEEL. ---------------------------------------------------- I have just heard that whilst the original… | ||
| 02-page062 | Postscript regarding a telephone call to Firths about holding a Silico Manganese steel order. | ||
| View original record | - 2 - P.S. As I was telephoning Firths to see if they had got 2% Case hardening nickel steel, I warned them in regard to the Silico Manganese asking them to hold it if they had not rolled. | ||
| 02-page063 | Ordering case hardening nickel steel for Phantom II camshafts and tappets. | ||
| View original record | C.C. c. Hs. c. RHC. c. E. x7090 BY15/G.17.3.30. PHANTOM 11 - CAMSHAFT AND TAPPET. ----------------------- I have telephoned through to Firths asking them to let us have quickly 42/ft. of 1" bar and… | ||
| 02-page064 | The dispatch and marking of steel bars for the Phantom II Camshaft and Tappet. | ||
| View original record | BY. c. to Hs. c. to RHC. x7090 ROY/RCB4/HP22.3.30. Phantom 11 Camshaft and Tappet. Referring to yours EY15/G17.3.30 we are pleased to inform you that Messrs. Thos. Firth & Sons Limited. telephoned us… | ||
| 02-page065 | The P.2. Petrol Pump, its interchangeability, and required modifications for installation. | ||
| View original record | By. from E. C. Sg. Hs. X7090 E1/M9.7.30. X.2677 X.7090 P.2. PETROL PUMP. We send here with LeC.2806 shewing the above. All the parts of the pump and driving mechanism without exception are… | ||
| 02-page066 | Investigation into noise from the rocker arms of a Phantom II camshaft mechanism. | ||
| View original record | RECEIVED AUG 23 1980 HS X7090 BY/Cgh4/G.22.8.30. Pt. c. Whr. c. Hs. c. Er. c. Hd. Phan. II - CAMSHAFT MECHANISM. With reference to Pt/PH/9.7.30. in connection with the trouble you have experienced due… | ||
| 02-page067 | 10,000-mile test on a camshaft, advising to produce 20 sets before standardisation. | ||
| View original record | X.7090 To BY. from Hs/GWH. Hs/GWH4/AD25.8.30. x7090 x7941d RE : 10,000 MILE TEST. In view of the excellent condition of the camshaft E.80598 made in 2% nickel case hardening steel as well as the… | ||
| 02-page068 | Investigation into camshaft squawks on the P.2 model, identifying the cause and proposing an improved lubrication system. | ||
| View original record | BY. FROM E. EL/M6.12.30. C. to SG. WCR. HS. C. to EP. HS/GWH. P. 2. CAMSHAFT SQUAWKS. From results of observation and experiments it has been concluded that squawks are caused by torsional shudders in… | ||
| 02-page069 | Requesting experiments on the 40/50 HP engine, specifically altering the camshaft to increase power output. | ||
| View original record | To RH6. From Hs/Rm. X7090 Hs/Rm.2/KT.12.5.31. INCREASE IN POWER OUTPUT 40/50 HP. We wish to carry out some experiments on the 40/50, altering the camshaft. We find that the base circle of the 40/50,… | ||
| 02-page070 | Outlining the timeline for the production of higher lift cams for a P.2. model. | ||
| View original record | E c. Eg. c. Wor. c. Hs. c. RHC. 8709D BY15/C.27.5.31. RE: HIGHER LIFT CAMS FOR P.2. --------------------------- With reference to E2/M23.5.31. we have discussed this matter with RHC., and he states… | ||
| 02-page071 | Power output and performance of three different camshafts. | ||
| View original record | To H. From Hs/Rm. c. to ES. Wor. c. to H. Da. c. to BY. Hs/Rh.8/KT.29.5.31. JAPAN I. POWER OUTPUT. With reference to R3/M2L.5.31. we have tested three camshafts to the forms you mention, i.e. Loc.1153… | ||
| 02-page072 | Engine performance related to camshaft timing, tappet clearance, and silencer design. | ||
| View original record | Inlet duration 235º Exhaust duration 227º T.DC. 11 112º 49 49 70 116º 54 48 Inlet Cams to Sch.1153 Exhaust Cams to Sch.1158. .013 tappet clnce. with On the other hand, any sort of silencer the power… | ||
| 02-page073 | Performance comparison graph for Twin Zenith versus standard chassis carburettors on the 'Japan' engine with various camshafts. | ||
| View original record | TWIN ZENITH CARBURETTER ON "JAPAN" COMPARISON WITH STD CHASSIS CARBURETTER. ZENITH USED WITH 26 m/m CHOKES - SMALL BORE INDN PIPE - 112° & 116° CAMSHAFTS - 5.25/1 COMPn RATIO. OPEN EXHAUST. V869… | ||
| 02-page074 | Performance graph comparing Twin Zenith and standard carburetters with 110° and 112° camshafts. | ||
| View original record | TWIN ZENITH CARBURETTER ON (JAPAN IVG6) V914 COMPARISON WITH STD CARBURETTER ZENITH RUN WITH 26"L-CHOKES SMALL BORE INDUCTION PIPE COMPLETE STANDARD 26HP EXHAUST SILENCING SYSTEM STANDARD 110° AND… | ||
| 02-page075 | Engine power test results for the Phantom II and 25HP engines, highlighting requirements for improved components. | ||
| View original record | Copy 87090. To R. From Hs. c. to Sg. Wor. c. to E. Da. c. to By. PN. Hs.4/KT.30.5.31. ENGINE POWERS. X.5090. X.7090. X.5770. X.7770. We have been able to obtain a maximum of 180 H.P. from a P.II.… | ||
| 02-page076 | Experiments for increasing horsepower on the P.2 engine. | ||
| View original record | To R. From Hs. c. to Cg. Wor. c. to S. 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… | ||
| 02-page077 | Power increasing experiments involving different carburetters and camshafts. | ||
| View original record | To R. from Hs/Swdl. c. Sg. Wor. c. E. Da. c. Hy. Hs/Swdl.1/AD3.6.31. POWER INCREASING EXPERIMENTS. Commencing from standard engine throughout running with open exhaust, we first fitted twin… | ||
| 02-page078 | Engine power tests comparing different carburetter and exhaust system configurations. | ||
| View original record | Hs/Swdl.1/ADS.6.31 contd. -2- Maximum power was finally obtained by using an Eagle IX carburetter having 1.8" dia. choke, bolted direct to the induction manifold in place of the twin carburetter. This… | ||
| 02-page079 | Graph showing power loss against engine RPM for Engine No SS-15 with various standard exhaust system configurations. | ||
| View original record | POWER LOSS TO STANDARD EXHAUST SYSTEM (S.S.) ENGINE No SS-15 (STANDARD) CURVES CORRECTED TO N.T.P. BRAKE HORSE POWER. RPM OF ENGINE. OPEN EXHAUST SWAN NECK & MAIN SILENCER REMOVED COMPLETE SYSTEM,… | ||
| 02-page080 | Graph of B.M.E.P. curves for a PII standard engine with different exhaust configurations. | ||
| View original record | CURVE 2A. PII B.M.E.P CURVES STANDARD ENGINE A TWIN CARBS. 1.300 CHOKES (COMPLETE SILENCER CUT OUT OPEN) B " " " ( " " CUT OUT SHUT) B.M.E.P R.P.M. 2/48 5.6.31 | ||
| 02-page081 | Power curve graph for a Phantom II engine comparing performance with different camshafts. | ||
| View original record | CURVE 1 PH. II POWER CURVES OPEN EXHAUST 4-6 COMP. RATIO A TWIN CARB. 1.30" CHOKES (STD COMP. RATIO)(R TYPE 110° CAMSHAFT) B " " " " ( " " ) ( STD CAMSHAFT ) B H P 150 130 110 90 70 50 30 R P M 500… | ||
| 02-page082 | Graph of Phantom II engine B.M.E.P. curves with open exhaust and 4.6:1 compression ratio, comparing camshaft types. | ||
| View original record | CURVE IA PH II B.M.E.P CURVES OPEN EXHAUST 4·6:1 COMP RATIO A. TWIN CARBS 1·3 DIA CHOKES (STD COMP. RATIO)(R TYPE 110° CAMSHAFT) B. " " " " " ( " " " ")( STD " ") A B LWS 5-6-31 | ||
| 02-page083 | Power curve graph for a 'Standard' Phantom II engine with two test conditions. | ||
| View original record | CURVE 2 P.II. POWER CURVES. 'STANDARD' ENGINE. A. TWIN CARBS. 1.300" CHOKES. COMPLETE SILENCER. CUT OUT OPEN B. " " " " CUT OUT SHUT B.H.P. R.P.M. LWS 3-6-31 | ||
| 02-page084 | Graph of four Phantom II engine power curves taken with an open exhaust. | ||
| View original record | CURVES(3) P II POWER CURVES, ALL TAKEN WITH OPEN EXHAUST (A) RR CH. EAGLE IX CARB (4.9:1 COMP RATIO) (R TYPE 110° CAMSHAFT) (B) TWIN CARBS 1.4 CHOKES ( " " ) ( " " ) (C) " " 1.3 " (STD COMP RATIO)… | ||
| 02-page085 | Graph of PII BMEP curves for various engine configurations, taken with open exhaust. | ||
| View original record | CURVE(3A) PII BMEP CURVES. ALL TAKEN OPEN EXHAUST (A) R.R.CH.EAGLE IX CARB. (4.9:1 COMP.RATIO)(R.TYPE 110° CAMSHAFT) (B) TWIN CARBS 1.4 CHOKES ( " " " )( " " " ) (C) TWIN CARBS 1.3 CHOKES (4.6:1 STD.… | ||
| 02-page086 | Outlining conclusions on camshaft design, its limitations and performance characteristics across various engines. | ||
| View original record | To E. From Hs/Rm. 8799 Hs/Rm.1/KT. 5.6.31. x5090 CAMSHAFT. With further reference to our conversation this afternoon, the conclusions we have formed on camshafts so far are as follows. We are limited… | ||
| 02-page087 | Note on determining the permissible duration of inlet valve opening for car work by referencing aero cams. | ||
| View original record | (2) We do not know what duration of inlet valve opening is permissible for car work, but hope to find out from these aero cams. Hs/Rm. | ||
| 02-page088 | Camshaft design fears and suggestions for various car work engines. | ||
| View original record | [Handwritten: X7090] HS. } FROM R. & E. BY. } Copy. R1/M5.6.31. c. to SG. WOR. RHC. CAR WORK - J.1. & P. 2. CAMSHAFTS X. 5090. X. 7090. The R. engine cam forms are the same for inlet and exhaust. We… | ||
| 02-page089 | Camshafts, compression ratios, and fuels to increase power from the P. 2 engine. | ||
| View original record | HS. ) FROM R. BY. ) R2/M5.6.31. X7090 C. to SG. WOR. RHC. re. HIGH POWER FROM P. 2. X.7090. X.7771. E. will send the technical data upon which the design of the camshaft referred to in my memo. of… | ||
| 02-page090 | Practical limits of engine design, focusing on cams and valve areas for luxury cars. | ||
| View original record | HS. FROM R. RL/M9.6.31. C. to SG. WOR. CAMS AND VALVE AREAS. X.5090 X.7090 We can only do that which is thoroughly practical, and we are giving you the best we can, P.2. and J.1., which will be a good… | ||
| 02-page091 | Requesting the preparation of valve lift curves for longer duration, higher lift cams. | ||
| View original record | YRO90 BY. FROM E. C. to SG. C. to WOR. C. to HS. E1/M10.6.31. re. P.2. LONGER DURATION HIGHER LIFT CAMS. With reference to R2/M5.6.31., we send herewith LeC. 2918., shewing particulars of valve lift… | ||
| 02-page092 | Experiments on camshafts for the Phantom II engine. | ||
| View original record | To E. From Hs/Rm. c. to By. 870.90 Hs/Rm.3/KT.12.6.31. 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 more… | ||
| 02-page093 | Engine performance testing, focusing on camshaft timing, valve design, and carburettor comparisons. | ||
| View original record | - 2 - We have checked the effect of the short duration exhaust cam with a silencer and obtained approx. the same results as with open exhaust so that we think we are right. The nearest we have tried… | ||
| 02-page094 | Technical memorandum discussing engine performance improvements with a comparison 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… | ||
| 02-page095 | Graph plotting Inlet and Exhaust Valve B.M.E.P against Engine R.P.M, showing the effect of varying tappet clearances. | ||
| View original record | SHEET 1 EFFECT OF VARYING TAPPET CLEARANCE P.V. UNIT VALVE LIFT SCH. 1065 4.9 COMP RATIO OPEN EXHAUST CAMS E.32381 INLET VALVE B.M.E.P (Axis values: 85, 90, 95, 100, 105, 110, 115) ENGINE R.P.M (Axis… | ||
| 02-page096 | Graph comparing engine performance (B.M.E.P vs R.P.M) for different inlet and exhaust valve durations. | ||
| View original record | SHEET II BEST COMPROMISE OF INLET & EXHAUST VALVE DURATIONS TWIN CARBS CAMSHAFTS TO E 32381 PH. II UNIT 4.9 COMP. RATIO. OPEN EXHAUST B.M.E.P. EX. 040 INLET 030 INLET .030 Ex. .050 INLET .020 Ex. .050… | ||
| 02-page097 | Blueprint graph comparing engine performance (B.HP vs R.P.M.) with associated valve timing diagrams. | ||
| View original record | SHEET 3 A 19 7.5 59 67 B 12 14 65.5 60 .020 CLCE. 110° SHAFT B.H.P. ENGINE R.P.M. C. I HEAD 4.9 CR. LARGE DIA: VALVES. 114° CAMSHAFT TO E.32381 R. ENGINE CAMS CLAUDEL CARB. | ||
| 02-page098 | Performance graph for a Phantom II engine with a twin carburettor, 110° camshaft, 4.9 compression ratio and open exhaust. | ||
| View original record | SHEET 4 P.II TWIN CARB 110° CAMSHAFT 4.9 C.R. OPEN EXHAUST B.H.P. 190 170 150 130 110 90 70 50 30 B.M.E.P. 130 120 110 100 90 80 70 60 A B C R.P.M. ENGINE. 500 1000 1500 2000 2500 3000 3500 | ||
| 02-page099 | Performance graph comparing a large valve cast iron head with a standard aluminum head on a PI unit. | ||
| View original record | POWER TESTS ON PI UNIT WITH 4.9:1 COMP RATIO A. LARGE VALVE HEAD (CAST IRON) B. STANDARD (ALUM) TESTS WITH OPEN EXHAUST RR-CM EAGLE & CARB. 1.800 CHOKE R TYPE 110° CAMSHAFT TO (V.1132) LARGE VALVE… | ||
| 02-page100 | Performance graph of a PI unit comparing a large valve cast iron head with a standard valve aluminium head. | ||
| View original record | V.1168 POWER TESTS ON PI UNIT WITH 4.9:1 COMP RATIO A - LARGE VALVE HEAD (CAST IRON) B - STANDARD VALVE HEAD (ALUM) TESTED WITH TWIN-CARBS 1.300 CHOKES " " OPEN EXHAUST " " STANDARD CAMSHAFT LARGE… | ||
| 02-page101 | Comparative table of engine valve specifications for various car models. | ||
| View original record | COLUMN HEADERS: Car, Displacement, Displ. /Cyl., AREA OF VALVE /LITRE (INLET, EXHAUST), VALVE LIFT (INLET, EXHAUST), AREA PAST VALVE /LITRE (INLET, EXHAUST), VALVE TIMING. TABLE DATA: Row 6: Car:… | ||
| 02-page102 | Tests on 40/50 camshafts, valve timing, and large diameter inlet valves. | ||
| View original record | To E. From Hs/Rm Hs/Rm.8/KT.17.6.31. Y7090 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 timing… | ||
| 02-page103 | Engine valve timing, lift, and camshaft modifications. | ||
| View original record | - 2 - (1) Dependant on Exhaust back pressure and on exhaust valve timing, i.e. increase exhaust valve tappet clearance roar decreased, divide exhaust manifold into 2 (Silver Ghost) no roar. Therefore… | ||
| 02-page104 | Blueprint graph comparing different engine timing configurations found by experiment. | ||
| View original record | COMPARISON OF TIMING APPROXIMATING TO L.E.C. 2918 & BEST TIMING FOUND BY EXPERIMENT HS 379 H. 379 A TIMING APPROX. TO L.E.C. 2918. 1/4" SHAFT B BEST TIMING R. ENGINE, CAMS 110° SHAFT C AS 'B' BUT… | ||
| 02-page105 | Blueprint graph comparing the performance of large versus small valves. | ||
| View original record | Hs. 380 COMPARISON LARGE & SMALL VALVES 4.9 C.R. 114° R CAMSHAFT OPEN EXHAUST, SINGLE CLAUDEL CARB. B.H.P. B.M.E.P. R.P.M. EX IN 12 14 50 65.5 BASE OF SEAT DIA. INLET EXHAUST LARGE VALVES 2.1" 1.95… | ||
| 02-page106 | Blueprint showing desirable camshaft timing diagrams for the 40/50 model. | ||
| View original record | DESIRABLE CAMSHAFTS FOR THE 40/50 ALL TIMINGS .073" CLCE Diagram 1: 112° 25 H.P. INLET23D EX.240 Numbers: 1, 0°, 11°, 49, 49 Diagram 2: 116° 40/50 LIFT .420 IN.226 EX.241 Numbers: 2, 5-5°-6, 53.5, 52… | ||
| 02-page107 | Modifications to the rockers to increase the valve lift for a 40/50 model. | ||
| View original record | To By. From Hs/Rm. 87090 Hs/Rm.7/KT.18.6.31. 40/50 VALVE LIFT. On the new cams which W.W. have given us, we shall have a lift of .480 We can get some very useful results by running our existing… | ||
| 02-page108 | Timing and camshaft modifications on the Phantom II and 25 HP models, detailing power curve increases. | ||
| View original record | 87090. To E. From Hs/Rm. Hs/Rm.6/KT.22.6.31. TIMING AND CAMSHAFTS ON P.II. Herewith power and M.E.P. curves for the 114º camshaft on the P.II. We find that with a 112º camshaft on the 25 HP. we get an… | ||
| 02-page109 | Desire to produce a new higher lift camshaft for the P.2 engine. | ||
| View original record | BY RHC. } FROM E. C. to SG. WOR. C. to HS. X7090 E2/M23.5.31. re. HIGHER LIFT CAMS FOR P.2. It is desired to produce a camshaft for P. 2. using 2 new cam forms of .050 greater camlift, which it is… | ||
| 02-page110 | Technical memorandum discussing tests and comparisons of engine timing and camshaft performance, with timing diagrams. | ||
| View original record | 87090 To E. From Hs/Rm. c.c. to Hy. TIMING AND CAMSHAFTS. We have made some more tests with the 1140 R. engine cam form camshaft. Ms.403 shews that we can pick up some of the low speed M.E.P. with an… | ||
| 02-page111 | Camshaft design alterations to improve engine performance and valve timing. | ||
| View original record | - 2 - The only alteration we would suggest is that having proved we can gain in low speed M.E.P. by altering the point of the exhaust valve opening to 45° B.B.C. we ought to try a shaft having this… | ||
| 02-page112 | Performance comparison graph of 110° and 114° camshaft timings, showing B.H.P and B.M.E.P against R.P.M. | ||
| View original record | BEST TIMING 110° SHAFT COMPARED WITH BEST TIMING 114° SHAFT CAM. FORMS E.32381 4.9 C.R. OPEN EXHAUST TWIN CARBS. 1.4 CHOKES. ALUM. HEAD. STD. VALVES INLET 2.0" EX 1.85" .020 CLCE STD CAMSHAFT SAME… | ||
| 02-page113 | Performance graph showing Brake Horse Power and Brake Mean Effective Pressure against RPM for specific engine timings and configurations. | ||
| View original record | B.H.P 30, 50, 70, 90, 110, 130, 150, 170, 190 R.P.M. 500, 1000, 1500, 2000, 2500, 3000, 3500 B.M.E.P 50, 70, 80, 90, 100, 110, 120 BEST TIMING. 114° R.CAM. CAMSHAFT C.I. HEAD 2 1/4" DIA. VALVES SINGLE… | ||
| 02-page114 | Progress and fitting of a new camshaft for a Phantom II engine. | ||
| View original record | 87090 To RHC. From Hs/Rm. Hs/Rm.10/MJ.6.7.31. NEW CAMSHAFT FOR PHANTOM 11. W.W. were enquiring about this shaft on Friday last and said that the Lec. was received on 11.6.31. The D.O. say that they… | ||
| 02-page115 | Data tables comparing valve train component specifications and performance characteristics for the 25HP.JAPAN engine. | ||
| View original record | Top Table: Engine: 25HP.JAPAN Model: P.II. Columns: Wt. of tappet etc. | Tappet spring. | Force on cam at 3000 RPM. | suction of valve. | valve bounce speed. Row 1: 284 lbs | 5 lbs | 5 + 252 = 335 lbs… | ||
| 02-page116 | Technical memo discussing the effects of a long duration camshaft on engine performance. | ||
| View original record | X7090 HS. BY. E.} FROM R. R1/M21.7.31. C. to SG. WOR. RG. P. 2. LONG DURATION CAMSHAFT X.7090. X.7230. This confirms previous experience that our standard is good for ordinary use, but as it is would… | ||
| 02-page117 | Request to manufacture two modified camshafts to test increased power output. | ||
| View original record | To RHC. From Hs/Gry. Hs/Gry.2/MJ.21.7.31. 7090 P.11 Increased Power Output. We wish to try the accompanying camshaft in conjunction with masked valves and high lift rockers. Will you please therefore… | ||
| 02-page118 | Diagram showing the arrangement and profiles for a PII left-hand inlet and exhaust camshaft. | ||
| View original record | CAMSHAFT . PII L.H. INLET & EXHAUST [112°] STAMP: [ROLLS-ROYCE LIMITED PRINT ROOM DERBY 30 JUL 31] CAMSHAFT DIMENSIONS TO E 80070 EXHAUST CAM LEADS INLET CAM BY 112° CENTRAL DIAGRAM: C of KEYWAY… | ||
| 02-page119 | Technical drawing of a masked inlet seat component for the PII model. | ||
| View original record | ROLLS-ROYCE LIMITED, PRINT FROM, 21 JUL 31, DERBY, MASKED INLET SEAT — PII, OTHER DIMENSIONS TO E 77348, UNFRELT REQ'D, N.P. x 2.106 DIA .10, .025 CHAMFER AT 45°, 60°, 3/16, .010, 2.245 Dia, .85, .55,… | ||
| 02-page120 | Test report on the High Power Camshaft P.II, comparing its performance against a 25 HP engine. | ||
| View original record | To R. from Hs/Rm. c. Sg. Wor. c. Da. E. c. Ev. 87090 Hs/Rm2/AD5.8.31. HIGH POWER CAMSHAFT P.II. We have now run a number of tests on the new 120º camshaft to Lec.2918. The best power we have so far… | ||
| 02-page121 | Engine performance improvements via tests on valve lift ratios, cam angles, and camshaft designs. | ||
| View original record | Hm/Rm2/AD5.8.31. contd. -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.… | ||
| 02-page122 | Tabulated list comparing valve opening specifications across various engine types. | ||
| 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 | 2.20 R. engine | 1.950 |… | ||
| 02-page123 | Performance graph showing engine power output and induction pipe depression against RPM for a long duration camshaft test. | ||
| View original record | CURVE I POWER OUTPUT LONG DURATION CAMSHAFT. CHINA UNIT 3.25 BORE. 116° CAMSHAFT 5-1 C/R ZENITH TRIPLE DIFFUSER CARB ON EXHAUST SIDE OF BLOCK B.H.P./LITRE 23.6 B.H.P. R.P.M. INDUCTION PIPE DEPN INS /… | ||
| 02-page124 | Performance graph showing the effect of increasing valve lift on a China engine. | ||
| View original record | CURVE II EFFECT OF INCREASING VALVE LIFT ON CHINA ENGINE ENGINE UNIT C9 CHINA. ACCURATE C/R 5.35-1 SINGLE S.V. 1 5/8" CARB. OPEN EXHAUST 110° SHAFT. INDUCTION PIPE DEPRESSION. INS / Hg. B.H.P. R.P.M.… | ||
| 02-page125 | Performance graph showing the effect of increased valve lift on the 'Japan Engine'. | ||
| View original record | R. P. M. B.M.E.P. B.H.P. INCREASE IN PEAK POWER DUE TO HIGHER LIFT 6 1/2% STD VALVE LIFT .344 INCREASED VALVE LIFT .395 TIMING .020" TAPPET CL'CE VALVE TIMING DIAGRAM: IN 43, EX 43, 5, 7 CURVE III… | ||
| 02-page126 | Performance and silencing of the West Wittering 120° camshaft for the P.2 engine. | ||
| View original record | Y7090. To E. from Hs/Rm. Hs/Rm4/AD5.8.31. WEST WITTERING 120° CAMSHAFT FOR THE P.2. We send you herewith a curve showing a comparison between the standard camshaft, camshaft for the R. engine cams and… | ||
| 02-page127 | Power curves and valve timing diagrams for a Phantom II engine, comparing 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. " " " " " B.H.P. R.P.M. M.E.P. lbs/sq… | ||
| 02-page128 | Instruction to experimentally test a 5 1/4 - 1 compression ratio on the P.2 engine with a long duration camshaft. | ||
| View original record | 87090. Ey. from Hs/Rm. c. Wor. Hs/RMA/AD6.8.31. R. has instructed on the telephone that he would like us to use 5 1/4 - 1 compression ratio on the P.2. in conjunction with his long duration camshaft.… | ||
| 02-page129 | The results of tests on 114° camshafts and valve timing. | ||
| View original record | To R. From Hs/Rm. c. to SE. Wor. c. to L. Dx. c. to By. 87090 P.11 114° CAMSHAFTS. LeC.2918. We have now completed a series of tests on camshaft for forms LeC.2918. Curve Hs/Rm. P.17 shows power… | ||
| 02-page130 | Blueprint graph comparing performance characteristics for various camshaft timings. | ||
| View original record | RM P17. COMPARISONS VARIOUS TIMINGS W.W. 114. CAMSHAFT. 4.75 C.R. SINGLE CLAUDEL CARB. OPEN EXHAUST. 21/8/31 B.H.P. Timing Diagram 1: IN EX 10.4 5.2 51 62 .013 TAPPET CLCE CAMSHAFT LEC 2918 Timing… | ||
| 02-page131 | Performance comparison graph for 120° and 114° camshafts. | ||
| View original record | COMPARISON W.W. 120° & 114° CAMSHAFTS. RM P18 21/8/31 4.75 CR PD UNIT ① I.O. 3° B.T.C E.O. 54° B.B.C. CLAUDEL I.C. 58° A.B.C. E.C. 12° A.T.C. E82448 ② I.O. 2.5 P.T.C. E.O. 63.2 B.B.C. CLAUDEL I.C.… | ||
| 02-page132 | Record of a telephone conversation regarding camshaft specifications for 20/25 HP, Phantom II, and Continental Phantom II models. | ||
| View original record | COPY. 87090. E. HS. BY/Crh. BY/SS. X.5090. X.7090. X.7120. BY./G.4.9.31. TELEPHONE CONVERSATION BETWEEN WEST WITTERING AND BY. - FRIDAY 4TH. SEPTEMBER 1931. --- 20/25 HP. CAMSHAFTS. --- E. confirms… | ||
| 02-page133 | Power output tests for the Phantom II engine, analysing the effects of camshaft and inlet valve modifications. | ||
| View original record | To R. from HS/Rm. c. Sg. c. Wor. E. c. Ds. Py. 87090 Hs/Rm.1/AD18.9.31. POWER OUTPUT P.II. x7771 Attached are the results of a number of tests on the P.II to obtain the best power output with the W.W.… | ||
| 02-page134 | Technical memorandum discussing the effect of different valve sizes, camshafts, and carburetter settings on engine power. | ||
| View original record | -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. 114° camshaft to L.82448 used with the best timing. Rm.… | ||
| 02-page135 | Summary of conclusions on car engine performance, focusing on valve timing, cam design, and valve specifications. | ||
| View original record | HS.) FROM R. BY.) C. to SG. WOR. E. CAR ENGINE PERFORMANCE. X7090 R/M28.9.31. X.5090. X.7090. At the moment the following conclusions have been agreed to: (1) That large inlet valves with ample… | ||
| 02-page136 | Performance graph comparing a twin carburettor induction system with a standard A1 carburettor system. | ||
| View original record | TWIN R.R. CARBS AND INDUCTION SYSTEM COMPARISON WITH STANDARD A1 CARBURETTOR AND INDUCTION SYSTEM TEST BED EXHAUST SYSTEM V1023 BHP BMEP RPM TWIN CARBS 1.35 DIA CHOKES TWIN CARBS 1.30 CHOKES TWIN… | ||
| 02-page137 | Performance graph comparing large and small valves. | ||
| View original record | RM. P.15 COMPARISON OF LARGE & SMALL VALVES 4.78 C.R. W.W. 1 1/4" SHAFT LE G.2818 OPEN EXHAUST NS. DEPN. 3000 R.P.M. LARGE VALVES C DENOTES CLAUDEL 1.90 T TWIN CARB. 1.4 DIA. CHOKE 2.55 B.H.P.… | ||
| 02-page138 | Performance graph comparing different valve lift timings and settings against engine RPM. | ||
| View original record | COMPARISON OF VALVE LIFT 114° SHAFT RM. P.19. LARGE VALVE HEAD. 4.78 C/R 2.0" VALVE THROAT 114° CAMSHAFT E.82448 OPEN EXHAUST TIMING .013 C.L.C.E. TWIN CARBS 14 THROATS I.O. 3° B.T.C. E.O. 54° B.B.C.… | ||
| 02-page139 | Graph comparing engine performance using high lift rockers with different valve lifts and carburettors. | ||
| View original record | COMPARISON OF HIGH LIFT ROCKERS RM. P.20 SMALL VALVE HEAD 476 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… | ||
| 02-page140 | Graph showing the effect of increased valve lift on engine performance at various RPMs. | ||
| 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 B.H.P. R.P.M. B.M.E.P LBS/SQ INDUCTION… | ||
| 02-page141 | Graph comparing engine performance based on various inlet valve durations and lift profiles. | ||
| View original record | COMPARISON OF VARIOUS INLET VALVE DURATIONS RM. P.23 4.78 C/R. OPEN EXHAUST STD. ALUM HEAD RR TWIN CARBS 1-4" CHOKES 1-3 DIA VALVE THROAT B.H.P. R.P.M. INDUCTION DEPN lbs/sq in. M.E.P. LBS/SQ in. .013… | ||
| 02-page142 | Performance graph comparing valve sizes and carburetor setups for a Phantom II engine unit with an open exhaust. | ||
| View original record | COMPARISON OF VALVE SIZES W.W. 114° CAMSHAFT RM P.24 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 .013… | ||
| 02-page143 | Interpretation of performance curves for masked inlet valves based on different timings. | ||
| View original record | 17090 To E. from Hs/Rm. Hs/Rm.1/KT.31.10.31. MASKED INLET VALVES. Further to Hs/Rm.1/KT.29.10.31. Our interpretation of curves Rm.P.30 & Rm.P.31 is as follows:- Both A. timings show poor low speed… | ||
| 02-page144 | Use of long-toed cams to manage tappet clearance for engine silencing. | ||
| View original record | Y*090 HS. FROM R. R4/MS.11.31. Sent off 19.11.31. C. to SG. WOR. BY. TAPPET CLEARANCE. X.7090 X.5090 For very many years we have tried to introduce a long toed cam as a means of getting silence for… | ||
| 02-page145 | Tests on engine tappet clearance and the resulting noise levels. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Wor. c. to By. 8709a Hs/Rm.3/MJ.24.11.31. TAPPET CLEARANCE. x5090 With reference to R.4/M16.11.31. We have made some tests on tappet clearance and noise. With the existing… | ||
| 02-page146 | Graph 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: 4.75 C/R. STD ALUM. HEAD 1.9 VALVE THROAT VALVE LIFT .430 VALVE LIFT .480 .013 CLCE… | ||
| 02-page147 | Blueprint drawing for an inlet valve with dimensional tolerances. | ||
| View original record | Hs 372 .450R -5° .225 CHAMFER AT 45° ±2° 1.830 DIA ±.2 30° ±1/2° OTHER DIMENSIONS TO E78433 INLET VALVE [30° SEAT CARB'L 3/10] PII 1.500 DIA ±.10 1.686 DIA. ±.2 | ||
| 02-page148 | Proposed Brooklands test to compare camshaft and compression ratio improvements on the Continental P.2. car. | ||
| View original record | 87090. To PN. from Hs/Rm. Hs/Rm.7/AD5.10.31. X.7120. BROOKLANDS TEST. X.7090. As you are aware, Sg. is anxious that we should standardise some improvement for the Continental P.2. car. So far the only… | ||
| 02-page149 | Power output difference between balanced and unbalanced twin carburettors. | ||
| View original record | To R. From Hs/Rm. C. Eg. Wor. C. Ds. S. Ev. BALANCED TWIN CARBURETTERS. We send you herewith curve Rm.P30 showing the difference in power output of the twin carburettors balanced and unbalanced. The… | ||
| 02-page150 | Graph comparing the power output of balanced versus unbalanced twin carburettors. | ||
| View original record | COMPARISON OF POWER OUTPUT BALANCED & UNBALANCED TWIN CARBS. STANDARD CAMSHAFT VALVE LIFT .480 STANDARD HEAD 4.78 C.R TWIN CARBS 1 1/4 CHOKES EX IN .013 CL'CE 75 55 5 B.H.P. B.M.E.P. R.P.M. NORMAL… | ||
| 02-page151 | The results of tests conducted on masked inlet valves. | ||
| View original record | To R. from Hs/Ru. c. to SG. Wor. c. to K. Da. c. to Ly. 7090 MASKED INLET VALVES. With reference to your suggestion that it would be worth trying slightly masked inlet valves, we have carried out a… | ||
| 02-page152 | Report page discussing the results of engine testing related to valve lift, clearance, and 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 114º shaft A. shewed that if the exhaust valve clearance was… | ||
| 02-page153 | Performance comparison chart of masked versus unmasked camshafts with different lift rockers. | ||
| View original record | RM P 30. COMPARISON OF 108° MASKED CAMSHAFT AND 114° E82448 UNMASKED CAMSHAFT OPEN EX. C/R 4.7 HIGH LIFT ROCKERS TWIN CARBS 1.4 CHOKES MASKED CAMSHAFT INLET LIFT .547 EXHAUST .469 B.H.P. R.P.M.… | ||
| 02-page154 | Performance comparison graph of a 112° masked camshaft and a 114° unmasked camshaft, plotting B.M.E.P. against R.P.M. | ||
| View original record | R.M.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 .469 114° SHAFT E.62448… | ||
| 02-page155 | Results of exhaust system loss tests conducted using a 114° camshaft. | ||
| View original record | X7090 Hs/Sa.4/A.2.12.31. X7330 X7090 M Hs/An. c. to Sg. Or. c. to A. Da. c. to Sy. EXHAUST LOSSES 114° CAMSHAFT. We have now repeated the tests of the exhaust system losses using the 114° camshaft to… | ||
| 02-page156 | Performance graph comparing manifold only, cut-out open, and full exhaust systems. | ||
| View original record | COMPARISON OF MANIFOLD ONLY, C.O OPEN & FULL EXHAUST SYSTEM P.II COMPLETE SHORT TYPE EXHAUST SYSTEM 114° CAMSHAFT TO E82236 4.65 C/R STD. CYL HEAD. 1.9" VALVE THROAT MANIFOLD ONLY R.R TWIN CARBS. 1.4"… | ||
| 02-page157 | Analysis of a short type exhaust system, comparing performance with different components. | ||
| View original record | ANALYSIS OF EXHAUST SYSTEM SHORT TYPE RM.P.42 30/11/31 P.II No. 5 114° CAMSHAFT TO E.82233 4.65 C/R. STD. CYL. HEAD 1.5 VALVE THROAT R.R. TWIN CARBS. 1.4 DIA. CHOKES. ① MANIFOLD ONLY ② " + FRONT EXP.… | ||
| 02-page158 | Summary of two development tests carried out on a 114° camshaft. | ||
| View original record | X7090 FROM HS/Sn. c. to Mr. WPr. c. to Mr. H. Da. c. to SY. HS/Sn.2414.7.1.41. PII DEVELOPMENT WORK 114° CAMSHAFT. We carried out two tests on this Camshaft. (1) R.M.P.37. This test was to determine… | ||
| 02-page159 | Performance graph comparing a 114° camshaft with a twin inlet cam and camshaft configuration. | ||
| View original record | RM. P.37 27/11/31 DIRECT COMPARISON OF 114° CAMSHAFT WITH TWO INLET CAMS AND CAMSHAFT TO LE C.2918 E 82448 TWIN CARBS. 1.4 CHOKES. OPEN EX. MAN. ONLY. HIGH LIFT ROCKERS C/R 4.65-1 NORMAL To LEC2918… | ||
| 02-page160 | Performance graph comparing high and low lift rockers on a 114° Camshaft E 82448. | ||
| View original record | RM. P.38 COMPARISON OF HIGH AND LOW LIFT ROCKERS ON THE 114° CAMSHAFT E 82448 TWIN CHOKE CARBS 1·4 CHOKES OPEN EX: MANIFOLD ONLY C/R 4·65-1 STD: CYL: HEAD AND VALVES 1·9 VALVE THROAT B.H.P B.M.E.P… | ||
| 02-page161 | Engine power development, focusing on valve timing, lift, and supercharger application. | ||
| View original record | E. HS. } FROM R. BY. } (At Le Canadel) x7090 R2/M6.1.32. Sent from WW. 9.1.32. X5090 X7090 X4553 C. to - SG. WOR. RG. CAR WORK - ENGINE POWER. Good and sound progress is being made and I quite agree… | ||
| 02-page162 | Technical memorandum discussing cam forms and valve timing for J.III and Peregrine engines, comparing theoretical values with test results and Alfa Romeo designs. | ||
| View original record | -2- Hs/Rm.2/A.18.4.32.contd. With regard to the cam form. We notice that the Alfa inlet valve is opening very rapidly, more so than ours between .013 and .020 lift. Cannot we copy this. Also can we… | ||
| 02-page163 | Summary of existing camshafts for various engine models showing their timing and duration. | ||
| View original record | SHEET 1 ALL DURATIONS ACTUALLY BY TEST BED MEASUREMENT SUMMARY OF EXISTING CAMSHAFTS P I J II 25 H.P ALFA ROMEO 27 TO 8 INLET 233 EXHAUST 230.8 DIAGRAM 1: IN 40, EX 55.5, .020 CLCE 112° EXP. CAMSHAFT… | ||
| 02-page164 | Blueprint comparing three cam forms and four alternative engine valve timings. | ||
| View original record | SHEET II JAPAN III T.D.C 8° EX 48 IN 45° .020 CLCE TOE OF INLET CAM TO BE SHORTENED AS FAR AS POSSIBLE INLET DURN 228 EXHAUST DURN 233 110° SHAFT PEREGRINE 3 8 EX 45 IN 42 .020 CLCE INLET DURN =… | ||
| 02-page165 | Standardisation of a 114º long duration camshaft with stronger tappet springs. | ||
| View original record | RR 758 (10H) (30405, 21-4-32) BM. 3/6382/4. X1090. COMPLETED 29.11.32. STANDARDISATION of CHASSIS PARTS. Date 6.9.32. X No. 7090 Drawing E. No. 82448 Part No. HS. 502 List Description of Parts. 114º… | ||
| 02-page166 | Standardisation of chassis parts form. | ||
| View original record | STANDARDISATION OF CHASSIS PARTS The number of the first chassis on which the part will be fitted................. 1st Series. Date when chassis will be handed to test.......... Nov. 26th. 1932. Cost… | ||
| 02-page167 | Optimal timing specifications for a new camshaft, part number E.82448 1140, including a timing diagram. | ||
| View original record | By. From Hs/Rm. c. to E. c. to MX. Hs/Rm.6/MA.13.12.32. TIMING NEW CAMSHAFT E. 82448 1140. We have established that the best results are obtained with a timing (measured with .020 tappet clearance)… | ||
| 02-page168 | Request to manufacture two types of camshafts for the 40/50 model. | ||
| View original record | X7090 RHC. from Hs/Gry. Hs/Gry.13/KT.17.3.33. CAMSHAFT 40/50. Will you please make fo us a camshaft to the attached Hs.961; and also one with both inlet and exhaust cams to the inlet cam of Hs.961,… | ||
| 02-page169 | Blueprint detailing the cam lift specifications and dimensions for an 8 Litre Phantom camshaft. | ||
| View original record | HS 961 MOD TO E.82448 CAM LIFT VALVE OPENING NO. 0 0 1 .000111 2 .000447 3-43 SEE E82278 44 .358 44 1/2 .358 CAM LIFT VALVE CLOSING NO. 90 0 n SEE ON (n-3) E.82278 48 .356035 47 .357548 46 .358 45… | ||
| 02-page170 | Cause and proposed solution for a camshaft squawk on the Phantom II engine. | ||
| View original record | Rm x7090 To WOR. from E. E.7/HP.9.10.33. c. Hs. By. Sft. Mx. EP. Hd. x670t. re Camshaft Squawk on P.II. We have issued some roller tappets on the engine for the Vulture chassis to LeG.3664 in place of… | ||
| 02-page171 | Modification to a tappet fork to address camshaft squawks, re-issuing a related document and referencing a previous memo. | ||
| View original record | To BY. from E/JNR. c. Hs. RHC. 17090 E/JNR.4/HP.8.12.33. P.2. Camshaft Squawks. We re-issue to you LeC. - 3664. We have made a slight modification to the tappet making the section stronger at the… | ||
| 02-page172 | Cause and potential solution for knocks in Phantom II engines. | ||
| View original record | x7090 To Mr. BY. HS. KP. MX. BR. from E. E.12/HP.16.12.33. Knocks in Phantom II Engines. Your memo Hd20/MW.15.12.33 confirms our conversation re chassis 106-MY and our proposal to reduce the camshaft… | ||
| 02-page173 | Technical memo proposing a reduction in the camshaft end clearance for the Phantom II and other chassis. | ||
| View original record | BY/CS. Sft. Mmr. C.P. C. Hs. C. Hc. C. IP. C. WGT. c. DL/AW. X709 BY.4/G.18.12.33. END CLEARANCE OF CAMSHAFTS PHANTOM II. and OTHER CHASSIS. The reason why in the past we have specified a clearance of… | ||
| 02-page174 | Feasibility and testing of a balancing cam for the Phantom II car. | ||
| View original record | X 7090 To WCR. from E/Lid. c. Ss. Hs. By. Sft. Da. HDY. E/JNR. re Balancing Cam - Phantom II. After further investigation into this modification, we find that it will not be possible at the moment to… | ||
| 02-page175 | Accuracy of camshaft manufacture, suggesting the measurement of a specific cam form to check for inaccuracies. | ||
| View original record | x 7090 To RHC. Hs/Rm:14/KW.20.6.34. Accuracy of Camshaft Manufacture. We think we have rather a good opportunity of checking over cam forms. It should be a great deal easier to detect inaccuracies on… | ||
| 02-page176 | Issues with a No. 4 inlet valve and requesting a new camshaft for a Ph.II engine. | ||
| View original record | To RHC. x7090 HS/Smth.11/KW.25.6.34. Camshaft for Ph.II. We have found that No. 4 inlet valve gives trouble at lower speeds than the others when the engine is fitted with Cadillac automatic tappets… | ||
| 02-page177 | Requesting a new camshaft with corrected forms for two cams following tests on hydraulic tappets. | ||
| View original record | To RHC. X7090 Hs/Smth.18/KW.5.9.34. Now that we have more experience of hydraulic tappets we are anxious to resume tests with the E. 82448 camshaft. It may be remembered that there were considerable… | ||
| 02-page178 | Standardisation of parts for the old camshaft to E.80070 to increase valve gear silence. | ||
| View original record | RR 755 (5H) (57312. 29-12-33) BM 3/640/2 COMPLETED 26.9.34. 40/50 STANDARDISATION of PARTS. Date: 25.7.34. (Handwritten above: 6-9-34) X No. 7090. Drawing No. Part List Description of Parts. OLD… | ||
| 02-page179 | Nil estimated cost of extra jigs, tools, and equipment for a specific instruction. | ||
| View original record | STANDARDISATION of PARTS X Est. cost of extra jigs, tools and equipment NIL. Is already instructed for 51 in 'T' without scrap. [Text on faint stamp and handwriting over it]: A.I.D. 19398/39 | ||
| 02-page180 | Graph of Brake Mean Effective Pressure curves comparing various Cadillac and Rolls-Royce products. | ||
| View original record | G.M.C. CORRECTION TO 103 °F. BRAKE MEAN EFFECTIVE PRESSURE CURVES CADILLAC & ROLLS-ROYCE PRODUCTS LBS/SQ. IN. B.M.E.P. DEGREES H.P. R.P.M. (÷ 100) CURVE LABELS: SIXTEEN DUPLEX CARB DOWNDRAUGHT 6.49… | ||