Rolls-Royce Archives
| Identifier | Entry | ||
| Scan001 | Arrangements and requirements for a preliminary run of the International Alpine Trial. | ||
| View original record | To Hs. from Sg. re International Alpine Trial. Sg6/EL3.6.32 I hear from Wor. that arrangements have been made for Hancock to accompany Mr.Pass on his preliminary trial. I enclose book of the… | ||
| Scan002 | Preparations for the International Alpine Trial. | ||
| View original record | Hs GWH To Hs. from Sg. Re International Alpine Trial. Copy to Wor. [Strikethrough] Sgl/E17.6.32 Referring to former memoranda, Mr.Pass is still expecting to get away at the latter part of next week… | ||
| Scan003 | Preparations for the International Alpine Trial, focusing on the challenges of the Stelvio Pass and vehicle logistics. | ||
| View original record | PER BAG. To Sg. From Hs. c. to Wor. Hs.2/MJ.17.6.32. Re. International Alpine Trial. We have looked over the conditions of trials and consider the most doubtful point is the Stelvio Pass. The last… | ||
| Scan004 | Arranging collection of a car from coachbuilders for the International Alpine Trial. | ||
| View original record | Hs To Hs. from Sg. re International Alpine Trial. Sg/17/E20.6.32 [Text struck through: Copy to Mr.] p Referring to my Sg1/E17.6.32 Mr Pass hopes to get hold of the car fxin from the coachbuilders… | ||
| Scan005 | The performance test of car 28-MS at Brooklands Track for the Austrian Trials. | ||
| View original record | c. Hs. re. 28-MS. Mr. Pass. (For use Austrian Trials). I had arranged to test the above car when completed in London, but I was not able to be away from the Works on the day on which the car was ready… | ||
| Scan006 | Memo from G.W.H. to Hs. regarding the cancellation of a trial with the Phantom car. | ||
| View original record | To Hs. from G.W.H. Reims 1/7/32 Mr Pass telegraphed Sg to day saying that he had given up the idea of the trial with the Phantom. The sole reason is that the bar is too large for the boxes on the… | ||
| Scan007 | Letter regarding modifications to a 20-G4 vehicle, including axle and wheel changes, in preparation for the Alpine Trial. | ||
| View original record | HS HS Your job I fancy S/W. (c. to EP) re- Alpine Trial. RECEIVED 5 JUL 1932 eso 2/KW 2 Cx16/W.1.7.32. You will have heard from Sg. that Mr.Pass finds the 40/50 h.p. chassis unsuited for this trial,… | ||
| Scan008 | Modifications to car 20-G4, including springing and steering, for the International Alpine Trial. | ||
| View original record | [Handwritten]: HS [Handwritten]: also see Ex16/RW1722 [Handwritten]: S/W. [crossed out] [Handwritten]: (c. to E?) [Typed]: re- 20-G4. [Typed]: Cx2/KW.2.7.32. [Typed]: It occurred to me after I had… | ||
| Scan009 | Cable report on the performance of a 40/50 car during Alpine trials and considerations for future vehicle selection. | ||
| View original record | Hs To Ior. from Sg, re Alpine Trials. Sg15/EL.7.32 Copy to C. Hs. EP. P.H.S. You will be interested to know that I have received a cable from Mr.Pass, who, as you know, left England last week-end to… | ||
| Scan010 | Report detailing the failure of a Phantom vehicle on the Stelvio Pass due to its turning circle. | ||
| View original record | SG. WOR To Hs. from G.W.H. Boulogne 2/7/32 We arrived here this evening. Mr Pass crossed over by the 7 o'clock Boat. I am leaving for Paris in the morning and have arranged for Roberts to pick me up… | ||
| Scan011 | Opinion on the severity of a test for the 25H model, outlining risks and required specifications for brakes and acceleration. | ||
| View original record | amount of money to carry off the prize. He is rather keen upon trying the 25H., but in my opinion the test is too severe and the risk of failure too great for the 25H to compete, without experience.… | ||
| Scan012 | Required component upgrades including water pump, clutch, and suspension for a trial. | ||
| View original record | 3 To Hs. from G.W.H. The latest water pump would be needed to prevent loss of water at high speed. The clutch is given very severe work and with the exact honest gears I think it would fail with the… | ||
| Scan013 | Car's road holding, springing, and lighting performance. | ||
| View original record | 4 TO BH FROM H.W.O road to off Passes liking. I have ridden in the back of the whole of the tour and can say, for the speed and cornering I've never rode in a Derby Phantom with smoother riding and… | ||
| Scan014 | Report discussing excessive engine oil loss when climbing passes and explosions in the silencer. | ||
| View original record | HOTEL DE LA COURONNE RHEINFELDEN TÉL. No. 23 Page 5: Attention must be made with regard to the rear bearing of the engine. Too much oil is lost when climbing the passes the Hatchberg is very bad for… | ||
| Scan015 | Test report detailing fuel consumption, driving conditions in Switzerland, and speed restrictions during a road trial. | ||
| View original record | journey. It so happened that the consumption was very small, I have not had to replenish, apart from the extra I put in the second day throughout the run which has worked out at 2000 miles. For the 25… | ||
| Scan016 | Car's suitability for the Alpine Trials, specifically the 20-G4 model. | ||
| View original record | To Sg. From Hs/Rm. c. to Wor. Hs/Rm.3/MJ.2.7.32. RE. ALPINE TRIALS. Replying to Sg.15/E.1.7.32. We have reports from Hancock which indicate that the size of the car is not the only difficulty on this… | ||
| Scan017 | Query to Hancock regarding the success of the 25 HP vehicle in the Austrian trials. | ||
| View original record | 4.7.32. Hancock, Hotel de France, Chateauroux, Indre, France. Do you consider 25 H.P. would go through Austrian trials successfully. Hives. | ||
| Scan018 | Telegram confirming required vehicle modifications including ribbed brakes, strong road springs, and shock dampers. | ||
| View original record | POST OFFICE TELEGRAPHS. B or C Charges to pay TIME OF RECEIPT: 3 38 M From: lois Telegrams for INLAND addresses may be handed to the messenger who delivers this form. The Post Office accepts telegrams… | ||
| Scan019 | Suitability of the Phantom II and 25 HP cars for the Alpine Trials, based on reports from Hancock. | ||
| View original record | To Eg. from Hs. c. Wor. ALPINE TRIALS Attached herewith are copies of two reports from Hancock. It is evident that the P.II car would not successfully go through this trial. We have asked Hancock his… | ||
| Scan020 | Memo from G.W.H. reporting on a severe two-day vehicle test tour and the performance of the Phantom car. | ||
| View original record | SG WOR/HS/GWH Merano To Hs. from G.W.H. June 28th We have completed two full day's of the tour. The test is the most severe that I have ever known both for the driver and the car. I do not believe… | ||
| Scan021 | Vehicle inspection detailing loose pipe nuts and gear/speed usage, pending a trial. | ||
| View original record | let this brake out and generally looked over the box. Induction pipe nuts had worked loose. The 2nd & 3rd gear are in constant use, and speed of 30 MPH on 2nd is frequent. It is absolutely necessary… | ||
| Scan022 | Vehicle's performance climbing the Stelvio Pass. | ||
| View original record | To Hs. from G.W.H. St Moritz 29/6/32 We climbed the Stelvio to- day and took 34 min 15 sec the Official time being 31-46 We were slightly delayed by a motor cycle also a stray cow but allowing for… | ||
| Scan023 | Vehicle's performance during a road test on difficult mountain passes. | ||
| View original record | sufficient distance from bend to bend to gather speed On second gear you do not get more than 12 MPH between the [unreadable] lower down 40 is reached on third. The whole trip is very difficult and… | ||
| Scan024 | Suitability of a standard 25 HP car for the Alpine Trials. | ||
| View original record | Sg. from Hs. C. Wor. Hs.3/AD4.7.32. ALPINE TRIALS We sent the following telegram to Hancock today "DO YOU CONSIDER 25 H.P. WOULD GO THROUGH ALPINE TRIALS SUCCESSFULLY" and below is his reply :- "YES… | ||
| Scan025 | Final report on the route, speeds, and rules of the International Alpine Trial for 1932. | ||
| View original record | To - Sg. W.R. Hs. - M. From G.W.H. ( At Chateauroux.) 4.7.32. FINAL REPORT OF THE ROUTE OF THE INTERNATIONAL ALPINE TRIAL FOR 1932. The total distance of the trial is 2,598 kms. The route taken is… | ||
| Scan026 | Road test report detailing a car's performance through mountain passes with tabulated data on temperatures, gears, and speeds. | ||
| View original record | -4- The remaining portion of the route is generally full of sharp bends and passes, which makes it hard driving to keep up the average speed. To sum up the trial, it is nothing more or less than a… | ||
| Scan027 | Vehicle performance over various Italian mountain passes, detailing speeds, gears, and temperatures. | ||
| View original record | -3- bearing of the engine. The climb being excessively steep. The Pass de Giovo from Vipiteno side is an easy 3rd gear climb, but the road is narrow. The surface is good (small gravel). Going down to… | ||
| Scan028 | Vehicle's performance and gear changes while climbing the Stelvio Pass. | ||
| View original record | -5- The third day we encountered the Stelvio. The length is recorded as being 11.25 miles, but our speedometer which was as near correct as possible registered 12.4 miles. We were balked by a motor… | ||
| Scan029 | Performance report detailing a vehicle's water temperature, gear usage, and speed while climbing the Bernina and Fluela passes in Switzerland. | ||
| View original record | -6- We continued on to the Pass Bernina. Height (m 2330) Length 31.6 kms. This Pass being in Switzerland, the cut-out had to be closed. Water Temp. Air Temp. Gears. MPH.Speed. 80°C 15°C 3rd 25 82°C… | ||
| Scan030 | Continental car trial, detailing issues encountered and specifications for a future test car. | ||
| View original record | -7- Mr Pass decided not to continue the route, we therefore cut across Switzerland and back to Boulogne. The car ran very well throughout the journey. At St Moritz after the Katchburg and Pass del… | ||
| Scan031 | Suggestion for an oil filler to avoid using dirty funnels available at garages. | ||
| View original record | -8- An oil filler so that oil from a tin, can be quickly used, only dirty funnels are produced at Garages en route. [Signature: GWHancock] G.W.Hancock. | ||
| Scan032 | Severity of the Alpine Trials and comparing car performance against competitors like Alfa Romeo. | ||
| View original record | To Hs. from Sg. Copy to Wor. C. Cx. re Alpine Trials. Thanks for Hs.1/AD4.7.32 and Hs.3/AD4.7.32 - (you might please give Wor. a copy of the latter). As mentioned to you yesterday on the tele-phone it… | ||
| Scan033 | Letter regarding the decision not to enter the 20/25 car into the Alpine Trials due to lack of confidence in its performance. | ||
| View original record | Scll/E5.7.32 5th July 1932 Dear Pass, re Alpine Trials. Referring to your call yesterday I asked Derby on the telephone to telegraph to Hancock for information as to whether he was of the opinion that… | ||
| Scan034 | Report on the suitability of the Phantom II and 25 HP cars for the Alpine Trials. | ||
| View original record | To Sg. from Hs. c. R. Wor. c. PN. EP. ALPINE TRIALS Attached herewith is a copy of report from Hancock after his trip round part of the course for the Alpine trials. It is evident that the P.II car is… | ||
| Scan035 | Report from Hancock at Boulogne regarding a car trial, detailing performance issues and required modifications for the Phantom and 25HP models. | ||
| View original record | COPY OF REPORT RECEIVED FROM HANCOCK AT BOULOGNE DATED 2.7.32. We arrived here this evening. Mr. Pass crossed over by the 7 o'clock boat. I am leaving for Paris in the morning and have arranged for… | ||
| Scan036 | Test report detailing issues with headlamps, oil consumption, and explosions in the silencer during a run. | ||
| View original record | -2- The head lamps should swivel, as part of the test is during the night chiefly on passes with the result that the beam of light shoots over the side when cornering and one is left perfectly blind.… | ||
| Scan037 | Vehicle performance issues during mountain climbs of Col de Lauteret and Col de Galibier. | ||
| View original record | File 84700 19-EX. 1.8.32. During the climb of the Col de Lauteret, the 2nd gear came out once and on the climb of the Col de Galibier it came out on two occasions. The engine temp. during the climb of… | ||
| Scan038 | Who will bear the expenses for the preliminary Alpine Trial on chassis No.28-MS. | ||
| View original record | C. to Hs. G/Gn/FM5/MG.4.8.32. Re: Chassis No.28-MS - Alpine Trials. c/09847. ---------------- We have some time and expenses booked to the above order number by Mr. Hancock in connection with his… | ||
| Scan039 | Material, manufacturing, and testing of valve springs to improve reliability. | ||
| View original record | Hs. BY. Hl. from R. c. to BJ. Wor. HY. R1/M20.10.27. VALVE SPRINGS. X.2993 X.290 I cannot understand why we are worrying with steel containing copper. I think it is quite time we obtained some springs… | ||
| Scan040 | Drawing for double valve springs for use on the final sports Phantom. | ||
| View original record | BY. from E. c. to BJ. Hs. X290 E1/M22.10.27. SPORTS PHANTOM VALVE SPRINGS. X. 290 X. 8060 We send herewith drg. LeC.2479., shewing the double valve springs for use with the final sports Phantom. You… | ||
| Scan041 | Heat treatment and testing procedures for valve springs. | ||
| View original record | +290 RG. Hs. HL. BY. from R. c. to BJ. Wor. R1/M24.10.27. VALVE SPRINGS -CONDOR AND OTHERS. X.3616 X.2993 X.290 I cannot see any possible advantage of heat treatment more than - (1) Normalising. (2)… | ||
| Scan042 | Design, materials, and testing of valve springs. | ||
| View original record | Hs. BY. RG. from R. c. to BJ. Wor. Y280 R1/M12.11.27. X. 290 X. 2993 X. 4587 VALVE SPRINGS. £ It seems waste of time to have anything to do with new design of valve springs which gives a figure of our… | ||
| Scan043 | Urging an immediate halt to valve spring production and a decision on new designs and materials. | ||
| View original record | Hs. RG. BY. from R. +290 c. to BJ. Wor. HY. R1/M16.11.27. VALVE SPRINGS. X.3616 X.290 X.2993 X.5060 X.3822 As far as I can I want to kick up hell, so that we may get some benefit immediately from the… | ||
| Scan044 | Querying valve steel specifications and requesting comparative fatigue data. | ||
| View original record | BY. Hs. from R. RG. c. to BJ. Wor. 4290 R4/M22.11.27. VALVE SPRINGS X. 2993 X. 290 Is it to be understood that our valve steels are to be as specified in HL2/EA18.11.27., which specification and steel… | ||
| Scan045 | Various valve steel specifications and a design preference from drawing DES.749. | ||
| View original record | RG. from R. c. to BJ. Wor. c. to BY. Hs. X290 RL/M5.12.27. VALVE STEELS. X.1688 X.1474 X.290 X.4587 X.2993 Regarding DES.749 sent with your RG6/LW2.12.27 E. and I prefer fig.4. Cap with present… | ||
| Scan046 | Valve spring design, hardening, and safety margins for Condor and other engines. | ||
| View original record | 4290 Hs. RG. E. BY. from R. C. R5/M17.1.28. RE. VALVE SPRINGS. X.3616 CONDOR AND ALL OTHER ENGINES. X.2993 X.290 I am very pleased to hear of the good results obtained with - (1) The newer practice in… | ||
| Scan047 | Query regarding modifications made to Phantom valve springs due to insufficient coil clearance. | ||
| View original record | BY. from E. c. to Hs. X290 E2/M21.2.28. PHANTOM VALVE SPRINGS. X.8060 X.290 X.7060 The last valve springs we made for the Phantom were LeC.2479., and these had a total dimensional coil clearance of… | ||
| Scan048 | Inclusion of a special tool for removing valve springs in customer tool kits. | ||
| View original record | Hs. X290 BY/Cgh18/G.16.4.28. RECEIVED re VALVE SPRINGS. We attach copy of Fn23/G.20.3.28. received from our Bombay Depot in regard to the question of removing valve springs. The tool which we at… | ||
| Scan049 | Letter from Bombay discussing valve spring failures and suggesting a special tool be included in car tool kits for India. | ||
| View original record | COPY. Whr. London. Bombay, Fn23/G20.3.28. RE: Valve Springs. We have recently had two cases of valve springs breaking - one on the Delhi Demonstration Car, and the other one, on the car which Grover… | ||
| Scan050 | Design of a tool for new valve springs to make it usable whether the engine head is on or off. | ||
| View original record | To BY/Cgh. from Hs. X290 Hs3/LG17.4.28. RE. VALVE SPRINGS. X8060 Replying to BY/Cgh18/G16.4.28. We are certainly in agreement that the tool which we supplied for the new valve springs should be… | ||
| Scan051 | Secret memo regarding a blueprint for SS valve springs and associated testing. | ||
| View original record | X290 R. from E. SECRET. E1/M23.4.29. C. to Sg. Hs. By. SS. VALVE SPRINGS X7060 We send you herewith blueprint of LeC. 2697. shewing the present SS. parallel spring E.78071. made taper. The average… | ||
| Scan052 | Valve lift curves and associated cam and rocker arm design. | ||
| View original record | BY. from E. c. to BJ. Hs. +290 E3/M9.5.28. EAC.10 VALVE LIFT CURVES. X. 7060 X. 7090 X. 290 We send you herewith drgs. LeC.2553 and 2559 dealing with the above. These drawings give particulars of the… | ||
| Scan053 | Valve springs for Phantom engines, noting a clicking noise issue with double springs. | ||
| View original record | To R. from Hs. c.c. to BJ. Wor. c.c. to RG. E. c.c. to BY. X290 Hs4/LG11.5.28. X8060 X7060 PHANTOM - VALVE SPRINGS. The first engines being produced with the turbulent head are instructed with… | ||
| Scan054 | Analysis of Phantom double valve springs, comparing loads and bounce speeds to a standard single spring. | ||
| View original record | To R. from Hs/Tsn. c. to BJ. Wor. c. to RG. E. c. to BY. DA. Hs/Tsn1/LG11.5.28. PHANTOM DOUBLE VALVE SPRINGS. Referring to E3/M9.5.28, the double valve springs to LeC.2479 designed for and fitted to… | ||
| Scan055 | Investigation into a high-pitched clicking noise from the valve gear at a specific engine speed. | ||
| View original record | contd :- -2- choc-a-bloc. The collars were turned back and the outers were then made .075" longer. Another complaint with these valves springs was that at a speed of 1250 r.p.m. a loud high-pitched… | ||
| Scan056 | Suggestion from Elliott to Hives to increase the coil clearance on SS valve springs by altering the bottom washer. | ||
| View original record | X290 HIVES. WW.8.11.28 +7060 REGARDING SS. VALVE SPRINGS SUGGEST YOU TRY INCREASING COIL CLEARANCE OF BOTH SPRINGS POINT TWO OF AN INCH BY ALTERING BOTTOM WASHER. ELLIOTT+ | ||
| Scan057 | New taper valve springs and camshaft provisions for the 20 HP engine to increase top speed. | ||
| View original record | BY. from E. c. to BJ. Hs. X290 E3/M10.11.28. 20 HP. VALVE SPRINGS. X.290 X.5060 X.7060 We send you herewith LeCs 2610/11. The former shews a new valve spring of increased load for putting up the speed… | ||
| Scan058 | Experimental 'SS' double valve springs and a proposal to use standard Phantom springs instead. | ||
| View original record | By. from Hs. c. to Wor. X290 HsL/LG13.11.28. 'SS' VALVE SPRINGS. X7060 At the moment the SS. double valve springs are still in the experimental state, there being one or two troubles to overcome… | ||
| Scan059 | Paper on the design and failure analysis of valve springs. | ||
| View original record | January, 1929 X290 11 Notes On Valve-Spring Design Why not design valve springs with frequencies so high that they will not vibrate until they have reached forced camshaft speeds? By W. T. Donkin… | ||
| Scan060 | Analysis of valve spring materials, heat treatment, and design to eliminate resonant vibrations, including comparative data and frequency formulas. | ||
| View original record | 12 WIRE common practice to make valve-springs from oil-tempered spring-wire. With the development of alloy steel the call arose for alloy-steel springs. The spring manufacturer naturally used the same… | ||
| Scan061 | Page describing new industrial processes for cadmium plating and wire annealing, with a partial article on spring stress calculations. | ||
| View original record | (Continued from page ...) position for an equivalent compression by an amount may be as great as or g[reater] than a half pitch of the p[o]lar coil. At an instant on[e] wave later, the condition [is]… | ||
| Scan062 | On valve-spring design, discussing natural frequency, surge, stresses, and the effects of the number of coils. | ||
| View original record | -2- Notes on Valve-Spring Design (Continued from page 12) mass of the spring. However if the design is good, springs designed for the same frequency will all come in, or surge, within a few vibrations… | ||
| Scan063 | Technical discussion on valve-spring stress, surge, and the factors leading to fatigue failure. | ||
| View original record | Contd. position for an equivalent static compression by an amount which may be as great as or greater than a half patch of the particular coil. At an instant one free wave later, the conditions are… | ||
| Scan064 | Investigation into valve spring performance, comparing double, single, and taper springs to address issues like bouncing and surging. | ||
| View original record | - R. FROM E. [R. is crossed out] SECRET. C. to SS. RG. HS. BY. [HS. BY. is crossed out] VALVE SPRINGS. X290 [Handwritten, and also handwritten and crossed out below 'VALVE SPRINGS'] The double valve… | ||
| Scan065 | Comparative analysis of various valve springs, detailing their periodicity, performance, and application. | ||
| View original record | (2) | SPRING. | PERIODICITY. Vibrations per minute. | FIGURE OF MERIT. 90,000 Max. stress + range | REMARKS. | |---|---|---|---| | (1) LeC.9. | 8,180. | 1.1 approx. | This was a very early attempt at… | ||
| Scan066 | Analysis of spring periodicity and mean radius, comparing single, double, and Curtiss D.12 valve springs. | ||
| View original record | (3) The single spring No.(3) although very nearly the same periodicity as the double spring No.(4) appears to be satisfactory where the latter is not. This is difficult to explain. To shew however… | ||
| Scan067 | The speed at which resonance occurs in a spring system due to camshaft vibration. | ||
| View original record | (4) SPEED AT WHICH RESONANCE OCCURS. Contemporary writers on this subject are agreed that the rate of forced vibration imposed by the camshaft sets up a state of resonance in the spring, which… | ||
| Scan068 | Analysis of resonance and vibrations per revolution for inlet and exhaust cams. | ||
| View original record | (5) INLET CAM LeC-2558 HEAVY ACCELERATIONS 16 VIBRATIONS PER REV. 92° 23 1 268° 67 3 It appears evident that resonance might occur with cam LeC. 2558. when the vibrations per rev. were exactly 4 or… | ||
| Scan069 | Analysis of valve spring resonance, coil surging, and the properties of taper springs, including the Ricardo formula for natural frequency. | ||
| View original record | (6) The impulses occur at intervals of 100 to 260, which reduced to the simplest proportion is 5 to 13. Resonance might therefore be expected with 18 vib: per rev: or multiples of 18. The question now… | ||
| Scan070 | Conclusion document outlining six key points regarding spring design and performance. | ||
| View original record | (7) CONCLUSION. This subject might profitably be pursued further both mathematically and experimentally to more definite conclusions. For example, we cannot explain the difference in behaviour between… | ||
| Scan071 | Mr. Elliott's investigation into different types of valve springs. | ||
| View original record | E. RG. Hs. BY. from R. c. to SG. Wor. X290 R2/M23.2.29. VALVE SPRINGS. X. 290 X. 2993. Mr. Elliott's investigation is excellent and should be carried on as long as it shews progress towards solving… | ||
| Scan072 | Performance and potential redesign of the 'SS' Taper Valve Spring. | ||
| View original record | +290 R. from E. c. to SG. Hs. BY. E1/M14.3.29. 'SS' TAPER VALVE SPRING. X.7060 X.290 The present SS. valve spring seems to be a very good [strikethrough]and[/strikethrough] one and we do not propose… | ||
| Scan073 | Technical memo on valve spring improvements for 20 HP and Aero engines, highlighting the advantages of taper springs. | ||
| View original record | x290 R3/M18.3.29. RG. E. Hs. BY. from R. c. to SG. Wor. VALVE SPRINGS - SS. 20 HP. X.290 & AERO F. H. & R. X.2993 Between us we have produced valve springs which promise to be better than any of our… | ||
| Scan074 | Agreement to test a well-tapered valve spring against a parallel one. | ||
| View original record | Hs. BY. c. to SG. Wor. E. X290 R9/M25.3.29. VALVE SPRINGS. X. 290 X. 7060 Though we are in a good position as regards these on all our work we have agreed that it would be worth while to make a well… | ||
| Scan075 | Note regarding an extra heavy valve spring. | ||
| View original record | E78071. Extra heavy valve spring | ||
| Scan076 | Letter from Rolls-Royce of America to the UK discussing valve spring surge, referencing external papers, and requesting harmonic analysis of a cam layout. | ||
| View original record | ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. Y290 OY 6 May 2nd, 1929. Mr. Robotham, Rolls Royce Ltd., Derby, England. Dear Mr. Robotham: VALVE GEAR - SECTION 5060 I attach a copy of Donkin and… | ||
| Scan077 | Valve spring design, harmonics, surging, and performance comparisons. | ||
| View original record | SPRING. Apparently Donkin feels that any practical cam, however designed, is bound to be represented by a harmonic series in which there will be a number of important components in the higher orders… | ||
| Scan078 | Letter requesting notes or ideas regarding noise from springs and the tilt of faces. | ||
| View original record | - 3 - We still do not know whether the tilt of the faces has anything to do with noise, or whether all springs give quietest operation in about the same position. Have you any notes or ideas on this… | ||
| Scan079 | Society of Automotive Engineers preprint paper on the idiosyncrasies and causes of issues with valve mechanisms. | ||
| View original record | Handwritten: To Mr Robotham T. P. H. getter PREPRINT.—Paper to be presented at the Annual Meeting of the Society of Automotive Engineers, Detroit, Jan. 15-18, 1929. Subject to revision. This preprint… | ||
| Scan080 | Different instruments for studying valve-mechanism idiosyncrasies and valve motion. | ||
| View original record | 2 VALVE-MECHANISM IDIOSYNCRASIES The valve motions should be studied directly. A certain amount of this can be done on an engine by observing the valve and spring motions with some sort of… | ||
| Scan081 | Study of valve-mechanism idiosyncrasies, focusing on spring vibration, surge, and methods of measurement. | ||
| View original record | 4 VALVE-MECHANISM IDIOSYNCRASIES changes the length of the slot and of the image on the screen accordingly. The shutter is attached to the spring coil by means of a piece of stiff wire, G, soldered to… | ||
| Scan082 | Analysis of valve-mechanism idiosyncrasies, detailing harmonic theory, valve lift curves, and spring vibrations. | ||
| View original record | 6 VALVE-MECHANISM IDIOSYNCRASIES Valve Lift Cam Angle FIG. 10—VALVE DIAGRAM PLOTTED FROM POINT-BY-POINT READINGS The Fine Line Represents Lifts as Observed with the Telescopic Indicator at a Camshaft… | ||
| Scan083 | Study of valve-mechanism idiosyncrasies, focusing on spring vibration and surge with experimental data graphs. | ||
| View original record | 8 VALVE-MECHANISM IDIOSYNCRASIES mechanism, consisting of an eccentric and mushroom follower, was used to operate the spring up to 1850 r.p.m. of the shaft and no vibration whatever occurred. Fig. 19… | ||
| Scan084 | Technical paper on the idiosyncrasies and harmonic analysis of valve mechanisms. | ||
| View original record | 10 VALVE-MECHANISM IDIOSYNCRASIES tions per minute in valve-closed position. The record indicates a considerable increase in frequency during valve lift and the resultant damping effect on the… | ||
| Scan085 | Paper about using an electric telemeter to investigate valve-spring surge. | ||
| View original record | To Mr Robotham P. H. Futter PREPRINT—Paper to be presented at the Annual Meeting of the Society of Automotive Engineers, Detroit, Jan. 15-18, 1929. Subject to revision. This preprint is issued… | ||
| Scan086 | Paper on the use of an electric telemeter to measure and analyze valve-spring surge. | ||
| View original record | 2 ELECTRIC TELEMETER AND VALVE-SPRING SURGE pressure on the other. Each stack forms one arm of a Wheatstone's bridge, and the current through the bridge instrument—milliammeter or galvanometer—varies… | ||
| Scan087 | Mathematical and oscillogram analysis of valve-spring surge and harmonics. | ||
| View original record | where A₀ is a constant term, or the average ordinate of the curve; A₁ is the amplitude of the fundamental; Aₙ is the amplitude of the nth harmonic; t is the time, in seconds, and ω is the angular… | ||
| Scan088 | Analysis of spring and cam harmonic characteristics with oscillograms and computed amplitude data. | ||
| View original record | ate when actuated by cams having different har-monic characteristics. The characteristics of the cams and springs used are summarized in Tables 1 and 2, respectively. Speeds mentioned in the following… | ||
| Scan089 | Analysis of valve-spring surge using an electric telemeter, with spring characteristic data and oscillograms. | ||
| View original record | 8 ELECTRIC TELEMETER AND VALVE-SPRING SURGE TABLE 2—SPRING CHARACTERISTICS | | Spring No. 1 | 2 | 3 | 4 | | :--- | :--- | :--- | :--- | :--- | | Pitch Diameter, in. | 0.998 | 1.000 | 1.008 | 0.998 | |… | ||
| Scan090 | Analysis of valve-spring surge and stress using an electric telemeter to inform spring design. | ||
| View original record | [Page 10] 10 ELECTRIC TELEMETER AND VALVE-SPRING SURGE cam was carefully checked and found to impart almost a pure sine-wave motion to the valve. Inspection of this oscillogram shows no resonant… | ||
| Scan091 | Development of valve springs to reduce noise in the Phantom engine valve gear. | ||
| View original record | To OY. from Hs/Rn. 4290 Hs/RmL/LG13. 5. 29. X8060 With reference to your letter of the 2nd.inst. re. Valve Gear. Without going into the mathematics of the valve spring, perhaps it would be useful if I… | ||
| Scan092 | Continued discussion on engine valve train issues, including valve seating, tappet clearance, and valve spring performance. | ||
| View original record | contd :- -2- in the guide and the valve seating is cut exactly square with in the guide, the valves set up a click when they go on to their seat if the tappet clearance is much greater than .004. We… | ||
| Scan093 | Requesting the exact specifications for new valve springs for a high-speed test on development engine No. 20. | ||
| View original record | J290. To BY. From Hs/ACL. c. to AG. c. to RIC. c. to Mr. Jacques. Hs/ACL.1/AJ.19.3.30. (x4657) HIGH SPEED VALVE SPRING TEST. We are preparing development engine No. 20 for the 12 1/2 hours test on the… | ||
| Scan094 | Valve spring coil vibrations and requesting specific data for a modified spring design. | ||
| View original record | X.290. To By. from EFC. EFCL/AD30.8.30. VALVE SPRING COIL VIBRATIONS. I have gone into the matter of vibration of spring coils and the attached represents the problem as it appears to me. You will see… | ||
| Scan095 | Notes concerning the design of valve springs as affected by spring coil vibrations. | ||
| View original record | NOTES CONCERNING THE DESIGN OF VALVE SPRINGS AS AFFECTED BY SPRING COIL VIBRATIONS. The following symbols are used :- Diameter of wire = d (") " " coil = D (") Number of effective turns = k Density of… | ||
| Scan096 | Technical analysis of the frequency of vibration in spiral springs, specifically in relation to valve spring breakages. | ||
| View original record | -2- where E is the elasticity or rate of the whole spring, namely the load in poundals per foot of compression and M is the mass of the whole spring in pounds. The more immediately useful… | ||
| Scan097 | Theoretical analysis of spring design, discussing the relationship between frequency, stress, deflection, and material properties. | ||
| View original record | -3- (again omitting the invariable portion namely shear modulus C and ) also varies as the same quantity d kD² There lies in the correspondence here pointed out, the difficulty of rearranging the… | ||
| Scan098 | Analysis of stress, load, and deflection in parallel spiral springs using mathematical formulas. | ||
| View original record | -4- considerable increase in the stress in the fully compressed position is allowable — the initial deflection in the set up position being considerably reduced to keep the stress the same in that… | ||
| Scan099 | Theoretical analysis of spring stresses, frequency, and deflection, including mathematical formulas. | ||
| View original record | -5- d/kD^2 however, has been put up which means that 1/kD^5/3 has been put up. This can be done either by reducing k or reducing D. Other circumstances could be brought into account to determine… | ||
| Scan100 | The mathematical principles and properties of taper spiral springs. | ||
| View original record | -6- only be indicated on general lines, as above. If it is proposed to utilise taper spiral springs, the smaller value of D being at the end of the spring where the compression is applied, this would… | ||
| Scan101 | Attached notes on the subject of valve spring coil vibrations. | ||
| View original record | X 290 To R. from EFC. c. Sg. c. E. Rg. EFC7/AM 3.9.30. Please find attached copy of some notes dealing with the subject of valve spring coil vibrations and which were prepared for Mr.Bailey to his… | ||
| Scan102 | Noise issues with the valve springs on the 20/25HP engine and proposing a solution. | ||
| View original record | Hs C-Sect. from Mx. Mx1/T19.9.30 VALVE SPRINGS The 20/25HP engine gives trouble on test, due to two noises from the valve mechanism, one is "swishing" or "dithering" which occurs at approximately 40… | ||
| Scan103 | Comparing the quietness and performance of two different valve springs, E.78071 and E.70442. | ||
| View original record | X290 To Ev. from Hs/GWH. Hs/GWHL/AD25.9.30. RE - VALVE SPRINGS. We have been testing out for quietness and general behaviour the two types of valve springs E.78071 and E.70442. The spring E.78071… | ||
| Scan104 | Modifications to valve springs and washers for the Phantom II and 20/25 HP chassis. | ||
| View original record | c.Hs. X290 BY/EM5/J.29.9.30. RECEIVED SEP 29 1930 H Valve Springs. With respect to Mxl/T.19.9.30, with regard to the above, will you kindly note the action which has been taken to reduce the clearance… | ||
| Scan105 | Blueprint detailing the location and part numbers of valve springs for the 20/25 HP and 40/50 HP chassis. | ||
| View original record | [ "FILE UNDER VALVE SPRINGS", "20/25 HP Chassis", "Location of Valve Springs", "40/50 HP Chassis", "Left Diagram (20/25 HP Chassis):", "Part Numbers: E51088, E55672, E56051", "Dimensions: .975 +10,… | ||
| Scan106 | Quarterly complaint note regarding valve springs, suggesting they be changed in-house to avoid future issues. | ||
| View original record | X290 By. from Hs/Rn. Hs/Rml/AD12.11.30. X290 X4117 QUARTERLY COMPLAINTS. Attached is a note from GWH. re valve springs. We believe it would be more satisfactory to change the springs on cars at… | ||
| Scan107 | Investigation into valve noise on a Phantom II, traced to improperly squared valve springs. | ||
| View original record | Re: PHANTOM II VALVE SPRINGS. We have had considerable trouble in satisfying an owner who complained of valve noise at 40 to 45 m.p.h. This was definitely caused by the period of the spring at this… | ||
| Scan108 | Improved spring and an issue with a filter fouling a cross member. | ||
| View original record | -2- I would strongly advise the fitting of the improved spring E.81550 to all the present cars in production and for depots to have these springs to replace the broken springs dealt with. I have tried… | ||
| Scan109 | Extract from quarterly complaints regarding the fitting of a new spring and a disagreement on coil bedding. | ||
| View original record | EXTRACT. Hs/Rm. X290 BY7/G.13.11.30. QUARTERLY COMPLAINTS. ------------------- X.290. X.4117. Referring to Hs/Rml/AD.12.11.30. and Mr. Hancock's note of the 10th.inst. in regard to the two points… | ||
| Scan110 | Handing over new closed-end valve springs for the 20/25 HP and Phantom II models to the Experimental Department for testing due to noise issues. | ||
| View original record | R.W.H. Take 20 H.P. set to France HS/RM. X290. BY/EML/J.22.11.30. Valve Springs. We have handed over to the Experimental Dept. one set of 20/25 H.P. valve springs and one set of Phantom II valve… | ||
| Scan111 | The mathematical formulas for calculating valve spring wave velocity. | ||
| View original record | X290. VALVE SPRING WAVE VELOCITY. The wave velocity = √e/m e = force for unit compression in unit length = force for unit strain (poundals) m = mass per unit length (pounds per inch) Dimensionally… | ||
| Scan112 | The formulas for wave velocity and stress in terms of load. | ||
| View original record | -2- Wave velocity = sqrt( (cd^4 g / 8D^3 k^1) * (4L / ( (k^1 L + 1) 2 Dd^2 w ) ) ) = (dL / (Π(2k^1L + 1) D^2)) * sqrt(2Cg / w) = (d / (2 k^1 D^2)) * sqrt(2Cg / w) ____________________ Stress in terms… | ||
| Scan113 | Page of valve spring calculations for a 40/50 model. | ||
| View original record | 4290. FILES. 18.12.31. 40/50 VALVE SPRING CALCULATIONS. we have - To make tappet follow the cam at 3700 R.P.M. Wt. of tappet .284 lbs. Accel. @ 3700 R.P.M. = 3800 ft/sec2. ∴ Load = (.284 X 3800) / 32… | ||
| Scan114 | Requesting a further set of 25 HP valve springs with revised specifications to achieve the required load. | ||
| View original record | RHC. From Hs/Gry. X290 Hs/Gry.1/MA.19. 1. 32. 25 HP. VALVE SPRINGS. Will you please make a further set of valve springs to Hs.477. The first set were under the required load. We should like this set… | ||
| Scan115 | Technical memorandum detailing empirical data and requirements for Phantom II and 25 HP valve springs. | ||
| View original record | E. From Hs/Gry. c. to By. Wor. 8290. Hs/Gry.1/MA.21. 1. 32. P.II VALVE SPRINGS. We have the following empirical data to work on :- Camshaft. Rockers. Valve lift. Spring. lbs (valves open.) Speed of… | ||
| Scan116 | Standardisation of valve springs, bottom washers, and valve guides to enable higher engine revs without spring bounce. | ||
| View original record | RR 755 (10H) (T9120, 13-10-31) BM. S/7586. COMPLETED 16. 2. 32. X290 STANDARDISATION of CHASSIS PARTS. Date 7.1.32. X No. 290 Drawing No. .451 Part List Description of Parts. VALVE SPRINGS… | ||
| Scan117 | Standardisation form for a chassis part change. | ||
| View original record | STANDARDISATION OF CHASSIS PARTS. Drawing No. R.A. X 628 Date 2.1.32 The number of the first chassis on which the new part will be fitted......... 176 in 'T' Date when chassis will be handed to test… | ||
| Scan118 | Rating test results for Peregrine Tappet and Valve springs, showing deflection under various loads. | ||
| View original record | X4701 PEREGRINE FILE "PEREGRINE" SPRINGS RATING TEST. TAPPET SPRING LOAD LB. 5 10 15 20 25 DEFLECTION. INS. .098 .195 .285 .376 .468 VALVE SPRING. LOAD LB. 20 40 60 80 DEFLECTION. INS. .295 .580 .840… | ||
| Scan119 | Graphs showing load vs. deflection spring ratings for 'Peregrine' Tappet and Valve springs. | ||
| View original record | "PEREGRINE" SPRING RATINGS TAPPET SPRING DEFLECTION - INS - LOAD (LBS) SPRING RATING = 53.53 LBS/INCH CHOC - A - BLOC VALVE SPRING DEFLECTION - INS - LOAD (LBS) AVERAGE SPRING RATING = 79 LBS/INCH… | ||
| Scan120 | Testing double valve springs and requesting a set be fitted to an engine. | ||
| View original record | Hs/Lid. from Hs/Rm. x290 Hs/Rm.7/ADL6.8.32. We have now tested out a set of double valve springs on 19-EX which were free from the objectionable surging period. There are two more sets of these… | ||
| Scan121 | Request to run an endurance test on valve springs using a test bed unit. | ||
| View original record | Hs/TS. from Hs/Rm. X290. Hs/Rm.9/AM 6.8.32. 565 Will you please arrange to run valve springs No.Hs.664/on your test bed unit. These appeared to be satisfactory on the road and want some endurance… | ||
| Scan122 | Exhaust valve failure on a Phantom II Unit 25 engine, with detailed specifications for valve springs. | ||
| View original record | FILES. X290. PHANTOM II. VALVES. X7060. P.II. Unit 25. E.83095. Exhaust Valve (Dome Head) Comp. Ratio 5.25 : 1 Camshaft W.W. (1140) E.82448 Std. induction system. Valve springs Hs.659. Valve lift .470… | ||
| Scan123 | Requesting the fitting of a set of double valve springs to a high compression head for P.2 25. | ||
| View original record | 8290. RHC. From Hs/Rm. Hs/Rm.1/MA.23.9.32. P.2 VALVE SPRINGS. Will you please fit one set of double valve springs to high compression head for P.2 25. Outer spring Hs.688 } Inner spring Hs.665 }… | ||
| Scan124 | Carburetter modifications and performance improvements for the 20 HP car, comparing it to competitors. | ||
| View original record | To Hs. from R. c. to CJ. BY. X5070 R7/M1.9.25. 20 HP. CAR. X.5080 X.5770 X.5070 We have some modifications instructed for the carburetter which we hope will give more power, if we take the trouble to… | ||
| Scan125 | Solutions for a broken Goshawk engine induction pipe flange and future design considerations. | ||
| View original record | To Hs. } FROM R. c. to CJ. X5070 R2/M14.9.25. RE. GOSHAWK INDUCTION [over struck-through]IGNITION[/over struck-through] PIPE (BROKEN FLANGE). X.5070 X.5080 This should have been referred to E. at WW.… | ||
| Scan126 | Attempts to increase power on a 20 HP engine and related chassis weight increases. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. X5070 EXPERIMENTAL REPORT. COPIES TO RCJ BJ WOR B E Da. EF. PNOV RG Expl. No. +4134 +5080 REF. Hs1/LG17/2.26. OBJECT OF TEST. To increase power on 20 HP.… | ||
| Scan127 | Experiments to determine if the power output of the 20 HP engine could be increased by using a larger carburetter. | ||
| View original record | Hs/ACL/LG17.2.26. ------------------ 20 HP. ENGINE - POWER WITH LARGER CARBURETTER THROTTLE AND 1.5" DIAMETER PASSAGE IN CYL. BLOCK. The following experiments were carried out, as requested, to… | ||
| Scan128 | Engine power test results comparing standard and large carburetter throttles, and the effect of throat size on power output. | ||
| View original record | contd :- -2- valve, dashpot, and spring were retained. The power curves given below are the average of several tests. The standard silencing arrangements were used. | R.P.M. | B.HP. Std. pipe and… | ||
| Scan129 | Carburetter metering issues and maximum power tests on a 20 HP engine. | ||
| View original record | contd :- -3- employed for each test. With regard to the metering of the large throat carb., it was found to be bad at low depressions and possessing a very weak region just before the high speed jet… | ||
| Scan130 | Test report comparing the performance of a standard carburetter against a diffuser jet carburettor, including a performance graph. | ||
| View original record | contd :- -4- This simple test however is sufficient to show that with the present engine and type of carburetter used there does not seem much possibility of obtaining any appreciable power increase… | ||
| Scan131 | Report page summarising experiments on carburettors, including a diffuser model and one with a light air valve. | ||
| View original record | contd :- -5- show the relationship between specific consumption and mean eff- ective pressure with varying mixture strengths for each carb; at 750 r.p.m. It will be seen that there is a very slight… | ||
| Scan132 | Experiments into carburetter throat size and diffuser jets as a solution to power loss in the 20 HP engine. | ||
| View original record | contd :- -6- The metal thickness between the cylinder bores and the induction passage with the large diameter is .075" and makes casting more difficult. CARBURETTER THROAT SIZE. By increasing the… | ||
| Scan133 | Modifications to the 20 HP induction and exhaust pipes with a strengthened flange. | ||
| View original record | To BY. from E. c. to CJ. c. to RG. c. to Hs. X5070 E2/M2. 3. 26. 20 HP. INDUCTION & EXHAUST PIPES WITH STRENGTHENED FLANGE. X.5230 X.5070 We thank you for your scheme No.735 which shews the above… | ||
| Scan134 | Approving the design for a 20 HP engine's aluminium induction pipe. | ||
| View original record | To E. BY. Hs. FROM R. LE CANADEL. c. to CJ. BJ. RE. 20 HP. EXHAUST AND INDUCTION PIPES. X.B230 X.5070 I think LeC.2216 quite good, go ahead with aluminium induction pipe. I think this is now good and… | ||
| Scan135 | The instruction to proceed with work on 20 HP induction and exhaust pipes. | ||
| View original record | To BY. from E. c. to CJ. Hs. X5070 E1/M25.3.26. 20 HP. INDUCTION & EXHAUST PIPES. X.5070 X.5230 We send you herewith the originals of LeCs. 2206 and 2216. You will have gathered from R6/M24.3.26. that… | ||
| Scan136 | Comparison between a Lorraine car and a 20 HP model using different carburetters and chassis. | ||
| View original record | To Hs. from R. c. to BJ. X5070 R8/M9.11.26 RE. LORRAINE CAR. X.3588 X.5080 X.5070 I think it would be worth while to rig up one of our 20 HP. carburetters on the Lorraine, and also the Lorraine… | ||
| Scan137 | The new 20 HP induction system, detailing its advantages over the standard system, including weight reduction and simplified manufacturing. | ||
| View original record | To R. from Hs/AJL c. to BJ. Wor. c. to RG. E. c. to DA. BY. Y5070 Hs/AJLL/LG27.1.27. 20 HP. INDUCTION SYSTEM. (LeC. 2216) Y5070 The primary object of the above induction pipe system is to provide a… | ||
| Scan138 | Test report comparing the performance of 'Manifolds to LeC. 2216' against standard manifolds, with power curve data. | ||
| View original record | contd :- Engine 11-G-111. Standard carburetter. Test bed exhaust system and bomb silencer. Power curve - corrected to N.T.P. | | Manifolds to LeC. 2216 | Std. manifolds. | Loss or gain in B.HP. to… | ||
| Scan139 | Design schemes and modifications for the India 3 engine. | ||
| View original record | 45070 E. HS. BY. from R. c. to BJ. Wor RG. Fl. R1/M21.3.28. INDIA 3. ENGINE. X.5770 X.5070 X.5080 X.5080 You send me quite a lot of good schemes to choose from. Though this is very urgent we must have… | ||
| Scan140 | Recurring failure of induction pipes on the 20 HP exhaust and induction system, requesting a standardization sheet for an improved design. | ||
| View original record | Hs. C-BY/CS. X5070 BY9/H. 1.4.27. RECEIVED APR 1 1927 20 HP. EXHAUST AND INDUCTION SYSTEM. We do not appear to have received a standardization sheet for LeC.2216, covering an improved and combined… | ||
| Scan141 | With a diagram discussing an alternative design for an induction pipe to prevent fuel flow issues. | ||
| View original record | E. HS. from R. BY. c. to BJ. Wor. RG. Fl. X5070 R1/M7.4.28. INDIA 3. X.5070 X.5080 LeC. 2541. I am not very pleased with this. Is it not better to feed the induction pipe thus :- because the petrol… | ||
| Scan142 | Technical letter discussing carburetter design with accompanying hand-drawn diagrams. | ||
| View original record | contd :- -2- Floats. Because float wide cyl. bore must clear jacket. Probably can be cut in. We seem to have got back to your Lec. 2527, but so much of the carburetter uptake is in the cyl. block.… | ||
| Scan143 | Standardisation report for replacing the cast iron induction pipe with an aluminium one to improve reliability. | ||
| View original record | RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1187. /5070 . Completed 25-5-27 STANDARDISATION of CHASSIS PARTS. Date 5.4.27 Description of Parts. ALUMINIUM INDUCTION PIPE IN PLACE OF CAST IRON. Origin.… | ||
| Scan144 | Costs and implementation details for a new part on the 'L' series chassis. | ||
| View original record | STANDARDISATION of CHASSIS PARTS OTO No. X Drawing No. (1) The number of the first chassis on which the new part will be fitted. "L" series. (2) Date when the chassis will be handed to test. 8/10/27.… | ||
| Scan145 | Potential engine design improvements and modifications. | ||
| View original record | E. from R. X5070 c. to BJ. Wor. BY. Hs. R3/M28. 2. 28 INDIA 2. X.5770 X.5070 X.5230 X.5080 X.5010 X.5000 In addition to the 6 items given in DA/EV/24.2.28, we ought to get some engine improvements :… | ||
| Scan146 | Potential modifications to the cylinder head and induction pipe arrangement for the India 3 model. | ||
| View original record | R. from E. c. to BJ. Hs. BY. INDIA 3 - ARRANGEMENT OF CYL: HEAD X.5050 AND INDUCTION PIPE. X.5070 We quite agree that if the valves can be moved out of centre, then all the cyl. nuts can be mude… | ||
| Scan147 | Arrangement of the cylinder head and induction pipe for 'INDIA 3', enclosing drawing LeC.2541. | ||
| View original record | BY. from E. c, to BJ. Hs. X5070 E3/M5.4.28. INDIA 3. -> ARRGT. OF CYL: HEAD AND INDUCTION PIPE. X.5050 X.5070 We send you herewith drg.LeC.2541 shewing the above. E. | ||
| Scan148 | Blueprint for an underfed type of induction pipe, detailing a modification to lower the carburettor. | ||
| View original record | R. from E. c. to BJ. Hs. BY. X5070 E1/M5.4.28. INDIA 3 - UNDERFED TYPE OF INDUCTION PIPE. X.5070 X.5080 We send herewith blueprint of LeC.2543 shewing the above arranged for the same head as the weir… | ||
| Scan149 | Design of induction pipes and carburettors for the 'India 3' project, making comparisons to the 'SS' Phantom model. | ||
| View original record | E. BY. HS. from R. c. to BJ. Wor. X5070 R1/M8.4.28. X.5070 X.5080 INDIA 3 - INDUCTION PIPES, CARBURETTER ETC. You will notice that I favour this being exactly the same as 'SS' Phantom. Therefore as… | ||
| Scan150 | Novel, patentable scheme for car induction pipe heating using an exhaust hot spot and a valve. | ||
| View original record | X5070 Hs. RY. from R. c. to BJ. Wor. c. to RG. NA. c. to Mr. Claremont. R3/M21.6.28. CARS - INDUCTION PIPE HEATING. X.7070 X.5070 X.7080 Apparently from Hs' reports and our own impressions we must… | ||
| Scan151 | Alternative policy for carburettors and induction pipes. | ||
| View original record | Hs. from R. 15070 c. to BJ. c. to WOr. c. to BY. __________ R2/M21.6.28. __________ X.7080 X.5080 X.7070 X.5070 CARBURETTERS & INDUCTION PIPES. __________ Should the new RR. vertical expanding… | ||
| Scan152 | On mixture distribution issues in SS and G4 induction pipes, proposing steam heating and hydraulic testing. | ||
| View original record | Hs. from R. c. to Wor. BY. E. X5070 R5/M11.12.28. SS. and G4. INDUCTION PIPE. X.7070 X.5070 In examining the distribution we cannot help thinking that there is sure to be a difference with different… | ||
| Scan153 | Standardisation proposal to replace the cast iron induction pipe with an aluminium version to improve reliability. | ||
| View original record | RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1187. Handwritten: X5071 completed 25.5.27 STANDARDISATION of CHASSIS PARTS. Date 5.4.27 Description of Parts: ALUMINIUM INDUCTION PIPE IN PLACE OF CAST… | ||
| Scan154 | Standardisation document for chassis parts for the 'L' series, detailing the test date, cost of tools, and nil cost for scrapped material. | ||
| View original record | STANDARDISATION OF CHASSIS PARTS Description of Parts Origin Experiment X No. (1) The number of the first chassis on which the new part will be fitted. 'L' series. (2) Date when the chassis will be… | ||
| Scan155 | Design change for the cylinder block water pipe connection on the India 3 project. | ||
| View original record | BY. from E. c. to BJ. Hs. X5070 E1/M13.7.28. INDIA 3. CYLINDER BLOCK. X.5050 X.5070 X.5230 We send herewith Lec.2574 shewing the two bolter flange for the water pipe connection to the cyl. block on… | ||
| Scan156 | Drawing Lec.2571 for an induction pipe for the 'India 3' project, and its adaptation for various carburettors. | ||
| View original record | BY. from E. c. to BJ. Hs. X5070 E2/M14.7.28. INDIA 3. INDUCTION PIPE. X.5070 X.5230 X.5080 We send you herewith drg. Lec.2571 shewing an induction pipe for India 3. of the underfed slot type. The drg.… | ||
| Scan157 | Sending drawing LeC. 2622, detailing alternative induction pipes to fix distribution troubles. | ||
| View original record | BY. from E. c. to BJ. Hs. X. 5070 E2/M13.12.28. G.4. INDUCTION PIPES. We send you herewith LeC. 2622 shewing alternative induction pipes, to cure the distribution troubles recently reported. E. | ||
| Scan158 | Abandoning exhaust heating for an induction system and the implications for engine performance. | ||
| View original record | Hs. E. FROM R. DA. BY. c. to Sg. Wor. c. to PN. CWB. X5070 R3/M1.2.29. S.S. AND G.4. INDUCTION SYSTEM. X.7070 X.5070 X.7230 I have read carefully Mr. Lovesey's notes on the heating of the above. I am… | ||
| Scan159 | Design and testing of a new induction pipe to trial a single carburetter system for the 'Japan' project. | ||
| View original record | X5070. To By. from Hs/ACL. Hs/ACL4/AD29.11.29. RE. "JAPAN" INDUCTION PIPE. X5070 X5080 X4660: R. wishes us to see if we can get similar results to those given by twin carburetters by means of one… | ||
| Scan160 | Tests comparing a single carburetter with a twin ramming pipe against a twin carburetter setup on a 'Japan' engine. | ||
| View original record | To R. From Hs/ACL. C: to Sg. Hor. C. to W. Da. C. to Ry. X5070 Hs/ACL.1/HWJ.23.12.29. x5070 x5080 x3603 x4660. 'JAPAN' INDUCTION SYSTEM. TESTS WITH TWIN RAMMING PIPE & SINGLE CARBURETTER. We have now… | ||
| Scan161 | Report comparing the performance of single versus twin carburettor systems on the Phantom model. | ||
| View original record | -2- 'are, however, modifying this so as to get the low speed readings. Also the distribution was not good when using the two Claudels and we think considerable improvement can be made by taking the… | ||
| Scan162 | Graph comparing engine performance with different induction pipe and carburetor setups for a VG-8 engine. | ||
| View original record | 24-12-29 V763 INDUCTION PIPE COMPARISON (JAPAN). ENGINE Nᵒ VG-8 COMPRESSION RATIO = 5.25. 116° CAMSHAFT. OPEN EXHAUST. CURVES CORRECTED TO N.T.P. BRAKE HORSE POWER R.P.M. OF ENGINE INDUCTION PIPES &… | ||
| Scan163 | Blueprint showing three different induction pipe designs and dimensions for carburettor tests on a 'Japan' engine. | ||
| View original record | INDUCTION PIPE TESTS ON JAPAN. 1.5 DIA 5" 8.8 CRS. 11.1 OVERALL. 2" RAD. 7" INDN PIPE USED WITH STROMBERG CARB. "SOLEX" TYPE PIPE FOR TWIN CARBS. GIVING ONE WAY GAS FLOW TO CYLINDERS INDN PIPE TESTED… | ||
| Scan164 | Twin carburetter tests and camshaft comparisons performed on the 'Japan' engine. | ||
| View original record | COPY. To R. From Hs/ACL. c. to Sg. Wor. c. to Rs. E. c. to Da. By. X5070 Hs/ACL.1/MJ.23.5.30. X.5080 X.1053 X.5090 X.5070 Y 5-30 TWIN CARBURETTER TESTS & CAMSHAFT COMPARISONS ON "JAPAN" ENGINE. We… | ||
| Scan165 | Tests on engine induction systems, including riser pipes, bore sizes, and chokes. | ||
| View original record | -2- Hs/ACL.1/W.23.5.30.Contd. tests it was an advantage to keep the riser pipes as short as possible both with regard to power output and quick engine response to throttle opening. The hot spot was… | ||
| Scan166 | Report comparing engine performance with different camshaft durations and carburetter configurations. | ||
| View original record | -3- at low R.P.M. full throttle. We found we could open up the brake to maximum R.P.M. and the engine would speed up without the slightest uneveness. With the Std. six port system, which although an… | ||
| Scan167 | Summary of experiments on the 'Japan' engine concerning carburetter and camshaft performance. | ||
| View original record | -4- Hs/ACL.1/MJ.23.5.30. Contd. and 112° long duration camshaft. The results of our experiments on "Japan" can be summarised as follows :- (1) Twin carburetters give a very definite gain in power over… | ||
| Scan168 | Blueprint showing actual valve timing data from twin carburetor tests on a 'Japan' engine with .020 tappet clearance. | ||
| View original record | ACTUAL VALVE TIMING TAKEN ON ENGINE WITH .020 TAPPET CLCE. | CAMSHAFT. | 116° | 112° | 110° | |------------|--------------|--------------|--------------| | In. OPENS. | 13° A.T.C. | 7° A.T.C. | 16°… | ||
| Scan169 | Performance graph comparing large and small bore induction manifolds on a 'Japan' engine with twin Zenith carburettors. | ||
| View original record | TWIN ZENITH CARBS. ON "JAPAN." V 867. COMPARISON OF LARGE & SMALL BORE INDUCTION MANIFOLD. 26 M/M CHOKES IN CARB. 5.25/1 COMPn RATIO. 116° CAMSHAFT. OPEN EXHAUST. SMALL BORE PIPE = LARGE BORE PIPE =… | ||
| Scan170 | Performance graph comparing different camshafts on a 'Japan' engine model, plotting Brake Horse Power and Brake Mean Effective Pressure against RPM. | ||
| View original record | CAMSHAFT COMPARISONS ON "JAPAN" V868. TWIN ZENITH CARBS - 26 M/M CHOKES. SMALL INDN PIPE (1.25 INT. DIA) 5.25/1 COMPN RATIO. OPEN EXHAUST. B.H.P. (CORRECTED FOR TEMP & PRES.) B.M.E.P. lbs/□" R.P.M.… | ||
| Scan171 | Performance graph comparing a Twin Zenith carburetter against a standard chassis carburetter on the 'Japan' engine configuration. | ||
| 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. B.H.P.… | ||
| Scan172 | Arrangement of a Twin Zenith carburettor and induction pipe on a Japan engine. | ||
| View original record | V870. INLET TO HOT SPOT 1.250" INSIDE DIA. 1.400 DIA THROTTLE BORES OUTLET FROM HOT SPOT 3.125 2.062 PIPES TAPER FROM 1.250 DIA TO 1.400 DIA TO MATCH CARB THROTTLES ARRANGEMENT OF TWIN ZENITH CARB. ON… | ||
| Scan173 | Proposed modification to the 25HP induction stand pipe (E.51083) to improve starting by cutting off the pilot pipe. | ||
| View original record | X50701 To By. From Hs/GWH. c. to Hs. Hs/GWH.3/KT.6.1.31. X5770 We have obtained better results in starting up the 25HP. by a modification to the stand pipe in the induction pipe. We propose to… | ||
| Scan174 | Preliminary arrangement for the Japan 3 induction system. | ||
| View original record | R. FROM E. C. to SG. WOR. C. to HS. BY. HY. & & X8070 E2/M5.3.31. JAPAN 3. INDUCTION SYSTEM. X.5070. X.5080. Please find herewith a print of LeC. 2881. shewing a preliminary arrangement of the above… | ||
| Scan175 | Request to manufacture a 25 HP induction pipe for a Zenith 35 D.U.P. carburetter. | ||
| View original record | X5070 To RHC. From Hs/Rm. Hs/Rm.5/KT.16.5.31. 25 HP. INDUCTION PIPE. Will you please make an induction pipe for the latest Zenith carburetter, type 35 D.U.P. Attached is a scheme which we think has… | ||
| Scan176 | Modifications to a carburetter and induction pipe for a 16.G.IV model, and checking availability for an 18.G.IV. | ||
| View original record | To R. Matthews. From Hs/Rm. 85070. Hs/Rm.4/KT.22.6.31. X.5080. X.5070. The carburetter and induction pipe now on 16.G.IV. were modified as follows :- Inlet Pipe - LOP.E.55051. Existing Nozzle E.55043… | ||
| Scan177 | Requesting the manufacture of a modified induction pipe fishtail and packing piece for a specific engine. | ||
| View original record | 85070 To RHC. from Hs/Rm. Hs/Rm.3/KT. 23.6.31. Will you please make a modified induction pipe fishtail and packing piece for the Japan engine to V.616 and V.617. Hs/Rm. | ||
| Scan178 | Drawings for an induction system intended for testing 25HP single carburetters. | ||
| View original record | BY. FROM E. X5070 El/M/12.9.31. C. to SG. WOR. HS. X.5070. X.5080. J. 1. - INDUCTION SYSTEM. Last Sat. we sent you the originals of LeC. 2919. ans 2945., the first shewing the induction pipe it was… | ||
| Scan179 | Requesting an alteration to the Japan induction pipe. | ||
| View original record | X5070 To EHC. from Hs/Rm. Hs/Rm.3/KT.27.10.31. Will you please alter the Japan induction pipe as per V.1236. Hs/Rm. | ||
| Scan180 | Record of a telephone conversation regarding modifications to the oil flow, sump connections, and induction system. | ||
| View original record | c. E. (Strikethrough) c. Hs. c. BY/CS. c. BY/Cgh. c. BY/SS. X5070. BY.3/G. 28.10.31. X5190. X5070. TELEPHONE CONVERSATION WITH WW. 27.10.31. JAPAN 111. The following information was given to me over… | ||
| Scan181 | Single carburetter scheme and the required exhaust connection modifications. | ||
| View original record | - 2 - BY.3/G.28.10.31. we shall come to a single carburetter scheme later. We would then blank off either the single or the two exhaust connections through the head according to whether we were using… | ||
| Scan182 | Design of J.3 induction pipes and carburetter systems. | ||
| View original record | Y507D. By.a from Hs/Rm. Hs/Rm.1/AD30.11.31. J.3. INDUCTION PIPES. We shall shortly be issuing a report on induction systems. The main point we have recently established is that we cannot run twin… | ||
| Scan183 | Requesting a drawing for a new induction pipe for the J.1 project, detailing requirements for carburetter silencers and air intake. | ||
| View original record | 85070. E. from Hs/Rn. Hs/Rn. 2/KT.10.10.32. INDUCTION PIPE FOR J.1. Now that this unit will be wanted for Bensport, we should like a nicely designed induction pipe on the lines of the one that you… | ||
| Scan184 | Requesting the issue of details for Induction Pipe LeC.3098 to enable patterns to be put in hand. | ||
| View original record | 85070 To BY. from E. c. Wor. Hs. RHC. E.7/HP.7.11.32. J.2. Induction Pipe. -------------------- We send you herewith: LeC.3098 - showing the above. We should be glad if you could issue the detail for… | ||
| Scan185 | Preliminary arrangement of a J.l. Induction Pipe. | ||
| View original record | r5070. To Hs. from E/JNR. c. Wor. E/JNR.3/HP.12.11.32. J.l. Induction Pipe. We send you herewith: LeC.3277 - a preliminary arrangement of the induction pipe. We think there is all the information you… | ||
| Scan186 | Dispatch of an Induction Pipe for a J.1. Engine. | ||
| View original record | Y5070 To BY. from E/JNR. c. WOT. Hs. E/JNR.2/HP.24.11.32. re J.l. Engine. Please receive herewith: LeC.3277 Induction Pipe for the fitting of two 1-3/8" S.U. Carburetters. E/JNR. | ||
| Scan187 | Instructing a 4-port induction pipe for testing on a 20-HP head for the Spectre model. | ||
| View original record | COPY. X5070. To Hs. from E. c. Wor. By. E.3/HP.19.9.33. X4694 re Induction Pipe. We are instructing a 4 port Induction Pipe, for test on a standard 20-HP head, as discussed with you, as this is the… | ||
| Scan188 | Request to manufacture parts for experiments on a 20/25 HP induction pipe. | ||
| View original record | To RHC. from Hs/AJH. X5070 Hs/FJH.12/KW5.1.34. Experiments on 20/25 HP. Induction Pipe. Will you please make the following parts :- 2 Distance Pieces to Hs.1262. 2 " " to Hs.1263. 1 Adaptor to… | ||
| Scan189 | Request to produce two new cylinder blocks for the 20/25 induction system with an increased oval gas passage. | ||
| View original record | 45070 RHC. From Hs/CTS. Hs/CTS.1/MA.7.6.34. 20/25 INDUCTION SYSTEM. Will you please produce two new cylinder blocks to E.59726 incorporating LeC.3795 (60% increased oval gas passage.) Hs/CTS. | ||