Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Query regarding the potential adoption of Scheme 876, a modification to the 20-HP valve rocker mechanism. | ||
| View original record | Hs By Wor. from Mx. X.5090 ROLLS-ROYCE LTD. DERBY R Mx5/T4. 4.27 Scheme 876. Modification to Valve Rocker Mechanism. 20-HP Is there any prospect of the above scheme being adopted please? Hs [STAMP]… | ||
| scan0002 | 20 HP engine power development, focusing on camshaft experiments. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. c. to OY. V5090 Hs/ACL1/LG23. 5. 27. 20 HP. RR. POWER DEVELOPMENT : CAMSHAFT EXPERIMENTS. X5771 for prints In a previous report was shewn… | ||
| scan0003 | Engine performance comparing standard and long-duration camshafts, discussing power curves, B.M.E.P., and valve bounce. | ||
| View original record | contd :- -2- previous best results obtained with the standard camshaft. The carburetters used were two new Zenith triple diffusers similar to those employed on the Lorraine Dietrich but slightly… | ||
| scan0004 | Experiment showing that high induction pipe depression reduces the advantage possible with long duration cams. | ||
| View original record | contd :- -3- EXPERIMENT SHEWING THAT HIGH INDUCTION PIPE DEPRESSION REDUCES ADVANTAGE POSSIBLE WITH LONG DURATION CAMS. During the previous series of experiments - see report 20 HP. Power Development… | ||
| scan0005 | Camshaft modifications detailing the impact on engine power, consumption, and efficiency. | ||
| View original record | contd :- -4- The max. gain is 30.5 B.HP. or 56%. From the curve we see that we have not yet reached the max. power as the curve is still rising at 3000 r.p.m. The specific petrol consumption is also… | ||
| scan0006 | Engine performance test results, conclusions, and proposals for further development on the 20 HP and Phantom engines. | ||
| View original record | contd :- -5- (2) The speed of max. output was raised from 2650 r.p.m. to above 3000 r.p.m. (3) The B.M.E.P. was increased from 120 lbs/sq.in. to 124.3 lbs/sq.in. and the speed of max. B.M.E.P. was… | ||
| scan0007 | 20 HP engine test using a long-duration camshaft and stronger valve springs to increase power and prevent valve bounce. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to BY. Da. x5090 Hs/ACL1/LG26.5.27. 20 HP. POWER DEVELOPMENT - STRONGER VALVE SPRINGS WITH LONG DURATION CAMSHAFT. x5771 We have now made a test with… | ||
| scan0008 | The intention to trial Stromberg carburetters to gather information on low depression. | ||
| View original record | contd :- -2- In order to collect further information with regard to low depression in carburetters, we intend trying some Stromberg carburetters which are claimed to be good for acceleration and low… | ||
| scan0009 | Performance graph showing the increase in Brake Horse Power and Brake Mean Effective Pressure for a 20 HP engine after various modifications. | ||
| View original record | 20 H.P. POWER OUTPUT WITH THE FOLLOWING MODIFICATION TO STD. ENGINE. DEPRESSION AT 2750 R.P.M. REDUCED FROM 2.5" TO .7" HG. BY TWO ZENITH TRIPLE DIFFUSER CARBURETTERS. COMPRESSION RATIO 5.45 TO 1… | ||
| scan0010 | New cam forms for valves, spring pressure, and valve lift curves for various car and aero engines. | ||
| View original record | RG. BY. from R. and E. HS. c. to B.J. Wor. X5090 R2/M6.10.28. X.4003 X.5060 X.7090 X.3822 X.5090 X.4479 CAMS FOR F. H. and SS. AND 20 HP. RE. BY2/G4.10.28. Any new cam forms for valves to be fitted… | ||
| scan0011 | Practical considerations for camshaft design, including valve lift curves and floating speed. | ||
| View original record | To Hs/Tsn. from E. 45090. 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… | ||
| scan0012 | Valve timing and camshaft design for the 20 HP car. | ||
| View original record | R. c. Sg. c. Wor. c. Hs. c. DA. X5090 BY1/G. 8.6.29. CHINA. VALVE TIMING - RE CAMSHAFT. ---------------------------------- X4090 X5090 X1M40 Referring to R1/M5.6.29., we had already in anticipation of… | ||
| scan0013 | Performance improvements for the 20 HP car, focusing on pistons, camshafts, valves, and exhaust systems for experimental chassis. | ||
| View original record | HS. From R. c. to Sg. Wor. c. to By. RHC. X5090 R.3/M11.10.29. X.5770 X.5090 X.5771 20 HP. CARS (CONTINUED.) The third item - i.e. to improve the performance of the 20 HP. - is as follows, (agreed by… | ||
| scan0014 | Assumed power increases for large and small bore engines, and the fitting of cutouts to 20 HP models. | ||
| View original record | -2- manufacture. It is assumed that the present large bore engine will be giving a maximum power of 53 BHP. with silencer fitted instead of the 45 BHP. of the small bore engine, and that the… | ||
| scan0015 | Comparison of power output and performance between 116° and 110° camshafts on the 'China' engine. | ||
| View original record | COPY. x5090. To R. From Hs/ACL. c. Sg. c. WOr. E. c. to Da. By. X.5771. X.5090. Hs/ACL2/AD5.11.29. "CHINA" ENGINE - CAMSHAFT COMPARISONS ON THE HIGHER OUTPUT ENGINE. We have completed a test on the… | ||
| scan0016 | Camshaft and engine performance tests, discussing detonation, compression ratios, and fuel doping. | ||
| View original record | Hs/ACL2/AD5.11.29.Contd. -2- Found that the 116° was the better camshaft if each were compared in conjunction with a compression ratio having a similar margin from detonation at low speeds. It might… | ||
| scan0017 | Blueprint graph comparing the open exhaust power curves of a 116° camshaft versus a standard 110° camshaft on a 'China' engine. | ||
| View original record | V. 739. CHINA ENGINE - CAMSHAFT COMPARISONS ON THE HIGHER OUTPUT ENGINE. OPEN EXHAUST POWER CURVES. ENGINE DETAILS: COMP'N RATIO 5.25/1. LARGER EX & IN VALVES & PORTS. 4G 1/2 LARGER 20H.P.R.R. CARB.… | ||
| scan0018 | Comparison of a 116° camshaft versus the standard camshaft on a Standard China Engine, detailing performance differences. | ||
| View original record | X.5090. xs.771. x5090. To R. from Hs/ACL. c. SS. c. H.r. E. c. Da. Hy. Hs/ACL9/ADL2.11.29. 116° CAMSHAFT ON STANDARD CHINA ENGINE. We have compared the 116° camshaft (E.55362) with the Std. 116°… | ||
| scan0019 | Continued page discussing the performance of a 115° camshaft and recommending the standard camshaft. | ||
| View original record | HS/ACL.9/AMR.11.29 contd. -2- the benefit. Therefore where conditions are such that the 115° camshaft does not give its best at max. speed - due to valves, ports or induction system - it would seem… | ||
| scan0020 | Graph comparing the performance of a 110° and a 116° camshaft on a standard 'China' engine. | ||
| View original record | CAMSHAFT COMPARISON (STD. "CHINA" ENGINE) ENGINE Nº GOS-C5 (3.250" BORE). COMPRESSION RATIO = 4.75. STANDARD INDUCTION SYSTEM. STANDARD 20H.P. CARBURETTOR. OPEN EXHAUST. BRAKE HORSE POWER. B.M.E.P.… | ||
| scan0021 | Experiment comparing long (116°) and short (110°) duration camshafts on a 20/25HP engine to analyze low power causes. | ||
| View original record | HS. ) FROM R. E. ) BY. ) X5090 R2/M6.11.29. Copy to - SG. Copy to - WOR. STANDARD 20/25HP. HS' TEST WITH (a) LONGER DURATION CAMS 116° " " (b) SHORT " " 110° This experiment I think shews that the… | ||
| scan0022 | Adjustments to camshaft duration and tappet clearance to address low engine power at high speeds. | ||
| View original record | HS. From R. c. to Sg. c. to Wor. c. to By. 25HP. 'CHINA'. x 5090. R.3/M16.11.29. X.5770 X.5090 Long duration cams should be tried at 110°, 112°, or 114°, as well as the 116°. This gives more lap,… | ||
| scan0023 | Comparison of different camshafts on the 'Japan' engine and related test results. | ||
| View original record | X 5090. To R. From Hs/ACL. c. HS. c. Wor. E. c. Da. Ry. Hs/ACL2/A19.11.29. CAMSHAFT COMPARISONS ON "JAPAN" ENGINE. x5771 x5090 We have now compared the 116° camshaft with the std. 110° on the "Japan"… | ||
| scan0024 | B.M.E.P. readings at various RPMs for a specific camshaft configuration and plans for further testing. | ||
| View original record | HS/ACL/AD19.11.29 contd. -2- speeds of 2000 and 2500 R.P.M. At lower speeds there was no difference. It will be remembered that the camshaft had the Std. cam forms except that the inlet had a 14°… | ||
| scan0025 | Graphical comparison of two camshafts (110° and 116°) on Engine N° IV G-8, plotting Brake Horse Power and B.M.E.P. against engine RPM. | ||
| View original record | CAMSHAFT COMPARISON - "JAPAN" ENGINE N° IV G-8 (3.250" BORE) COMPRESSION RATIO = 5.25. OVER-TYPE SLOTTED INDUCTION PIPE. 46% LARGER 20 HP. R.R. CARBURETTOR. OPEN EXHAUST. Graph Data: Left Y-Axis:… | ||
| scan0026 | Test report on a 112º long duration camshaft for the 'China' engine, comparing performance against other camshafts. | ||
| View original record | To R. From Hs/ACL. c. to SG. WOR. c. to E. Da. c. to Ey. X5090. HS/ACL.2/WJ.20.12.29. X5090 X5771 112º LONG DURATION CAMSHAFT (CHINA). Tests have now been carried out on the "China" engine with a long… | ||
| scan0027 | Performance graph comparing different camshaft configurations for Engine No GOS-C1. | ||
| View original record | 112° LONG DURATION CAMSHAFT (CHINA). ENGINE No GOS-C1. STANDARD INDUCTION PIPE. ENLARGED INDn PASSAGE THRO' BLOCK. 17% LARGER 20 HP R.R. CARBURETTOR. COMPRESSION RATIO = 5.25. OPEN EXHAUST. 112°… | ||
| scan0028 | Improvements and testing for a 20 HP long duration camshaft. | ||
| View original record | CHP. From Hs/Rm. x5090 Hs/Rm.4/MJ.18.3.30. 20 HP. LONG DURATION CAMSHAFT. x5771 In curve V.761 you shew the 112º camshaft to give a marked improvement in performance above 1750 R.P.M. At 500 R.P.M.… | ||
| scan0029 | Instruction to fit a 112° camshaft to engine GOS.C.1 and subsequently fit the engine into car 12-G4. | ||
| View original record | RHC. From Hs/Rm. X5090 Hs/Rm. 3/MJ. 25.4.30. Will you please fit the 112º camshaft E.55640 to engine number GOS.C.1. As soon as this engine is finished will you please arrange to fit it in 12-G4 in… | ||
| scan0030 | Table of ignition advance settings at various engine RPMs. | ||
| View original record | X5090 Ignition Advance (5.75 "China") | R.P.M. | Necessary Adv. for Max. Power | Necessary Adv. for 2% Drop. | Actual Advance (Static Setting = 10°) | |---|---|---|---| | 3500 | 47° | 40° | 40° | |… | ||
| scan0031 | Graph of engine compression pressures versus RPM, comparing different camshaft configurations. | ||
| View original record | 25-4-30 V841. 112° CAMSHAFT - COMPRESSION PRESSURES ENGINE N° Gos-C1. STANDARD INDUCTION SYSTEM. COMPRESSION RATIO = 5.75. CURVES ARE CORRECTED TO N.T.P. & GIVE AVERAGE VALUES OF SIX CYLINDERS… | ||
| scan0032 | Performance comparison between long and short duration camshafts at different compression ratios. | ||
| View original record | To R. From Hs/Rn. c. to Ag. S. c. to Ey. Da. c. to Nor. X5090 Hs/Rn.1/MJ. 26.4.30. X5090 K5771 LONG DURATION CAMSHAFTS. Previously these have always been compared with the short duration camshafts at… | ||
| scan0033 | Test report on a 112° long-duration camshaft, comparing performance with different compression ratios and valve timings. | ||
| View original record | To R. From Hs/CHP. c. to Sg. E. c. to Ev. Sh. c. to Wor. Hs/CHP.1/AJ.26.4.30. 112° LONG DURATION CAMSHAFT ("CHINA"). This camshaft (E.55640) has been tested previously and a report circulated (dated… | ||
| scan0034 | Analysis of engine performance concerning power, detonation, and ignition settings with different camshafts and compression ratios. | ||
| View original record | -2- Hs/CHP.1/ML.26.4.30.Cotnd. (with 5.75 C.R.) shews a marked increase in power over the standard engine at speeds above 2000 R.P.M. From the point of view of detonations, the 112º shaft in the 5.75… | ||
| scan0035 | Performance graph comparing Brake Horse Power and B.M.E.P. for different camshaft and high compression configurations. | ||
| View original record | 112° CAMSHAFT & HIGH COMPRESSION "CHINA". ENGINE N° GOS-C1. STANDARD INDUCTION MANIFOLD. STANDARD CARBURETTOR (1 7/8%). COMPRESSION RATIO = 5.75 OPEN EXHAUST. 112° CAMSHAFT, E55640. INLET OPENS 6°… | ||
| scan0036 | Performance graph comparing Brake Horse Power and B.M.E.P. for different camshafts on a GOS-C1 engine. | ||
| View original record | 112° LONG DURATION CAMSHAFT (CHINA) V761 ENGINE N° GOS-C1. STANDARD INDUCTION PIPE. ENLARGED INDN PASSAGE THRO' BLOCK. 17% LARGER 20HP R.R. CARBURETTOR. COMPRESSION RATIO = 5.25. OPEN EXHAUST. 112°… | ||
| scan0037 | Test report comparing the performance of a long duration 112 degree 'China' camshaft with standard and 'Japan' configurations. | ||
| View original record | NOT SENT OUT. To R. From Hs/Rm. c. to Sg. Wor. c. to Da. E. c. to Ev. X5090 Hs/Rm.6/MJ.19.5.30. X.5090. X.5771. X.5770. 112° CAMSHAFT 'CHINA' We have tried the long duration camshaft on the road in… | ||
| scan0038 | Note on the comparative effects of long duration camshafts with single and double throat carburetters. | ||
| View original record | -2- that the long duration camshaft does not have quite such a marked effect with double throat ramming carburetters as with a single carburetter. This agrees with our expectations and other peoples… | ||
| scan0039 | Twin carburetter tests and camshaft comparisons conducted on the 'Japan' engine. | ||
| View original record | COPY. To R. From Hs/ACL. c. to Sg. Wor. c. to Rs. E. c. to Da. Ey. X5090 Hs/ACL.1/MJ.23.5.30. X.5080 X.1053 X.5090 X.5070 X 5230 TWIN CARBURETTER TESTS & CAMSHAFT COMPARISONS ON "JAPAN" ENGINE We have… | ||
| scan0040 | Test report on engine performance relating to riser pipes, induction, hot spots, and choke sizes. | ||
| View original record | -2- Hs/ACL.1/MJ.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… | ||
| scan0041 | Engine performance tests comparing different duration camshafts and carburettor setups. | ||
| View original record | -3- Hs/ACL.1/MJ.23.5.30.Contd. 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… | ||
| scan0042 | Summary of engine experiments on 'Japan' regarding 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… | ||
| scan0043 | Table of actual valve timing data for various camshaft settings from twin carburettor tests on the 'Japan' engine. | ||
| View original record | ACTUAL VALVE TIMING TAKEN ON ENGINE WITH .020 TAPPET CLCE. TABLE DATA: CAMSHAFT | 116° | 112° | 110° --- IN. OPENS. | 13° A.T.C. | 7° A.T.C. | 16° A.T.C. IN CLOSES | 48° A.B.C. | 43° A.B.C. | 37°… | ||
| scan0044 | 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." 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 = B.H.P.… | ||
| scan0045 | Performance graph comparing different camshafts on the 'Japan' engine configuration, plotting B.HP and B.M.E.P. against R.P.M. | ||
| View original record | CAMSHAFT COMPARISONS ON "JAPAN" TWIN ZENITH CARBS - 26 M/M CHOKES. SMALL INDN PIPE (1.25 INT. DIA) 5.25/1 COMPN RATIO. OPEN EXHAUST. V868. B.H.P. (CORRECTED FOR T & PRESS) B.M.E.P. lbs/sq" R.P.M. 112°… | ||
| scan0046 | Performance comparison graph of Twin Zenith versus Standard Chassis carburetters with different 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. B.H.P.… | ||
| scan0047 | Blueprint detailing the arrangement of a twin Zenith carburettor induction pipe for a 'Japan Engine'. | ||
| View original record | V870. INLET TO HOT SPOT 1.250" INSIDE DIA. 3.125. 2.062 1.400 DIA THROTTLE BORES OUTLET FROM HOT SPOT PIPES TAPER FROM 1.250 DIA TO 1.400 DIA TO MATCH CARB THROTTLES ARRANGEMENT OF TWIN ZENITH CARB ON… | ||
| scan0048 | Drawing LeC. 2864, showing details for the Japan 3 valve rocker gear and cylinder head. | ||
| View original record | BY. FROM E. SECRET. X5090. E2/M9. 2. 31. C. to SG. WOR. HS. C. to HY. RHC. JAPAN 3. VALVE ROCKER GEAR & DETAILS OF CYLINDER HEAD. X5090. X5050. We attach herewith LeC. 2864. shewing the above. Would… | ||
| scan0049 | The valve rocker gear and cylinder head for the 'Japan 3' engine. | ||
| View original record | SECRET. JAPAN 3. VALVE ROCKER GEAR & DETAILS OF CYLINDER HEAD - Lec. 28 The above drawing completes and brings up-to-date the information with respect to the valve rocker gear and cyl. head. Attention… | ||
| scan0050 | Proposing changes to a casting's plugging methods and inspection holes, with sketches. | ||
| View original record | We propose to make the casting so that it is suitable for either method of plugging as shewn by the sketches. At the same time this form of boss deletes external moulding features which may be… | ||
| scan0051 | Request to manufacture camshafts for a 25 HP Japan engine. | ||
| View original record | COPY. X5090. To RHC. From Hs/Gry. Hs/Gry.6/KT.12.5.31. Will you please make camshafts to the accompanying specifications for use on 25 HP. Japan engine. Hs/Gry. | ||
| scan0052 | Blueprint of a camshaft profile and its associated timing diagram for a 25 HP engine. | ||
| View original record | Hs 349 CAMSHAFT 25 HP EXHAUST CAM LEADS INLET CAM BY 118° CAM FORM TO E 36951 1.314 .950 DIA -2 1 EX V L OF KEYWAY DIRECTION OF ROTATION A EX IN 2 EX 4 IN MR +39 +19 118° 60° 6° | ||
| scan0053 | Comparative table of valve train specifications for 25HP Japan and Phantom II engines. | ||
| View original record | First Table: | Engine. | Wt. of valve & cap. | Wt. of push rod. | Cam-shaft. | Rockers. | At max. accn of valve. | Force in push rod at 3000 R.P.M. |… | ||
| scan0054 | Requesting the production of two camshafts for a 25 HP engine using Kestrel cam forms. | ||
| View original record | Copy. x5090. To RHC. From Hs/Rm. Hs/Rm. 7/KT. 12. 5. 31. We want to make cams for the 25 HP. on the same lines as those produced for the 40/50 only using the Kestrel short duration high lift cam… | ||
| scan0055 | J.1 specification document detailing proposed changes to an engine, flywheel, gearbox, engine mounting, and camshaft. | ||
| View original record | SG. HS.) FROM R. BY. C. to WOR. C. C. to RHC. HY. X5090 R2/M21.5.31. J.1. SPECIFICATION. A. 5770. X. 5090. ENGINE. 3.25" X 4.5" - same as 25HP. - no change to crankshaft dimensions, but to have big… | ||
| scan0056 | Notes and timing diagrams for 'Try No 1 Camshaft' and other vehicle components including the back axle, brakes, and engine head. | ||
| View original record | TRY No 1 CAMSHAFT (2) Ex. cam to Sch. 1158. In. cam to Sch. 1153. In. cam to Sch. 11 58. Ex. cam new curve 63 div. long. No 1. EXCAM 61 DIV INCAM 57 DIV ISB SBEX Angle between cams 114º No 2. EXCAM 63… | ||
| scan0057 | Design considerations for petrol pumps, radiators, and carburetters. | ||
| View original record | (3) we understood however from the recent memos, that you feared interference between some of the exhaust beats affecting volumetric efficiency. We are glad to hear this is not so. PETROL PUMP. There… | ||
| scan0058 | Power output results from testing different camshafts for the Japan I project. | ||
| View original record | To R. From Hs/Rm. c.c. to ~g. Wor. c.c. to E. Da. c.c. to BY. Hs/Rm.8/KT.29.5.31. JAPAN I. POWER OUTPUT. With reference to R2/M21.5.31. we have tested three camshafts to the forms you mention, i.e.… | ||
| scan0059 | Analysis of engine performance concerning valve timing, cams, and silencers for various models, including diagrams of inlet and exhaust duration. | ||
| View original record | T.DC. 11 112º 49 49 Inlet duration 235º 7º Exhaust duration 227º 116º 54 48 .013" tappet clearance. Exhaust cams to Sch.1158 Inlet cams to Sch.1153 On the other hand with any sort of silencer the… | ||
| scan0060 | Performance graph comparing a twin Zenith carburettor against a standard chassis carburettor with different camshafts. | ||
| View original record | TWIN ZENITH CARBURETTER ON 'JAPAN'. COMPARISON WITH STD CHASSIS CARBURETTER. ZENITH USED WITH 26 M/M CHOKES - SMALL BORE INLET PIPE - 112° & 116° CAMSHAFTS - 5.25/1 COMPN RATIO. OPEN EXHAUST. B.H.P.… | ||
| scan0061 | Performance graph comparing a Twin Zenith carburettor against a Standard carburettor with different camshaft configurations. | ||
| View original record | TWIN ZENITH CARBURETTER ON (JAPAN IV G6) V914 COMPARISON WITH STD CARBURETTER. ZENITH RUN WITH 26 m/m CHOKES. SMALL BORE INDUCTION PIPE COMPLETE STANDARD 25HP EXHAUST SILENCING SYSTEM. STANDARD 110°… | ||
| scan0062 | Engine power outputs, detailing test results and required component improvements for various models. | ||
| View original record | Copy. 85090. To R. From Hs. c. to Sg Wor. c. to E. Da. c. to By. PN. HS.4/KT.30.5.31. X.5090. X.7090. X.5770. X.7770. ENGINE POWERS. We have been able to obtain a maximum of 180 HP. from a P.II.… | ||
| scan0063 | Conclusions on camshaft design, performance limitations, and potential improvements for car engines. | ||
| View original record | [Handwritten: Y5090] To E. From Hs/Rm. Hs/Rm.1/KT. 5.6.31. CAMSHAFT. [Handwritten: P II & 25 H.P] [Handwritten: 87090 Y5090] With further reference to our conversation this afternoon, the conclusions… | ||
| scan0064 | Permissible duration for inlet valve opening in car engines 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. | ||
| scan0065 | Suitability and potential modification of R. engine camshafts for car work. | ||
| View original record | HS. } FROM R. & E. BY. } X5090 R1/M5.6.31. Copy. c.t o 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 fear: (1)… | ||
| scan0066 | Practical limitations of modifying cams and valve areas for luxury car engines. | ||
| View original record | X5090 HS. FROM R. C. to SG. WOR. CAMS AND VALVE AREAS. R1/M9.6.31. 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… | ||
| scan0067 | Instruction to produce a new set of .2 longer valves for the 25 HP 'Japan' unit. | ||
| View original record | 75090 To RHC. From Hs/Rm. Hs/Rm.8/MJ.29.6.31. VALVES FOR HIGH LIFT ROCKERS 25 HP. Will you please make another set of .2 longer valves for the 25 HP. 'Japan' unit, as instructed in BY/C56/EH.14.5.31.… | ||
| scan0068 | Prints for 25 HP high lift rockers to give increased valve lift. | ||
| View original record | x5090. To E. From Hs/Gry. Hs/Gry.1/MJ.29.8.31. 25 HP. HIGH LIFT ROCKERS. Herewith prints of the pedestals and rockers we use on the 25 HP. to give increased valve lift. Hs/H.Grylls. Attached: Print of… | ||
| scan0069 | Technical discussion on achieving increased valve lift for the 25HP 'CHINA' engine by altering rocker ratios and cams. | ||
| View original record | HS. BY. } FROM R & E. X 5090 R1/112.9.31. C. to SG. WOR. RG. 25HP. 'CHINA' & INCREASED VALVE LIFT. We do not agree to shifting the centre of the rocker so much as to make the ratio 1.34 instead of… | ||
| scan0070 | Telephone conversation note detailing camshaft modifications for 20/25 HP and Phantom II engines. | ||
| View original record | E. (crossed out) Hs. BY/Cgh. BY/SS. RECEIVED 15 SEP 1931 x5090. x7090. x7170. BY.7/G. 4.9.31. TELEPHONE CONVERSATION BETWEEN WEST WITTERING AND BY. - FRIDAY 4TH. SEPTEMBER 1931. 20/25 HP. CAMSHAFTS.… | ||
| scan0071 | Camshaft and carburetter improvements, specifically for the 20/25 model. | ||
| View original record | - 2 - c/- Improved camshaft. d/- Twin carburetters. From our side we pointed out that instructions for the two single carburetters for the 20/25 had been completely issued to Experimental Department,… | ||
| scan0072 | J.3. valve rocker and the calculation of its lift. | ||
| View original record | x5090 BY. FROM E. E1/M23.9.31. C. to SG. WOR. HS. J.3. VALVE ROCKER CALCULATION OF LIFT. Please find herewith LeC. 2956. shewing the above. This drawing is in agreement with LeC. 2938. on which we… | ||
| scan0073 | New camshaft design for a 25 HP engine, comparing theoretical and practical valve timings. | ||
| View original record | Ry, from Hs/Rm. c. E. Y5090. Hs/Rm.1/AD24.9.31. NEW CAMSHAFT FOR 25 H.P. [Left Diagram] 1.5 10.8 .013 clrce. 48 50.5 Inlet Duration 226.5 Exhaust " 241.5 [Right Diagram] 3.2 10.6 46.4 46.0 Inlet… | ||
| scan0074 | Summary of tests on power output for the 'Japan' project, detailing carburettor, induction, and valve timing adjustments. | ||
| View original record | X5090. To R. From Hs/Rm. c. to Sg. Wor. c. to Da. E. c. to By. Ha/Rm.6/WJ.24.9.31. X5771. POWER OUTPUT - JAPAN. We have carried out a number of tests on 'Japan' with a view to obtaining information as… | ||
| scan0075 | Summary report on tests of induction pipe capacity, carburetter performance, and inlet valve clearance. | ||
| View original record | -2- Hs/Rm.6/WJ.24.9.31.Cont'd. Induction Pipe Capacity. Rm.37. Is a confirmatory test of induction pipe capacity effect. Effect of Carburetter Position. Rm.38. Shows the characteristic power curve… | ||
| scan0076 | Graph comparing the performance of three different carburettors based on B.HP and B.M.E.P. against R.P.M. | ||
| View original record | RM. 28 19/8/31 CARBURETTER COMPARISON ON CHINA 5-1 C/R HIGH OUTPUT COIL 110° SHAFT ① S.U. CARB 1 5/8 THROTTLE DIA ② SOLEX CARB. 1 5/8 THROTTLE DIA. 29 MM CHOKE ③ STD 15% LARGER R.R. 1 1/2 THROTTLE DIA… | ||
| scan0077 | Performance chart and specification sheet for the 'Japan Unit' engine. | ||
| View original record | JAPAN UNIT. R.M. 29. COMP RATIO 5.35-1 HIGH LIFT ROCKERS .395" INLET VALVES 1.4" DIA. THROAT. 112° CAMSHAFT OPEN EXHAUST CLAUDEL CARBS 26 M.M. CHOKES. TIMING .013 CLCE. B.H.P. R.P.M. B.M.E.P INS HG… | ||
| scan0078 | Performance comparison chart for different carburettor arrangements on a Japan Unit engine. | ||
| View original record | R.M. 30 18/9/31 COMPARISON OF CARBURETTER ARRANGEMENTS JAPAN UNIT. 112° CAMSHAFT OPEN EXHAUST C/R 5.35 VALVE LIFT .395 ① 2 CLAUDELS RAMMING PIPES ② 2 ZENITHS NON RAMMING PIPES 26 M/M CHOKES… | ||
| scan0079 | Graph plotting the effect of increasing induction pipe capacity on engine performance, showing B.HP vs R.P.M. | ||
| View original record | RM. 34. JAPAN EFFECT OF INCREASING INDUCTION PIPE CAPACITY TWIN CARBS. ENGINE SPECIFICATION AS ON R.M. 30 TWIN ZENITH CARB 26 M.M. CHOKES 112° CAMSHAFT OPEN EXHAUST .394 VALVE LIFT. B.H.P. R.P.M.… | ||
| scan0080 | Graph comparing engine performance with two different timing alterations on a 112° camshaft. | ||
| View original record | COMPARISON OF TIMING ALTERATIONS ON 112° CAMSHAFT WITH TWO CLAUDEL CARBS. INLET VALVE DIA. 1.4 C/R 5.13-1 OPEN EXHAUST 112° CAMSHAFT STANDARD ROCKERS. HEAD MACHINED TO GIVE MINIMUM CLCE OF ROUND INLET… | ||
| scan0081 | Graph comparing induction pipe capacities for a Japan Unit based on different engine configurations. | ||
| View original record | RM37 COMPARISON OF INDUCTION PIPE CAPACITIES JAPAN UNIT. INLET VALVE DIA. 1·40" E. 56851. C/R 5·13-1 OPEN EXHAUST 112° CAMSHAFT STANDARD ROCKERS. 2 CLAUDELS SHORT RAMMING PIPES. HEAD MACHINED TO GIVE… | ||
| scan0082 | Performance comparison graph for single versus double Claudel carburettors. | ||
| View original record | COMPARISON OF SINGLE & DOUBLE CLAUDEL CARBS. RM 38 INLET VALVE DIA 1.4 C/R 5.13-1 OPEN EXHAUST 112° CAMSHAFT .395 VALVE LIFT MIN: CLCE ROUND INLET VALVE .275" Single Double B.H.P. R.P.M. B.M.E.P… | ||
| scan0083 | Close-up, side-view photograph of an installed automobile engine. | ||
| View original record | No text found on the document. | ||
| scan0084 | Six photographs showing various engine intake manifold and carburettor arrangements. | ||
| View original record | ", | ||
| scan0085 | Technical memorandum discussing car engine performance, with conclusions on inlet valves, cam design, and timing. | ||
| View original record | X5090 R3/M28.9.31. HS.) FROM R. BY.) C. to SG. WOR. E. CAR ENGINE PERFORMANCE. X.5090. X.7090. At the moment the following conclusions have been agreed to: (1) That large inlet valves with ample… | ||
| scan0086 | Request to manufacture a 25 HP camshaft according to an accompanying sketch. | ||
| View original record | X5090. RHC. From Hs/Gry. Hs/Gry.5/MJ.28.9.31. 25 HP. CAMSHAFT. Will you please make a camshaft to the accompanying sketch (Hs.444). Hs/H.Grylls. | ||
| scan0087 | Blueprint detailing the valve timing and cam positions for a 25 HP camshaft. | ||
| View original record | Hs 444 EXHAUST CAM LEADS INLET CAM BY 112° INLET AND EXHAUST CAMS TO E 55358 OTHER DIMENSIONS TO E 55640 VALVE TIMING .013 CLEARANCE 25 HP CAMSHAFT DIRECTION OF ROTATION V/L OF KEYWAY Main Diagram… | ||
| scan0088 | Specifications for the adaption of a Kestrel short duration high lift camshaft. | ||
| View original record | 85090. 25 H.P. Adaption of Kestrel short Duration High Lift Camshaft E.36951. BASE O of this cam .950 instead of 1.050 We are therefore using a square cam follower .050 deeper and of radius .750 to… | ||
| scan0089 | Change in cam angle and timing for the 20/25 HP engine. | ||
| View original record | FILES. X5090 20/25 HP. HIGH LIFT CAMS. If we make the angle between the cams 112º instead of 110½º on the new camshafts E.57177, which we have issued experimentally as per R's memos. we should get the… | ||
| scan0090 | Correction note regarding a report on power output for Japan, clarifying units of measurement and test parameters. | ||
| View original record | X5090. From Hs/Rm. Sg. Wor. Da. E. o By. Hs/Rm.9/MJ.2.10.31. Re. POWER OUTPUT - JAPAN. X.5771. X.5090. Please note that in report Hs/Rm.6/MJ.24.9.31 the induction pipe depression in every case is ins.… | ||
| scan0091 | Internal memorandum analysing the results of tests on 25 HP power output, specifically concerning increased valve lift and clearance. | ||
| View original record | COPY. X5090. To E. From Hs/Rm. Hs/Rm.2/AD5.10.31. X.5771 X.5090. X.5080. 25 HP. POWER OUTPUT. Increasing Valve Lift. We have been analysing the curves on increased valve lift. RM.44 These Curves shew… | ||
| scan0092 | Performance graph comparing high and low lift rockers using a single carburettor Japan unit. | ||
| View original record | RM 40 COMPARISON OF HIGH & LOW LIFT ROCKERS WITH SINGLE CARB. JAPAN UNIT INLET VALVE DIA 1.4 C/R 5.13/1 OPEN EX. 112° CAMSHAFT E 55640 CLCE (MIN) OF .225 MACHINED ROUND INLET VALVE VALVE LIFT .344… | ||
| scan0093 | Performance comparison graph of high and low lift rockers with different valve timings and configurations. | ||
| View original record | R.M.44 COMPARISON OF HIGH & LOW LIFT ROCKERS, WITH TWIN ZENITH CARBS. JAPAN UNIT. INLET VALVE DIA 1.4. OPEN EXHAUST 112º. CAMSHAFT F.55640. A. LIFT .395 LIFT .344 COMP. RATIO 5.35/1 TIMING TOO EARLY… | ||
| scan0094 | Comparison of high and low lift rockers with ramming using Claudel carburettors, showing performance graphs and valve timing diagrams. | ||
| View original record | R.M.145 COMPARISON OF HIGH & LOW LIFT ROCKERS WITH RAMMING CLAUDEL CARBS. JAPAN. A. C/R 5.15 HEAD MACHINED TO GIVE .225 CLCE ROUND INLET VALVE BEST TIMING FOR POWER 112° CAMSHAFT VALVE LIFT .395 VALVE… | ||
| scan0095 | Graph showing the effect of increasing clearance around the inlet valve on engine performance. | ||
| View original record | EFFECT OF INCREASING CLEARANCE ROUND INLET VALVE JAPAN OPEN EXHAUST 112º CAMSHAFT E.55640 .344 VALVE LIFT 2 CLAUDELS 26 M/M CHOKES RAMMING PIPES COMPRESSION RATIO 5.35 Top Graph: VALVE LIFT .344 SOLID… | ||
| scan0096 | Graph showing the effect of increasing clearance around the inlet valve on engine performance with twin Zenith carburettors. | ||
| View original record | R.M.47 EFFECT OF INCREASING CLEARANCE ROUND INLET VALVE JAPAN TWIN ZENITH CARBS. OPEN EXHAUST 112° CAMSHAFT E.55640 1 1/4" DIA. INLET VALVES TIMING TOO EARLY FOR MAX: POWER C/R 5.35 VALVE LIFT .344"… | ||
| scan0097 | Sketch showing modifications to a Japan Cylinder Head to give increased clearance around the inlet valves. | ||
| View original record | BEFORE MACHINING INLET <-> 1.500 DIA MOD HEAD .350 Rd .150 1.000 Rd 1.125 Rd SKETCH SHOWING MODIFICATIONS TO JAPAN CYLINDER HEAD TO GIVE INCREASED CLEARANCE ROUND INLET VALVES | ||
| scan0098 | Outlining the requirement for new type E.57177 camshafts for several existing engine units. | ||
| View original record | FHC. from Hs/Rn. x5090 Hs/Rn. 6/AD4.11.31. LATEST TYPE CAMSHAFTS. We want to fit our existing China units with new type camshafts E.57177. The one we most urgently require is camshaft in C.9 unit… | ||
| scan0099 | Carburetter design choices, favouring a single carburetter over the S.U. type. | ||
| View original record | X5080. EXTRACT FROM: Hs. ) FROM R. By. ) CAR DESIGN WORK. R.2/M.10.11.31. X5080 X7080 X1487 C. to SG. WOR. CARBURETTER. We are now all agreed that the single carburetter is the best for our work, and… | ||
| scan0100 | Use of long-toed cams and steel push rods to manage tappet clearance and reduce engine noise. | ||
| View original record | X5090 HS. FROM R. C. to SG. WOR. BY. TAPPET CLEARANCE. R4/M16.11.31. Sent off 19.11.31. X.7090 X.5090 For very many years we have tried to introduce a long toed cam as a means of getting silence for… | ||
| scan0101 | Cored hole in the crankcase wall to prevent oil buildup in the camshaft chamber. | ||
| View original record | BY. FROM E. C. to SG. WOR. HS. X5090. E1/M18.11.31. X. 5090 J. 3. VALVE ROCKER COVER AND OIL FILLER CAP. We send you herewith LeC. 2973 dealing with the above. To avoid holding up the oil in the… | ||
| scan0102 | Tests on tappet clearance and the resulting noise levels for the 40/50 standard camshaft. | ||
| View original record | To R. From Hs/Rm. c. to Sg. Wor. c. to Ry. [Handwritten] Y5090 Hs/Rm.3/MJ.24.11.31. TAPPET CLEARANCE. [Handwritten] X7090. With reference to R.4/M16.11.31. We have made some tests on tappet clearance… | ||
| scan0103 | Camshaft timing specifications for the 'Hot Stuff' Japan Unit. | ||
| View original record | X5090. FILES. CAMSHAFT REQUIRED FOR "HOT STUFF" JAPAN UNIT. 110.5º shaft. Two exhaust cams. Best timing on existing 112º shaft with high lift rockers. On this shaft duration of both cams is 240º.… | ||
| scan0104 | Technical memorandum regarding the standardization of higher lift camshafts and stronger valve springs for the 25HP engine. | ||
| View original record | By. c.Hs. Y5090. BY/SS4/N.24.11.31. Re: 25HP. Valve & Fittings - Valve Springs. x5060. Since it is intended to standardize the Higher Lift Camshaft and Stronger Valve Springs at an early date, the… | ||
| scan0105 | Comparing standard and proposed production valve springs for chassis. | ||
| View original record | -2- BY/SS4/N.24.11.31 Cont'd. This memo is issued in order for the Drawing Office to know clearly what they must instruct for production chassis. Comparison of Valve Springs. | | Std. Production… | ||
| scan0106 | Graph comparing the load, stress, and deflection characteristics of two 25 HP chassis valve springs. | ||
| View original record | Deflection in inches Load in lbs. Stress in lbs .8075 Initial deflection .330 lift .400 lift .160 Coil Clearance. .090 do do. Stress at large end of Spring increases to 102,000 lbs Choc. Spring Hs.451… | ||
| scan0107 | Blueprint comparing inlet, standard, and improved exhaust valves, with handwritten modification proposals. | ||
| View original record | TOP LEFT NOTES: Proposals. Bottom Washer. Remove .025 from Top to improve washer clearance. From lower Spring face .025 to improve spring coil clearance. Reduce diameter 1.400 to 1.350. TOP RIGHT… | ||
| scan0108 | Request to produce a new 'China' camshaft with modified timing for the exhaust cam. | ||
| View original record | R.H.C. From Hs/Rn. 8509 Hs/Rm.1/MA.9.12.31. NEW CHINA CAMSHAFT. Will you please produce a camshaft to the drawing E.57177 but with the exhaust cam. leading the inlet cam. by 113° instead of 110.5 as… | ||
| scan0109 | Power output improvements from tests on engines with higher compression pistons and different exhaust systems. | ||
| View original record | R. From Hs/sn. c. to SG. Wor. c. to E. Da. c. to Hy. Y5090 Hs/sn.3/14.10.12.31. X577) POWER OUTPUT IMPROVED CURVES. We have now had power curves off three further engines fitted with the higher… | ||
| scan0110 | Performance chart comparing the Brake Horsepower (BHP) of a CXI high-lift unit with three different manifold and exhaust setups. | ||
| View original record | UNIT FITTED TO 20 G.N CHINA. RM 53 POWER OUTPUT CXI UNIT HIGH LIFT CAMSHAFT E.57177 (110.5°) 5.76 C/R. KEY: ① CUT OUT OPEN ② SMALL MANIFOLD (1.6 DOWNTAKE) FRONT EXP BOX PII SILENCER 1.5" FISHTAIL ③… | ||
| scan0111 | Graph showing power output and compression pressure for a CTX Unit with various exhaust configurations. | ||
| View original record | POWER OUTPUT CTX UNIT CHINA R.M. 54 4/12/31 CAMSHAFT E.57177 (110.5°) C/R 5.74 STANDARD 15% LARGER R R CARBURETTER ① ------ OPEN EXHAUST ② --- --- C.O. OPEN ③ --.--.-- COMPLETE EXHAUST SYSTEM &… | ||
| scan0112 | Graph of engine power output curves against RPM for various exhaust configurations, including a valve timing diagram. | ||
| View original record | POWER OUTPUT CTR UNIT CHINA R.M. 55 CAMSHAFT E.57177 (110.5°) C/R 5.74 STANDARD 1 5/8" LARGER R.R. CARBURETTER ① -------- COMPLETE EXHAUST SYSTEM 1'6" PIPES P1 SHORT ② ------ SILENCER SMALL FRONT… | ||
| scan0113 | Power output chart comparing two configurations of the C.10 Unit for 19 G.IV. | ||
| View original record | POWER OUTPUT C.10 UNIT FOR 19 G.IV R.M. 57 ① CAMSHAFT E.57177 110.5° PITSONS E.57122 COMPRESSION RATIO 5.7 - 1 Valve Timing Diagram: 26°, .020 CLCE, IN, EX, 35°, 45.5 Shaft Drawing: 1.6 INSIDE DIA, P… | ||
| scan0114 | Request to produce a camshaft for a high output Japan unit, specifying a drawing number and angle between cam centres. | ||
| View original record | x5090. To RHC. from Hs/Rm. Hs/Rm.5/KT.17.12.31. CAMSHAFT FOR HIGH OUTPUT JAPAN UNIT. Will you please produce a camshaft for this unit having both cams machined to the exhaust cam form Drawing No.… | ||
| scan0115 | Request to produce a modified camshaft designated 'China Camshafts' with a specific timing. | ||
| View original record | X5090. To RHC. from Hs/Rm. Hs/Rm.1/KT.30.12.31. CHINA CAMSHAFTS. Will you please produce a camshaft to E.57177 but with the exhaust cam leading the inlet cam by 108°. Hs/Rm. | ||
| scan0116 | Calculations and timing diagrams for an improved camshaft design for China. | ||
| View original record | 85090. IMPROVED CAMSHAFT FOR CHINA. Ex. 10 11 IN 40 39 EXHAUST 104° B.T.D.C. EX. LEADS INLET BY 107.5° INLET CAM CENTRE 111° A.T.D.C. Inlet cam centre (180 + 34) / 2 + 6° A.T.D.C. = 111° A.T.D.C.… | ||
| scan0117 | Engine power improvements, including valve timing, superchargers, and tappet clearance. | ||
| View original record | E. ) FROM R. HS. } (At Le Canadel) BY. ) C. to - SG. WOR. RG. X5090. R2/M6.1.32. Sent from WW. 9.1.32. X5090 X7090 X4553 CAR WORK - ENGINE POWER. Good and sound progress is being made and I quite… | ||
| scan0118 | Standardisation of a camshaft with increased valve lift and timing. | ||
| View original record | RR 755 (10H) (8459. 24-10-30) 6/3185. COMPLETED. 16.2.32. X5090. STANDARDISATION of CHASSIS PARTS. Date 5.1.32. Description of Parts. CAMSHAFT .050" INCREASED VALVE LIFT. 110.5° BETWEEN CAMS. Origin.… | ||
| scan0119 | Standardisation document for a chassis part, specifying its first application and associated costs. | ||
| View original record | STANDARDISATION of CHASSIS PARTS EXPERIMENTAL DEPARTMENT. The number of the first chassis on which the new part will be fitted................. 176th in 'T' Date when chassis will be handed to… | ||
| scan0120 | Camshaft timing and performance tests for the 20-25HP (China) Unit. | ||
| View original record | For Files. X5090. 29. 2. 32. 20-25HP (China) Unit. (E.57177) 110.5º and 108º Camshafts. 110.5º Camshaft. In conjunction with 5.75:1 Comp Ratio, and standard carburetter. The most suitable timing takes… | ||
| scan0121 | Performance graph of B.HP and B.M.E.P. vs R.P.M. for a 20-25 HP China Unit engine with various valve timings. | ||
| View original record | V1320, 29-8-32, 20-25 H.P. CHINA UNIT, 5.75:1 COMP. RATIO, CAMSHAFT. E57177. (108°), STANDARD CARB., B.H.P., B.M.E.P., R.P.M., EARLY TIMING, LATE TIMING, C.I.S., TDC, BDC, EX., IN., 1°, 6.1°, 34.1°,… | ||
| scan0122 | Performance graph comparing B.HP and BMEP against R.P.M. for two different camshaft timing configurations. | ||
| View original record | 20-25 H.P. (CHINA) UNIT 5.75:1. COMP. RATIO CAMSHAFTS. E57177 STANDARD CARB. V1319 B.H.P. % BMEP R.P.M. 110.5° 108° STANDARD ENGINE Left Diagram: TDC EX. 7 8.5° IN. 41.2° 42° BDC 110.5° Right Diagram:… | ||
| scan0123 | Instruction to manufacture a camshaft for the J.3 unit with a specific cam form and angle. | ||
| View original record | X5090. By/Cgh. from Hs/Mths. Hs/Mths.1/ADl1.3.32. Will you please instruct a camshaft to be made for J.3. unit having inlet and exhaust cams to present exhaust cam form. The angle between the cams… | ||
| scan0124 | Analysis of experimental camshafts, focusing on inlet duration and valve timing. | ||
| View original record | E. From Hs/Rm. C. By. ________ X5090 x7090 HS/Rm.2/IA.18. 4. 32. CAMSHAFTS. We attach a complete analysis of the best camshafts that we have tried experimentally. The main point about J.III camshaft… | ||
| scan0125 | Camshaft design, valve timing, and engine test results. | ||
| View original record | -2- Hs/Rm.2/MA.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… | ||
| scan0126 | Summary of test bed measurements for seven different existing camshafts. | ||
| View original record | SHEET I ALL DURATIONS ACTUALLY BY TEST BED MEASUREMENT HS 585 ALFA ROMEO Circle 1: 27 10.8, EX, IN, .020 CLCE, 55.5, 40 INLET 233 EXHAUST 230.8 112° EXP CAMSHAFT W.W. E.57177 TWO EXHAUST CAMS Circle… | ||
| scan0127 | Blueprint comparing four alternative engine valve timings for Japan III, Peregrine, and Bensport cam forms. | ||
| View original record | SHEET II Hs 586 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… | ||
| scan0128 | Engine noise issues, focusing on tappet and camshaft design for improvement. | ||
| View original record | COPY. HS/RM. ) FROM R. E. DA. ) (At Le Canadel.) X5090. RL/M.11.5.32. Rec'd & despatched from WW. 20.5.32. C. to SG. WOR. C. to BY. RHC. re. J. Z. X5770. X634. Mr. Hives' memo of 4.5.32. to hand. Much… | ||
| scan0129 | Technical memo discussing issues and potential solutions for oil temperature, auto-adjustment, clutch, and crankshaft dampers. | ||
| View original record | (2) NOVEL. If difference of temperature is the trouble it has occurred to me that we might put an oil pipe the full length of the head inside, so that the oil would be the same temperature as the… | ||
| scan0130 | Technical memorandum discussing the design and materials for damper wheels, including a cross-section diagram. | ||
| View original record | (3) I have no confidence in going back to well lubricated ferodo unless it is free from gummy make up. (We could find what surface is best, and if dry is better then lubricated.) The material I have… | ||
| scan0131 | Technical memorandum comparing engine performance based on valve size, lift, and duration of opening for 3' Bore 'China' and 3.25' Bore 'J.1' engines. | ||
| View original record | XS990 To R. From Hs/Rn. c. to Sg. Wor. c. to Da. E. c. to By. Hs/Rn.10/KT. 24.6.32. XS770 VALVE SIZE, LIFT, & DURATION OF OPENING. With reference to HL/M.11.5.32. We have, during the past three years,… | ||
| scan0132 | Analysis of engine performance comparing valve sizes, camshaft duration, and turbulence effects between various engines. | ||
| View original record | -2- Hs/Rn.10/KL.24.6.32. As a matter of interest, we repeated a test trying small v large valves on the Phantom, and we got the same sort of results, Curve Rn.24 attached. Quite a small difference in… | ||
| scan0133 | Summary of findings on engine performance relating to exhaust systems, camshafts, and valve areas. | ||
| View original record | -3- We find that the 'resonance' type of exhaust system with less back pressure reduces the 'roar' due to early opening inlet valves, so that slow running now more or less dictates this feature.… | ||
| scan0134 | Comparative table of specifications for various engine models. | ||
| View original record | { Header: , P.II.: Bore Ins. 4.25, China.: Bore Ins. 3.25, J.1.: Bore Ins. 3.25, J.3.: Bore Ins. 3.4, Peregrine.: Bore Ins. 2.725, R. engine.: Bore Ins. 6.00, F. engine.: Bore Ins. 5.00, F. high… | ||
| scan0135 | Graph showing the effect of increased valve lift on engine performance at a 4.78 compression ratio. | ||
| View original record | RM P22 EFFECT OF INCREASED VALVE LIFT ON 4.78 C/R STD. CYLINDER HEAD 1.9" DIA. VALVE THROAT 114° CAMSHAFT TO E.82448 OPEN EXHAUST VALVE LIFT .525 VALVE LIFT .470 CLAUDEL TWIN CARBS 1.4" CHOKES EX IN… | ||
| scan0136 | Performance graph comparing engine output based on different valve sizes, camshaft timings, and carburettor setups. | ||
| View original record | RM. P.24 COMPARISON OF VALVE SIZES W.W. 1 1/4" CAMSHAFT 4.78 C.R P II UNIT OPEN EXHAUST --- VALVES 2" THROAT. HEAD MACHINED TO GIVE A MINIMUM CLEARANCE OF .2" ..... ROUND VALVE — STD. 1.90 THROATS… | ||
| scan0137 | 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 1/4" CHOKES OPEN EXH: 4.78 C/R. STD ALUM HEAD 1.9 VALVE THROAT VALVE LIFT .430 VALVE LIFT .480 Valve Timing… | ||
| scan0138 | Power curve graph for the 7983 c.c. 8-litre Bentley engine, comparing Bentley and R.R. timing. | ||
| View original record | RM. P 56 7983 C.C. 8 LITRE BENTLEY POWER CURVE 5-1 COMP RATIO OPEN EXHAUST BENTLEY TIMING 108° SHAFT 10° 12° Ex IN INLET CLEE .019 EXHAUST .006/.019 45 50 INLET 235° EXHAUST 242° R.R. TIMING W.W. 114°… | ||
| scan0139 | Performance comparison chart of an 8 Litre Bentley and a 40/50 R.R.M. engine, showing valve timing and B.M.E.P. | ||
| View original record | RMP57 COMPARISION OF 8 LITRE BENTLEY AND 40/50 R.R.M. 5-1 C/R OPEN EXHAUST. M.E.P.'S DIAGRAM 1 (LEFT): BENTLEY INLET 019 EX .004 Angles: 10, 12, 50, 45 INLET 235 EXHAUST 242 DIAGRAM 2 (MIDDLE): 114°… | ||
| scan0140 | Performance graph and valve timing diagrams for an E57177 camshaft on a 20/25 HP engine. | ||
| View original record | UNIT C5 20/25 HP (CHINA) E 57177 (112°) CAMSHAFT RM 69 COMP. RATIO 5.7:1 E 57177 (112°) CAMSHAFT (TWO EXHAUST CAMS) STANDARD INDN SYSTEM OPEN EXHAUST (A) EARLY TIMING (TAPPET CLR .006) (B) LATE TIMING… | ||
| scan0141 | Tabulated list comparing valve opening specifications for various engines. | ||
| View original record | X5095 x 7770 x 5770 x 7090 x 5095 x 3991 x 400. TABULATED LIST OF VALVE OPENINGS. Engine. | Dia. of inlet valve | Lift of inlet valve. | Ratio Lift valve dia. | Valve area per litre dis.… | ||
| scan0142 | The design and performance of reduced toe camshafts for the J.III & China engines, including ideal timing diagrams. | ||
| View original record | X5090 E. from Hs/Rm. c. to By. Hs/Rm.5/KT.10.10.32. REDUCED TOE CAMSHAFTS J.III & CHINA. We have now established the fact that, even with a turbulent head, we cannot use much more than 105 M.E.P. open… | ||
| scan0143 | Improving engine power output and speed by modifying camshaft timings and design for the J.1 and Phantom II models. | ||
| View original record | -2- Hs/Rm.5/KT.10.10.32. On J.1, however, we have a definite opportunity of getting a better top power output with a reduced toe cam having a longer duration. We attach a curve shewing how we pick up… | ||
| scan0144 | Performance graph and timing diagrams for the E57177 (112°) camshaft. | ||
| View original record | UNIT C5 20/25 HP (CHINA) E 57177 (112°) CAMSHAFT RM 69 COMP. RATIO 5.7:1 E 57177 (112°) CAMSHAFT (TWO EXHAUST CAMS) STANDARD INDN SYSTEM OPEN EXHAUST Ⓐ EARLY TIMING (TAPPET CLR .006) Ⓑ LATE TIMING… | ||
| scan0145 | Graph comparing Brake Mean Effective Pressure (B.M.E.P.) against engine speed (R.P.M.) for two different tappet clearance settings. | ||
| View original record | J III R M J 7 VARIATION IN TAPPET CLEARANCE ON THE 112.0° CAMSHAFT 2 EXHAUST CAMS 5.5 C/R 1.050 CHOKES OPEN EXHAUST NO AIR INTAKES. CARBS TO LEC 2924 ① TAPPET CLCE .006 ② TAPPET CLCE .013 B.M.E.P.… | ||
| scan0146 | Performance graph comparing a 110.5° camshaft and a 120° camshaft with different tappet clearances. | ||
| View original record | J III COMPARISON OF 110.5° CAMSHAFT & 120° CAMSHAFT MADE WITH TWO EXHAUST CAMS 5.5 C/R 1.050 CHOKES OPEN EXHAUST NO AIR INTAKES CARBS TO LEC. 2924 CURVE ① TAPPET CLCE .006 CURVE ② TAPPET CLCE .013 RM… | ||
| scan0147 | Outlining the handover schedule and development status for the Large Bore J.3 engine unit and its associated components. | ||
| View original record | * 5090 Mths. From Hs/Rn. c. to RHC/HPS. Hs/Rn.5/MA.13.12.32. LARGE BORE J.3 UNIT. The large bore J.3 unit will be handed over to us shortly with the new camshaft, but with the old type cylinder head.… | ||
| scan0148 | Optimal timing for a new camshaft, part number E.82448 1140, including a timing diagram. | ||
| View original record | X5090 By. From Hs/Rn. c. to E. c. to Mx. Hs/Rn.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… | ||
| scan0149 | The design of the petrol pump and operating mechanism for the J.1. engine. | ||
| View original record | 85090 To BY. from E/JNR. E/JNR.1/HP.24.12.32. c. Wor. Hs. re J.1. Engine. Please receive herewith: LeC.3300 - Design of the petrol pump and operating mechanism from the camshaft. It will be noticed… | ||
| scan0150 | Estimate for a camshaft balancing scheme for the 20/25-HP model. | ||
| View original record | WOR. Hs. ARM. G/Rb. rr090 LID Sft.2/DH.18.11.33. CAMSHAFT BALANCING SCHEME - 20/25-HP. Ref. Wor5/R.16.11.33. We are preparing an estimate of this scheme for Standardisation purposes and we will… | ||
| scan0151 | Issues with valve gear noise and potential solutions involving tappet adjustment and camshaft design. | ||
| View original record | x5090 To Sg. From Hs/Rm. C. Wor. E. C. Dy. FH. C. H. Hs/Rm.2/KT.11.12.33. 8207 VALVE GEAR NOISE. In view of the general concern regarding the silence of R.R. valve mechanism, we have carried out tests… | ||
| scan0152 | Investigation into the source of Bentley tappet noise and the ineffectiveness of insulating the rocker cover to reduce it. | ||
| View original record | To Sg. From Hs/FJH. c. Hsr. E. c. By. Rn. c. Bv. Hs/FJH.11/KT.11.12.33. BENTLEY TAPPET NOISE. The first part of this investigation consisted of attempts to reduce the tappet noise on the Bentley (Unit… | ||
| scan0153 | Analysis of valve and cam noise, comparing materials and measuring cam contours to determine quiet operating velocities. | ||
| View original record | -2- Hs/PJH.11/RT.11.12.35. The noise due to the impact of the valve on its seat should be proportional to the velocity of impact, the mass of the valve, cap, and cotters, and the rigidity of the seat… | ||
| scan0154 | Technical analysis of cam contours, clearances, and their effects on tappet noise and valve velocity. | ||
| View original record | -3- Ha/EJH.11/KT.11.12.33. If the cams conformed perfectly to 1eG.3292 these velocities would correspond to clearances of 0.004" and 0.0075" respectively. Assuming a limit of accuracy of .002" for the… | ||
| scan0155 | Data table specifying maximum clearances and velocities for quiet cam operation. | ||
| View original record | SHEET 1. | CAM. | | MAX. CLEARANCE FOR QUIET CLOSING INCHES. | CLOSING VELOCITY INS/DEGREE. | MAX. CLEARANCE FOR QUIET OPENING INCHES. | OPENING VELOCITY INS/DEGREE. |… | ||
| scan0156 | Graph showing valve lift against crankshaft degrees for a Bentley cam toe. | ||
| View original record | BENTLEY CAM TOES. UNIT B.7. No.1 CYL. INLET CAM. CAMS MADE TO LIFT CURVE LEC 5292. DOTTED CURVE SHOWS TOES TO LEC 5292. VALVE LIFT CRANKSHAFT DEGREES. CLOSING TOE OPENING TOE MAX. CLEARANCE FOR QUIET… | ||
| scan0157 | Blueprint graph showing Bentley Cam Toes performance, plotting valve lift against crankshaft degrees for an exhaust cam. | ||
| View original record | BENTLEY CAM TOES. UNIT B7. No.1 CYL. EXHAUSTCAM. CAMS MADE TO LIFT CURVE LEC 3292. DOTTED CURVE SHOWS TOES TO LEC 3294. VALVE LIFT — INCHES. CRANKSHAFT DEGREES. CLOSING TOE OPENING TOE MAX. CLEARANCE… | ||
| scan0158 | Graph plotting valve lift against crankshaft degrees for a Bentley B7 Unit No. 2 Cylinder Inlet Cam. | ||
| View original record | BENTLEY CAM TOES UNIT B7. No 2 CYL. INLET CAM CAMS MADE TO LIFT CURVE LEC 3292 DOTTED CURVE SHOWS TOES TO LEC 3297 VALVE LIFT - INCHES. CRANKSHAFT DEGREES. CLOSING TOE OPENING TOE MAX CLEARANCE FOR… | ||
| scan0159 | Blueprint graph comparing the valve lift of two different Bentley exhaust cam toe designs against crankshaft degrees. | ||
| View original record | BENTLEY CAM TOES UNIT 87 No 2 CYL. EXHAUST CAM. CAMS MADE TO LIFT CURVE LEC 329. DOTTED CURVE SHOWS TOES TO LEC 3292. VALVE LIFT — INCHES. CRANKSHAFT DEGREES. CLOSING TOE OPENING TOE MAX CLEARANCE FOR… | ||
| scan0160 | Graph showing Bentley cam base circle contours for Unit B7. | ||
| View original record | BENTLEY CAM BASE CIRCLE CONTOURS. UNIT B7 CAMS MADE TO LIFT CURVE LEC 3292. No.1 CYL. INLET. No. 2 CYL. INLET. No.1 CYL. EXHAUST. No 2 CYL. EXHAUST. VALVE LIFT - INCHES. CRANKSHAFT ANGLE - DEGREES.… | ||
| scan0161 | Graph of Bentley cam toe profiles, comparing valve lift and velocity for standard and suggested designs. | ||
| View original record | BENTLEY CAM TOES. VALVE LIFT - INCHES 0.020 0.015 0.010 0.005 0 CRANKSHAFT DEGREES. 0 5 10 15 20 25 30 35 40 VALVE VELOCITY - INCHES PER CRANKSHAFT DEGREE. 0.01 0.0008 0.0006 0.0004 0.0002 0 SUGGESTED… | ||
| scan0162 | Standardisation of a balancing cam on the camshaft to cure timing gear rattles. | ||
| View original record | RR 788A (SH) (R2674, 16-10-33) BM. 3/262/6. X5090 Completed 19.12.33 20/25 STANDARDISATION of PARTS. Date 2.11.33 Description of Parts. BALANCING CAM ON CAMSHAFT. Origin. To cure timing gear rattles.… | ||
| scan0163 | Notification regarding the breakage of tappet springs on Bentley & 20/25 models. | ||
| View original record | RHC. +5090 Hs/Smth.14/KW.30.6.34. Balance Cams on Bentley & 20/25. We have been notified of the breakage of one of the tappet springs in connection with this mechanism on a customer's car. We should… | ||
| scan0164 | Modifications to Balancing Cam for lubrication, hardened camshaft end play washers, and improved crankcase webbing. | ||
| View original record | RR 788A (SH) (52674, 16-10-33) BM. 3/262/6. COMPLETED 11.7.34. 20/25 STANDARDISATION of PARTS. Date 20-6-34 Date 27.4.34. X No. 5090. Drawing No. Part List Description of Parts: Modifications to… | ||
| scan0165 | Estimated cost for extra jigs, tools, and equipment for the 'F.2' series. | ||
| View original record | Est. cpst of extra jigs, tools and equipment (Sft/Ws.5.6.34) £15.0.0. These parts are already instructed for "F.2" series. | ||
| scan0166 | Comparison graph of Brake Mean Effective Pressure (B.M.E.P.) curves for Cadillac and Rolls-Royce products. | ||
| View original record | G.M.C. CORRECTION TO 103° F BRAKE MEAN EFFECTIVE PRESSURE CURVES CADILLAC & ROLLS-ROYCE PRODUCTS AXIS LABELS: Left Y-Axis: B.M.E.P., LBS/SQ. IN., H.P., DEGREES Right Y-Axis: LB/FT., LB/H.P. HR. FUEL X… | ||
| scan0167 | Request to manufacture a 25 HP camshaft with specific timing for slow running experiments. | ||
| View original record | X507 To RHC. Hs/Smth.7/KW.13.5.35. 25 HP. Camshaft - Hs.1966. Will you please make us a camshaft similar to E.57177 but with 118° between the cams, which we shall call Hs.1966. We require this for… | ||