Rolls-Royce Archives
| Identifier | Entry | ||
| 05-page001 | Power curve graph comparing the performance of the R.R. Steam Cooling System against a Standard Water Cooling system. | ||
| View original record | POWER CURVE 11 GIII (10-2-26) R.R. STEAM COOLING SYSTEM AND STANDARD WATER COOLING. ROAD WHEEL B.H.P ENGINE R.P.M. WATER COOLING STEAM COOLING ENGINE TEMP: (WATER COOLING) AT 80°C N.B. ENGINE BECOMES… | ||
| 05-page002 | From 'R' requesting an estimate of expected power gains for a 20 HP engine following proposed modifications. | ||
| View original record | To E. To Hs. from R. 4577 R9/M2.11.26. 20 HP. X.5770 XJ5771 X.5230 Several times we have started out to get more power from this engine by :- (1)..... Improved exhaust. (2)..... Slightly higher… | ||
| 05-page003 | Requesting better M.E.P. (Mean Effective Pressure) and suitable valve springs for 20 HP and 40/50 engines. | ||
| View original record | To E. from R. To Hs. c. to BJ. Wor. By. X5771 RL/MS.11.26. 20 HP. AND 40/50 ENGINES. X. 8771 X. 634 X. 5771 X. 8010 X. 8060 Better M.E.P. needed for the above - maximum HP. just under master… | ||
| 05-page004 | Two acceleration graphs, one comparing a Rolls Royce Phantom to a Bentley, the other comparing high vs low axle ratios. | ||
| View original record | Top Graph: ACCELERATION ROLLS ROYCE v BENTLEY VELOCITY M.P.H. TIME SECONDS Legend: 6 1/2 LITRE BENTLEY 10 E.K. & TORY AXLE STANDARD PHANTOM Bottom Graph: ACCELERATION HIGH v LOW AXLE RATIO VELOCITY… | ||
| 05-page005 | Two graphs comparing the acceleration performance of various open touring car models and engine configurations. | ||
| View original record | Top Graph: ACCELERATION HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. TIME SECONDS OPEN TOURING CARS R.E.X. NY EMPTY 2.27 TONS (Comp Ratio 5.2/1) R.E.N.K. NY EMPTY 2.38 TONS (Comp Ratio 4.6/1)… | ||
| 05-page006 | Performance improvements of a 20 HP car after modifications to its compression ratio, exhaust, and carburation. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to DA. BY. K5721 Hs/Rm2/LGS.12.26. 20 HP. PERFORMANCE. X3405 (crossed out) X1725 We have been conducting a number of tests on the 20 HP. to ascertain… | ||
| 05-page007 | Performance graphs showing acceleration and velocity for a 20 HP car under various configurations. | ||
| View original record | 20 H.P. PERFORMANCE ACCELERATION Y-AXIS: ACCELERATION FT/SEC/SEC X-AXIS: ROAD SPEED M.P.H. LEGEND (ACCELERATION GRAPH): 1. HIGH COMP 20 H.P. 2. HIGH COMP 20 H.P. CUT OUT OPEN 3. STANDARD 20 H.P. 4. 20… | ||
| 05-page008 | Performance test results of a Lorraine-Dietrich engine on a test bench. | ||
| View original record | To R. From Hs/ACL. c. to BJ. Wor. c. to HU. B. c. to DA. BY. X5771 Hs/ACL1/LG30.3.27. PERFORMANCE OF LORRAINE-DIETRICH ENGINE ON THE TEST BENCH. X3588 X790 X5771 We have made a number of tests on the… | ||
| 05-page009 | The characteristics and performance of a six-cylinder engine, comparing it to the Coshawk, 20 HP, and Hispano models. | ||
| View original record | contd :- -2- The engine - a six cylinder - has a bore X stroke of 2.95" X 5.125" the swept volume being 3.444 litres or 10% greater than the Coshawk. The compression ratio is rather high being 5.9 /1… | ||
| 05-page010 | Zenith triple diffuser carburettors and their performance, including a diagram of the induction system. | ||
| View original record | contd :- -3- but there is little reliable information available on the subject. Two horizontal Zenith triple diffuser carburetters each supplying three cylinders are used. The induction passages are… | ||
| 05-page011 | Description of the 'offset' or 'desaxe' cylinder arrangement and the valve gear design. | ||
| View original record | contd :- -4- This should result in good filling of the cylinders. OFFSET CYLINDERS. A rather unusual feature in the design of this engine is the 'off set' or 'desaxe' arrangement of the cylinders with… | ||
| 05-page012 | Comparison of valve lift diagrams and gas velocity performance between the Lorraine and Goshawk engines. | ||
| View original record | contd :- -5- The lift diagrams are given on prints Nos.1 and 2 compared with the 20 HP., also another curve is inserted which shews the difference if the 20 HP. lift was as great as the Lorraine.… | ||
| 05-page013 | Comparison of mechanical efficiency and ignition systems between Lorraine, Goshawk, Hispano, and Phantom engines. | ||
| View original record | contd :- -6- mechanical efficiency curves. The overall mechanical efficiency of the Lorraine is higher than the Goshawk but actually there is little difference in the power absorbed in rotating the… | ||
| 05-page014 | Engine performance, detonation, and cylinder head design, including a sketch of an inlet valve. | ||
| View original record | contd :- -7- flame travel from the points of propogation. We are not in possession of the corresponding ignition curves for the 20 HP. but are arranging to obtain these. The engine seems particularly… | ||
| 05-page015 | Computed power curves for a 20 HP engine, comparing performance factors with a Lorraine engine and detailing valve and crankshaft observations. | ||
| View original record | contd :- -8- POWER CURVES FOR 20 HP. RR. COMPUTED FOR SAME COMPRESSION RATIO AND INDUCT- ION PIPE DEPRESSION AS LORRAINE. On blue print No.9. we have shewn curves calculated for the 20 HP. shewing the… | ||
| 05-page016 | Summary of engine performance, vibration characteristics, and a comparison with a 20 HP model. | ||
| View original record | contd :- -9- crankshaft in place of the fan pulley and proved effective in damping out this vibration to the extent that it was not evident by 'feel' or sound when on the test bed. This half speed… | ||
| 05-page017 | Crankshaft 'master period' and experiments on a 20 HP engine. | ||
| View original record | 'contd :- -10- (7) The 'master period' of the crankshaft occurs at a high speed = 3900 r.p.m. - which is well outside the working speed range. It seems probable that such factors as compression ratio,… | ||
| 05-page018 | Diagram comparing the exhaust valve lift of a Lorraine-Dietrich engine with a 20 HP engine. | ||
| View original record | LORRAINE-DIETRICH ENGINE EXHAUST VALVE LIFT DIAGRAM VALVE LIFT (INCHES). LORRAINE 20 H.P. R.R. THE LIGHTER DOTTED CURVE REPRESENTS THE PHANTOM THE 20 H.P. R.R. VALVE. FIGURES OF THE LIFT ARE AS HIGH… | ||
| 05-page019 | Diagram comparing the inlet valve lift of a Lorraine-Dietrich engine against a 20 HP R.R. engine. | ||
| View original record | LORRAINE-DIETRICH ENGINE INLET VALVE LIFT DIAGRAM VALUE LIFT (INCHES) LORRAINE 20 H.P. R.R. THE LIGHTLY DOTTED CURVE REPRESENTS THE PROPOSED 20 H.P. R.R. WITH ACTION OF THE LIFT WHICH IS AS HIGH AS… | ||
| 05-page020 | Graph of mechanical efficiency and compression pressure curves for a Lorraine-Dietrich engine, with a comparison to a 20 HP R.R. engine. | ||
| View original record | LORRAINE-DIETRICH ENGINE. MECHANICAL EFFICIENCY & COMPRESSION PRESSURE CURVES. (RATIO = 5.9 : 1) COMPRESSION PRESSURE. (LBS / SQ") PERCENTAGE MECHANICAL EFFICIENCY R.P.M. OF ENGINE. COMP. PRESSURES… | ||
| 05-page021 | Graph comparing the power per unit cubic capacity and petrol consumption of a Lorraine-Dietrich engine against a 20 HP R.R. engine. | ||
| View original record | ④ LORRAINE-DIETRICH & 20 HP R.R. COMPARISON OF POWER PER UNIT CUBIC CAPACITY & PETROL CONSUMPTION COMPRESSION RATIOS:- LORRAINE = 5.8 to 1 20 HP R.R. = 4.75 to 1. BRAKE HORSE POWER PER LITRE. R.P.M OF… | ||
| 05-page022 | Power curve graph for a Lorraine-Dietrich engine, plotting Brake Horse Power and Brake Mean Effective Pressure against engine RPM. | ||
| View original record | LORRAINE-DIETRICH POWER CURVE BORE = 75 M/M, STROKE = 130 M/M CUBIC CAPACITY = 3444 C.C. COMPRESSION RATIO = 5.9 TO 1 STANDARD BENT EXHAUST SYSTEM CONNECTED TO H.T.P. B.H.P B.M.E.P 20 H.P. R.R. B.H.P… | ||
| 05-page023 | Graph comparing depression in the induction pipe versus engine RPM for a Lorraine-Dietrich engine and a 20HP R.R. engine. | ||
| View original record | LORRAINE-DIETRICH ENGINE DEPRESSION IN INDUCTION PIPE. 21-3-27 DEPRESSION IN INDUC' PIPE (INCHES OF MERCURY). R.P.M. OF ENGINE 20 HP R.R. LORRAINE ⑥ | ||
| 05-page024 | Graph plotting necessary ignition advance against engine RPM for Lorraine and Lister Phantom engines. | ||
| View original record | ⑦ 17-3-27 Lister Phantom with Co. MODD TO L.E.G. 8889. One Ign. Two Igns. DEGREES ADVANCE BEFORE 'DC 50° 40° 30° 20° 10° LORRAINE. One Ign. Two Igns. LORRAINE-DIETRICH ENGINE. NECESSARY IGNITION… | ||
| 05-page025 | Performance curves for a Lorraine-Dietrich engine, showing gas velocity past valves. | ||
| View original record | ⑧ INDICATED MEAN EFFECTIVE PRESSURE (LBS PER SQ") R.P.M. OF ENGINE GAS VELOCITY. (FEET PER SEC) 25-3-27 Gas Vel. / I.M.E.P. Gas Vel. / R.P.M. Gas Vel. / R.P.M. Gas Vel. / I.M.E.P. 20 H.P. R.R. (INLET… | ||
| 05-page026 | Comparison graph of Indicated Horse Power and Indicated Mean Effective Pressure curves for a Lorraine-Dietrich and a 20 HP engine. | ||
| View original record | LORRAINE - DIETRICH & 20 H.P. R.R. COMPARISON. INDICATED HORSE POWER & INDICATED MEAN EFFECTIVE PRESSURE CURVES. Left Y-Axis: INDICATED HORSE POWER. Right Y-Axis: INDICATED MEAN EFFECTIVE PRESSURE… | ||
| 05-page027 | Graph showing the inlet valve lift and piston displacement curve for a Lorraine-Dietrich engine. | ||
| View original record | 10 LORRAINE-DIETRICH ENGINE. INLET VALVE LIFT & PISTON DISPLACEMENT CURVE. CYLINDERS OFFSET 10 m/m (.394"). STROKE = 130 m/m (5.12"). (No Tappet Clearance). VALVE LIFT m/m POSITION OF CRANKSHAFT… | ||
| 05-page028 | Graph showing the inlet valve lift and piston displacement curve for a 20 HP engine. | ||
| View original record | (11) 20 H.P. ROLLS-ROYCE ENGINE: INLET VALVE LIFT & PISTON DISPLACEMENT CURVE. STROKE = 4.50" (NO TAPPET CLEARANCE) VALVE LIFT (INCHES) .30 .20 .10 POSITION OF CRANKSHAFT (DEGREES) 320° 340° T.D.C.… | ||
| 05-page029 | Graph of horse power vs RPM required to rotate a Lorraine-Dietrich engine. | ||
| View original record | 412 LORRAINE - DIETRICH ENGINE POWER NECESSARY TO ROTATE ENGINE HORSE POWER 25, 20, 15, 10, 5, 0 R.P.M. OF ENGINE 500, 1000, 1500, 2000, 2500, 3000 LORRAINE 20HP R.R. REQUIRED POWER FOR LORRAINE… | ||
| 05-page030 | Valve springs rating chart for the Lorraine-Dietrich engine. | ||
| View original record | [ "13", "LORRAINE-DIETRICH ENGINE.", "VALVE SPRINGS RATING CHART.", "LOAD (LBS.)", "50", "40", "30", "20", "10", "RESULTANT.", "OUTER SPRING.", "INTERMEDIATE SPRING.", "INNER SPRING.", "VALVE LIFT… | ||
| 05-page031 | Power curve graph comparing the India IV engine with a 5.1/1 compression ratio to a standard 20 HP production engine. | ||
| View original record | POWER CURVE FOR INDIA IV ENGINE WITH 5.1/1 COMPn RATIO. STD 20 H.P. PRODUCTION ENGINE SHEWN FOR COMPARISON CURVES CORRECTED TO N.T.P H.P. INDIA IV 5.1/1 C.R. STD PRODn 20 HP ENGINE. CEO/L / 28/9/29 | ||
| 05-page032 | Comparison of engine specifications between the Lorraine-Dietrich and the 20HP R.R. models. | ||
| View original record | GENERAL DESCRIPTION OF THE LORRAINE-DIETRICH ENGINE. (WITH STANDARD 20HP R.R. FIGURES FOR COMPARISON) | | LORRAINE-DIETRICH | 20 H.P. R.R. | |---|---|---| | BORE. | 75 m/m (2.95 ins) | 3.00 ins. | |… | ||
| 05-page033 | Analysis of Lorraine Dietrich engine tests for 20 HP power development experiments. | ||
| View original record | To R. From Hs/ACL. c.c. to BJ. Wor. c.c. to RS. R. c.c. to DA. HY. Y5771 Hs/ACL1/LG1.4.27. 20 HP. R.R. POWER DEVELOPMENT EXPERIMENTS. X3588 X790 When at analysing the results of tests made on the… | ||
| 05-page034 | Comparative test report on engine modifications including larger diameter valves, different carburettors, and higher compression ratios. | ||
| View original record | contd :- -2- ation in this direction. We considered that the larger diameter valves, in order to make a true comparison with those of the std. dimensions, should be tested in conjunction with carbs.… | ||
| 05-page035 | Engine power output improvements using different carburetter configurations and induction pipe depressions. | ||
| View original record | contd :- -3- INCREASED POWER WITH LOWER INDUCTION PIPE DEPRESSION. Referring to the first set of results taken which are given on Print No.1. we have the power output with the std. cyl. head for the… | ||
| 05-page036 | Engine power increases through the use of larger valves and different carburetter configurations. | ||
| View original record | contd :- -4- We have observed that the power increase is just what would be expected from the reduction in depression. The maximum power - at 2750 r.p.m. - has been increased from 58 to 63 B.HP. or… | ||
| 05-page037 | Report comparing engine power output, compression ratios, detonation, and ignition systems between different engines. | ||
| View original record | 'contd :- -5- On Print No.4. is shewn the power output as obtained above with the two carburetters, large valves and the 5.45/1 comp: ratio compared with a standard Goshawk of 4.75 to 1 comp: ratio.… | ||
| 05-page038 | Summary and conclusions of tests to increase the power of an existing 20 HP engine, with reference to the Lorraine. | ||
| View original record | contd :- -6- SUMMARY AND CONCLUSIONS. The tests have proved particularly encouraging in shewing us that we can increase the power of the existing 20 HP. to the extent estimated from the Lorraine by :-… | ||
| 05-page039 | The proposed testing of a 6/1 compression ratio on a 20 HP engine. | ||
| View original record | contd :- -7- We also intend testing a 6/1 compression ratio in order to determine if the specific output of the 20 HP. HR. can be equal to that of the Lorraine. The results and information obtained… | ||
| 05-page040 | Graph showing power increase on a 20HP engine due to lower depression in the induction pipe. | ||
| View original record | 20HP POWER INCREASE DUE TO LOWER DEPRESSION IN INDUCTION PIPE ENGINE No 11-GII COMPRESSION RATIO 5.42 to 1 OPEN EXHAUST CURVES CORRECTED TO N.T.P. BHP STD. 20HP CARB. ZENITH TRIPLE VENTURI HORIZONTAL… | ||
| 05-page041 | Performance graph comparing Brake Horse Power and Brake Mean Effective Pressure following the installation of larger valves on a 20 HP engine. | ||
| View original record | 20 HP POWER INCREASE DUE TO LARGER VALVES. ENGINE No 11-G.II. COMPRESSION RATIO = 5.45 TO 1 OPEN EXHAUST. Two ZENITH 1-1/16 VENTURI HORIZONTAL CARBURETTORS. CORRECTED TO N.T.P. 31-3-'27 B.H.P. LARGER… | ||
| 05-page042 | Graph showing the 20 HP power increase due to larger valves and lower induction pipe depression. | ||
| View original record | 20 H.P. POWER INCREASE DUE TO LARGER VALVES AND LOWER DEPRESSION IN THE INDUCTION PIPE. ENGINE No. 11-GXI COMPRESSION RATIO - 5.45 to 1. OPEN EXHAUST Corrected to N.T.P. 31-3-27 B.H.P. B.M.E.P. LARGE… | ||
| 05-page043 | Graph showing the 20HP engine power increase due to modifications including higher compression, larger valves, and lower induction pipe depression. | ||
| View original record | 20HP POWER INCREASE DUE TO HIGHER COMPRESSION RATIO, LARGER VALVES AND LOWER DEPRESSION IN THE INDUCTION PIPE. ENGINE NO. 11-G-II OPEN EXHAUST CONVERTED F.I.P. B.H.P. B.M.E.P. 20 HP ENGINE WITH LARGE… | ||
| 05-page044 | Blueprint showing the arrangement of two Zenith carburetters on the 20 HP engine. | ||
| View original record | [ "6", "SPLAYED EXH. PIPES.", "HORIZONTAL ZENITH TRIPLE DIFFUSER CARB.", "ARRANGEMENT OF THE TWO ZENITH CARBURETTERS ON THE 20 H.P.", "EXH. PORTS", "INLET MANIFOLDS", "FITTINGS FOR THE TWO ZENITH… | ||
| 05-page045 | Graph plotting gas velocity past standard and large valves against engine RPM for a 20 HP engine. | ||
| View original record | 5 20 H.P. GAS VELOCITY PAST VALVES. INLET AREA PAST VALVES:- STANDARD VALVES = 1.04 sq. ins. LARGE VALVES (2400 rpm) = 1.40 sq. ins. Standard Valves. Large Valves. GAS VELOCITY (FEET PER SEC) R.P.M.… | ||
| 05-page046 | Different valve timing for the Sports Phantom to improve high-speed output, based on a Lorraine engine comparison report. | ||
| View original record | To Re. from E. c. to BJ. HY. X5771 E1/M23.4.27. SPORTS PHANTOM. X.3588 X.5770 X.8060 X.5771 Referring to the report giving comparison of Lorraine output with output of 20 HP. engines under different… | ||
| 05-page047 | Acceleration figures for the 20 HP car. | ||
| View original record | To D/L. from Hs/Rn. X5776 Hs/Rsd/L.13.5.27. 20 HP. ACCELERATION. X1725 With reference to the attached. Herewith the acceleration curve for 20 HP. RR. car. A good average figure from 10 to 50 m.p.h. on… | ||
| 05-page048 | Standard top gear acceleration curve for a 1924 20 HP Touring Car. | ||
| View original record | Velocity M.P.H. TOP GEAR ACCELERATION CURVE STANDARD. (1924 20 HP. Touring Car.) Time secs. | ||
| 05-page049 | Power development for the 20 HP engine, focusing on camshaft experiments. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. SY. c. to OY. X5771 Hs/ACL1/LG23.5.27. 20 HP. RR. POWER DEVELOPMENT : CAMSHAFT EXPERIMENTS. X5090 In a previous report was shewn how the power… | ||
| 05-page050 | Report page detailing engine performance comparisons using different camshafts and Zenith carburettors. | ||
| 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… | ||
| 05-page051 | Experiment report on how high induction pipe depression reduces the performance advantage gained from 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… | ||
| 05-page052 | Engine performance experiments with a long duration camshaft. | ||
| 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… | ||
| 05-page053 | Continued notes on engine performance modifications, test conclusions, and plans for further development on a 20 HP engine and the Phantom. | ||
| 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… | ||
| 05-page054 | Performance graph for a 20HP engine showing power increase due to valve lift, compression, larger valves, and lower induction pipe depression. | ||
| View original record | .20.HP POWER INCREASE DUE TO LONG DURATION OF VALVE LIFT. HIGHER COMPRESSION RATIO, LARGER VALVES, AND LOWER INDUCTION PIPE DEPRESSION. ENGINE No H-GE COMPRESSION RATIO - 5.3 TO 1 LARGE VALVES (1.40"… | ||
| 05-page055 | Graph showing power increase on a 20HP engine due to a special long duration camshaft compared to a standard camshaft. | ||
| View original record | 20HP POWER INCREASE DUE TO LONG DURATION OF VALVE LIFT. ENGINE No 11-GII COMPRESSION RATIO = DIAG No 1 LARGER VALVES. (-NOT ON) TWO ZENITH TRIPLE DIFFUSER TYPE CARBURETTORS. SPECIAL LONG DURATION… | ||
| 05-page056 | Graph showing a 20 HP engine power increase due to long duration valve lift when using the standard carburettor. | ||
| View original record | 20 HP POWER INCREASE DUE TO LONG DURATION OF VALVE LIFT, WHEN USING THE STANDARD CARBURETTOR ENGINE N° 11-GTE COMPRESSION RATIO - 5.15 TO 1. CADUCE VALVES (1-410 DIA) SPECIAL LONG DURATION CAMSHAFT… | ||
| 05-page057 | Valve lift diagram comparing a long duration camshaft to a standard camshaft. | ||
| View original record | LONG DURATION INLET VALVE LIFT DIAGRAM. The DOTTED CURVE REFERS TO STANDARD CAMSHAFTS. CRANKSHAFT MOVEMENT. 30°, 60°, 90°, 120°, 150°, 180°, 210°. FD/11.7.27 | ||
| 05-page058 | Timing diagram for a 20 HP long duration camshaft, with a comparison to the standard timing. | ||
| View original record | LONG DURATION CAMSHAFT (20 h.p.) TIMING DIAGRAM (.010 TAPPET CLEARANCE) T.D.C. I.O. (Inlet Opens) E.C. (Exhaust Closes) 6° 8° 66° 64° I.C. (Inlet Closes) E.O. (Exhaust Opens) B.D.C. (Bottom Dead… | ||
| 05-page059 | 20 HP power development using stronger valve springs and a long duration camshaft to prevent valve bounce. | ||
| View original record | To R. from HS/ACL. c. to BJ. Wor. c. to RH. E. c. to SY. Da. (5771) Hs/ACL1/LG26.5.22 20 HP. POWER DEVELOPMENT - STRONGER VALVE SPRINGS WITH LONG DURATION CAMSHAFT. 5094 We have now made a test with… | ||
| 05-page060 | Trialing Stromberg carburettors to gather information on low depression, acceleration, and low speed performance. | ||
| 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… | ||
| 05-page061 | Graph showing the power output of a 20HP engine with specific modifications. | ||
| View original record | 20HP POWER OUTPUT WITH THE FOLLOWING MODIFICATION TO STD ENGINE. TWO ZENITH TRIPLE DIFFUSER CARBURETTERS COMPRESSION RATIO 5.45 TO 1 LARGER VALVES 1.400" DIA INLET CAM DURATION INCREASED BY 22° ON… | ||
| 05-page062 | Letter from 'R' about a planned meeting and two potential strategies for improving car performance and engine design. | ||
| View original record | BJ. from R. c. to Hs. 45771 R7/MS.at.27. CARS IN GENERAL. X.8770 X.8410 X.8770 X.8771 X.5771 I am coming to London on Thursday the 8th.inst., but shall be employed at Mr. Claremont's office on Royce… | ||
| 05-page063 | Modifications made to a 20 HP engine to increase its power output. | ||
| View original record | To R. From hs/ACL. c. to BJ. WOr. c. to RG. E. c. to DA. EY. c. to OY. V5771 hs/ACL2/LG21.9.27. INCREASED POWER OUTPUT OF 20 HP. V5230 We have previously reported the increased performance obtainable… | ||
| 05-page064 | Comparison of an experimental engine against a standard 20 HP production engine, detailing power, fuel consumption, and compression ratio effects. | ||
| View original record | contd :- -2- Appended are curves shewing a comparison between this experimental engine and the std. production 20 HP. It is noticeable that the peak of the power curve has been raised to apxp approx.… | ||
| 05-page065 | Arrangement of exhaust and induction manifolds and timing diagram for long duration cams for an EXP Goshawk engine. | ||
| View original record | ARRANGEMENT OF EXHAUST & INDUCTION MANIFOLD IN EXP. GOSHAWK ENGINE CARBURETTER PLACED UNDER EXH PIPE FOR CONVENIENCE WHEN FITTED TO CAR. THIS ARRANGEMENT IS USED SO AS TO PREVENT THE BRANCH PIPES OF… | ||
| 05-page066 | Strategy for increasing the power of the 20 HP car. | ||
| View original record | To Wor. from Hs. c. to BY. Hs3/LG30.1.29. INCREASE IN POWER ON 20 HP. CAR. We consider it would be unwise to hold out any hope of increase in power on the 20 HP. until we come to the new engine with… | ||
| 05-page067 | Comparative performance of the 20 HP model and the development of a new turbulent head engine. | ||
| View original record | To Sg. from Hs. c. to Nor. c. to BY. X5771 Hs4/LG13.2.29. PERFORMANCE OF 20 HP. X5770 Recently you asked BY. for comparative H.P. and performance for different models of the 20 HP. compared with the… | ||
| 05-page068 | Advising against requesting more power for the 20 HP engine, as a more powerful option already exists. | ||
| View original record | contd :- -2- 20 HP., there will be certain customers who will always ask for a greater performance. We should not advise, at the moment, putting up a case to R. for more power for the 20 HP. because… | ||
| 05-page069 | Design and feature suggestions for a close-coupled four-seater all-weather car model. | ||
| View original record | DA/EV. Hs. from R. c. to SS. Wor. C. CX. X5770 RL/M23. 2. 29. G.4. CLOSE COUPLED FOUR-SEATER ALLWEATHER FOR R'S USE. X.5800 X.5770 X.5830 It is possible that this should be one of our Sales standards… | ||
| 05-page070 | Continued memo page comparing a Mercedes Benz car to the company's 18-EX model. | ||
| View original record | contd :- -2- look dirty. Yesterday we saw a particularly smart looking Mercedes Benz with closed sporting body, smaller and lower than our 18-EX smarter coloured, but not such a motor carriage. R. | ||
| 05-page071 | Requesting updates on a 20-HP car for a 10,000-mile test and another with a Turbulent head for a sales trial. | ||
| View original record | SECRET 45770 Hs/Rm. from Mr. Wor5/T.14.8.29. One of the minutes passed on Friday last was that the 20-HP car with Central Lubrication would be ready to start its 10,000 Miles test this week, and it… | ||
| 05-page072 | List of alterations made to a standard car, model 17-G.1V. | ||
| View original record | To Wor. from Hs/Rn. Y5770 Hs/RmL/LG25.3.29. 17-G.1V. This car is standard in all respects with the exception of the following alterations :- (1) Centre point lubrication with dashboard pump of… | ||
| 05-page073 | Modifications and test results for a 20 HP car, chassis 14-G4. | ||
| View original record | To R. from Hs. c.c. to SS. Wor. c.c. to K. DA. c.c. to BY. 20 HP. CAR. We have now got the 20 HP. car 14-G4 (the latest type) completed. We have removed the cross and fitted tubular cross members… | ||
| 05-page074 | Testing and modifying the India IV engine's compression ratio to resolve pre-ignition issues. | ||
| View original record | Ha/ACL1/LG28.3.29. INDIA IV - ENGINE COMPRESSION RATIO AND PRE-IGNITION. The original India IV. cyl. head gave a compression ratio of 3.6/1 and with this we experienced considerable trouble both on… | ||
| 05-page075 | Preignition issues, comparing water cooling effectiveness in aluminium and standard cast iron cylinder heads. | ||
| View original record | contd :- -2- The standard water pump admitting water to the cyl. blocks was retained. It was thought that if the trouble was due to hot spots at some part of the head, or inadequate cooling of the… | ||
| 05-page076 | Experiments to resolve preignition issues at high compression ratios by monitoring cylinder head temperatures. | ||
| View original record | contd :- -3- At the moment we can say that we cannot operate with a compression ratio of 8.6/1 due to preignition troubles. We are combining experiments and are arranging thermo couples attached to… | ||
| 05-page077 | Comparison of performance data for two vehicles during three separate hill climb tests. | ||
| View original record | Weight of both cars : 33 cwts. 3 qrs. 13" wheels. 11/50 axle. on each car. STANTON HILL. 12-C-LV. 14-C-LV. Start 10 m.p.h. 10 m.p.h. Finish 19 m.p.h. 22 m.p.h. Time 32 secs. 31 secs. TICKNALL HILL.… | ||
| 05-page078 | Blueprint comparing sketches of a standard 20 HP Cast Iron cylinder head and an India IV head. | ||
| View original record | [ "LARGER WATER SPACES ROUND PLUG THAN INDIA IV HEAD", "SKETCH OF SECTION MADE THRO' STD. 20 HP C.I. HEAD", "INDIA IV HEAD", "SECTION THRO' PLUG HOLE.", "SCREWED FOR PLUG INSERT", "ONLY SMALL WATER… | ||
| 05-page079 | The performance and characteristics of a Buick Light Six car. | ||
| View original record | To E. From Hs/Rs. c. to SJ. Wor. c. to DI. E. c. to CY. CWB. X5771 Hs/RsA/LG19.3.28. BUICK LIGHT SIX. X3317 CWB. has obtained one of these cars for us for a week, through the courtesy of General… | ||
| 05-page080 | Rubber engine mountings and a road performance comparison of a Buick and a 20 HP Sunbeam. | ||
| View original record | contd :- -2- RUBBER ENGINE MOUNTING. Part of the engine smoothness may be attributed to the rubber engine mounting, a sketch of which we attach. This is of the simplest form, the rear engine feet… | ||
| 05-page081 | Comparison of specifications between a 20 HP Rolls Royce and a Buick sedan. | ||
| View original record | DESCRIPTION OF DETAIL. 20 HP. RR. BUICK. Bore and stroke. 3 X 4 1/2 3 1/8 X 4 1/2 Displacement. 3132 3400 Average max. B.HP. 54 63 Compression ratio. 4.6 4.7 - 4.8 Car weight, closed sedan. 33 cwts.… | ||
| 05-page082 | Data sheet listing the technical specifications and observations for a Buick Car, Type 28-27C. | ||
| View original record | Hg/AJL/LG21.3.28. BUICK CAR. During the short time in which this car was at our disposal, we have taken the following particulars. Type 28-27C. Serial number 136280. Eng.No.2024730. Bore 3.125" Stroke… | ||
| 05-page083 | Specifications for inner and outer valve springs, and vehicle turning circles. | ||
| View original record | contd :- -2- Inner springs. Outside dia. .8750 Inside dia. .625". Dia. of wire .125". Free length 1.860". Length : valve closed = 1.675" Length : valve open = 1.365" Load : valve closed = 17 lbs. Load… | ||
| 05-page084 | Performance comparison of a Goshawk chassis against a Buick during various hill climb tests. | ||
| View original record | contd :- -3- The figures given for the Goshawk are average figures for a 31 cwts. chassis :- BUICK. M.P.H. GOSHAWK. M.P.H. Stanton Hill. start 10 finish. 23.5 10 19 Ticknall Hill. start. 10 finish. 46… | ||
| 05-page085 | Design drawing for a steel cradle and rubber bush for an engine bearer arm. | ||
| View original record | [ "RUBBER BUSH", "ENGINE BEARER ARM:", "CRADLE RIGIDLY ATTACHED TO THE FRAME", "STEEL CRADLE", "PROTECTED AREA OF RUBBER SUPPORTING FOOT 5.25 SQ.INS", ".700", "2.85"", ".400", ".450", "3.75"",… | ||
| 05-page086 | Road performance report on a Buick car, covering steering, springing, and performance. | ||
| View original record | X5771 Hs/AJL/LG22. 3.28. BUICK CAR. ROAD PERFORMANCE. X3317 STEERING. The steering is very low geared, 3 turns of the wheel are required to turn from one full lock to the other. It is also spongy and… | ||
| 05-page087 | Performance comparison report between a Goshawk and a Buick vehicle, including hill climb data and engine analysis. | ||
| View original record | contd : -2- The figures given for the Goshawk are average figures for a 31 cwts. chassis. BUICK. GOSHAWK. Staunton Hill. Start. 10 m.p.h. 10 m.p.h. Finish. 23.5 m.p.h. 19 m.p.h. Ticknall Hill. Start.… | ||
| 05-page088 | Vehicle test report detailing performance issues such as vibration, braking, and control layout. | ||
| View original record | contd :- -3- The engine mounting is 3-point with rubber rear mounting, the front mounting being similar to ours in effect. There is a bad vibration on top gear at 50 m.p.h. upwards, this is not… | ||
| 05-page089 | Line graph comparing top gear performance (speed vs. time) of a Buick Light Six versus a 20 HP model. | ||
| View original record | [ "BUICK LIGHT SIX V", "20 H.P. TOP GEAR", "Car Speed (M.P.H.)", "TIME (Secs.)", "BUICK", "FOHA 310 + RR", "A.L.L.", "M/8.20" ], | ||
| 05-page090 | Graph comparing the top gear acceleration of a 20 HP car against a 'Bush Light Six V'. | ||
| View original record | BUSH LIGHT SIX V 20 H.P. TOP GEAR CAR SPEED (M.P.H) TIME / SECS BUSH 20 H.P. RIGID + R.R. 19.3.23 A.J.L. | ||
| 05-page091 | 20 HP performance, discussing the need for improvements in light of chassis weight increases, body types, and brake upgrades. | ||
| View original record | To R. from Hs. c. to BJ. Wor. c. to RO. E. c. to DA. BY. X5771 Hs1/LG3.4.28. 20 HP. PERFORMANCE. X5770 X5830 In our opinion the increase in the 20 HP. performance is perhaps more urgent than EAC.10.… | ||
| 05-page092 | Increasing engine size for better performance, with a comparison to competitor models. | ||
| View original record | contd :- -2- petitors however have had the same advantage in reduction of body weights. The Bentley found it necessary to increase the size of their 3-litre car in order to give a reasonable… | ||
| 05-page093 | The comparative power and road performance of a 20 HP engine with an increased bore. | ||
| View original record | To R. from Hs/AJL. c. to Sg. Mor. c. to E. DA. c. to BY.x PN. X5771 Hs/AJL1/LG27.4.29. X4012 - X5771 ✓ Y1725 X488- 20 HP. COMPARATIVE POWER AND ROAD PERFORMANCE. First tests on 20 HP. engine with… | ||
| 05-page094 | Road test performance, including acceleration and hill climbs, comparing various 20 HP models against competitors. | ||
| View original record | contd :- -2- Road tests - acceleration. The acceleration figures obtained are what one expects after studying the road wheel power curves, and taking into account the comparative light weight of the… | ||
| 05-page095 | Continuation of a report comparing performance tests of 20 HP and 40/50 HP cars on Pistern Hill. | ||
| View original record | contd :- -3- The Chrysler speedometer readings given are apt to be misleading - the times only should be taken into consideration as the Chrysler speeds are non-corrected speedometer readings. We use… | ||
| 05-page096 | Comparison table of car specifications and performance data from hill climb tests. | ||
| View original record | CAR. | 12-G4. | 12-G4. | 14-G4. | 17-G4. | Chrysler. | 21-EX. Engine. | Std. 20 HP. | .2" on bore R = 5.25/1 14% larger car. | R = 5/1 Turbulent head. | Std. 20 HP. | '75' | S.S. Capacity C.C. | 3127… | ||
| 05-page097 | New aluminium turbulent head to increase power by 30% and improve torque. | ||
| View original record | Hs. BY. from R. c. to BJ. Wor. Y5771 R2/M20.6.38. INDIA 3. X.5050 X.5005 X.5771 X.5810 We are sending you this week the new aluminium turbulent head for the above. We are in hopes of this arrangement… | ||
| 05-page098 | Letter from the US office to the UK office requesting details about a 20HP car's engine, performance, and ride quality. | ||
| View original record | ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. X5771 RECEIVED MaEB8728 August 7th, 1928. Mr. E.W. Hives, ROLLS-ROYCE LTD., Derby, England. Dear Hives, In a conversation with you some time ago, you… | ||
| 05-page099 | Relationship between horsepower, weight, and acceleration, with reference to specific car models. | ||
| View original record | To Pt. From Hs/Rn. X5771 Hs/Rn3/LW15.3.28. X5771 With reference to Pt5/PM20.6.28. We attach weights of chassis and power curves as you request. The power given is flywheel HP., the HP. developed at… | ||
| 05-page100 | List of chassis weights for various 40/50 HP models and chassis series. | ||
| View original record | CHASSIS WEIGHTS - 40/50 HP. CHASSIS NO. DATE. LBS. 500 /07 2700 700 /08 2760 900 - 1399 09/10 2800 1400 - 1699 2860 1700 3000 1800 3045 1900 - 2099 3075 } Silver Ghost 2100 - 2699 3110 } power curve… | ||
| 05-page101 | Performance test report on a high compression engine, detailing the effects of ignition advance. | ||
| View original record | FILE x5771 HS. From Ho/Rn. HS/RM2/AD29.11.29. STANDARD H.C. PERFORMANCE TEST. ENGINE. Effect of ignition advance 12-64. This car is fitted with a high compression engine 5.25 to one and a 11/30 axle… | ||
| 05-page102 | Tests carried out on a 112° long duration camshaft for the 'China' engine. | ||
| View original record | V5771 To R. From Hs/ACL. c. to EG. WOR. c. to S. Gs. c. to Ry. Hs/ACL.2/WJ.20.12.29. 112° LONG DURATION CAMSHAFT (CHINA). Tests have now been carried out on the "China" engine with a long duration… | ||
| 05-page103 | Performance graph comparing a 112° long duration camshaft against standard and 116° camshafts. | ||
| View original record | 112° LONG DURATION CAMSHAFT (CHIRA) ENGINE NO G2 - CL STANDARD INDUCTION PIPE EMBODIED 110° BENTLEY MKV BLOCK 1 3/4" LAGONDA 20 HP R.R. CARBURETTER COMPRESSION RATIO :- 5.25 OPEN EXHAUSTS 112°… | ||
| 05-page104 | Clutch slipping issues on high compression 25 HP cars due to increased torque. | ||
| View original record | To Ba. From Ha/AJL. c. to BY. X5771 He/AJL.1/W.8.2.30. X.5300 X.5770 X.5771 CLUTCH SPRINGS ON HIGH COMPRESSION 25 HP.CAR. We are experiencing considerable trouble with clutches slipping on the 5.25:1… | ||
| 05-page105 | Ignition control and timing settings for a high compression 25 HP car. | ||
| View original record | X5771 A. Fmsn RE/WE. B. to DV. C. to FST. RE/AJL.2/3.5.30. [Handwritten annotations on the right side:] X928 X5770 X5771 X5690 IGNITION CONTROL FOR HIGH COMPRESSION 25 HP. CAR. It is found that the… | ||
| 05-page106 | Magneto ignition timing, its limitations, and a recommendation for the 6.25:1 engine. | ||
| View original record | -2- Hs/AJL.3/AL.6.2.30.Contd. MAGNETO IGNITION. The range of advance given by the magneto is limited to 36°; all obtained by hand on the control quadrant. As the automatic governor does not control… | ||
| 05-page107 | Comparative test report on rear axle gear ratios for 25 HP high compression cars. | ||
| View original record | To R. From Hs/AJL. (Held up). YS71 Hs/AJL.1/MJ.7.2.30. c. to Sg. Wor. X.5350 c. to E. Da. X.5771 c. to By. PN. X.488 X.1725 REAR AXLE GEAR RATIO FOR 25 HP. HIGH COMPRESSION CARS. --------------------… | ||
| 05-page108 | Comparison of 11/50 and 12/50 axle ratios through hill climb and road tests, with a recommendation for standard fitment. | ||
| View original record | -2- dry roads and no appreciable wind. The tests were carried out on these hills side by side. TICKNALL HILL. 12/50 axle. Time for hill - 67.5 secs. 11/50 axle. " " " " - 65 secs. This does not appear… | ||
| 05-page109 | Performance improvements and testing for a 20 HP long duration camshaft. | ||
| View original record | 75771 CHP. From Hs/Rn. Hs/Ru.4/W.18.3.30. 20 HP. LONG DURATION CAMSHAFT. x5090 In curve V.761 you shew the 112° camshaft to give a marked improvement in performance above 1750 R.P.M. At 800 R.P.M.… | ||
| 05-page110 | Torque curve data table for a 20 HP engine. | ||
| View original record | EJJ. From Hs/Rn. X8771 Hs/Rn.3/MJ.19.3.30. X634 TORQUE CURVE. 20 HP. ENGINE. ENGINE R.P.M. | FLYWHEEL TORQUE LBS.FT. 500 | 170 1000 | 170 1500 | 165 2000 | 165 2500 | 150 3000 | 135 3500 | 100 | ||
| 05-page111 | Ignition timing settings for the high compression 20-25 HP car. | ||
| View original record | X 5771. To E. From Hs/AJL. c. to BY. c. to MK. Hs/AJL.1/WJ.16.4.30. Handwritten notes: X5480, X5639, X5771 IGNITION TIMING ON HIGH COMPRESSION 20-25 HP. CAR. In Hs/AJL.2/WJ.6.2.30 we gave the… | ||
| 05-page112 | Unfair comparison of long and short duration camshafts and proposing new tests. | ||
| View original record | To R. From Ha/Rm. C. to S. C. to RG. Da. C. to HOr. LONG DURATION CAMSHAFTS. Previously these have always been compared with the short duration camshafts at the same compression ratio. This is clearly… | ||
| 05-page113 | Test report on the performance of a 112° long-duration camshaft, codenamed 'China'. | ||
| View original record | To R. From Hs/CHP. c. to Sc. E. c. to Sv. M. c. to Wor. 112° LONG DURATION CAMSHAFT ("CHINA"). This camshaft (E.55641) has been tested previously and a report circulated (dated D),12,29) dealing with… | ||
| 05-page114 | Engine performance comparing different camshafts, compression ratios, and ignition settings. | ||
| View original record | -2- (with 5.75 C.R.) shows a marked increase in power over the standard engine at speeds above 3200 R.P.M. From the point of view of detonations, the 112° shaft in the 5.75 C.R. engine is noticeably… | ||
| 05-page115 | Performance graph comparing different camshaft and high compression configurations for an engine. | ||
| View original record | 112° CAMSHAFT & HIGH COMPRESSION 'CHINA' ENGINE No. G.G. 58. STANDARD INDUCTION MANIFOLD STANDARD CARBURETTOR (1.75) COMPRESSION RATIO = 5.1:1 OPEN EXHAUST 112° CAMSHAFT, E55340 INLET OPENS 12° BEFORE… | ||
| 05-page116 | Performance chart comparing brake horse power and BMEP against RPM for different camshaft timings. | ||
| View original record | V761 112° LONG DURATION CAMSHAFT (CHINA) Engine IT Spec S1 Compression 7:1 Carb's 'Yin' Petrol & Benzol 50/50 17° Lagging Ign'n R.H. Magneto Compression Ratio 5.3 to 1 Unsupercharged 112° Camshaft,… | ||
| 05-page117 | Ignition timing and control leverage alterations for high compression 21/25 HP cars. | ||
| View original record | SY. from HS/AHL. C. to MX, C. x 5771 Hs/AHL.1/J.5.6.30. xS630 xS771 IGNITION TIMING ON HIGH COMPRESSION 21/25.HP. CARS. Further to our Hs/AHL.1/ar.18.4.30., it would now appear advisable that none of… | ||
| 05-page118 | Ignition timing adjustments for a 20/25 HP car with a high compression engine. | ||
| View original record | COPY. Hs/AJL. From MX. c. EY. K57 Mx./T/3.5.30. X.5770 X.5771 X.5680 IGNITION TIMING ON HIGH COMPRESSION 20/25 HP. CAR. Ref: Hs/AJL/W.16.4.30. As the result of some further experience on the running… | ||
| 05-page119 | Ignition timing for 20/25 HP high compression cars, detailing issues with detonation and comparing settings with low compression engines. | ||
| View original record | To HX. From Hs/AJL. c. to HY. X5771 Hs/AJL.1/W.S.5.30. X928 X1370 X5771 X5680 IGNITION TIMING ON HIGH COMPRESSION 20/25 HP. CARS. With reference to HX.7/T.S.5.30., we have asked the D.O. for the… | ||
| 05-page120 | Page discussing a difficulty with the lack of automatic control on a magneto ignition system. | ||
| View original record | -2- HS/AJL.1/GL.5.5.30.Contd. not appear so inconsistent as at first sight. The difficulty of course is due to there being no automatic control in operation on the magneto ignition. HS/AJL. | ||
| 05-page121 | Recommended battery ignition setting for the high compression 20/25 HP car. | ||
| View original record | V5771 To EP. From Hs/AIL. c. to WX. c. to SY. Hs/AIL.2/W.12.5.30. XYZ?? XZCO. HIGH COMPRESSION 20/25 HP. CAR. IGNITION SETTING. We have recommended and instructed a battery ignition setting of 13º… | ||
| 05-page122 | Road tests of a 112° 'China' camshaft, comparing performance against 'Standard' and 'Japan' configurations. | ||
| View original record | NOT SENT OUT. X5771 To H. From Hs/Rm. c. to SS. Wor. c. to SE. E. c. to EP. Hs/Rm.6/AJ.19.5.30. X.5090. X.5771. X.5770. 112° CAMSHAFT 'CHINA'. We have tried the long duration camshaft on the road in… | ||
| 05-page123 | The effects of long duration camshafts with different types of 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… | ||
| 05-page124 | Fifth report on car comparisons at Brooklands, focusing on cooling performance. | ||
| View original record | TO H. From Hs/Hs. C. to AE. R. C. to OL. Sor. C. to IP. Re. Hs/Rs.7/WJ. 25. 6. 30. X.788. X.4012. X.766. X.1892. X.7771. X.4588. X.5771. X.3531. FIFTH BROOKLANDS REPORT. We have now completed the… | ||
| 05-page125 | Comparison of cooling system specifications and performance against competitor vehicles like Pierce Arrow, Chrysler, and Graham Paige. | ||
| View original record | -2- Ne/Rs.7/Hl.25.3.30.Contd. were not the bonnet louvres the only means of escape for the air. The results indicate that we are well up in the dimensions of our cooling system compared with other… | ||
| 05-page126 | Performance comparison report on various car models, with notes on acceleration and a table of maximum speed test results. | ||
| View original record | -3- Be/Hs.T/Af.25.6.30.Contd. reached on this gear in comfort. We think that the Graham Paige have cleverly exploited the obsolete R.A.C. rating formula and will get a good reputation when compared… | ||
| 05-page127 | Performance gain from a 112° camshaft and higher compression. | ||
| View original record | -4- Ha/Bs.7/W.25.8.30. Contd. gain due to the 112° camshaft and higher compression. | ||
| 05-page128 | Comparative data sheet of various cars on face area, volume, and temperature metrics. | ||
| View original record | Table 1: CAR. | Face Area per 1000 litre disp. per mile. ROLLS-ROYCE 25 HP. | 83.0 sq.ins. CHRYSLER 75. | 62.7 sq.ins. HISPANO | 77.2 sq.ins. ROLLS-ROYCE 40/50. | 71.2 sq.ins. GRAHAM PAIGE | 65.2… | ||
| 05-page129 | Blueprint with two graphs comparing vehicle acceleration figures and speedometer calibrations. | ||
| View original record | Graph 1: COMPARATIVE ACCELERATION FIGURES. Y-axis: ACCELERATION FT/SEC 2. X-axis: ROAD SPEED M.P.H. Data series: GRAHAM PAIGE SILENT THIRD, G.M.K PHANTOM 24.S. GOOD MILES, GRAHAM PAIGE TOP, 14.G.R.… | ||
| 05-page130 | Comparative analysis of cooling system specifications and performance for various car models. | ||
| View original record | COLUMN HEADERS: TYPE OF CAR, DISPLACEMENT, TYPE OF BODY, WT OF COMPLETE CAR AS TESTED | RAC RATING, DISP, WT OF CAR, COMP. RATIO | DIMENSION OF MATRIX, WATER CAPACITY OF SYSTEM, DEPTH OF MATRIX | TYPE… | ||
| 05-page131 | Engine power improvements and comparing the Phantom engine with Ricardo's sleeve valve design. | ||
| View original record | X5771 Hs. E. } FROM R. Ry. } (At Le Canadel) R1/M24.4.31. X.7771 X.5771 X.4540. c. Sg. Wor. PN. POWER FROM OUR CAR ENGINE AND RICARDO SLEEVE. Mr. Elliott shows on 8.4.31 that Derby have long ago got… | ||
| 05-page132 | Power loss in the 25 HP exhaust system and recommending modifications to improve performance. | ||
| View original record | To By. From Hs/Rm. X5771 Hs/Rm.9/RT.6.5.31. 25 HP. EXHAUST SYSTEM. X.5230. X.5771. Now we are getting more power out of the 25 HP we find that we are losing far too much power in the silencer system.… | ||
| 05-page133 | Experiments for increasing the power output on the 25 HP engine. | ||
| View original record | X5771 To RHC. From Hs/Rm. Hs/Rm.2/KT.21.5.31. EXPERIMENTS FOR INCREASING THE POWER OUTPUT ON THE 25 HP. X5771 We have now instructed the following series of experiments with regard to increasing the… | ||
| 05-page134 | Tests on various valve lifts and camshafts for 25 HP and 40/50 engines. | ||
| View original record | To E. From Hs/Rm. Hs/Rm.1/KT. 22.5.31. X5771 POWER OUTPUT 25 HP. AND 40/50. X.5771. X.7771. We are sending you details of the various valve lifts we are trying. The cams we have are - (1) The old… | ||
| 05-page135 | Acceleration and maximum speed tests conducted on three cars at Brooklands. | ||
| View original record | To R. From Hs/Sm. c. to Sg. Wor. c. to K. Da. c. to My. PN. 85771 Hs/Sm.1/KT. 23.6.31. 8788 x-771 BROOKLANDS TESTS. 19.6.31. Tests were conducted on three cars to estimate the acceleration and maximum… | ||
| 05-page136 | Results of performance and acceleration tests on various car configurations. | ||
| View original record | - 2 - He/Bn.1/RT.23.6.31.cont'd. The most interesting point is that with the C.O. open 16.G.IV. is only 1 M.P.H. slower than 18.G.IV. whereas with the C.O. closed this difference is increased to 3.9… | ||
| 05-page137 | Comparative analysis of an 8-cylinder Buick's performance and characteristics. | ||
| View original record | Hs/An.1/KT.23.6.31.cont'd. - 3 - with its improved power, as smooth and silent as the standard car. BUICK. We had a closed 8 cyl. Buick with a displacement of 3620 c.c. for comparison. The weight of… | ||
| 05-page138 | Blueprint graph of Brooklands tests comparing Road Wheel Horsepower and speed for two different engine configurations. | ||
| View original record | SHEET II H.S. 400 G.S.D. BROOKLANDS TESTS 19/6/31 LAP SPEEDS C.O. CLOSED 18 GII 68.7 M.P.H. G.S.R.14 63.2 M.P.H. ROAD WHEEL H.P. C.O. CLOSED 18 GII 35.7 CWTS JAPAN UNIT C.R. 5.25. PT SILENCER TWIN… | ||
| 05-page139 | Performance graph from Brooklands tests comparing clutch horsepower and B.M.E.P against engine RPM for different vehicle configurations. | ||
| View original record | H.3. / 401 H.S. / 401 BROOKLANDS TESTS 19/6/31 LAP SPEED C.O. CLOSED 18GX 68.7 M.P.H. G.S.R.14 63 M.P.H. CLUTCH H.P. B.M.E.P. ENGINE R.P.M. ROAD SPEED M.P.H. 18 GX 35.7 CWTS JAPAN UNIT TWIN ZENITHS 26… | ||
| 05-page140 | Graph from the Brooklands tests comparing engine performance with different camshaft and carburettor setups. | ||
| View original record | SHEET I HS 402 BROOKLANDS TESTS. 19/6/31 LAP SPEED C.O. OPEN 18 G III 70-64 MPH 18 G IV 69-66 Upper Test Configuration: 18 G IV 35-7 CWTS JAPAN UNIT C/R 5.25 TWIN ZENITH 26MM CHOKES 112° CAMSHAFT OPEN… | ||
| 05-page141 | Modifications to improve the power output of the 'China' engine, using parts proven on the 'Japan' engine. | ||
| View original record | SECRET. To By. From Hs/Rm. Ha/Rm.S/RT. 23.6.31. X.5770. X.5771. IMPROVED POWER OUTPUT CHINA. It is now apparent that Japan III is a long way off. When it arrives it is going to need a lot of… | ||
| 05-page142 | Summary of bench test results on 'Japan' engines to improve power output by testing various components. | ||
| View original record | FOR FILES. 8571 Ha/Rm.8/WJ.30.6.31. A number of bench tests were carried out on 'Japan' engines with a view to improving the power output. Curve V.1160 shows the back pressure due to the various… | ||
| 05-page143 | Graph showing BMEP variation with increased tappet clearance against RPM. | ||
| View original record | BMEP VARIATION (18.10.38) WITH INCREASED TAPPET CLEARANCE V1148 BMEP Loss/Gain RPM INLET VALVES .010 EXH. VALVES .020 INLET VALVES .010 EXH. VALVES .060 INLET VALVES .060 EXH. VALVES .100 ENGINE NO.… | ||
| 05-page144 | Power comparison graph for Engine 149.N.G.8, testing different carburettor and camshaft configurations. | ||
| View original record | 'JAPAN' POWER COMPARISON V1149 AXIS LABELS: B.H.P. R.P.M. B.M.E.P. LBS. PER SQ. INCH (B.M.E.P.) [IND. M.E.P. AT 85% M.I.] CURVE LABELS: TWO CLAUDEL-HOBSON CARBS. 120° LONG DURATION CAMSHAFT TWIN-CHOKE… | ||
| 05-page145 | Performance graph comparing 'JAPEN' silencer configurations on engine unit N G8. | ||
| View original record | SILENCER COMPARISON ('JAPEN') ENGINE UNIT No. N G8 (5.25:1 COMP. RATIO) 120° LONG DURATION CAMSHAFT TWIN-CHOKE ZENITH CARB. (SMALL BORE IND. PIPE) COMPLETE FULL LONG TYPE EXHAUST SILENCER TO No. 368/V… | ||
| 05-page146 | Graph of exhaust back pressure curves versus R.P.M. for various silencer configurations. | ||
| View original record | EXHAUST BACK PRESSURE CURVE ('JAPAN') ENGINE UNIT N.W.G.A. (5.25:1 COMPRESSION RATIO) 'H' LONG DURATION CAMSHAFT TWIN-CHOKE ZENITH CARB. SMALL BORE INS. PIPE ALL CURVES TAKEN WITH THREE DOWNTAKE PIPES… | ||
| 05-page147 | Graph showing B.M.E.P. variation with different valve timings for engine unit NA IV GB. | ||
| View original record | V1161 B.M.E.P VARIATION WITH VALVE TIMING ("JAPAN") ENGINE UNIT NA IV GB SPECIAL 120° LONG DURATION CAMSHAFT (5.85:1 COMP. RATIO) TWIN-CHOKE ZENITH CARB. LARGE BORE INDUCTION PIPE "A" TIMING "B"… | ||
| 05-page148 | Performance graph comparing power curves for an IVG.S engine unit under different carburettor and exhaust configurations. | ||
| View original record | POWER COMPARISON CURVES (JAPAN) ENGINE UNIT IV G.S (5.72:1 COMP. RATIO) SPECIAL 100/130M. DURATION CAMSHAFT VALVE TIMING (.010" CLEARANCE) I.O. 12 1/2 A.T.D.C. E.O. 45 B.B.D.C. I.C. 52 1/2 A.B.D.C.… | ||
| 05-page149 | Bench tests carried out to improve the performance of the 25 HP power unit. | ||
| View original record | To R. from He/Rm. c. Sg. c. Wor. L. c. De. RV. 85771. He/Rm3/AM.5.8.31. IMPROVED PERFORMANCE 25 H.P. We carried out some bench tests to see how much we could increase the power output of "China"… | ||
| 05-page150 | Car performance testing, detailing propeller shaft modifications, lap speeds, and handling characteristics under various conditions. | ||
| View original record | Eg/Bm3/AMB.S.R.31. contd. -2- A 3" dia. propeller shaft was fitted to prevent whirling - we already have a design of cross member which enables us to utilise this. The P.II. exhaust system was fitted… | ||
| 05-page151 | Performance graph from Brooklands tests showing BHP, MEP, and induction against RPM. | ||
| View original record | 12 GW BROOKLANDS TESTS AUG. 1931 R.M. 27 CHINA UNIT 112 SHAFT CO. OPEN HIGH LIFT ROCKERS S 65 C/R S.U. H.V. 5. CARB 1/1.50 AXLE RATIO STD & 1/8 LARGER B.H.P M.E.P. B.M.E.P 76-82 MPH 73.45 MPH… | ||
| 05-page152 | Graph comparing the performance and back pressure of five different exhaust systems against engine RPM. | ||
| View original record | RM 26 COMPARISON OF EXHAUST SYSTEMS. CHINA. J12 SHAFT HIGH LIFT ROCKERS. 5.65 C/R STD 15% LARGER CARB. ① OPEN EX. ② PII EX. SYSTEM ③ W.W. Mch. 3256 Fd FISHTAIL ④ W.W. Mch. 3256 25HP FISHTAIL ⑤ STD 25… | ||
| 05-page153 | Brooklands performance test sheet for a close-coupled four-seater, comparing different carburettor and engine power configurations. | ||
| View original record | RM. 28 12 G IV BROOKLANDS TEST 14/8/31 CLOSE COUPLED FOUR SEATER WT. 32-25 CWT AXLE RATIO 11x50 TYRES 6" FORT DUNLOPS 19" RIMS. 60 MPH = 3000 RPM CONDITION OF CAR AND UNIT 1) CAR IN STANDARD T SERIES… | ||
| 05-page154 | Results of acceleration and hill climbing tests on a 25 HP car. | ||
| View original record | To R. From Ha/Rm. c. to Sg. Wor. c. to Da. R. c. to By. IMPROVED PERFORMANCE 25 HP. With a view to confirming the low speed performance of the car on which the recent higher speeds were obtained on… | ||
| 05-page155 | Low speed performance and acceleration test results for a close-coupled tourer comparing different carburettor and silencer units. | ||
| View original record | LOW SPEED PERFORMANCE TESTS SUBSEQUENT TO BROOKLANDS TESTS H3/RM.V/AD15.8.31. 12-04 CLOSE COUPLED TOURER 11 X 50 AXLE. CAR WEIGHT TWO PASS. 10 GALLS PETROL 34.75 CWT. UNIT POWER AS IN CURVE No.27. P.2… | ||
| 05-page156 | Power output tests for the 'Japan' engine, detailing findings on carburettors, induction, and valve timing. | ||
| View original record | X5771 To R. From Hs/Rm. c. to Sg. Wor. c. to Ds. E. c. to Dy. Y5090. POWER OUTPUT - JAPAN. We have carried out a number of tests on 'Japan' with a view to obtaining information as to power output… | ||
| 05-page157 | Tests on induction pipes, carburettors, and valve clearances. | ||
| View original record | -2- Hs/Rm.6/U.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… | ||
| 05-page158 | Blueprint graph showing the effect of increasing induction on engine performance with twin carburettors. | ||
| 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 .384 VALVE LIFT. B.H.P. R. P. M.… | ||
| 05-page159 | Performance graph and specifications 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. B.H.P. R.P.M. B.M.E.P. INDUCTION DEPN INS H G… | ||
| 05-page160 | Performance comparison graph of four different carburettor arrangements. | ||
| 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… | ||
| 05-page161 | Performance comparison graph of three different carburettor configurations, plotting B.HP and B.M.E.P. against engine R.P.M. | ||
| View original record | RM. 28 19/8/3 CARBURETTER COMPARISON ON CHNA S-H C/R HIGH OUTPUT COIL 10° SHAFT ① ---- SU CARB 1 5/8" THROTTLE DIA ② ----- SOLEX CARB 1 5/8" THROTTLE DIA 29 MM CHOKE ③ ----- STD 1 5/8" LARGER R.R. 1… | ||
| 05-page162 | Graph comparing two timing alterations on a 112° camshaft with two Claudel carburettors. | ||
| 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… | ||
| 05-page163 | Performance graph comparing induction pipe capacities for a 'Japan Unit' engine. | ||
| View original record | 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 MIN CLCE… | ||
| 05-page164 | Graph comparing the performance curves of single and double Claudel carburetor setups. | ||
| 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 CLEAR ROUND INLET VALVE .275" B.H.P. R.P.M. B.M.E.P INDUCTION DEPN INS… | ||
| 05-page165 | Photograph showing a side view of an inline-six engine installed in a chassis. | ||
| View original record | No legible text is visible. | ||
| 05-page166 | Montage of photographs displaying various engine carburetor and manifold configurations. | ||
| View original record | ", | ||
| 05-page167 | Correcting details in a power output report for Japan. | ||
| View original record | To. R. From Ha/Rm. c. to Sg. Fox. c. to La. E. c. to Hy. K577 Ha/Rm.9/WJ..10.31. Re. POWER OUTPUT - JAPAN. X.5771. X.9090. Please note that in report Ha/Rm.6/WJ.24.9.31 the induction pipe depression… | ||
| 05-page168 | Analysis of 25 HP engine power output concerning increased valve lift and clearance around the inlet valve. | ||
| View original record | X5771 To E. from Hs/Rm. Hs/Rm.2/ADB.10.31. 25 HP. POWER OUTPUT. Increasing Valve Lift. We have been analysing the curves on increased valve lift. RM.44. These curves show that - A. When the flow round… | ||
| 05-page169 | Performance graph comparing high and low lift rockers on a Japan Unit engine. | ||
| 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 55840 CLCE (MIN) OF ·225 MACHINED ROUND INLET VALVE VALVE LIFT ·344… | ||
| 05-page170 | Graphical comparison of performance for high and low lift rockers with twin zenith carburettors. | ||
| View original record | R.M.44 COMPARISON OF HIGH & LOW LIFT ROCKERS WITH TWIN ZENITH CARBS. INLET VALVE DIA 1 1/4" OPEN EXHAUST 1 1/2" CAMSHAFT F.55640 JAPAN UNIT B.H.P. M.E.P. R.P.M. SECTION A: LIFT .395 LIFT .344 COMP.… | ||
| 05-page171 | Performance comparison of high and low lift rockers with ramming, showing BHP vs RPM curves and valve timing diagrams. | ||
| View original record | COMPARISON OF HIGH & LOW LIFT ROCKERS, WITH RAMMING RM.45 CLAUDEL CARBS. JAPAN A C/R 5.15 HEAD MACHINED TO GIVE .225 CLCE ROUND INLET VALVE BEST TIMING FOR POWER 1 1/2" CAMSHAFT VALVE LIFT .395 VALVE… | ||
| 05-page172 | Performance graph showing the effect of increasing clearance around the inlet valve tappet. | ||
| View original record | EFFECT OF INCREASING CLEARANCE ROUND INLET VALVE TAPPET OPEN EXHAUST 112º CAMSHAFT E.58840 .314 VALVE LIFT 2 CARBURETTORS 28m/m CHOKES RUNNING PIPES COMPRESSION RATIO 5.95 VALVE LIFT .344 .013… | ||
| 05-page173 | Blueprint graph showing the effect of increasing clearance around the inlet valve on engine performance. | ||
| View original record | R.M.47 EFFECT OF INCREASING CLEARANCE ROUND INLET VALVE JAPAN TWIN ZENITH CARBS. OPEN EXHAUST 112° CRANKSHAFT E 55390 14° DIA. INLET VALVES TIMING TOO EARLY FOR MAX. POWER S/R 5.35 VALVE LIFT .344… | ||
| 05-page174 | Sketch showing modifications to a Japan cylinder head to give increased clearance around inlet valves. | ||
| View original record | H/P...s/AD. 57.10.37 RECENT MACHINING INLET R + 300 DIA 1.000 RAD. 180 MOD. HEAD 350 RAD. 1.125 RAD. SKETCH SHOWING MODIFICATIONS TO JAPAN CYLINDER HEAD TO GIVE INCREASED CLEARANCE ROUND INLET VALVES. | ||
| 05-page175 | Engine power output tests for the 10,000-mile car, detailing modifications to the camshaft, pistons, and exhaust system. | ||
| View original record | To R. from Hs/Rm. c. Sg. c. Nor. Fa. Service Ex. Y5771 Re/Rm.1/AEW27.10.31. POWER OUTPUT - 10,000 MILE CAR. X5330. We have now had the engine on the test bed which has been prepared for the next… | ||
| 05-page176 | Performance graph comparing the C.I. and C.XI engine units over a range of RPMs. | ||
| View original record | COMPARISON OF C.I. UNIT WITH 5.70 C/R & C.XI UNIT FOR 10,000 MILES P.II COMPLETE SHORT TYPE SILENCER USED IN BOTH CASES C.I. UNIT 112' SHAFT. HIGH LIFT ROCKERS C.XI Sch 1542/3 CAMSHAFT PISTONS E 57122… | ||
| 05-page177 | Power curves for a unit after a 10,000 mile test, comparing five different exhaust system configurations. | ||
| View original record | POWER CURVES UNIT FOR 10,000 MILES TEST 18.G.IV C.XI C/R 5.7 CAMSHAFT Sch: 1542/3 STANDARD CARB 15% LARGER ① OPEN EXHAUST ② COMPLETE P.II. SHORT TYPE Ex. SYSTEM ③ N.Sch 3285/6/7 WITH FISH TAIL. EXIT… | ||
| 05-page178 | Experiments with intake pipe and carburetter designs to improve fuel distribution and power output for the J.1 engine. | ||
| View original record | 85771 To R. From Ha/Wm. c. to Sr. Wor. c. to S. Da. c. to Hy. Ha/Rm.1/M.17.11.31. x5080 DISTRIBUTION AND POWER OUTPUT. J.1. You will recollect that we managed to obtain good power with a 1 7/8… | ||
| 05-page179 | Report comparing carburetter performance with different pipe configurations and engine types, including M.E.P. data. | ||
| View original record | -2- Ha/Rm.1/WJ.17.11.31.Cont'd. the lower the depression at which the carburetter works (or larger the carburetter) the more critical the distribution becomes, and for this reason are very satisfied… | ||
| 05-page180 | Power output graph for the 'China Unit' engine, showing performance with different carburettor and valve configurations. | ||
| View original record | [ "POWER OUTPUT CHINA UNIT C/R", "RM. 51", "112° CAMSHAFT INLET & EX. CAMS. TO E.55358", "HIGH LIFT ROCKERS. OPEN EXHAUST.", "INLET VALVE DIA. 1·4 MIN CLCE ROUND", "INLET VALVE .225", "1 7/8 S.U. ①",… | ||
| 05-page182 | Blueprint for an induction pipe for a 1.875 bore S.U. carburettor, with notes on fittings and finish. | ||
| View original record | V1236. 2.750 2.250 HOT SPOT FITTING SIMILAR TO THOSE ALREADY EXISTING 300 EXC. 2.750 RAD 1.250 IT'S IMPORTANT THAT THESE EDGES BE AS SHARP AS POSSIBLE USE EXISTING FLANGE ALL OTHER DIMENSIONS SEE SCH.… | ||
| 05-page183 | Dynamometer test results for the 20-EX model, investigating power loss from the carburetter air silencer and various exhaust system modifications. | ||
| View original record | COPY. X5771 23.11.31. -------- X.5771. X.5086. X.5230. 20-EX DYNAMOMETER TESTS. We give herewith results of test on the dynamometer the object of which was to determine the power lost in the… | ||
| 05-page184 | Graph showing power loss for a PH carburetter air silencer on a Standard Car - 20 EX. | ||
| View original record | P.H. CARBURETTER AIR SILENCER POWER LOSS STANDARD CAR - 20 EX B.H.P. (CORRECTED) AT ROAD WHEELS ENGINE R.P.M. CUT OUT OPEN CUT OUT CLOSED STANDARD CARB'R AIR SILENCER AIR SILENCER OFF COMPLETE ALL… | ||
| 05-page185 | Engine performance test report for the Derby 30 HP car, analysing power curves with different configurations. | ||
| View original record | a. From Mr/ Hs/ Hr. c. to Mr. H.F. c. to Mr. C.R. c. to Mr. My. 857/76 RE/EM.3/G/10.12.31. x5090 EXTRA OUTPUT DERBY30 H.P.CAR. We have now had power curves off three further engines fitted with the… | ||
| 05-page186 | Performance graphs for a CXII High Lift Unit showing power output and compression with various manifold and silencer setups. | ||
| View original record | UNIT FITTED TO 20 G & K CHINA RM 53 POWER OUTPUT CXII UNIT HIGH LIFT CAMSHAFT B.57177 (110 S°) 5.78 C/R KEY: ① CUT OUT OPEN ② SMALL MANIFOLD (1.6 DOWNTAKE) FRONT EXP. BOX P.I. SILENCER 1:5 FISHTAIL ③… | ||
| 05-page187 | Power output and compression pressure curves for a Ctr. Unit China engine with varying exhaust systems. | ||
| View original record | POWER OUTPUT CTR UNIT CHINA CAMSHAFT E.S.7177 (110.5°) C/R 5.74 STANDARD 15% LARGER RR CARBURETTER ① OPEN EXHAUST ② C.O. OPEN ③ COMPLETE EXHAUST SYSTEM 16 DOWNTAKE Ex. In. O OTO.CLCE 9 40.5 43.7 Comp… | ||
| 05-page188 | Blueprint graph of engine performance showing power output, BMEP, and compression pressure against RPM. | ||
| View original record | POWER OUTPUT CTR. UNIT CHINA R.M. 55 CAMSHAFT E.57177 (10.5") C/R 5.74 STANDARD 1.875" LARGER R.R. CARBURETTER ① COMPLETE EXHAUST SYSTEM 1.5" PIPES PT SHORT ② SILENCER SMALL FRONT EXPANSION BOX AS… | ||
| 05-page189 | Performance graph comparing two engine configurations, showing power output and mean effective pressure versus RPM. | ||
| View original record | R.M. 57 POWER OUTPUT C/D UNIT FOR R.G. IV ① CAMSHAFT E.57177, "O.S" PISTONS E.57122 COMPRESSION RATIO 6.7 - 1 RII SHAFT TYPE 1 1/8 INSIDE DIA. 1 1/4 DIA. Valve Timing Diagram: IN EX 10° 50° .020 CLOSE… | ||
| 05-page190 | On the readiness of dual carburetters for fitting to a 15-S-IV and testing on a Japan I unit. | ||
| View original record | To R. From Ha/an c. to Sg. er. c. to E. Da. c. to HV. X577 /BS.1/RU.14.12.31. X8080 TW. RYDER DUAL CARBURETTERS TO La.1.2124 We have now got these carburetters to a condition where they are ready for… | ||
| 05-page191 | Blueprint graph of engine power output and valve timing for a Japan Unit with R.R. Carbs. | ||
| View original record | POWER OUTPUT WITH R.R. CARBS TO LEC 2924 JAPAN UNIT 112º SHAFT. INLET & EXHAUST CAMS TO E.55358 HIGH LIFT ROCKERS OPEN EXHAUST. INLET VALVE DIA 1.6 MACHINED TO GIVE MIN CLCE .225 ROUND VALVE. C.R.… | ||
| 05-page192 | Requesting the replacement of a blueprint due to an error in its title. | ||
| View original record | To R. From He/Rn. c. to SG. Mor. c. to K. Ds. c. to My. X5771 Hs/Rn.3/A.14.12.31. X5080 DISTRIBUTION AND POWER OUTPUT.L.I. Will you please replace print No. Rn.31 attached to memo Hs/Rn.1/WJ.17.11.31.… | ||
| 05-page193 | Blueprint graph of power output against R.P.M. for a 'Japan Unit' with specified engine configurations. | ||
| View original record | POWER OUTPUT JAPAN UNIT C/R 5-65-1 RM 51 112° CAMSHAFT INLET & EX. CAMS TO E.55358 HIGH LIFT ROCKERS. OPEN EXHAUST INLET VALVE DIA 1·4 MIN CL'CE ROUND INLET VALVE ·225 1 7/8 S.U. ① CLAUDEL ② B.H.P.… | ||
| 05-page194 | Performance graph comparing horsepower (HP) against RPM for various engine configurations. | ||
| View original record | LORD CHOLMONDELEY GFT 43 NO 448 H.P. R.P.M 20.5 M.P.H 41.03 M.P.H. 61 1/2 M.P.H. 71.75 M.P.H G.F.T. 43 AS BELOW WITH STANDARD VALVE SPRINGS G.F.T. 43 AS BELOW BUT WITH H2 CAMSHAFT & EXP COIL G.F.T. 43… | ||
| 05-page195 | Engine development and power improvement experiments for the Bentley 20-2-4. | ||
| View original record | c. From HA/Sn. c. To Mr. EH. c. To Mr. MY. c. To Mr. DA. K5774 HA/sn/A4. 24.12.31. XEROX ENGINE DEVELOPMENT ON BENTLEY 20-2-4. We have been considering means of improving the power output of the 25… | ||
| 05-page196 | Performance analysis memo detailing brake horsepower figures and discussing Brooklands lap times. | ||
| View original record | HW/Wal/MA.24.12.31. Cont'd At 70 M.P.H. Carb. 6 B.H.P. Comp. Ratio. 4 B.H.P. Cut Out. 7 B.H.P. 19 B.H.P. on 70 M.P.H. or 37% increase. At 80 M.P.H. Carb. 11 B.H.P. Comp Ratio. 4 B.H.P. Cut Out. 7… | ||
| 05-page197 | Performance graph comparing standard, 50% larger, and 100% larger chokes on a China O/C Unit. | ||
| View original record | R M 61 COMPARISON OF STANDARD, 50% LARGER AND 100% LARGER CHOKES. CHINA O/C UNIT. ALL TESTS C.O. OPEN 20 & 1/2. EXHAUST SYSTEM C/R 5.75. CAMSHAFT E 57177 110.5° EX IN .020 CLE'E 40.5° 44° CARB. AS ON… | ||
| 05-page198 | Carburetter tests for the 20/25 HP model, comparing an experimental S.U. carburetter with the standard version. | ||
| View original record | To Mr. Hives From Hs/Rm. 45771 H. Mr. R. Mr. C. Mr. G. Mr. CARBURETTER TESTS - 20/25 HP. On 13.11.33, we demonstrated our expl. car 18.G.IV. fitted with an S.U. carburetter having a throttle edge slow… | ||
| 05-page199 | Graph of acceleration curves comparing the Phantom I, Silver Ghost, and 20 HP models. | ||
| View original record | ACCELERATION CURVES SPEED M.P.H. TIME TAKEN SECS. Phantom I Silver Ghost 20 H.P. BOTH TOURING CARS ARE STANDARD PHANTOM I. 5 SEATERS 1.87 TONS 20 H.P. | ||
| 05-page200 | Performance graph for the 20 HP flywheel clutch, including chassis weight specifications for various configurations. | ||
| View original record | 20 H.P. CHASSIS WTS OIL WATER 14 GALLS PETROL 4 TYRES & WHEELS BATTERY AND SPARE WHEEL CARRIER PRE FRONT WHEEL BRAKES 2483 LBS POST FRONT WHEEL BRAKES 2517 LBS BALLOON TYRES ON POST F.W.B. CAR 20 H.P.… | ||
| 05-page201 | Comparative horsepower curve graph for the Silver Ghost and Phantom models. | ||
| View original record | B.H.P. 110 100 90 80 70 60 50 40 30 20 500 1000 1500 2000 R.P.M. PHANTOM SILVER GHOST FLYWHEEL H.P. C.O. OPEN. COMPARATIVE HORSE POWER CURVES. SILVER GHOST & PHANTOM | ||
| 05-page202 | Fitting of an aluminium head to a 20 HP engine, its effect on power, carburetter limitations and compression ratios. | ||
| View original record | To NA. From Hs/P Hs/RaL/L.G18. 8.28. X5771 X5770 With reference to NA2/B8728. The engine fitted to Mr. Royce's car was an absolutely standard 20 HP. unit. In two or three weeks we hope to fit it with… | ||
| 05-page203 | Cover note sending required curves in response to a previous reference. | ||
| View original record | 45771 To NA. From Hs/Rn. Ha/Rml/LG30.8.28. With reference to NA2/B3.4.28. herewith the curves you require. Hs/Rn. | ||
| 05-page204 | Slow running issues on the 20 HP engine and a proposed test of a Zenith carburetter. | ||
| View original record | Hs. from E. c. to BJ. X5771 E2/M24. 8. 28. RE. 20 HP. SLOW RUNNING. X.5771 X.508) X.1053 The general standard of slow running on the 20 HP. has never been superlatively high, and this we have… | ||
| 05-page205 | Telephone message discussing the disappointing lack of expected engine performance improvements on a 20 HP model. | ||
| View original record | RECEIVED OVER TELEPHONE 25.4.29. V5771 FROM R. TO BY. I am somewhat surprised that no definite improvement was found between London Trials and G.4. One can only think there is some quite remarkable… | ||
| 05-page206 | Five performance improvements for the 20 HP car, focusing on engine and exhaust modifications. | ||
| View original record | HS. From R. c. to Ss. Nor. c. to Ey. RHO. 1577 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… | ||
| 05-page207 | Declining sales of the 20 HP Chassis and suggesting potential improvements or its discontinuation. | ||
| View original record | CONFIDENTIAL & SECRET! X5771 SG. )From C.C. to Nor. Hs. Ds. E. R.5/AH.10.29. Despatched 17.10.29. X.5770 X.5830 X.5771 20 HP. CHASSIS. The following is humbly suggested from my views of the above.… | ||
| 05-page208 | Engine power improvements and standardising cutouts on 20HP 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… | ||
| 05-page209 | Adoption of improvements to parts under the bonnet. | ||
| View original record | -2- I feel that our only hope is to adopt as soon as possible improvements (1), (2), and (3). These will only effect parts under the bonnet - i.e. neither chassis or bodies, now that we have the extra… | ||
| 05-page210 | Proposal to supercharge the 'Twenty' model car. | ||
| View original record | SG. From R. c. to Wor. C. c. to FN. Hs. c. to Ey. X5771 R.1/M29.10.29. re. SUPERCHARGED 'TWENTY'. X.5770 X.5771 X.4550 It appears to me definitely that it would be fatal to supercharge our big engine… | ||
| 05-page211 | Experiments to increase the power output of the 'China' engine. | ||
| View original record | COPY. X5771. To R. from Hs/ACL. c. Sr. c. Sgr. E. c. to Da. By. Hs/ACL5/AD29.10.29. X.5771. X.6900. X5770. "CHINA" ENGINE - EXPERIMENTS TO INCREASE THE POWER OUTPUT. We have just completed the first… | ||
| 05-page212 | List of six modifications made to an engine to increase power, detailing changes to components like compression ratio, valves, and camshaft. | ||
| View original record | -2- modifications to the engine :- (1) The compression ratio was increased from 4.75/1 to 5.25/1. The latter is the same ratio as used on the turbulent head engine in 16-G4 at W.W. (2) The valve seats… | ||
| 05-page213 | The promising results of modifications and tests on a large core engine. | ||
| View original record | -3- that the large core engine has an appreciable higher B.M.E.P. particularly at high speeds. It will be noticed that the power peaks at a higher speed. Results so far appear very promising because… | ||
| 05-page214 | Performance graph showing increased power output for the 'China Engine' with various engine specifications and valve timings. | ||
| View original record | INCREASED POWER OUTPUT (CHINA ENGINE) ENGINE 'F' 30-C-S COMPRESSION RATIO = 5.25 12½° INCLINE CAMSHAFT LARGE VALVES (1-400 DIA) STANDARD INDUCTION MANIFOLD 1⅛" CARBURETTOR CYL. BLOCK (No 7) PRESSURE… | ||
| 05-page215 | Experiments and modifications made to increase the power output of the 'China' engine. | ||
| View original record | To R. from HA/ACL. c.c. SG. c.c. HGT. E. c.c. DA. RV. Handwritten: X 5771. Hs/ACLA/AUG.11.23. Handwritten: X5770 (crossed out) X5771 For sketch See Original "CHINA" ENGINE - FACTORS WHICH HAVE… | ||
| 05-page216 | Comparison of engine performance with different carburettor, induction, and valve configurations. | ||
| View original record | HS/AGL/AR.11.22. Contd. -2- very low depression at low speeds renders it very poor for "pick up" and acceleration. We have however, enlarged the chokes and air ports of the Std. 20 HP. carburetter so… | ||
| 05-page217 | Analysis comparing engine performance curves based on variations in camshafts, valves, and compression ratios. | ||
| View original record | -3- Compare this with curve 'A' and the difference of 11 B.H.P. (or 15%) represents the combined gain due to the larger valves and 116° camshaft. We have not yet separated the effects of the 116°… | ||
| 05-page218 | Engine modifications to achieve 75 B.HP and the results of exhaust system tests. | ||
| View original record | -4- LBA/A3.1/AE.11.22 contd. have increased the chokes and air ports by 46%. This higher curve giving a maximum of 75 B.H.P. with open exhaust represents what we could obtain without much modification… | ||
| 05-page219 | Testing an experimental exhaust manifold, comparing engine power curves and planning future modifications. | ||
| View original record | -5- We are therefore fitting up for test, an experimental exhaust manifold similar to Phantom II with the exhaust down pipe increased to 1.750 dia. Comparing the power curve of the standard Chine… | ||
| 05-page220 | Power increase modifications for the 25 HP 'China' engine, focusing on timing, valve sizes, and materials for the Phantom II. | ||
| View original record | COPY. SECRET AND URGENT. X5771 HS. FROM R & E. R.1/M.4.11.29. c. to SG. WOP. BY. X.5770 X.5771 X.1725 re. 'CHINA' ENGINE 25 HP. POWER INCREASE. Referring to your report Hs/ACL1/AD2.11.29., we do not… | ||
| 05-page221 | Communication detailing modifications to engine components including the cylinder head, coreboxes, camshaft, and valve springs. | ||
| View original record | R.1/W/4.11.29. Contd. head all to be 1.5 but we shall see what is possible with the existing cylinder studs and tappet rods. There will be alterations to the coreboxes for the head, and the pattern… | ||
| 05-page222 | Test report comparing the power output and detonation characteristics of 116° and 110° camshafts on the 'China' engine. | ||
| View original record | To H. from HS/AGL. C. SS. C. G.F. L. C. DA. HV. "CHINA" ENGINE - CAMSHAFT COMPARISON ON THE HIGHER OUTPUT ENGINE. We have completed a test on the China engine comparing the power output given by 116°… | ||
| 05-page223 | Camshaft and compression ratio testing, and the preparation of a large bore turbulent head engine for power curve analysis. | ||
| View original record | HS/AEL.2/AEH.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 detonations at low speeds. It might… | ||
| 05-page224 | Blueprint graph comparing engine power curves resulting from different camshaft timings and specifications. | ||
| View original record | 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. 46% LARGER ZORPER CARB. CYL.BLOCK… | ||
| 05-page225 | Comparison of the power output between 'Japan' and 'China' type engines. | ||
| View original record | X5771 To S. from Hs/GHP. c. SS. c. Sor. E. c. Ds. EV. HS/GHP9/ADW.11.29. POWER OUTPUT OF "JAPAN" ENGINE. The power curve V.743. shews a comparison between the output of the "Japan" engine as fitted to… | ||
| 05-page226 | Performance analysis of a Japanese engine, detailing modifications to the induction pipe and comparison of detonation issues. | ||
| View original record | -2- high speeds by smaller exhaust valve and slightly smaller inlet valve. The full throttle distribution on the Japan engine is very good indeed at all speeds, indicated by a consistent power drop on… | ||
| 05-page227 | Performance comparison graph of the 'Japan' and 'China' engines, plotting Brake Horse Power and B.M.E.P. against R.P.M. | ||
| View original record | "JAPAN" ENGINE COMPARED WITH HIGHER OUTPUT "CHINA" ENGINE. CONDITIONS COMMON TO BOTH ENGINES:- COMPRESSION RATIO = 5.25. 46% LUBREX, 80cc P.R. CHOKE. 110° CAMSHAFT (STANDARD TIMING). OPEN ENGINES.… | ||
| 05-page228 | Comparison of a 116° camshaft against a standard 110° camshaft on a Standard China Engine. | ||
| View original record | COPY. X5771. To R. From Hs/ACL. c. Sr. c. Wcr. E. c. Da. Ev. Hs/ACL9/AD12.11.29. X.5771. X.5090. 116° CAMSHAFT ON STANDARD CHINA ENGINE. We have compared the 116° camshaft (E.55362) with the Std. 110°… | ||
| 05-page229 | Recommendation to use the standard camshaft over the 116° version under specific suboptimal conditions. | ||
| View original record | -2- Ha/ACL9/AM2.11.29.Contd the benefit. Therefore where conditions are such that the 116° camshaft does not give its best at max. speed - due to valves, ports or induction system,- it would seem… | ||
| 05-page230 | Performance comparison graph for 110° and 116° camshafts in a standard 'Chuk' engine, detailing valve timings. | ||
| View original record | CAMSHAFT COMPARISON (STD 'CHUK' ENGINE) ENGINE No G.S.C.5 (3"x5.50" BORE) COMPRESSION RATIO = 4.75 STANDARD INDUCTION SYSTEM STANDARD 20H.P. CARBURETTOR OPEN EXHAUST BRAKE HORSE POWER B.M.E.P. (LBS… | ||
| 05-page231 | Testing long duration cams and increased tappet clearance on a 25HP 'CHINA' engine to improve high-speed power. | ||
| View original record | HS. From R. c. to Sg. c. to Wor. c. to Ey. 25HP. 'CHINA'. R.3/A16.11.29. X.5770 X.5090 Long duration cams should be tried at 110°, 112°, or 114°, as well as the 116°. This gives more lap, which, if no… | ||
| 05-page232 | Camshaft comparisons for the 'Japan' engine, also referencing the 'China' engine. | ||
| View original record | X 5771 To R. from Hs/ACL. c. BG. c. SUT. E. c. Da. RV. Ha/ACL2/AD10.11.29. CAMSHAFT COMPARISONS ON 'JAPAN' ENGINE. X5771 X5090 We have now compared the 115º camshaft with the std. 110º on the 'Japan'… | ||
| 05-page233 | Test report detailing B.M.E.P. values at different R.P.M. for a modified camshaft and outlining future tests. | ||
| View original record | -2- speeds of 3000 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° dwell inserted and the… | ||
| 05-page234 | Performance test report comparing a Limousine coupe car 12-G4 and a Hooper cabriolet 14-G4. | ||
| View original record | from Hs/Rm. c. Hs/AJL. File x 5771 Hs/Rml/AD27.11.29. PERFORMANCE TEST 26th NOVEMBER. Tests were carried out between a Limousine closed couple coupe car 12-G4 fitted with a standard engine having 5.25… | ||