Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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DescriptionDateIdentifier
Notes on compression tests for different engine piston rings and cylinder configurations.24th Apr 1908Box 19 \ 7  Scan005
Letter to Mr. Royce regarding a proposal to increase the standard engine compression volume.21th Sep 1910Box 19 \ 7  Scan006
Telegram from Royce to Barrington with instructions to increase a clearance with a specified tolerance.22th Sep 1910Box 19 \ 7  Scan007
Engine vibration differences between the 1300 and 1400 series due to cylinder capacity measurement errors.27th Sep 1910Box 19 \ 7  Scan008
Proposal to modify engine volume to 27 cubic inches to improve smoothness, reduce crankshaft rattle and other issues.27th Sep 1910Box 19 \ 7  Scan009
Letter detailing the decision to cease increasing engine compression due to a list of resulting faults.1st Oct 1910Box 19 \ 7  Scan010
Letter discussing engine B.HP for the 1913 car, with handwritten notes comparing the hill-climbing performance of car '1601' to the 'Silver Phantom'.1st Oct 1910Box 19 \ 7  Scan011
List of high compression and long stroke engines prepared by the Repair Department.7th Oct 1910Box 19 \ 7  Scan012
Continued list of numerical references for High Compression engines.18th Aug 1910Box 19 \ 7  Scan013
List of high compression engine numbers that have had their compression lowered since leaving the works.18th Aug 1910Box 19 \ 7  Scan014
'sweetness of running' in engines, focusing on balance and compression.22th Sep 1910Box 19 \ 7  Scan015
Engine vibration, compression standards, and cylinder correction methods.22th Sep 1910Box 19 \ 7  Scan016
Correcting engine batches sent out with too high compression.22th Sep 1910Box 19 \ 7  Scan017
Engine chirping issues and remedial actions taken on a 3-ring piston.19th Feb 1910Box 19 \ 7  Scan018
Power and compression test results for Chassis 1177 with specially high compression.6th Dec 1909Box 19 \ 7  Scan019
Compression test on a 1910 type standard engine using oil instead of a gauge.29th Jul 1909Box 19 \ 7  Scan020
Table showing compression test results at various engine speeds for a test engine.10th Aug 1909Box 19 \ 7  Scan021
List of compression values for various engine types and configurations.23th Jul 1920Box 19 \ 7  Scan022
Table of engine compression measurements at different speeds for chassis No. 935.23th Jul 1920Box 19 \ 7  Scan023
Modifications for Chassis 1719 (Bolton) and 1869 (Gjers) to achieve higher speeds.7th Sep 1911Box 19 \ 7  Scan024
Test results for engine explosion pressures for each of the six cylinders.5th Dec 1911Box 19 \ 7  Scan025
Comparing the weights of L-E engines versus standard engines.1st Oct 1913Box 19 \ 7  Scan026
Engine horsepower, compression ratios, and comparisons between engine 2704 and a 'Sluggard' engine.5th Mar 1914Box 19 \ 7  Scan027
Outlining design faults and suggested modifications for a specific chassis.6th Mar 1914Box 19 \ 7  Scan028
Urgent request for the clearance volume of an engine at 80 lbs. compression.14th Sep 1914Box 19 \ 7  Scan029
Note on the clearance volume of an engine with 80 lbs compression.16th Sep 1914Box 19 \ 7  Scan030
Clearance volume of an engine with 80 lbs compression.16th Sep 1914Box 19 \ 7  Scan031
Telegram from Elliott requesting a wired reply from Hives regarding a previous note on compression volume.17th Sep 1914Box 19 \ 7  Scan032
Confirmation of a telegram urging a reply to a note regarding 'compression volume'.17th Sep 1914Box 19 \ 7  Scan033
Horsepower tests with varying engine compression and carburettor setups.23th Feb 1915Box 19 \ 7  Scan034
Engine modifications involving compression, Zephyr pistons, and their effect on power and fuel consumption.23th Feb 1915Box 19 \ 7  Scan035
Graph of horsepower curves and fuel consumption differences at various engine compression levels.19th May 1915Box 19 \ 7  Scan036
Engine horsepower test to determine the effect of compression leakage on power output.19th May 1915Box 19 \ 7  Scan037
Engine performance, focusing on the effects of piston ring fitment, gas leakage, and friction on horsepower.1st May 1917Box 19 \ 7  Scan038
Page concluding that power loss from leakage is proportional to speed.4th Sep 1915Box 19 \ 7  Scan039
Engine horsepower tests, leakage, and proposed experiments on induction systems.21th May 1915Box 19 \ 7  Scan040
Possibility of 'ramming the induction' on an engine by coupling cylinders.3rd Nov 1910Box 19 \ 7  Scan041
Record of engine compression experiments conducted at various speeds on a chassis.3rd Nov 1910Box 19 \ 7  Scan042
Revisions and additions for the 'After the War Chassis', including a request for an American model.19th Sep 1917Box 19 \ 7  Scan043
List of technical recommendations regarding modifications to compression, shock absorbers, valves, wiring, and other vehicle components.19th Sep 1917Box 19 \ 7  Scan044
Updating chassis 49.GE and the proposal to build a new 'after the war' chassis model.19th Sep 1917Box 19 \ 7  Scan045
List of decisions regarding parts to be incorporated into the post-war chassis.19th Sep 1917Box 19 \ 7  Scan046
Page 2 of a numbered list detailing vehicle component specifications and modifications.9th May 1917Box 19 \ 7  Scan047
Use of aluminium pistons to increase the compression range on the 40/50 chassis.18th Feb 1919Box 19 \ 7  Scan048
Modifications to the carburetter and camshaft for the 7 CA engine.18th Feb 1919Box 19 \ 7  Scan049
Inconclusive results of comparative tests on engine horsepower, consumption, and varying compressions.13th Nov 1919Box 19 \ 7  Scan050
Peugeot and Duesenberg engine performance, focusing on compression and mean average pressure.18th May 1920Box 19 \ 7  Scan051
Engine horsepower characteristics over a range of speeds, with a comparison to Peugeot and Duesenberg.18th May 1920Box 19 \ 7  Scan052
Use of liners for chassis pistons.11th Jun 1920Box 19 \ 7  Scan053
Use of liners with pistons to achieve low compression and address engine vibrations.11th Jun 1920Box 19 \ 7  Scan054
Directive to abolish the liner used with low compression pistons and to create a new piston.16th Jun 1920Box 19 \ 7  Scan055
Use of a liner for packing between the cylinder and crankcase to modify engine compression.14th Jun 1920Box 19 \ 7  Scan056
Confirming experiments to determine relative and hill-climbing speeds of cars with high and low compression.20th Nov 1919Box 19 \ 7  Scan057
Conversion of low compression engines to medium compression for chassis.19th Jul 1921Box 19 \ 7  Scan058
Compression and axle gear ratios for the 40/50 model, distinguishing between open and closed cars.25th Jul 1922Box 19 \ 7  Scan059
Engine performance, crankshaft deflection, and the importance of reducing vehicle weight.20th Jul 1922Box 19 \ 7  Scan060
Complaints of vibrations on the 40/50 chassis and potential solutions.20th Jul 1922Box 19 \ 7  Scan061
Standardising cars with low compression and 14-tooth axles, balancing speed against vibration.25th Jul 1922Box 19 \ 7  Scan062
From B.J. to Hs. requesting clarification on engine compression values and percentage reductions.25th Jul 1922Box 19 \ 7  Scan063
From CJ to Hs. regarding the refusal to accept chassis with above-medium compression.27th Jul 1922Box 19 \ 7  Scan064
Request for a non-technical explanation of the advantages of different engine compression levels.29th Jul 1922Box 19 \ 7  Scan065
Chasing a reply to a previous query regarding engine compression.11th Aug 1922Box 19 \ 7  Scan066
Requesting results of petrol consumption tests at Brooklands for different axles and engine compressions.15th Sep 1922Box 19 \ 7  Scan067
Viability of a deeper radiator and larger fan for engine cooling, referencing conditions in Switzerland and India.9th Oct 1922Box 19 \ 7  Scan068
Cover letter forwarding a document from America regarding 'Harsh Engines'.21th Nov 1922Box 19 \ 7  Scan069
Letter from the American branch to the London office discussing high compression engine noise, ignition issues, and modifications.9th Nov 1922Box 19 \ 7  Scan070
Engine harshness, its causes in the induction system, and improvements from vaporizer pipes and compression changes.9th Nov 1922Box 19 \ 7  Scan071
Letter from an engineer concluding a discussion on the benefits of vaporizer pipes.1st Jan 1923Box 19 \ 7  Scan072
Piston design and compression ratio for the 'Hawk-Northcliffe' chassis.1st Jan 1923Box 19 \ 7  Scan073
The 5-Goshawk-11 car with Gwynne all-weather body, detailing its silent performance and discussing potential modifications.19th Jan 1923Box 19 \ 7  Scan074
Series of graphs comparing engine performance characteristics for high and low compression engines.5th Sep 1923Box 19 \ 7  Scan075
Table detailing specifications for car engines, including bore, stroke, displacement, clearance volume, and compression ratio.17th Oct 1923Box 19 \ 7  Scan076
Engine compression ratios and the effect of fuel quality in France on engine detonation.1st Feb 1924Box 19 \ 7  Scan077
Disadvantages of high compression ratios, such as detonation and vibration, and proposing double battery ignition.10th Mar 1924Box 19 \ 7  Scan078
Optimal cylinder compression capacity for the 40/50 engine, comparing Derby and Springfield practices.5th May 1924Box 19 \ 7  Scan079
Secret memo suggesting an increase in the compression ratio for the EAC engine to gain extra power.6th Oct 1924Box 19 \ 7  Scan080
Experiments with compression ratio and exhaust systems on a 20 HP engine.1st May 1926Box 19 \ 7  Scan081
Engine performance comparing different compression ratios, focusing on power output and detonation.1st May 1926Box 19 \ 7  Scan082
Testing a piston with a deep concave head to improve combustion turbulence and reduce detonation in a Phantom engine.1st May 1926Box 19 \ 7  Scan083
Power loss analysis due to various parts of the exhaust system.1st May 1926Box 19 \ 7  Scan084
Experiments with low loss manifolds and silencer systems to reduce back pressure.1st May 1926Box 19 \ 7  Scan085
Graph of power output against RPM for a 20-HP engine with various exhaust system configurations.1st May 1926Box 19 \ 7  Scan086
Graph of engine power output (B.HP) against engine speed (R.P.M.) for a 20 HP engine, comparing standard and increased compression ratios.1st May 1926Box 19 \ 7  Scan087
Blueprint for an experimental 20-HP exhaust manifold.1st May 1926Box 19 \ 7  Scan088
Modifications to the Lighter Phantom Engine, including changes to the crankcase, pistons, and connecting rods.7th Jun 1926Box 19 \ 7  Scan089
Car acceleration, comparing various models and the effect of axle and compression ratios.19th Nov 1926Box 19 \ 7  Scan090
Two acceleration graphs, one comparing a Rolls Royce Phantom to a Bentley, and the other comparing different axle ratios on a Phantom.16th Nov 1926Box 19 \ 7  Scan091
Blank document with a Print Room stamp from Derby.16th Nov 1926Box 19 \ 7  Scan092
Two graphs comparing vehicle acceleration performance, one for high vs low compression ratios and the other for the 20 HP vs 40/50 models.16th Nov 1926Box 19 \ 7  Scan093
Two graphs showing acceleration performance comparisons for standard and high compression 20 HP engines.18th Nov 1926Box 19 \ 7  Scan094
Blank page with a Print Room stamp.18th Nov 1926Box 19 \ 7  Scan095
Ricardo's latest paper on petrol engine development and its views on compression ratio and harshness.23th Feb 1927Box 19 \ 7  Scan096
Responding to Ricardo's remarks on high compression causing engine roughness and its effect on detonation.24th Feb 1927Box 19 \ 7  Scan097
Analysis of a Lorraine Dietrich engine to identify potential improvements for the 20 HP engine's power development.1st Apr 1927Box 19 \ 7  Scan098
Report page detailing comparative tests of larger diameter valves and Zenith carburettors against standard components.1st Apr 1927Box 19 \ 7  Scan099
Increased engine power with lower induction pipe depression and different carburetors.1st Apr 1927Box 19 \ 7  Scan100
Engine power increases achieved through modifications to valves and carburetters.1st Apr 1927Box 19 \ 7  Scan101
Report page comparing engine performance based on compression ratios, carburetters, valves, and ignition systems.1st Apr 1927Box 19 \ 7  Scan102
Summary of test conclusions for increasing the power of a 20 HP engine by modifying carburetors, valves, and compression ratio.1st Apr 1927Box 19 \ 7  Scan103
Proposal to test a 6/1 compression ratio on the 20 HP engine to match the specific output of the Lorraine engine.30th Mar 1927Box 19 \ 7  Scan104


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