| Description | Date | Identifier | |
| Power curve graph comparing the India IV engine with a 5.1/1 compression ratio to a standard 20 HP production engine. | 28th Sep 1929 | Box 5a \ 5 05-page031 | |
| Comparison of engine specifications between the Lorraine-Dietrich and the 20HP R.R. models. | 30th Mar 1927 | Box 5a \ 5 05-page032 | |
| Analysis of Lorraine Dietrich engine tests for 20 HP power development experiments. | 1st Apr 1927 | Box 5a \ 5 05-page033 | |
| Comparative test report on engine modifications including larger diameter valves, different carburettors, and higher compression ratios. | 1st Apr 1927 | Box 5a \ 5 05-page034 | |
| Engine power output improvements using different carburetter configurations and induction pipe depressions. | 1st Apr 1927 | Box 5a \ 5 05-page035 | |
| Engine power increases through the use of larger valves and different carburetter configurations. | 1st Apr 1927 | Box 5a \ 5 05-page036 | |
| Report comparing engine power output, compression ratios, detonation, and ignition systems between different engines. | 1st Apr 1927 | Box 5a \ 5 05-page037 | |
| Summary and conclusions of tests to increase the power of an existing 20 HP engine, with reference to the Lorraine. | 1st Apr 1927 | Box 5a \ 5 05-page038 | |
| The proposed testing of a 6/1 compression ratio on a 20 HP engine. | 30th Mar 1927 | Box 5a \ 5 05-page039 | |
| Graph showing power increase on a 20HP engine due to lower depression in the induction pipe. | 30th Mar 1927 | Box 5a \ 5 05-page040 | |
| Performance graph comparing Brake Horse Power and Brake Mean Effective Pressure following the installation of larger valves on a 20 HP engine. | 31th Mar 1927 | Box 5a \ 5 05-page041 | |
| Graph showing the 20 HP power increase due to larger valves and lower induction pipe depression. | 31th Mar 1927 | Box 5a \ 5 05-page042 | |
| Graph showing the 20HP engine power increase due to modifications including higher compression, larger valves, and lower induction pipe depression. | 31th Mar 1927 | Box 5a \ 5 05-page043 | |
| Blueprint showing the arrangement of two Zenith carburetters on the 20 HP engine. | 31th Mar 1927 | Box 5a \ 5 05-page044 | |
| Graph plotting gas velocity past standard and large valves against engine RPM for a 20 HP engine. | 31th Mar 1927 | Box 5a \ 5 05-page045 | |
| Different valve timing for the Sports Phantom to improve high-speed output, based on a Lorraine engine comparison report. | 23th Apr 1927 | Box 5a \ 5 05-page046 | |
| Acceleration figures for the 20 HP car. | 13th May 1927 | Box 5a \ 5 05-page047 | |
| Standard top gear acceleration curve for a 1924 20 HP Touring Car. | 23th May 1927 | Box 5a \ 5 05-page048 | |
| Power development for the 20 HP engine, focusing on camshaft experiments. | 23th May 1927 | Box 5a \ 5 05-page049 | |
| Report page detailing engine performance comparisons using different camshafts and Zenith carburettors. | 31th Mar 1927 | Box 5a \ 5 05-page050 | |
| Experiment report on how high induction pipe depression reduces the performance advantage gained from long duration cams. | 31th Mar 1927 | Box 5a \ 5 05-page051 | |
| Engine performance experiments with a long duration camshaft. | 31th Mar 1927 | Box 5a \ 5 05-page052 | |
| Continued notes on engine performance modifications, test conclusions, and plans for further development on a 20 HP engine and the Phantom. | 31th Mar 1927 | Box 5a \ 5 05-page053 | |
| Performance graph for a 20HP engine showing power increase due to valve lift, compression, larger valves, and lower induction pipe depression. | 31th Mar 1927 | Box 5a \ 5 05-page054 | |
| Graph showing power increase on a 20HP engine due to a special long duration camshaft compared to a standard camshaft. | 31th Mar 1927 | Box 5a \ 5 05-page055 | |
| Graph showing a 20 HP engine power increase due to long duration valve lift when using the standard carburettor. | 11th Jul 1927 | Box 5a \ 5 05-page056 | |
| Valve lift diagram comparing a long duration camshaft to a standard camshaft. | 11th Jul 1927 | Box 5a \ 5 05-page057 | |
| Timing diagram for a 20 HP long duration camshaft, with a comparison to the standard timing. | 26th May 1922 | Box 5a \ 5 05-page058 | |
| 20 HP power development using stronger valve springs and a long duration camshaft to prevent valve bounce. | 26th May 1922 | Box 5a \ 5 05-page059 | |
| Trialing Stromberg carburettors to gather information on low depression, acceleration, and low speed performance. | 26th May 1922 | Box 5a \ 5 05-page060 | |
| Graph showing the power output of a 20HP engine with specific modifications. | 7th May 1927 | Box 5a \ 5 05-page061 | |
| Letter from 'R' about a planned meeting and two potential strategies for improving car performance and engine design. | 7th May 1927 | Box 5a \ 5 05-page062 | |
| Modifications made to a 20 HP engine to increase its power output. | 21th Sep 1927 | Box 5a \ 5 05-page063 | |
| Comparison of an experimental engine against a standard 20 HP production engine, detailing power, fuel consumption, and compression ratio effects. | 9th Sep 1927 | Box 5a \ 5 05-page064 | |
| Arrangement of exhaust and induction manifolds and timing diagram for long duration cams for an EXP Goshawk engine. | 9th Sep 1927 | Box 5a \ 5 05-page065 | |
| Strategy for increasing the power of the 20 HP car. | 30th Jan 1929 | Box 5a \ 5 05-page066 | |
| Comparative performance of the 20 HP model and the development of a new turbulent head engine. | 13th Feb 1929 | Box 5a \ 5 05-page067 | |
| Advising against requesting more power for the 20 HP engine, as a more powerful option already exists. | 3rd Apr 1928 | Box 5a \ 5 05-page068 | |
| Design and feature suggestions for a close-coupled four-seater all-weather car model. | 23th Feb 1929 | Box 5a \ 5 05-page069 | |
| Continued memo page comparing a Mercedes Benz car to the company's 18-EX model. | 14th Aug 1929 | Box 5a \ 5 05-page070 | |
| Requesting updates on a 20-HP car for a 10,000-mile test and another with a Turbulent head for a sales trial. | 14th Aug 1929 | Box 5a \ 5 05-page071 | |
| List of alterations made to a standard car, model 17-G.1V. | 25th Mar 1929 | Box 5a \ 5 05-page072 | |
| Modifications and test results for a 20 HP car, chassis 14-G4. | 28th Mar 1929 | Box 5a \ 5 05-page073 | |
| Testing and modifying the India IV engine's compression ratio to resolve pre-ignition issues. | 28th Mar 1929 | Box 5a \ 5 05-page074 | |
| Preignition issues, comparing water cooling effectiveness in aluminium and standard cast iron cylinder heads. | 28th Mar 1929 | Box 5a \ 5 05-page075 | |
| Experiments to resolve preignition issues at high compression ratios by monitoring cylinder head temperatures. | 28th Mar 1929 | Box 5a \ 5 05-page076 | |
| Comparison of performance data for two vehicles during three separate hill climb tests. | 28th Mar 1929 | Box 5a \ 5 05-page077 | |
| Blueprint comparing sketches of a standard 20 HP Cast Iron cylinder head and an India IV head. | 19th Mar 1928 | Box 5a \ 5 05-page078 | |
| The performance and characteristics of a Buick Light Six car. | 19th Mar 1928 | Box 5a \ 5 05-page079 | |
| Rubber engine mountings and a road performance comparison of a Buick and a 20 HP Sunbeam. | 19th Mar 1928 | Box 5a \ 5 05-page080 | |
| Comparison of specifications between a 20 HP Rolls Royce and a Buick sedan. | 21th Mar 1928 | Box 5a \ 5 05-page081 | |
| Data sheet listing the technical specifications and observations for a Buick Car, Type 28-27C. | 21th Mar 1928 | Box 5a \ 5 05-page082 | |
| Specifications for inner and outer valve springs, and vehicle turning circles. | 21th Mar 1928 | Box 5a \ 5 05-page083 | |
| Performance comparison of a Goshawk chassis against a Buick during various hill climb tests. | 21th Mar 1928 | Box 5a \ 5 05-page084 | |
| Design drawing for a steel cradle and rubber bush for an engine bearer arm. | 1st Mar 1928 | Box 5a \ 5 05-page085 | |
| Road performance report on a Buick car, covering steering, springing, and performance. | 1st Mar 1928 | Box 5a \ 5 05-page086 | |
| Performance comparison report between a Goshawk and a Buick vehicle, including hill climb data and engine analysis. | 1st Mar 1928 | Box 5a \ 5 05-page087 | |
| Vehicle test report detailing performance issues such as vibration, braking, and control layout. | 1st Aug 1920 | Box 5a \ 5 05-page088 | |
| Line graph comparing top gear performance (speed vs. time) of a Buick Light Six versus a 20 HP model. | 1st Aug 1920 | Box 5a \ 5 05-page089 | |
| Graph comparing the top gear acceleration of a 20 HP car against a 'Bush Light Six V'. | 19th Mar 1923 | Box 5a \ 5 05-page090 | |
| 20 HP performance, discussing the need for improvements in light of chassis weight increases, body types, and brake upgrades. | 1st Apr 1928 | Box 5a \ 5 05-page091 | |
| Increasing engine size for better performance, with a comparison to competitor models. | 27th Apr 1929 | Box 5a \ 5 05-page092 | |
| The comparative power and road performance of a 20 HP engine with an increased bore. | 27th Apr 1929 | Box 5a \ 5 05-page093 | |
| Road test performance, including acceleration and hill climbs, comparing various 20 HP models against competitors. | 27th Apr 1929 | Box 5a \ 5 05-page094 | |
| Continuation of a report comparing performance tests of 20 HP and 40/50 HP cars on Pistern Hill. | 27th Apr 1929 | Box 5a \ 5 05-page095 | |
| Comparison table of car specifications and performance data from hill climb tests. | 20th Jun 1938 | Box 5a \ 5 05-page096 | |
| New aluminium turbulent head to increase power by 30% and improve torque. | 20th Jun 1938 | Box 5a \ 5 05-page097 | |
| Letter from the US office to the UK office requesting details about a 20HP car's engine, performance, and ride quality. | 7th Aug 1928 | Box 5a \ 5 05-page098 | |
| Relationship between horsepower, weight, and acceleration, with reference to specific car models. | 15th Mar 1928 | Box 5a \ 5 05-page099 | |
| List of chassis weights for various 40/50 HP models and chassis series. | 29th Nov 1929 | Box 5a \ 5 05-page100 | |
| Performance test report on a high compression engine, detailing the effects of ignition advance. | 29th Nov 1929 | Box 5a \ 5 05-page101 | |
| Tests carried out on a 112° long duration camshaft for the 'China' engine. | 20th Dec 1929 | Box 5a \ 5 05-page102 | |
| Performance graph comparing a 112° long duration camshaft against standard and 116° camshafts. | 8th Feb 1930 | Box 5a \ 5 05-page103 | |
| Clutch slipping issues on high compression 25 HP cars due to increased torque. | 8th Feb 1930 | Box 5a \ 5 05-page104 | |
| Ignition control and timing settings for a high compression 25 HP car. | 3rd May 1930 | Box 5a \ 5 05-page105 | |
| Magneto ignition timing, its limitations, and a recommendation for the 6.25:1 engine. | 6th Feb 1930 | Box 5a \ 5 05-page106 | |
| Comparative test report on rear axle gear ratios for 25 HP high compression cars. | 7th Feb 1930 | Box 5a \ 5 05-page107 | |
| Comparison of 11/50 and 12/50 axle ratios through hill climb and road tests, with a recommendation for standard fitment. | 4th Jul 1930 | Box 5a \ 5 05-page108 | |
| Performance improvements and testing for a 20 HP long duration camshaft. | 18th Mar 1930 | Box 5a \ 5 05-page109 | |
| Torque curve data table for a 20 HP engine. | 19th Mar 1930 | Box 5a \ 5 05-page110 | |
| Ignition timing settings for the high compression 20-25 HP car. | 16th Apr 1930 | Box 5a \ 5 05-page111 | |
| Unfair comparison of long and short duration camshafts and proposing new tests. | 26th Apr 1930 | Box 5a \ 5 05-page112 | |
| Test report on the performance of a 112° long-duration camshaft, codenamed 'China'. | 26th Apr 1930 | Box 5a \ 5 05-page113 | |
| Engine performance comparing different camshafts, compression ratios, and ignition settings. | 26th Apr 1934 | Box 5a \ 5 05-page114 | |
| Performance graph comparing different camshaft and high compression configurations for an engine. | 24th Apr 1930 | Box 5a \ 5 05-page115 | |
| Performance chart comparing brake horse power and BMEP against RPM for different camshaft timings. | 1st Oct 1930 | Box 5a \ 5 05-page116 | |
| Ignition timing and control leverage alterations for high compression 21/25 HP cars. | 5th Jun 1930 | Box 5a \ 5 05-page117 | |
| Ignition timing adjustments for a 20/25 HP car with a high compression engine. | 3rd May 1930 | Box 5a \ 5 05-page118 | |
| Ignition timing for 20/25 HP high compression cars, detailing issues with detonation and comparing settings with low compression engines. | 5th May 1930 | Box 5a \ 5 05-page119 | |
| Page discussing a difficulty with the lack of automatic control on a magneto ignition system. | 5th May 1930 | Box 5a \ 5 05-page120 | |
| Recommended battery ignition setting for the high compression 20/25 HP car. | 12th May 1930 | Box 5a \ 5 05-page121 | |
| Road tests of a 112° 'China' camshaft, comparing performance against 'Standard' and 'Japan' configurations. | 19th May 1930 | Box 5a \ 5 05-page122 | |
| The effects of long duration camshafts with different types of carburetters. | 25th Jun 1930 | Box 5a \ 5 05-page123 | |
| Fifth report on car comparisons at Brooklands, focusing on cooling performance. | 25th Jun 1930 | Box 5a \ 5 05-page124 | |
| Comparison of cooling system specifications and performance against competitor vehicles like Pierce Arrow, Chrysler, and Graham Paige. | 25th Mar 1930 | Box 5a \ 5 05-page125 | |
| Performance comparison report on various car models, with notes on acceleration and a table of maximum speed test results. | 25th Jun 1930 | Box 5a \ 5 05-page126 | |
| Performance gain from a 112° camshaft and higher compression. | 25th Aug 1930 | Box 5a \ 5 05-page127 | |
| Comparative data sheet of various cars on face area, volume, and temperature metrics. | 1st Sep 1931 | Box 5a \ 5 05-page128 | |
| Blueprint with two graphs comparing vehicle acceleration figures and speedometer calibrations. | 1st Sep 1931 | Box 5a \ 5 05-page129 | |
| Comparative analysis of cooling system specifications and performance for various car models. | 24th Apr 1931 | Box 5a \ 5 05-page130 | |
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