| Description | Date | Identifier | |
| Engine power improvements and comparing the Phantom engine with Ricardo's sleeve valve design. | 24th Apr 1931 | Box 5a \ 5 05-page131 | |
| Power loss in the 25 HP exhaust system and recommending modifications to improve performance. | 6th May 1931 | Box 5a \ 5 05-page132 | |
| Experiments for increasing the power output on the 25 HP engine. | 21th May 1931 | Box 5a \ 5 05-page133 | |
| Tests on various valve lifts and camshafts for 25 HP and 40/50 engines. | 22th May 1931 | Box 5a \ 5 05-page134 | |
| Acceleration and maximum speed tests conducted on three cars at Brooklands. | 23th Jun 1931 | Box 5a \ 5 05-page135 | |
| Results of performance and acceleration tests on various car configurations. | 23th Jun 1931 | Box 5a \ 5 05-page136 | |
| Comparative analysis of an 8-cylinder Buick's performance and characteristics. | 23th Jun 1931 | Box 5a \ 5 05-page137 | |
| Blueprint graph of Brooklands tests comparing Road Wheel Horsepower and speed for two different engine configurations. | 19th Jun 1931 | Box 5a \ 5 05-page138 | |
| Performance graph from Brooklands tests comparing clutch horsepower and B.M.E.P against engine RPM for different vehicle configurations. | 19th Jun 1931 | Box 5a \ 5 05-page139 | |
| Graph from the Brooklands tests comparing engine performance with different camshaft and carburettor setups. | 19th Jun 1931 | Box 5a \ 5 05-page140 | |
| Modifications to improve the power output of the 'China' engine, using parts proven on the 'Japan' engine. | 23th Jun 1931 | Box 5a \ 5 05-page141 | |
| Summary of bench test results on 'Japan' engines to improve power output by testing various components. | 30th Jun 1931 | Box 5a \ 5 05-page142 | |
| Graph showing BMEP variation with increased tappet clearance against RPM. | 18th Oct 1938 | Box 5a \ 5 05-page143 | |
| Power comparison graph for Engine 149.N.G.8, testing different carburettor and camshaft configurations. | 18th Oct 1938 | Box 5a \ 5 05-page144 | |
| Performance graph comparing 'JAPEN' silencer configurations on engine unit N G8. | 18th Oct 1938 | Box 5a \ 5 05-page145 | |
| Graph of exhaust back pressure curves versus R.P.M. for various silencer configurations. | 18th Oct 1938 | Box 5a \ 5 05-page146 | |
| Graph showing B.M.E.P. variation with different valve timings for engine unit NA IV GB. | 18th Oct 1938 | Box 5a \ 5 05-page147 | |
| Performance graph comparing power curves for an IVG.S engine unit under different carburettor and exhaust configurations. | 5th Aug 1931 | Box 5a \ 5 05-page148 | |
| Bench tests carried out to improve the performance of the 25 HP power unit. | 5th Aug 1931 | Box 5a \ 5 05-page149 | |
| Car performance testing, detailing propeller shaft modifications, lap speeds, and handling characteristics under various conditions. | 1st Aug 1931 | Box 5a \ 5 05-page150 | |
| Performance graph from Brooklands tests showing BHP, MEP, and induction against RPM. | 1st Aug 1931 | Box 5a \ 5 05-page151 | |
| Graph comparing the performance and back pressure of five different exhaust systems against engine RPM. | 11th Aug 1931 | Box 5a \ 5 05-page152 | |
| Brooklands performance test sheet for a close-coupled four-seater, comparing different carburettor and engine power configurations. | 14th Aug 1931 | Box 5a \ 5 05-page153 | |
| Results of acceleration and hill climbing tests on a 25 HP car. | 19th Aug 1931 | Box 5a \ 5 05-page154 | |
| Low speed performance and acceleration test results for a close-coupled tourer comparing different carburettor and silencer units. | 15th Aug 1931 | Box 5a \ 5 05-page155 | |
| Power output tests for the 'Japan' engine, detailing findings on carburettors, induction, and valve timing. | 24th Sep 1931 | Box 5a \ 5 05-page156 | |
| Tests on induction pipes, carburettors, and valve clearances. | 24th Sep 1931 | Box 5a \ 5 05-page157 | |
| Blueprint graph showing the effect of increasing induction on engine performance with twin carburettors. | 24th Sep 1931 | Box 5a \ 5 05-page158 | |
| Performance graph and specifications for the 'Japan Unit' engine. | 18th Sep 1931 | Box 5a \ 5 05-page159 | |
| Performance comparison graph of four different carburettor arrangements. | 18th Sep 1931 | Box 5a \ 5 05-page160 | |
| Performance comparison graph of three different carburettor configurations, plotting B.HP and B.M.E.P. against engine R.P.M. | 19th Aug 1933 | Box 5a \ 5 05-page161 | |
| Graph comparing two timing alterations on a 112° camshaft with two Claudel carburettors. | 23th Sep 1931 | Box 5a \ 5 05-page162 | |
| Performance graph comparing induction pipe capacities for a 'Japan Unit' engine. | 23th Sep 1931 | Box 5a \ 5 05-page163 | |
| Graph comparing the performance curves of single and double Claudel carburetor setups. | 23th Sep 1931 | Box 5a \ 5 05-page164 | |
| Photograph showing a side view of an inline-six engine installed in a chassis. | 23th Sep 1931 | Box 5a \ 5 05-page165 | |
| Montage of photographs displaying various engine carburetor and manifold configurations. | 1st Oct 1931 | Box 5a \ 5 05-page166 | |
| Correcting details in a power output report for Japan. | 1st Oct 1931 | Box 5a \ 5 05-page167 | |
| Analysis of 25 HP engine power output concerning increased valve lift and clearance around the inlet valve. | 1st Oct 1931 | Box 5a \ 5 05-page168 | |
| Performance graph comparing high and low lift rockers on a Japan Unit engine. | 1st Oct 1931 | Box 5a \ 5 05-page169 | |
| Graphical comparison of performance for high and low lift rockers with twin zenith carburettors. | 1st Oct 1931 | Box 5a \ 5 05-page170 | |
| Performance comparison of high and low lift rockers with ramming, showing BHP vs RPM curves and valve timing diagrams. | 1st Oct 1931 | Box 5a \ 5 05-page171 | |
| Performance graph showing the effect of increasing clearance around the inlet valve tappet. | 1st Oct 1931 | Box 5a \ 5 05-page172 | |
| Blueprint graph showing the effect of increasing clearance around the inlet valve on engine performance. | 1st Oct 1937 | Box 5a \ 5 05-page173 | |
| Sketch showing modifications to a Japan cylinder head to give increased clearance around inlet valves. | 1st Oct 1937 | Box 5a \ 5 05-page174 | |
| Engine power output tests for the 10,000-mile car, detailing modifications to the camshaft, pistons, and exhaust system. | 27th Oct 1931 | Box 5a \ 5 05-page175 | |
| Performance graph comparing the C.I. and C.XI engine units over a range of RPMs. | 25th Oct 1931 | Box 5a \ 5 05-page176 | |
| Power curves for a unit after a 10,000 mile test, comparing five different exhaust system configurations. | 25th Oct 1931 | Box 5a \ 5 05-page177 | |
| Experiments with intake pipe and carburetter designs to improve fuel distribution and power output for the J.1 engine. | 17th Nov 1931 | Box 5a \ 5 05-page178 | |
| Report comparing carburetter performance with different pipe configurations and engine types, including M.E.P. data. | 17th Nov 1931 | Box 5a \ 5 05-page179 | |
| Power output graph for the 'China Unit' engine, showing performance with different carburettor and valve configurations. | 17th Nov 1931 | Box 5a \ 5 05-page180 | |
| Blueprint for an induction pipe for a 1.875 bore S.U. carburettor, with notes on fittings and finish. | 17th Nov 1931 | Box 5a \ 5 05-page182 | |
| Dynamometer test results for the 20-EX model, investigating power loss from the carburetter air silencer and various exhaust system modifications. | 23th Nov 1931 | Box 5a \ 5 05-page183 | |
| Graph showing power loss for a PH carburetter air silencer on a Standard Car - 20 EX. | 23th Nov 1931 | Box 5a \ 5 05-page184 | |
| Engine performance test report for the Derby 30 HP car, analysing power curves with different configurations. | 10th Dec 1931 | Box 5a \ 5 05-page185 | |
| Performance graphs for a CXII High Lift Unit showing power output and compression with various manifold and silencer setups. | 4th Dec 1931 | Box 5a \ 5 05-page186 | |
| Power output and compression pressure curves for a Ctr. Unit China engine with varying exhaust systems. | 4th Dec 1931 | Box 5a \ 5 05-page187 | |
| Blueprint graph of engine performance showing power output, BMEP, and compression pressure against RPM. | 8th Dec 1931 | Box 5a \ 5 05-page188 | |
| Performance graph comparing two engine configurations, showing power output and mean effective pressure versus RPM. | 8th Dec 1931 | Box 5a \ 5 05-page189 | |
| On the readiness of dual carburetters for fitting to a 15-S-IV and testing on a Japan I unit. | 14th Dec 1931 | Box 5a \ 5 05-page190 | |
| Blueprint graph of engine power output and valve timing for a Japan Unit with R.R. Carbs. | 12th Dec 1931 | Box 5a \ 5 05-page191 | |
| Requesting the replacement of a blueprint due to an error in its title. | 14th Dec 1931 | Box 5a \ 5 05-page192 | |
| Blueprint graph of power output against R.P.M. for a 'Japan Unit' with specified engine configurations. | 14th Dec 1931 | Box 5a \ 5 05-page193 | |
| Performance graph comparing horsepower (HP) against RPM for various engine configurations. | 24th Dec 1931 | Box 5a \ 5 05-page194 | |
| Engine development and power improvement experiments for the Bentley 20-2-4. | 24th Dec 1931 | Box 5a \ 5 05-page195 | |
| Performance analysis memo detailing brake horsepower figures and discussing Brooklands lap times. | 24th Dec 1931 | Box 5a \ 5 05-page196 | |
| Performance graph comparing standard, 50% larger, and 100% larger chokes on a China O/C Unit. | 22th Dec 1931 | Box 5a \ 5 05-page197 | |
| Carburetter tests for the 20/25 HP model, comparing an experimental S.U. carburetter with the standard version. | 13th Nov 1933 | Box 5a \ 5 05-page198 | |
| Graph of acceleration curves comparing the Phantom I, Silver Ghost, and 20 HP models. | 15th Aug 1928 | Box 5a \ 5 05-page199 | |
| Performance graph for the 20 HP flywheel clutch, including chassis weight specifications for various configurations. | 15th Aug 1928 | Box 5a \ 5 05-page200 | |
| Comparative horsepower curve graph for the Silver Ghost and Phantom models. | 8th Aug 1928 | Box 5a \ 5 05-page201 | |
| Fitting of an aluminium head to a 20 HP engine, its effect on power, carburetter limitations and compression ratios. | 8th Aug 1928 | Box 5a \ 5 05-page202 | |
| Cover note sending required curves in response to a previous reference. | 30th Aug 1928 | Box 5a \ 5 05-page203 | |
| Slow running issues on the 20 HP engine and a proposed test of a Zenith carburetter. | 1st Aug 1928 | Box 5a \ 5 05-page204 | |
| Telephone message discussing the disappointing lack of expected engine performance improvements on a 20 HP model. | 25th Apr 1929 | Box 5a \ 5 05-page205 | |
| Five performance improvements for the 20 HP car, focusing on engine and exhaust modifications. | 11th Oct 1929 | Box 5a \ 5 05-page206 | |
| Declining sales of the 20 HP Chassis and suggesting potential improvements or its discontinuation. | 17th Oct 1929 | Box 5a \ 5 05-page207 | |
| Engine power improvements and standardising cutouts on 20HP models. | 17th Oct 1929 | Box 5a \ 5 05-page208 | |
| Adoption of improvements to parts under the bonnet. | 29th Oct 1929 | Box 5a \ 5 05-page209 | |
| Proposal to supercharge the 'Twenty' model car. | 29th Oct 1929 | Box 5a \ 5 05-page210 | |
| Experiments to increase the power output of the 'China' engine. | 29th Oct 1929 | Box 5a \ 5 05-page211 | |
| List of six modifications made to an engine to increase power, detailing changes to components like compression ratio, valves, and camshaft. | 29th Oct 1929 | Box 5a \ 5 05-page212 | |
| The promising results of modifications and tests on a large core engine. | 29th Oct 1928 | Box 5a \ 5 05-page213 | |
| Performance graph showing increased power output for the 'China Engine' with various engine specifications and valve timings. | 29th Oct 1928 | Box 5a \ 5 05-page214 | |
| Experiments and modifications made to increase the power output of the 'China' engine. | 11th Aug 1923 | Box 5a \ 5 05-page215 | |
| Comparison of engine performance with different carburettor, induction, and valve configurations. | 1st Nov 1922 | Box 5a \ 5 05-page216 | |
| Analysis comparing engine performance curves based on variations in camshafts, valves, and compression ratios. | 1st Nov 1929 | Box 5a \ 5 05-page217 | |
| Engine modifications to achieve 75 B.HP and the results of exhaust system tests. | 1st Nov 1922 | Box 5a \ 5 05-page218 | |
| Testing an experimental exhaust manifold, comparing engine power curves and planning future modifications. | 1st Nov 1929 | Box 5a \ 5 05-page219 | |
| Power increase modifications for the 25 HP 'China' engine, focusing on timing, valve sizes, and materials for the Phantom II. | 4th Nov 1929 | Box 5a \ 5 05-page220 | |
| Communication detailing modifications to engine components including the cylinder head, coreboxes, camshaft, and valve springs. | 4th Nov 1929 | Box 5a \ 5 05-page221 | |
| Test report comparing the power output and detonation characteristics of 116° and 110° camshafts on the 'China' engine. | 11th Nov 1929 | Box 5a \ 5 05-page222 | |
| Camshaft and compression ratio testing, and the preparation of a large bore turbulent head engine for power curve analysis. | 29th Nov 1929 | Box 5a \ 5 05-page223 | |
| Blueprint graph comparing engine power curves resulting from different camshaft timings and specifications. | 4th Nov 1927 | Box 5a \ 5 05-page224 | |
| Comparison of the power output between 'Japan' and 'China' type engines. | 1st Nov 1929 | Box 5a \ 5 05-page225 | |
| Performance analysis of a Japanese engine, detailing modifications to the induction pipe and comparison of detonation issues. | 1st Nov 1924 | Box 5a \ 5 05-page226 | |
| Performance comparison graph of the 'Japan' and 'China' engines, plotting Brake Horse Power and B.M.E.P. against R.P.M. | 6th Nov 1929 | Box 5a \ 5 05-page227 | |
| Comparison of a 116° camshaft against a standard 110° camshaft on a Standard China Engine. | 12th Nov 1929 | Box 5a \ 5 05-page228 | |
| Recommendation to use the standard camshaft over the 116° version under specific suboptimal conditions. | 2nd Nov 1929 | Box 5a \ 5 05-page229 | |
| Performance comparison graph for 110° and 116° camshafts in a standard 'Chuk' engine, detailing valve timings. | 12th Nov 1929 | Box 5a \ 5 05-page230 | |
| Testing long duration cams and increased tappet clearance on a 25HP 'CHINA' engine to improve high-speed power. | 16th Nov 1929 | Box 5a \ 5 05-page231 | |
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