| Description | Date | Identifier | |
| Delay of car 21-G-IV due to the failure of Hall's metal bearings on a Bentley. | 21th Nov 1935 | Box 101 \ 4 scan0134 | |
| Instruction memo to fit an air cleaner, silencer, and ignition parts to a 25/29 HP engine on car 21-G-IV. | 25th Nov 1935 | Box 101 \ 4 scan0135 | |
| Modifications to the steering for chassis 21-G-IV before a 10,000 miles test. | 25th Nov 1935 | Box 101 \ 4 scan0136 | |
| Trial of cast-iron main lever bearing bushes in shock dampers instead of bronze due to wear issues. | 29th Nov 1935 | Box 101 \ 4 scan0137 | |
| Requesting to test a front roll rod Ex.20877 on car 18-G-IV. | 2nd Dec 1935 | Box 101 \ 4 scan0138 | |
| The delay in receiving a modified exhaust system for a 20/25HP Chassis 21-G-IV. | 2nd Dec 1935 | Box 101 \ 4 scan0139 | |
| Instruction memo to fit carburettor air cleaners, silencers, and ignition controls to Large Bore Bentley & 25 HP cars. | 3rd Dec 1935 | Box 101 \ 4 scan0140 | |
| Requesting the fitting of a front expansion box to an exhaust system. | 4th Dec 1935 | Box 101 \ 4 scan0141 | |
| Tests on a Stromberg carburettor, requesting the creation of drain parts for an induction pipe. | 4th Dec 1935 | Box 101 \ 4 scan0142 | |
| Requesting modifications to the fuel system of chassis 21-G-IV (Large Bore Engine). | 4th Dec 1935 | Box 101 \ 4 scan0143 | |
| Use of the 25/30 nomenclature for the 20/25 and Bentley models. | 13th Dec 1935 | Box 101 \ 4 scan0144 | |
| Progress report on car 21-G-IV, detailing recent modifications and outlining future testing plans. | 14th Dec 1935 | Box 101 \ 4 scan0145 | |
| From Sg to Hs/Rm requesting a programme of tests for car 21-G-IV. | 16th Dec 1935 | Box 101 \ 4 scan0146 | |
| Modifications to a car (21-G-IV) and outlining a proposal for its subsequent road testing. | 17th Dec 1935 | Box 101 \ 4 scan0147 | |
| Programme for the GAL-20 engine, specifically the upcoming final engine build. | 17th Dec 1935 | Box 101 \ 4 scan0148 | |
| Inefficiency of rear brake drum water excluders due to open holes and a request to block them for testing. | 17th Dec 1935 | Box 101 \ 4 scan0149 | |
| Weak Marles steering box and recommendations for strengthening it. | 20th Dec 1935 | Box 101 \ 4 scan0150 | |
| Cold start performance of the Stromberg Carburetter. | 21th Dec 1935 | Box 101 \ 4 scan0151 | |
| The results of a radiator test, detailing temperatures with shutters open versus in operation. | 21th Dec 1935 | Box 101 \ 4 scan0152 | |
| Requesting the removal of 20/25 frame tie rods from a car to reduce costs before an endurance test. | 23th Dec 1935 | Box 101 \ 4 scan0153 | |
| Confirming no reports of propellor shaft vibration for the 25/30 HP car during a 10,000-mile test. | 24th Dec 1935 | Box 101 \ 4 scan0154 | |
| Vehicle test report detailing performance and issues with various components. | 2nd Jan 1936 | Box 101 \ 4 scan0155 | |
| Issues with a wireless system during refueling and providing petrol consumption data. | 7th Jan 1936 | Box 101 \ 4 scan0156 | |
| Preliminary report on testing a new 20/25 turbulent head, Borg & Beck clutch, and Spectre steering. | 7th Jan 1936 | Box 101 \ 4 scan0157 | |
| Test run report for a Stromberg Carburetter, noting issues with rich mixture, performance, and fuel consumption. | 7th Jan 1936 | Box 101 \ 4 scan0158 | |
| Performance report on the engine, radiator, and steering systems. | 7th Jan 1936 | Box 101 \ 4 scan0159 | |
| Vehicle performance issues including steering, riding, brakes, clutch, and electrical system failures. | 7th Jan 1936 | Box 101 \ 4 scan0160 | |
| Report page detailing issues with the dynamo, fog lamp, and dipper switch. | 7th Jan 1936 | Box 101 \ 4 scan0161 | |
| The hard riding of a car's front due to distorted dampers being incorrectly bolted to the chassis frame. | 8th Jan 1936 | Box 101 \ 4 scan0162 | |
| Confirming arrangements for component 21.G.IV to undergo cold starting tests at Messrs. Lucas's cold chamber. | 10th Jan 1936 | Box 101 \ 4 scan0163 | |
| Petrol consumption, oil consumption, and mileage. | 11th Jan 1936 | Box 101 \ 4 scan0164 | |
| Confirming a conversation and instructing a modification to the calorstat spring on various models. | 14th Jan 1936 | Box 101 \ 4 scan0165 | |
| Proposal to incorporate American noise insulation practices and modify the dashboard insulation on a car with a Thrupp & Maberly body. | 17th Jan 1936 | Box 101 \ 4 scan0166 | |
| Summary memo regarding the development and testing status of the 'Big Bore 20/25' car. | 22th Jan 1936 | Box 101 \ 4 scan0167 | |
| The effects of preloading the cam on a Marles steering system, resulting in heavy steering and poor self-centering. | 6th Feb 1936 | Box 101 \ 4 scan0168 | |
| Recommending modified inlet valve springs for production after successful testing. | 7th Feb 1936 | Box 101 \ 4 scan0169 | |
| Test report on vehicle 21-G-IV detailing performance metrics and faults. | 23th Mar 1936 | Box 101 \ 4 scan0170 | |
| Disposal of a close-coupled, Hooper, four-door Saloon test car, recommending it be scrapped due to extensive testing and experimental parts. | 9th Oct 1936 | Box 101 \ 4 scan0171 | |
| Standardisation document for deleting the starter carburetter jet in the induction pipe. | 16th Jan 1931 | Box 102 \ 1 scan0001 | |
| Introduction of a new part for the 'T' Series chassis, including test date and costs. | 9th Apr 1931 | Box 102 \ 1 scan0002 | |
| Single versus double carburetter configurations for 6-cylinder engines. | 1st Feb 1931 | Box 102 \ 1 scan0003 | |
| Preliminary arrangement for the Japan 3 induction system, referencing drawing LeC. 2881. | 5th Mar 1931 | Box 102 \ 1 scan0004 | |
| Experiments to improve fuel distribution with a downdraught carburetter. | 2nd Apr 1931 | Box 102 \ 1 scan0005 | |
| Progress on double carburetters, a new pump scheme, and issues with cornering. | 9th Apr 1931 | Box 102 \ 1 scan0006 | |
| Alterations to the P.2. double carburetter to fix issues and proposing future developments. | 5th Apr 1931 | Box 102 \ 1 scan0007 | |
| Request to detail an induction pipe for a Zenith 36 D.U.P. twin-choke carburetter to be tested on a 25 HP engine. | 8th May 1931 | Box 102 \ 1 scan0008 | |
| Carburettor design choices for the 25HP 'Future Japan ls' model. | 28th May 1931 | Box 102 \ 1 scan0009 | |
| Petrol supply design for single carburetters intended for Japan. | 3rd Jun 1931 | Box 102 \ 1 scan0010 | |
| Modifications to a carburetter and induction pipe, and checking availability for fitting to a different model. | 22th Jun 1931 | Box 102 \ 1 scan0011 | |
| Request to modify a carburetter according to attached blueprints. | 23th Jun 1931 | Box 102 \ 1 scan0012 | |
| Blueprint of a modified L.S.C. Choke for the China Engine. | 31th Oct 1929 | Box 102 \ 1 scan0013 | |
| Blueprint for a Modified H.S. Choke for China. | 24th Oct 1929 | Box 102 \ 1 scan0014 | |
| Blueprint drawing of a modified suction chamber for China. | 31th Mar 1940 | Box 102 \ 1 scan0015 | |
| Design and adaptation of a carburetter from a J.2 engine to a J.3 engine. | 29th Jun 1931 | Box 102 \ 1 scan0016 | |
| Analysing the results of four different carburetter arrangements on Phantom II and 25 HP engines. | 7th Jul 1931 | Box 102 \ 1 scan0017 | |
| Engine performance, addressing M.E.P., ramming, carburation options, and issues with detonation and roughness. | 7th Jul 1931 | Box 102 \ 1 scan0018 | |
| Engine performance analysis, testing results, and future development work on different engine configurations. | 7th Jul 1931 | Box 102 \ 1 scan0019 | |
| Performance comparison graph of four different carburetor arrangements on a Phantom II engine with a 4.9 C/R aluminum head. | 8th Jul 1931 | Box 102 \ 1 scan0020 | |
| Single versus twin carburetter setups for the Phantom model, including designs for Japan. | 8th Jul 1931 | Box 102 \ 1 scan0021 | |
| Results of experiments on different carburetter positioning arrangements for a car engine. | 11th Jul 1931 | Box 102 \ 1 scan0022 | |
| Tests and comparisons of Claudel and Zenith carburettors. | 11th Jul 1931 | Box 102 \ 1 scan0023 | |
| Technical note on the performance and application of S.U. carburetters, with a comparison to Bentley's setup. | 11th Jul 1931 | Box 102 \ 1 scan0024 | |
| Performance comparison graph of different carburetter arrangements for a 25 HP engine. | 10th Jul 1931 | Box 102 \ 1 scan0025 | |
| Graph comparing the performance of various carburetor arrangements on a Phantom II 4.9 C/R engine with an aluminum head. | 13th Jul 1931 | Box 102 \ 1 scan0026 | |
| Different carburetter configurations for a 6-cylinder car. | 13th Jul 1931 | Box 102 \ 1 scan0027 | |
| Carburetter performance tests at Brooklands comparing standard and S.U. carburetters with different bonnets and jet settings. | 6th Aug 1931 | Box 102 \ 1 scan0028 | |
| Performance and petrol consumption test data for an S.U. carburetter with strong and weak mixtures. | 13th Aug 1931 | Box 102 \ 1 scan0029 | |
| Performance test data for car 12-GIV at Brooklands, comparing carburetter and bonnet configurations. | 13th Aug 1931 | Box 102 \ 1 scan0030 | |
| From 'R.' discussing the potential change of carburetters and the need for personal testing of a new S.U. specimen. | 20th Aug 1931 | Box 102 \ 1 scan0031 | |
| Outlining requirements and considerations for carburetter design and performance. | 25th Aug 1931 | Box 102 \ 1 scan0032 | |
| Heating systems and carburation for cars intended for cold climates like the USA. | 12th Sep 1931 | Box 102 \ 1 scan0033 | |
| Drawings for an induction system for the J.1 and J.3 models, covering carburetters and pipes. | 12th Sep 1931 | Box 102 \ 1 scan0034 | |
| Technical discussion on the relative merits and development of different carburetter types for car and aero work. | 28th Sep 1931 | Box 102 \ 1 scan0035 | |
| Analysis of 25 HP engine power output in relation to increasing valve lift and inlet valve clearance. | 5th Oct 1931 | Box 102 \ 1 scan0036 | |
| Performance graph comparing high and low lift rockers, showing BHP and BMEP against RPM. | 1st Jan 1940 | Box 102 \ 1 scan0037 | |
| Comparison of high and low lift rockers with twin Zenith carburettors for the Japan Unit engine. | 1st Jan 1940 | Box 102 \ 1 scan0038 | |
| Performance comparison graph of high and low lift rockers with ramming, for different valve and timing configurations. | 1st Jan 1940 | Box 102 \ 1 scan0039 | |
| Graphs showing the effect of increasing valve clearance on engine performance. | 1st Jan 1940 | Box 102 \ 1 scan0040 | |
| Graph showing the effect of increasing clearance around the inlet valve on engine performance with twin Zenith carburettors. | 1st Jan 1940 | Box 102 \ 1 scan0041 | |
| Sketch showing modifications to a Japan cylinder head to increase clearance around the inlet valves. | 2nd Oct 1931 | Box 102 \ 1 scan0042 | |
| Issuing a standardisation sheet for a spring-loaded control for the 20/25 HP starting carburetter. | 2nd Oct 1931 | Box 102 \ 1 scan0043 | |
| Request to manufacture two adaptors to test new carburettors on the existing Japan engine. | 6th Oct 1931 | Box 102 \ 1 scan0044 | |
| Proposed spring control for the 25 HP starter carburetter and a resulting issue with starting the car by hand. | 14th Oct 1931 | Box 102 \ 1 scan0045 | |
| Pros and cons of a spring control for the 25 HP starter carburetter and its potential application to the 40/50 model. | 15th Oct 1931 | Box 102 \ 1 scan0046 | |
| Standardisation of a spring loaded control for the starting carburetter. | 5th Oct 1931 | Box 102 \ 1 scan0047 | |
| Fitting of a new part to a 'J' series chassis, including tooling costs. | 13th Jan 1930 | Box 102 \ 1 scan0048 | |
| Abandoning the S.U. carburetter and developing a new single, semi-expanding carburetter. | 9th Nov 1931 | Box 102 \ 1 scan0049 | |
| Experiments with different induction pipes and carburetters to improve fuel distribution and power output. | 17th Nov 1931 | Box 102 \ 1 scan0050 | |
| Carburetter and induction pipe performance tests, with a comparison table. | 17th Nov 1931 | Box 102 \ 1 scan0051 | |
| Power output graph for a 'China Unit' engine, detailing performance with a 112° camshaft and high lift rockers. | 17th Nov 1931 | Box 102 \ 1 scan0052 | |
| Photograph showing a close-up of an engine, highlighting the carburettor and ignition system with a ruler placed for scale. | 19th Nov 1931 | Box 102 \ 1 scan0053 | |
| Carburettor design, comparing double and single carburetter setups for various engines. | 19th Nov 1931 | Box 102 \ 1 scan0054 | |
| Technical drawing of an induction pipe for a 1.875 bore S.U. carburetter. | 17th Nov 1926 | Box 102 \ 1 scan0055 | |
| Dynamometer tests to determine power lost in the carburettor air silencer and the effect of exhaust system modifications. | 23th Nov 1931 | Box 102 \ 1 scan0056 | |
| Graph showing power loss from a PII carburetter air silencer on a Standard Car - 20 EX. | 23th Nov 1931 | Box 102 \ 1 scan0057 | |
| Carburetion, concluding a single carburetter is preferable to a dual setup for a 6-cylinder engine. | 28th Nov 1931 | Box 102 \ 1 scan0058 | |
| Letter discussing the 'Japan lll' carburetter design and enclosing a blueprint for modifying the 'Phantom ll' carburetter. | 3rd Dec 1931 | Box 102 \ 1 scan0059 | |
| Fuel distribution tests comparing vertical and horizontal single jet carburettors. | 10th Dec 1931 | Box 102 \ 1 scan0060 | |
| Two photographs showing different angles of an engine. | 10th Dec 1931 | Box 102 \ 1 scan0061 | |
| Photograph of an engine carburettor and intake manifold. | 10th Dec 1931 | Box 102 \ 1 scan0062 | |
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