| Description | Date | Identifier | |
| Petrol gum formation tests and recommendations for preventing and clearing gum deposits. | 1st Feb 1939 | Box 103 \ 5 scan0166 | |
| Investigation into the causes and effects of petrol gumming in fuel systems and the results of corrosion tests. | 1st Feb 1939 | Box 103 \ 5 scan0167 | |
| Petrol gumming tests, including results with an additive, and advice on preventing and cleaning gum deposits with acetone. | 1st Feb 1939 | Box 103 \ 5 scan0168 | |
| Investigation into petrol gumming, its causes, and the results of corrosion tests on fuel systems. | 1st Feb 1939 | Box 103 \ 5 scan0169 | |
| Test results on petrol gumming, its effect on needle sticking, and recommendations for prevention and cleaning. | 1st Feb 1939 | Box 103 \ 5 scan0170 | |
| Investigation into petrol gumming, its causes, corrosive effects on fuel systems, and test results. | 1st Feb 1939 | Box 103 \ 5 scan0171 | |
| Returning a Bentley carburetter body and sourcing a supply of 'Coaline' for investigation. | 21th Dec 1938 | Box 103 \ 5 scan0172 | |
| Fuel deposit issues in a carburetter from different fuel types and mixtures. | 16th Dec 1938 | Box 103 \ 5 scan0173 | |
| Investigation into the gumming up of throttles on a Phantom III, caused by petrol residue. | 16th Dec 1938 | Box 103 \ 5 scan0174 | |
| Following up on a telephone conversation regarding the acquisition of cars. | 16th Dec 1938 | Box 103 \ 5 scan0175 | |
| Issues with a new composition washer in S.U. Carburetters for the 'MR' series car. | 8th Dec 1938 | Box 103 \ 5 scan0176 | |
| Service costs and a cost-sharing agreement for Zenith carburettor modifications. | 28th Jul 1938 | Box 103 \ 5 scan0177 | |
| Revised low stress throttle return spring to address complaints of throttle sticking. | 4th May 1938 | Box 103 \ 5 scan0178 | |
| From GWH to Rm discussing issues with a Bentley, specifically a sticking throttle, brake adjustments, and misfires on a 25/30 HP engine. | 31th Mar 1938 | Box 103 \ 5 scan0179 | |
| Examination and replacement of an air silencer from a Bentley chassis B.230-GA. | 28th Mar 1938 | Box 103 \ 5 scan0180 | |
| Bad starting on a 4¼-litre car belonging to a Mr. Nicholls and arranging for its examination. | 21th Jan 1938 | Box 103 \ 5 scan0181 | |
| Investigation into starting issues on 4 1/4 Litre Bentley cars owned by Mr. G. Vandervell and his father. | 12th Jan 1938 | Box 103 \ 5 scan0182 | |
| Defective starter motor and associated battery issues due to cars being parked for long periods in winter. | 12th Jan 1938 | Box 103 \ 5 scan0183 | |
| Starting issues on 4¼-litre Bentleys and the potential use of thinner oil. | 8th Jan 1938 | Box 103 \ 5 scan0184 | |
| Ongoing issue of sticking carburetter throttles in Bentley vehicles. | 14th Feb 1938 | Box 103 \ 5 scan0185 | |
| Internal request for information on the availability of parts and the status of a design change test for a damping effect. | 25th Nov 1937 | Box 103 \ 5 scan0186 | |
| New designs for Bentley throttle springs to replace stretched standard ones. | 14th Dec 1937 | Box 103 \ 5 scan0187 | |
| Revisions to the Throttle Return Spring on a Bentley Chassis, including part replacements and modifications. | 29th Nov 1937 | Box 103 \ 5 scan0188 | |
| Enquiries into the condition of Voke's air cleaners on Bentley cars and the difficulty in obtaining a dirty one. | 1st Feb 1937 | Box 103 \ 5 scan0189 | |
| Confirming a modification to fix a sticking throttle on a 4¼ Litre Bentley carburetter. | 28th Oct 1937 | Box 103 \ 5 scan0190 | |
| Modifications to the Bentley II Chassis accelerator pedal bearing to address sticking issues. | 1st Jun 1937 | Box 103 \ 5 scan0191 | |
| Cause of throttle sticking in 4¼ Litre Bentley carburetter controls. | 21th Oct 1937 | Box 103 \ 5 scan0192 | |
| Lower stressed throttle return spring for the Bentley Chassis. | 11th Sep 1937 | Box 103 \ 5 scan0193 | |
| Throttle body distortion on 4¼-litre Bentley vehicles due to non-standard spanners and washer design at the Kingsbury Depot. | 8th Jun 1937 | Box 103 \ 5 scan0194 | |
| Blueprint of two throttle flange joints for 4¼ and 3½ litre engines. | 22th May 1937 | Box 103 \ 5 scan0195 | |
| Modification to the Bentley S.U. carburetter float chamber cover to fix a flooding issue. | 22th May 1937 | Box 103 \ 5 scan0196 | |
| Petrol leaks from the float chamber lid on a Bentley 3.5-litre S.U. carburetter. | 11th May 1937 | Box 103 \ 5 scan0197 | |
| Investigation into clutch fierceness and slipping issues with Graphite Bronze facings on the 20/25 model. | 25th May 1939 | Box 103 \ 5 scan0198 | |
| Issues with fierce 25 HP graphite bronze clutches. | 24th May 1939 | Box 103 \ 5 scan0199 | |
| Test rig for Borg & Beck thrust springs on 25/30 and 4¼ Litre Bentley clutches. | 6th Jul 1938 | Box 103 \ 5 scan0200 | |
| Clutch judder, thrust poundage, and the function of anti-rattle springs. | 6th Jul 1938 | Box 103 \ 5 scan0201 | |
| New rig designed for determining the total pressure of Borg & Beck clutches. | 28th Jun 1938 | Box 103 \ 5 scan0202 | |
| Telegram requesting urgent despatch of a torque reaction damper spring and bolts by aeroplane. | 8th Jun 1923 | Box 104 \ 1 scan0001 | |
| Vibration and rattle issues in 20 HP cars, proposing a solution using rubber engine mountings. | 29th Dec 1927 | Box 104 \ 1 scan0002 | |
| Cross-section drawing of a mechanical component, likely a valve or coupling assembly. | 28th Dec 1926 | Box 104 \ 1 scan0003 | |
| Alternative rubber block engine suspension designs for the India 3 project's 20 HP engine. | 22th Mar 1928 | Box 104 \ 1 scan0004 | |
| Attached drawings for the India 3 engine suspension. | 22th Mar 1928 | Box 104 \ 1 scan0005 | |
| Request to the Dunlop Rubber Co. for two dozen rubber engine mountings for a 20 HP engine, including a dimensioned sketch. | 3rd Apr 1928 | Box 104 \ 1 scan0006 | |
| Simplification of the India 3 engine suspension by reducing the number of joints. | 2nd Apr 1923 | Box 104 \ 1 scan0007 | |
| Brief memo attaching document Lec.2552 concerning the engine suspension for 'India 3'. | 28th Apr 1928 | Box 104 \ 1 scan0008 | |
| Over-run vibration with a lighter 20 HP flywheel, with comparative notes from a Chrysler test drive. | 3rd May 1928 | Box 104 \ 1 scan0009 | |
| Sending a new aluminium turbulent head, expected to increase power and torque. | 20th Jun 1928 | Box 104 \ 1 scan0010 | |
| Replacement of incorrect rubber engine mountings with new Avon samples for testing on a Trials car, including a dimensional drawing. | 1st Aug 1928 | Box 104 \ 1 scan0011 | |
| Request to borrow the Barkerlite Trials car GAJ.23 for experimental testing of its rubber engine mountings. | 24th Aug 1928 | Box 104 \ 1 scan0012 | |
| Clarifying car chassis numbers for an experiment on rubber engine feet. | 27th Aug 1928 | Box 104 \ 1 scan0013 | |
| Requesting a specific car for further experiments on rubber engine mountings. | 28th Aug 1928 | Box 104 \ 1 scan0014 | |
| Length tolerance for engine mounting diabolo rubbers. | 10th Sep 1928 | Box 104 \ 1 scan0015 | |
| The testing of trial car GHJ-53 with new engine rubber mountings. | 10th Sep 1928 | Box 104 \ 1 scan0016 | |
| Experimental engine feet trials on car GAJ-53 and the recommendation to fit standard parts before its sale. | 1st Sep 1928 | Box 104 \ 1 scan0017 | |
| 20 HP car regarding painting issues, window vibration, and the effects of rubber engine mountings. | 17th Sep 1928 | Box 104 \ 1 scan0018 | |
| Specification memo with a diagram for 20 HP rubber engine feet. | 27th Sep 1928 | Box 104 \ 1 scan0019 | |
| Instruction to the Stores to send two Rear Engine Feet from chassis GAJ-53. | 11th Oct 1928 | Box 104 \ 1 scan0020 | |
| Suggesting engine suspension settings using different rubber hardnesses to mitigate high-speed wobbles. | 11th Oct 1928 | Box 104 \ 1 scan0021 | |
| Requesting the preparation of a set of rubber engine mounting parts for a 20 HP chassis test. | 29th Oct 1928 | Box 104 \ 1 scan0022 | |
| Improvements to steering by modifying front engine mounting and axle design to address gyrostatic effects. | 12th Nov 1928 | Box 104 \ 1 scan0023 | |
| Engine dampers and crankshaft balance weights. | 17th Nov 1928 | Box 104 \ 1 scan0024 | |
| Comfortable riding, springs, shock dampers, and vibration reduction. | 19th Nov 1928 | Box 104 \ 1 scan0025 | |
| Letter to the Dunlop Rubber Co. regarding the testing and specifications of sample rubber blocks for an engine foot. | 4th Dec 1928 | Box 104 \ 1 scan0026 | |
| Letter discussing specifications, testing requirements, and ordering of various rubber components. | 4th Dec 1928 | Box 104 \ 1 scan0027 | |
| Graph comparing the load versus deflection for various engine foot rubbers. | 4th Dec 1928 | Box 104 \ 1 scan0028 | |
| Order of various engine rubbers from Dunlop. | 5th Dec 1928 | Box 104 \ 1 scan0029 | |
| The cause and effect of radiator shiver in 20 HP and 'SS' models. | 17th Dec 1928 | Box 104 \ 1 scan0030 | |
| Telegram received by telephone regarding suspension and radiator vibration issues. | 3rd Jan 1929 | Box 104 \ 1 scan0031 | |
| Telegram message suggesting testing procedures for engine dampers and links. | 3rd Jan 1929 | Box 104 \ 1 scan0032 | |
| Telegram form received by telephone with a handwritten message about a vehicle frame. | 4th Jan 1929 | Box 104 \ 1 scan0033 | |
| Letter responding to remarks on the 20 HP car, discussing front-end rigidity, damping, and undershields. | 4th Jan 1929 | Box 104 \ 1 scan0034 | |
| The 10,000-mile test of the 20 HP model at Chateauroux, noting spark plug and engine mounting issues. | 14th Jan 1929 | Box 104 \ 1 scan0035 | |
| Engine mounting designs to reduce frame vibration and axle tramping. | 14th Jan 1929 | Box 104 \ 1 scan0036 | |
| Continued memorandum discussing engine back plate design and fitting options. | 15th Jan 1929 | Box 104 \ 1 scan0037 | |
| Rating test results for 20 HP India engine foot rubbers, part F55840. | 15th Jan 1929 | Box 104 \ 1 scan0038 | |
| Rating test graph for engine foot rubbers, plotting load versus deflection. | 15th Jan 1929 | Box 104 \ 1 scan0039 | |
| Upcoming trials and modifications for the SS and 20 HP G.4 models. | 27th Jan 1929 | Box 104 \ 1 scan0040 | |
| Rating of the 20 HP engine mounting rubber. | 1st Jan 1929 | Box 104 \ 1 scan0041 | |
| Rating test results for 20 HP India engine foot rubbers, showing load vs. deflection. | 15th Jan 1929 | Box 104 \ 1 scan0042 | |
| Rating test graph showing load versus deflection for 20 HP India engine foot rubbers. | 15th Jan 1929 | Box 104 \ 1 scan0043 | |
| Outlining the programme to change a car's chassis from rigid to flexible. | 1st Feb 1929 | Box 104 \ 1 scan0044 | |
| Four-point engine mounting scheme for the India 1V model. | 16th Feb 1929 | Box 104 \ 1 scan0045 | |
| Letter from Dunlop Rubber Co. concerning the supply and testing of sample rubber buffer blocks for a 20 HP engine. | 20th Feb 1929 | Box 104 \ 1 scan0046 | |
| Telegram regarding engine fit tests, suggesting modifications to rubber mountings. | 25th Feb 1929 | Box 104 \ 1 scan0047 | |
| Engine mounting designs and vibration issues. | 26th Feb 1929 | Box 104 \ 1 scan0048 | |
| Letter to Dunlop Rubber Co. concerning the specifications for buffer blocks on a 20 HP model. | 28th Feb 1929 | Box 104 \ 1 scan0049 | |
| Letter to The Dunlop Rubber Co. concerning the required load rating for blocks. | 7th Mar 1929 | Box 104 \ 1 scan0050 | |
| Modifications to the G.4 engine crankcase for a 4-point mounting system. | 23th Apr 1929 | Box 104 \ 1 scan0051 | |
| Drawings for a temporary four-point suspension system for 17-G4. | 8th May 1929 | Box 104 \ 1 scan0052 | |
| Secret memo discussing development stages and issues with different 20HP car configurations, identified by codewords 'India', 'China', and 'Japan'. | 9th May 1929 | Box 104 \ 1 scan0053 | |
| Alterations to the exhaust system and an analysis of frame stiffness and periodicity. | 5th May 1929 | Box 104 \ 1 scan0054 | |
| Modifications to engine mountings to reduce frame jelly-ing and the resulting impact on engine vibration. | 5th May 1929 | Box 104 \ 1 scan0055 | |
| Secret memo detailing experiments for the 17-G4 engine suspension system, including the use of rubber shoes. | 30th May 1929 | Box 104 \ 1 scan0056 | |
| Quality issues of sheet rubber for engine mountings from a new supplier. | 20th Jun 1929 | Box 104 \ 1 scan0057 | |
| Secret memo regarding an experimental rear gearbox suspension isolated with rubber. | 13th Jul 1929 | Box 104 \ 1 scan0058 | |
| Experiment to try a new rubber mounting on the 20 HP model. | 14th Dec 1929 | Box 104 \ 1 scan0059 | |
| Rubber engine suspension for the 20 HP model and future improvements. | 16th Dec 1929 | Box 104 \ 1 scan0060 | |
| Design proposal for the 20 HP engine suspension system, comparing it to the 40/50 HP model. | 27th Dec 1929 | Box 104 \ 1 scan0061 | |
| Adjustments for the 20 HP model's rubber-mounted engine feet to account for engine lineability and frame width variations. | 4th Jan 1930 | Box 104 \ 1 scan0062 | |
| Order for 20 HP rear engine foot rubbers from The Avon Rubber Co. | 17th Jan 1930 | Box 104 \ 1 scan0063 | |
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