| Description | Date | Identifier | |
| Request to create a scheme for reducing the weight of the dropped front cross member by at least a third. | 3rd Oct 1934 | Box 3 \ 6 06-page247 | |
| Summary of modifications and additions requested for car model 3-B-IV. | 2nd Oct 1934 | Box 3 \ 6 06-page248 | |
| Extract from an owner's complaint report regarding a seized piston and scored cylinder bore. | 3rd Oct 1934 | Box 3 \ 6 06-page249 | |
| Investigation into an engine seizure on Bentley Chassis B.111-BL. | 11th Oct 1934 | Box 3 \ 6 06-page250 | |
| Experiments to resolve headlamp and wing movement on the Bentley, focusing on one-piece wings. | 11th Oct 1934 | Box 3 \ 6 06-page251 | |
| The testing of a boxed cross member and a Rover frame stabilizing bumper bar. | 11th Oct 1934 | Box 3 \ 6 06-page252 | |
| The positive effects of a stabiliser in reducing front end movement and the subsequent design of a bumper. | 11th Oct 1934 | Box 3 \ 6 06-page253 | |
| Tests to reduce headlamp and wing movement on the Bentley, and a request for a new stabiliser design. | 11th Oct 1934 | Box 3 \ 6 06-page254 | |
| Investigation into the amount of headlamp and front wing movement on a Bentley car. | 11th Oct 1934 | Box 3 \ 6 06-page255 | |
| Comparative table of frame and headlamp movement with different stabilisers and wing types. | 11th Oct 1934 | Box 3 \ 6 06-page256 | |
| Front view photograph of an experimental car with an exposed engine and unfinished bodywork. | 26th May 1934 | Box 3 \ 6 06-page257 | |
| Experimental department report on an endurance test of a Standard Bentley Unit. | 26th May 1934 | Box 3 \ 6 06-page258 | |
| 60-hour endurance test performed on a standard Bentley engine unit. | 11th Jun 1934 | Box 3 \ 6 06-page259 | |
| Bar chart comparing wing and lamp movement relative to the radiator across eight different test configurations. | 11th Jun 1934 | Box 3 \ 6 06-page260 | |
| Bar chart comparing wing and lamp movement relative to the radiator under different test configurations. | 12th Oct 1934 | Box 3 \ 6 06-page261 | |
| Response regarding a customer complaint about wings, proposing a new bumper design as a solution for Mr. Fairey's car. | 12th Oct 1934 | Box 3 \ 6 06-page262 | |
| Experiments to solve headlamp and wing movement on Bentley cars, including a new stabilising bumper bar. | 15th Oct 1934 | Box 3 \ 6 06-page263 | |
| Directive to reduce the weekly production output for 20/25 HP and Bentley models. | 17th Oct 1934 | Box 3 \ 6 06-page264 | |
| Increasing the poundage of shock absorbers on Bentley cars to reduce front-end shimmy. | 17th Oct 1934 | Box 3 \ 6 06-page265 | |
| Providing charts and photographs detailing the condition of a Bentley No.6 Unit after stripping it down for examination following extensive testing. | 18th Oct 1934 | Box 3 \ 6 06-page266 | |
| Potential solution for a Bentley's 'front end jellying' by adjusting shock absorbers. | 20th Oct 1934 | Box 3 \ 6 06-page267 | |
| The torsional vibration of a Bentley frame and the effectiveness of Harmonic Stabiliser Bumpers. | 20th Oct 1934 | Box 3 \ 6 06-page268 | |
| Bentley chassis vibration tests concerning the torsional vibration of the frame forward of the dash. | 20th Oct 1934 | Box 3 \ 6 06-page269 | |
| Stabiliser tests, comparing Wilmot and Rover models and their effects on frame frequency and vibration damping. | 20th Oct 1934 | Box 3 \ 6 06-page270 | |
| Comparison of Rover and Wilmot stabilisers, noting frequency and damping characteristics. | 20th Oct 1934 | Box 3 \ 6 06-page271 | |
| Series of graphs comparing chassis front end vibration test results under various conditions. | 7th Oct 1934 | Box 3 \ 6 06-page272 | |
| Requesting the fitting of a Floating Oil Intake to a B-4 Unit once it is removed from the test bed. | 23th Oct 1934 | Box 3 \ 6 06-page273 | |
| Type test of a Bentley engine unit, analysing main bearing wear and test results. | 24th Oct 1934 | Box 3 \ 6 06-page274 | |
| Big end bearing performance, a new crankshaft design for Bentley models, and balance weight adjustments. | 24th Oct 1934 | Box 3 \ 6 06-page275 | |
| Summary memo detailing the various test runs, rebuilds, and component changes for a B-6 unit. | 26th Oct 1934 | Box 3 \ 6 06-page276 | |
| Bentley 6-cylinder big-end bearings after endurance and general running tests. | 16th Oct 1937 | Box 3 \ 6 06-page277 | |
| Photograph of Bentley 6 main bearings after endurance and general running tests. | 16th Oct 1974 | Box 3 \ 6 06-page278 | |
| Table of measurements detailing the wear on a Bentley 6 Unit crankshaft and its bearings after endurance testing. | 16th Jun 1934 | Box 3 \ 6 06-page279 | |
| Table of measurements showing cylinder wear on a Bentley 6-unit block after endurance testing. | 6th Oct 1924 | Box 3 \ 6 06-page280 | |
| Dimensions of pistons and rings for a Bentley 6-cylinder unit after endurance and general running tests. | 16th Jun 1924 | Box 3 \ 6 06-page281 | |
| Blueprint graph showing the oil consumption of a Bentley engine during an endurance test. | 23th May 1934 | Box 3 \ 6 06-page282 | |
| Power curve graph for Unit B.6, plotting Brake Horsepower and Brake Mean Effective Pressure against RPM following a 53-hour endurance test. | 23th May 1934 | Box 3 \ 6 06-page283 | |
| The torsional vibration of a Bentley frame's front rod and the effect of harmonic stabiliser bumpers. | 24th Oct 1934 | Box 3 \ 6 06-page284 | |
| Bentley chassis vibration tests, concerning the torsional vibration of the frame forward of the dash. | 24th Oct 1934 | Box 3 \ 6 06-page285 | |
| Stabiliser tuning, issues with a Wilmot Breeden Bumper design, and tests to prevent frame deflection. | 24th Oct 1934 | Box 3 \ 6 06-page286 | |
| Request for torsion and inertia data for the latest Bentley production crankshaft for comparison with the 4-bearing shaft. | 26th Oct 1934 | Box 3 \ 6 06-page287 | |
| Comparison table of ground clearance measurements for various car models. | 29th Oct 1934 | Box 3 \ 6 06-page288 | |
| Various power loss experiments conducted on a Bentley engine. | 29th Oct 1934 | Box 3 \ 6 06-page289 | |
| The effects of air silencer and induction pipe modifications on engine performance. | 29th Oct 1934 | Box 3 \ 6 06-page290 | |
| Comparison of standard cam followers with 'R' followers, detailing effects on valve timing and power. | 1st Jun 1935 | Box 3 \ 6 06-page291 | |
| Graph showing the performance effect of varying inlet valve sizes on a Bentley engine. | 1st Jun 1935 | Box 3 \ 6 06-page292 | |
| Graph showing the effect of varying inlet valve size on engine performance for a Bentley unit with a complete air silencer fitted. | 22th Feb 1935 | Box 3 \ 6 06-page293 | |
| Graph showing the effect of different air silencer configurations on engine power output for a Bentley. | 24th May 1938 | Box 3 \ 6 06-page294 | |
| Graph plotting the effect of different intake bend configurations on engine power output for a Bentley Unit B.4. | 4th Oct 1938 | Box 3 \ 6 06-page295 | |
| Graph comparing engine power (BHP) and BMEP against RPM for standard versus small bore induction pipes on Unit B4. | 4th Jul 1935 | Box 3 \ 6 06-page296 | |
| Comparison graph of standard and 'R' type camfollowers for a Bentley engine. | 4th Jul 1935 | Box 3 \ 6 06-page297 | |
| Fitting Jackall jacks, a new body design for a Bentley, and concerns over increased weight and customer preferences. | 30th Oct 1934 | Box 3 \ 6 06-page298 | |
| Additional weight on a 4-B-IV model, luggage platforms, and proposals for a standardised Saloon. | 30th Oct 1934 | Box 3 \ 6 06-page299 | |
| The Phantom II car and the proposal for a new 12-cylinder engine. | 30th Sep 1932 | Box 4 \ 1 01-page001 | |
| Future engine specifications, including considerations for a 12-cylinder engine and a supercharger. | 30th May 1911 | Box 4 \ 1 01-page002 | |
| Body space for a long type chassis and reference to forthcoming lists of incorporated items. | 20th Sep 1932 | Box 4 \ 1 01-page003 | |
| Graph comparing power curves of Brake Horsepower at the flywheel versus Road Speed for various engine and gear configurations. | 20th Sep 1932 | Box 4 \ 1 01-page004 | |
| Performance graph comparing the power output (BHP) and BMEP of five different engine configurations against engine speed (RPM). | 1st Oct 1932 | Box 4 \ 1 01-page005 | |
| Secret memo requesting an outline for the space required by a proposed 12-cylinder V-engine, code-named 'Spectre'. | 1st Oct 1932 | Box 4 \ 1 01-page006 | |
| Design considerations for a 12-cylinder chassis, focusing on engine weight and performance. | 6th Oct 1932 | Box 4 \ 1 01-page007 | |
| Potential weight savings in lbs for various vehicle components. | 6th Oct 1932 | Box 4 \ 1 01-page008 | |
| 12-cylinder engine design, performance, and dimensional considerations including various bore sizes. | 6th Oct 1932 | Box 4 \ 1 01-page009 | |
| Page discussing the proportionality of engine dimensions, weight, and the benefits of a longer stroke. | 6th Oct 1932 | Box 4 \ 1 01-page010 | |
| Power comparison chart plotting HP and B.M.E.P. against R.P.M. for various engines. | 24th Oct 1932 | Box 4 \ 1 01-page011 | |
| Standardization of parts for the 'Spectre' and 'Bensport' engines. | 24th Oct 1932 | Box 4 \ 1 01-page012 | |
| Design considerations for the Apache engine, including tappet adjustment, connecting rods, and bearings. | 16th May 1938 | Box 4 \ 1 01-page013 | |
| Proposed design changes and advisability for the Spectre engine. | 9th May 1933 | Box 4 \ 1 01-page014 | |
| Confirming interest in an experiment to run a 12-cylinder engine on 6 cylinders on the bed. | 25th Oct 1933 | Box 4 \ 1 01-page015 | |
| Requesting the production of a mild steel model of fork and blade connecting rods for the Spectre 12 cylinder engine. | 3rd Nov 1933 | Box 4 \ 1 01-page016 | |
| Testing a 12-cylinder Kestrel Aero engine running on only 6 cylinders, with and without a flywheel. | 21th Nov 1933 | Box 4 \ 1 01-page017 | |
| Test results for 6 and 12 cylinder engines with a flywheel, noting performance periods and valve bounce. | 21th Nov 1933 | Box 4 \ 1 01-page018 | |
| Borrowing a Lincoln car for testing related to the Spectre design. | 30th Nov 1935 | Box 4 \ 1 01-page019 | |
| Forgotten 1932 questionnaire and proposing a discussion on chassis matters at the next conference. | 1st Dec 1935 | Box 4 \ 1 01-page020 | |
| Outlining design disagreements for the Spectre model, specifically the petrol tank and rear axle. | 5th Dec 1933 | Box 4 \ 1 01-page021 | |
| Test run of a 12-cylinder Lincoln car operating on only 6 cylinders, comparing smoothness and crankshaft weights. | 12th Dec 1935 | Box 4 \ 1 01-page022 | |
| Phenomena observed when running a 12-cylinder car on only 6 cylinders, including comparisons to a Lincoln engine. | 13th Dec 1933 | Box 4 \ 1 01-page023 | |
| Advantages and disadvantages of a narrow-angle V8 engine design. | 15th Dec 1933 | Box 4 \ 1 01-page024 | |
| Listing drawings being sent that are related to the 'Spectre' Engine. | 27th Jan 1934 | Box 4 \ 1 01-page025 | |
| The dispatch of drawings for the 'Spectre' Engine. | 31th Jan 1934 | Box 4 \ 1 01-page026 | |
| Listing drawings sent for the Spectre Engine, including the oil pump and crankcase. | 2nd Feb 1934 | Box 4 \ 1 01-page027 | |
| Progress report on the design of the Spectre engine, listing completed sections and their scheme numbers. | 2nd Feb 1934 | Box 4 \ 1 01-page028 | |
| Index of engine components and systems with corresponding lecture reference numbers. | 2nd Feb 1934 | Box 4 \ 1 01-page029 | |
| Progress update on the fan, drive, and wheelcase bolt spacing. | 2nd Feb 1934 | Box 4 \ 1 01-page030 | |
| Sending drawings for the Spectre engine, including modifications to the distributor and ignition governor. | 1st Feb 1934 | Box 4 \ 1 01-page031 | |
| Listing proposed engine improvements for the 'Spectre' model, based on questionnaire feedback, for discussion at a technical conference. | 9th Feb 1934 | Box 4 \ 1 01-page032 | |
| List of desired improvements and responses for brakes, steering, and rear axle systems. | 9th Feb 1934 | Box 4 \ 1 01-page033 | |
| List of vehicle feature improvements and their implementation status. | 9th Feb 1934 | Box 4 \ 1 01-page034 | |
| List of proposed design improvements and decisions for various vehicle systems. | 9th Feb 1934 | Box 4 \ 1 01-page035 | |
| Improvements related to automatic battery charge control and battery accessibility. | 16th Feb 1934 | Box 4 \ 1 01-page036 | |
| Short memo acknowledging receipt of a document regarding Spectre Ignition and arranging a future meeting. | 16th Feb 1934 | Box 4 \ 1 01-page037 | |
| Listing drawings for the Spectre Engine concerning the fan, coil fixing, and ignition wiring. | 27th Feb 1934 | Box 4 \ 1 01-page038 | |
| The implementation of silent chain drive technology on a Spectre experimental engine. | 7th Mar 1934 | Box 4 \ 1 01-page039 | |
| Dispatch of drawings for the 'Spectre' Engine, specifically for water pipes, ignition tubes, and petrol pipes. | 14th Mar 1934 | Box 4 \ 1 01-page040 | |
| Instruction to order six sets of 'long distance' parts for the Spectre for experimentation and proving. | 29th Mar 1934 | Box 4 \ 1 01-page041 | |
| Letter from The Packless Gland Co. Ltd. providing updated specifications for their No. 2 and No. 3 bellows. | 22th Feb 1934 | Box 4 \ 1 01-page042 | |
| Letter from The Packless Gland Co. Ltd. regarding adopting a standard quantity of bellows. | 19th Jan 1914 | Box 4 \ 1 01-page043 | |
| Internal note requesting information in relation to an attached letter. | 19th Jan 1914 | Box 4 \ 1 01-page044 | |
| Letter from The Packless Gland Co. Ltd. regarding the feasibility of manufacturing a thermostat unit from a drawing. | 4th Apr 1934 | Box 4 \ 1 01-page045 | |
| The concluding page of a letter from The Packless Gland Co. Ltd. | 27th Mar 1934 | Box 4 \ 1 01-page046 | |
| Technical drawing detailing the arrangement of bellows to be partially filled with ethyl alcohol. | 27th Mar 1934 | Box 4 \ 1 01-page047 | |
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