| Description | Date | Identifier | |
| Photograph showing the state of an original crankcase after a 34-hour test at 4,000 r.p.m. | 21th Sep 1935 | Box 82 \ 4 scan0164 | |
| Photograph showing the condition of an original crankcase after a 34-hour test at 4,000 r.p.m. | 23th Sep 1935 | Box 82 \ 4 scan0165 | |
| Request for a comparison between large and small bore Bentley engine power outputs. | 23th Sep 1935 | Box 82 \ 4 scan0166 | |
| Instruction to prepare three sets of carburettors, induction systems, controls, and silencers for big bore Bentley units. | 23th Sep 1935 | Box 82 \ 4 scan0167 | |
| From Sg. to Hs. regarding the scheduling of a trial for the Large Bore Bentley due to a scheduling conflict with a Board Meeting. | 30th Sep 1935 | Box 82 \ 4 scan0168 | |
| Specification comparison for a Bentley engine with dry liner construction against standard bore engines. | 2nd Oct 1935 | Box 82 \ 4 scan0169 | |
| Request to test increasing the valve lift on a 3,500 bore Bentley engine and apply it to the latest engine type. | 5th Oct 1935 | Box 82 \ 4 scan0170 | |
| Expressing concern about fitting new Lucas wind tone horns to 20/25 and Bentley cars due to previous test failures. | 7th Oct 1935 | Box 82 \ 4 scan0171 | |
| The implementation of Wind Tone Horns for the 20/25 and Bentley models. | 8th Oct 1935 | Box 82 \ 4 scan0172 | |
| Blueprints for a new wheelcase for the Large Bore Bentley Chassis. | 8th Oct 1935 | Box 82 \ 4 scan0173 | |
| Arrangement of wiring and wing stay fastenings for a Bentley with centrally mounted wings. | 9th Oct 1935 | Box 82 \ 4 scan0174 | |
| From Sg to Hs following up on a missed opportunity to test drive a Large Bore Bentley. | 22th Oct 1935 | Box 82 \ 4 scan0175 | |
| Notice about engine detonation on a Bentley chassis caused by the ignition governor spindle being out of true. | 23th Oct 1935 | Box 82 \ 4 scan0176 | |
| The availability of a 'Large Bore Bentley' for a test run in Derby. | 25th Oct 1935 | Box 82 \ 4 scan0177 | |
| Letter discussing Bentley oil consumption issues and arranging a meeting at the Works. | 28th Oct 1935 | Box 82 \ 4 scan0178 | |
| Replying to a previous correspondence, confirming a visit by Mr. Clark to the Works. | 30th Oct 1935 | Box 82 \ 4 scan0179 | |
| From Sg. to Rm. regarding a Large Bore Bentley car. | 31th Oct 1935 | Box 82 \ 4 scan0180 | |
| The production of the Large Bore Bentley and the related delay of a Vanvooren bodied loaner car. | 1st Nov 1935 | Box 82 \ 4 scan0181 | |
| Test report on the effect of a bent shaft or worn bearing on engine timing in Bentley distributor heads. | 2nd Nov 1935 | Box 82 \ 4 scan0182 | |
| Deleting the cutout from the Bentley chassis and the resulting need for revised floorboard supports. | 4th Nov 1935 | Box 82 \ 4 scan0183 | |
| Delay and rescheduling the collection of a Large Bore Bentley. | 4th Nov 1935 | Box 82 \ 4 scan0184 | |
| Weight reduction savings on the Big Bore Chassis. | 8th Nov 1935 | Box 82 \ 4 scan0185 | |
| Specifications for machining a Large Bore Bentley engine head to achieve a 6.4/1 compression ratio. | 14th Nov 1935 | Box 82 \ 4 scan0186 | |
| Parts required for preliminary tests on a 4¼ litre Bentley (High Power) engine. | 19th Nov 1935 | Box 82 \ 4 scan0187 | |
| Request to manufacture three springs with modified coil specifications for the Bentley ignition governor. | 22th Nov 1935 | Box 82 \ 4 scan0188 | |
| Acceleration curve figures for the big bore Bentley. | 25th Nov 1935 | Box 82 \ 4 scan0189 | |
| Issue of new List of Parts and details for the Large Bore Bentley Chassis Torque Reaction Damper. | 26th Nov 1935 | Box 82 \ 4 scan0190 | |
| The Dynamo Drive & Fittings for the Large Bore Bentley Chassis. | 26th Nov 1935 | Box 82 \ 4 scan0191 | |
| Large Bore Bentley Chassis Wheelcase & Fittings, Section 5180. | 26th Nov 1935 | Box 82 \ 4 scan0192 | |
| Wire Fittings for the Large Bore Bentley Chassis, Section 5210. | 29th Nov 1935 | Box 82 \ 4 scan0193 | |
| Notification of new drawings for H.T. Wiring and Support Tubes on the Large Bore Bentley Chassis. | 5th Dec 1935 | Box 82 \ 4 scan0194 | |
| Requesting routine examination of problematic parts on Bentley endurance engines. | 7th Dec 1935 | Box 82 \ 4 scan0195 | |
| Requesting acceleration figures for a proposed big bore Bentley for production. | 7th Dec 1935 | Box 82 \ 4 scan0196 | |
| Listing new drawings for a Large Bore Bentley's Cylinder, Inlet Pipes, and Air Silencer. | 10th Dec 1935 | Box 82 \ 4 scan0197 | |
| Parts list detailing quantities and alteration notes for sections 5082 and 5050. | 10th Dec 1935 | Box 82 \ 4 scan0198 | |
| Tests of a Large Bore Bentley fitted with Large Carburetters, comparing needles, pistons, and cylinder heads. | 13th Dec 1935 | Box 82 \ 4 scan0199 | |
| Outlining tests to investigate the causes of engine detonation in Bentley cars. | 13th Dec 1935 | Box 82 \ 4 scan0200 | |
| The fitting of wind tone horns on a Bentley car. | 13th Dec 1935 | Box 82 \ 4 scan0201 | |
| Clarifying the testing status and development issues of the Big Bore Bentley and 6-B-IV engine. | 14th Dec 1935 | Box 82 \ 4 scan0202 | |
| List of specifications for the engine and chassis units. | 14th Dec 1935 | Box 82 \ 4 scan0203 | |
| Engineering changes and the status of a test vehicle with a big bore Bentley engine. | 14th Dec 1935 | Box 82 \ 4 scan0204 | |
| Unreliability of acceleration curves and standardising the 6.4/1 compression ratio. | 20th Dec 1935 | Box 82 \ 4 scan0205 | |
| Alteration of the Big Bore Bentley Head to standardize the compression ratio. | 20th Dec 1935 | Box 82 \ 4 scan0206 | |
| Requesting clarification on parts for the Big Bore Bentley that will go into production. | 18th Dec 1935 | Box 82 \ 4 scan0207 | |
| Graph of the Ignition Governor Advance Curve for Bentley Delco-Remy systems. | 18th Dec 1935 | Box 82 \ 4 scan0208 | |
| Cost reduction for a Bentley support bracket. | 19th Dec 1935 | Box 82 \ 4 scan0209 | |
| Faults found with the Delco-Remy Distributor before fitting to a B-19 unit. | 23th Dec 1935 | Box 82 \ 4 scan0210 | |
| Report page detailing issues and suggestions for a distributor's nameplate and Bakelite top. | 23th Dec 1935 | Box 82 \ 4 scan0211 | |
| Production parts and test results for the Big Bore Bentley & 6-B-IV. | 30th Dec 1935 | Box 82 \ 4 scan0212 | |
| Follow-up actions on various car components and models. | 31th Dec 1935 | Box 82 \ 4 scan0213 | |
| Progress report on various chassis, engine, and car build projects, page 2. | 31th Dec 1935 | Box 82 \ 4 scan0214 | |
| Completing composite brake drums and a boxed-in Bentley chassis design. | 31th Dec 1935 | Box 82 \ 4 scan0215 | |
| Cold starting issue with geared starter motors on 20/25 HP and Bentley models, proposing a new undercut bush as a solution. | 7th Jan 1936 | Box 82 \ 4 scan0216 | |
| Comparing the performance of a loaned Ford V-8 against a Bentley, with a note on a Cadillac. | 7th Jan 1936 | Box 82 \ 4 scan0217 | |
| Technical data sheet for a V-8 Ford engine and chassis components. | 7th Jan 1936 | Box 82 \ 4 scan0218 | |
| List of vehicle specifications including dimensions, suspension, and tyres. | 7th Jan 1936 | Box 82 \ 4 scan0219 | |
| Performance comparison between a Ford V-8, a 3.5' bore Bentley, and a Phantom III. | 7th Jan 1936 | Box 82 \ 4 scan0220 | |
| Starter motor failure due to frozen engine oil and the proposed solution of undercutting the pinion bearing surface. | 7th Jan 1936 | Box 82 \ 4 scan0221 | |
| Instructions for the dynamo drive and tachometer gears on the Large Bore 20/25 and Bentley models. | 8th Jan 1936 | Box 82 \ 4 scan0222 | |
| Outstanding modifications for the Bentley 'H' series chassis. | 9th Jan 1936 | Box 82 \ 4 scan0223 | |
| Responding to queries about the status of parts for the Bentley 'H' Series chassis. | 13th Jan 1936 | Box 82 \ 4 scan0224 | |
| Request to the Transport Department for a lorry to deliver material to Lillie Hall and collect a Bentley Radiator. | 15th Jan 1936 | Box 82 \ 4 scan0225 | |
| The dynamo drive on the 25/30 HP and Bentley models. | 17th Jan 1936 | Box 82 \ 4 scan0226 | |
| Typed memorandum regarding the maximum speed to be advertised for the Big Bore Bentley. | 17th Jan 1936 | Box 82 \ 4 scan0227 | |
| Instructional memo regarding alterations to oil and petrol pipe drawings for the Large Bore Bentley Chassis. | 17th Jan 1936 | Box 82 \ 4 scan0228 | |
| Addition of an extra fuse and accessory distribution board for Bentley headlamps. | 18th Jan 1936 | Box 82 \ 4 scan0229 | |
| Performance characteristics and axle ratios of the Big Bore Bentley. | 21th Jan 1936 | Box 82 \ 4 scan0230 | |
| Modification note regarding the mixture control lever for the 4 1/4 Litre Bentley. | 21th Jan 1936 | Box 82 \ 4 scan0231 | |
| Clarifying a printer's error in 'Motor' magazine, where a 4 1/2 litre Lagonda was misidentified as a Bentley. | 27th Jan 1936 | Box 82 \ 4 scan0232 | |
| Private memo questioning the mention of a '1936 4 1/2 litre Bentley' in 'The Motor' magazine. | 24th Jan 1936 | Box 82 \ 4 scan0233 | |
| Improvement to the oil seals for Bentley and 25 HP engines. | 29th Jan 1936 | Box 82 \ 4 scan0234 | |
| Axis of oscillation for a Bentley unit in a Terraplane type mounting, noting a surprise at the height at the gearbox end. | 29th Jan 1936 | Box 82 \ 4 scan0235 | |
| New drawings and alterations for the Large Bore Bentley Chassis crankcase and torque reaction damper. | 29th Jan 1936 | Box 82 \ 4 scan0236 | |
| Status of an experimental Big Bore Bentley, detailing why it is unsuitable for use as a demonstration car. | 30th Jan 1936 | Box 82 \ 4 scan0237 | |
| Results of over 650 hours of endurance testing on 20/25 and Bentley engines. | 31th Jan 1936 | Box 82 \ 4 scan0238 | |
| Record of failures from Bentley endurance tests, charted against hours run. | 26th Feb 1936 | Box 82 \ 4 scan0239 | |
| Endurance running, failures, and improvements to the damper flywheel for 20/25 and Bentley engines. | 3rd Feb 1936 | Box 82 \ 4 scan0240 | |
| Excess oil issue on the Bentley Large Bore engine and the recommended modifications to the valve rocker lubrication system. | 5th Feb 1936 | Box 82 \ 4 scan0241 | |
| Query regarding horsepower, revs, consumption, and axle ratios for the 4 1/4 litre Bentley. | 7th Feb 1936 | Box 82 \ 4 scan0242 | |
| Confirmation of the naming conventions for Bentley models II and III. | 7th Feb 1936 | Box 82 \ 4 scan0243 | |
| The performance, consumption and axle ratios for a 4½ litre Bentley engine. | 10th Feb 1936 | Box 82 \ 4 scan0244 | |
| Uninstructed changes to the throttle stop mechanism for the Large Bore Bentley. | 11th Feb 1936 | Box 82 \ 4 scan0245 | |
| Modified oil feed holes in the rocker shaft for the Large Bore Bentley Engine. | 11th Feb 1936 | Box 82 \ 4 scan0246 | |
| Figures, consumption, and axle ratios for a 4¼ litre Bentley. | 12th Feb 1936 | Box 82 \ 4 scan0247 | |
| Requesting the location of a photograph for reproduction in the next Bentley Bulletin. | 12th Feb 1936 | Box 82 \ 4 scan0248 | |
| Timing modifications required to fit a Delco-Remy distributor to a Bentley engine. | 17th Feb 1936 | Box 82 \ 4 scan0249 | |
| The distributor tower's positional variation, fitting requirements, and a request for drive modifications. | 17th Feb 1936 | Box 82 \ 4 scan0250 | |
| Graph of automatic advance-speed characteristics for six production Bentley distributors. | 19th Feb 1936 | Box 82 \ 4 scan0251 | |
| Comparing the performance of small and large bore engines in a 4¼ litre Bentley. | 19th Feb 1936 | Box 82 \ 4 scan0252 | |
| Power curve graph comparing the performance of 3½ Litre and 4¼ Litre engines, including acceleration figures. | 8th Feb 1936 | Box 82 \ 4 scan0253 | |
| Discrepancies in acceleration figures for 3½ and 4¼ litre Bentley models. | 21th Feb 1936 | Box 82 \ 4 scan0254 | |
| Request for clarification on performance figures for different car models, enclosing an acceleration curve for the 3 1/2 litre Bentley. | 21th Feb 1936 | Box 82 \ 4 scan0255 | |
| Short memo clarifying the location where a photograph was taken, in reply to a previous query. | 21th Feb 1936 | Box 82 \ 4 scan0256 | |
| Requesting the return of a photograph required for a bulletin. | 22th Feb 1936 | Box 82 \ 4 scan0257 | |
| Clarifying acceleration figures for a 4¼ Litre Bentley, comparing different test results. | 24th Feb 1936 | Box 82 \ 4 scan0258 | |
| Despatch instructions for a Delco-Remy Distributor sent for alteration. | 25th Feb 1936 | Box 82 \ 4 scan0259 | |
| Letter to Delco Remy & Hyatt Ltd. regarding the alteration of a Delco Distributor to improve performance. | 25th Feb 1936 | Box 82 \ 4 scan0260 | |
| Blueprint graph of the Ignition Governor Advance Curve for a Bentley Delco Remy system. | 29th Feb 1936 | Box 82 \ 4 scan0261 | |
| Seeking clarification on the correct acceleration figures for the 4.5 litre Bentley. | 25th Feb 1936 | Box 82 \ 4 scan0262 | |
| The acceptance tests and potential issues of the 4¼ Litre Bentley production model. | 25th Feb 1936 | Box 82 \ 4 scan0263 | |
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