| Description | Date | Identifier | |
| The updated assembly specification for the B.80 No.1 Unit engine. | 12th Dec 1938 | Box 123 \ 5 scan0231 | |
| Requesting design schemes for a larger main journal crankshaft and a quieter Fabroil camwheel for B.60 & B.80 engines. | 13th Dec 1938 | Box 123 \ 5 scan0232 | |
| Engine programme and modifications for the B.60 and B.80 experimental units. | 15th Dec 1938 | Box 123 \ 5 scan0233 | |
| Specification for modifications to crankshafts, spring drives, connecting rods, pistons, and cylinder heads. | 15th Dec 1938 | Box 123 \ 5 scan0234 | |
| List of specifications for engine components including valves, push rods, camshafts, and oil pump drive. | 15th Dec 1938 | Box 123 \ 5 scan0235 | |
| Assembly and modification instructions for engine components including dynamo, induction, flywheel, and crankcase units. | 15th Dec 1938 | Box 123 \ 5 scan0236 | |
| List of specifications and modifications for various engine components, page 5. | 15th Dec 1938 | Box 123 \ 5 scan0237 | |
| Official order for various trial engine components from Vandervell Products Ltd. | 15th Dec 1938 | Box 123 \ 5 scan0238 | |
| Parts list for a Bentley 60, detailing components for the crankshaft, spring drive, and wheelcase. | 15th Dec 1938 | Box 123 \ 5 scan0239 | |
| Modifications required for a list of finished machined parts. | 15th Dec 1938 | Box 123 \ 5 scan0240 | |
| Blueprints and parts required for the Bentley 80, Spring Drive Section 5020. | 17th Dec 1938 | Box 123 \ 5 scan0241 | |
| The design of a harmonic damper, including a method for flywheel hub withdrawal and a comparison to a Vauxhall design. | 19th Dec 1938 | Box 123 \ 5 scan0242 | |
| Requesting the preparation of one flywheel and clutch assembly for an 8-cylinder B. 80-1 unit, listing the required parts. | 22th Dec 1938 | Box 123 \ 5 scan0243 | |
| Crankshaft and thrust washer parts for B.60 and B.80 engines. | 22th Dec 1938 | Box 123 \ 5 scan0244 | |
| PD.340 Full Bump Pistons and Modified Combustion Chambers for the B.60 engine. | 23th Dec 1938 | Box 123 \ 5 scan0245 | |
| Design specification for an eight-cylinder engine's cylinder head and valve gear. | 2nd Jan 1939 | Box 123 \ 5 scan0246 | |
| Request for experimental detailing and instruction for a cylinder head front end, referencing drawing E.CD.1126. | 2nd Jan 1939 | Box 123 \ 5 scan0247 | |
| Details design modifications for the C.I. Conventional 8 water pump, thermostat, and connections. | 2nd Jan 1939 | Box 123 \ 5 scan0248 | |
| Urging progress on the Dual Induction System for scheme 864. | 4th Jan 1938 | Box 123 \ 5 scan0249 | |
| The top water connections for an engine fitted in a Wraith 80 chassis. | 9th Jan 1939 | Box 123 \ 5 scan0250 | |
| Modifications to the crankcase and cylinders for the C.I. Conventional 8 engine. | 10th Jan 1939 | Box 123 \ 5 scan0251 | |
| Requesting the manufacture of parts for a B.80 unit to test for crank vibrations. | 10th Jan 1939 | Box 123 \ 5 scan0252 | |
| Request to change the diameter of B.60 exhaust valves and detail both cooled and uncooled versions. | 10th Jan 1939 | Box 123 \ 5 scan0253 | |
| Modifications to the bottom water connections, water drain tap, and radiator for the B.80 engine in a Wraith 80 chassis. | 11th Jan 1939 | Box 123 \ 5 scan0254 | |
| New blueprints for the Water Pump, Thermostat, and Connections of the Bentley C.I. Conventional Eight Engine (B.C.80). | 12th Jan 1939 | Box 123 \ 5 scan0255 | |
| Trouble with B.60 & B.80 camshafts due to a lack of an oil release hole, requesting a design modification. | 13th Jan 1939 | Box 123 \ 5 scan0256 | |
| Official order for parts to be placed with Vandervells. | 17th Jan 1939 | Box 123 \ 5 scan0257 | |
| New and replacement push rod parts for Bentley 60 and Bentley 80 models. | 19th Jan 1939 | Box 123 \ 5 scan0258 | |
| Required modifications for a B.60 unit crankshaft damper following endurance testing. | 20th Jan 1939 | Box 123 \ 5 scan0259 | |
| Wing clearances for the front wings of model 11.B.5. | 23th Jan 1939 | Box 123 \ 5 scan0260 | |
| Lubrication issue with the valve gear on B.60 and B.80 units and proposing a modification. | 23th Jan 1939 | Box 123 \ 5 scan0261 | |
| Information sheet detailing the specifications for the C.I. Conventional 6 cylinder head and crankcase. | 24th Jan 1939 | Box 123 \ 5 scan0262 | |
| Note about forthcoming information on the water connections between the engine and radiator. | 24th Jan 1939 | Box 123 \ 5 scan0263 | |
| Recurring issue with cleaning B.60 and B.80 cylinder heads prior to anodic oxidation. | 24th Jan 1939 | Box 123 \ 5 scan0264 | |
| Two modifications to the B.60 cylinder head. | 24th Jan 1939 | Box 123 \ 5 scan0265 | |
| Development of new cam forms for C.I. Conventional 6 and 8 engines. | 25th Jan 1939 | Box 123 \ 5 scan0266 | |
| Request to lay out an 8-cylinder engine on the inspection table for a weight analysis. | 26th Jan 1939 | Box 123 \ 5 scan0267 | |
| Instructions for using the Bentley 111 induction system and carburetter on the C.I. Conventional 6 engine. | 26th Jan 1939 | Box 123 \ 5 scan0268 | |
| Modifications to the water pump, fan, and water connections for the C.I. Conventional 6 engine. | 26th Jan 1939 | Box 123 \ 5 scan0269 | |
| The production and modification of engine components for the Bentley 60 chassis. | 30th Jan 1939 | Box 123 \ 5 scan0270 | |
| Crankshaft modifications for the B.80 No.4 unit due to excessive oscillation. | 31th Jan 1939 | Box 123 \ 5 scan0271 | |
| Requesting blueprints for modified cylinder head parts for a Bentley 60 Chassis to experiment with eliminating detonation. | 31th Jan 1939 | Box 123 \ 5 scan0272 | |
| Valve gear lubrication for B.60 & B.80 engines, specifically the placement of grooves in the bush. | 1st Feb 1939 | Box 123 \ 5 scan0273 | |
| Modifications to the B.60 cylinder head, avoiding the need for sodium-cooled exhaust valves. | 2nd Feb 1939 | Box 123 \ 5 scan0274 | |
| Request to manufacture inertia rings for trial on B.60 and B.80 units to address crankshaft vibrations. | 4th Feb 1939 | Box 123 \ 5 scan0275 | |
| Instructing a hold on issuing detail drawings for a Conventional C.I. 6-Cylinder unit. | 8th Feb 1939 | Box 123 \ 5 scan0276 | |
| On high power engines, discussing the test results of the B.60 engine and its departures from the existing 4-litre engine. | 9th Feb 1939 | Box 123 \ 5 scan0277 | |
| Report discussing unsolved problems regarding harmonic dampers and crank pinion spring drives on engines. | 9th Feb 1939 | Box 123 \ 5 scan0278 | |
| The development and testing of the Bentley 60 unit, detailing issues with the cylinder head and compression ratio. | 1st Feb 1939 | Box 123 \ 5 scan0279 | |
| Page 2 of a report detailing engine modifications to improve performance, including changes to the transfer throat, exhaust valves, and water passages. | 1st Feb 1939 | Box 123 \ 5 scan0280 | |
| Performance graph and analysis for a modified cylinder head with an increased throat and 6.8:1 compression ratio. | 1st Feb 1939 | Box 123 \ 5 scan0281 | |
| Graph and analysis of engine performance, focusing on Mean Effective Pressure and detonation characteristics. | 1st Feb 1939 | Box 123 \ 5 scan0282 | |
| Performance graph and analysis for raised crown pistons, showing Mean Effective Pressure and Ignition Advance against RPM. | 1st Mar 1939 | Box 123 \ 5 scan0283 | |
| Performance graph showing Mean Effective Pressure and Ignition Advance against RPM for a modified engine configuration. | 1st Feb 1939 | Box 123 \ 5 scan0284 | |
| Graph and analysis of Mean Effective Pressure and Ignition Advance against RPM for a cylinder head test. | 1st Feb 1939 | Box 123 \ 5 scan0285 | |
| Summary of conclusions from engine performance tests, focusing on detonation, combustion chamber design, and power. | 1st Feb 1939 | Box 123 \ 5 scan0286 | |
| Issues and modifications related to crankshaft dampers. | 1st Feb 1939 | Box 123 \ 5 scan0287 | |
| Crankshaft oscillation, camwheel failure, and valve gear spring development. | 1st Feb 1939 | Box 123 \ 5 scan0288 | |
| Engine component performance, comparing steel and dural rods, and camshafts. | 1st Feb 1939 | Box 123 \ 5 scan0289 | |
| Endurance testing issues with the distributor, AC petrol pump, and dynamo, with proposals for further tests. | 1st Feb 1939 | Box 123 \ 5 scan0290 | |
| List of engineering points regarding spring drive, combustion chamber, and induction systems. | 1st Feb 1939 | Box 123 \ 5 scan0291 | |
| Power curve graph comparing BV and B60 engine units. | 1st Feb 1939 | Box 123 \ 5 scan0292 | |
| Graph of a torsional oscillation test on a B.60 engine, comparing different damper configurations and a Standard Wraith. | 6th Feb 1939 | Box 123 \ 5 scan0293 | |
| Requesting a report on the idling tests for the B.60 engine. | 6th Feb 1939 | Box 123 \ 5 scan0294 | |
| Confirming a request to prepare schemes and drawings for various automotive components. | 11th Feb 1939 | Box 123 \ 5 scan0295 | |
| Requesting the urgent creation of a mould for rubber bushes (TXS.1421) for B.60 and B.80 crank oscillations. | 11th Feb 1939 | Box 123 \ 5 scan0296 | |
| Redesign of the cylinder head valve mechanism, comparing tubular and solid push rods. | 13th Feb 1939 | Box 123 \ 5 scan0297 | |
| Requesting an additional sump with special fitments for B.60 test beds. | 14th Feb 1939 | Box 123 \ 5 scan0298 | |
| Parts and drawings for adapting a Studebaker Harmonic Damper to a Bentley 80 crankshaft. | 14th Feb 1939 | Box 123 \ 5 scan0299 | |
| Listing outstanding engine development jobs with expected completion dates requested. | 14th Feb 1939 | Box 123 \ 5 scan0300 | |
| Blueprints for a Bentley 60 crankshaft damper, listing parts and quantities. | 15th Feb 1939 | Box 123 \ 5 scan0301 | |
| Machining difficulties with crankshafts made of .4 Carbon Steel for B.60 and B.80 engines. | 16th Feb 1939 | Box 123 \ 5 scan0302 | |
| Requesting the design of a B.60 Induction System adapted from a Hudson Terraplane for the Bentley 60 Unit. | 17th Feb 1939 | Box 123 \ 5 scan0303 | |
| Request for designs and detailed drawings for modifications to B.60 and B.80 engine units. | 20th Feb 1939 | Box 123 \ 5 scan0304 | |
| Requesting drawings for an induction system for the B.60 unit, adapted from a Continental Bentley V system. | 20th Feb 1939 | Box 123 \ 5 scan0305 | |
| Modifications and manufacturing instructions for the crankcase, camshaft, and tappets of the C.I. Conventional 6 engine. | 20th Feb 1939 | Box 123 \ 5 scan0306 | |
| Up-to-date programme for B.60 and B.80 units, detailing modifications to crankshafts and crankcases. | 20th Feb 1939 | Box 123 \ 5 scan0307 | |
| Requirement for cranks to have a specific type of balance weights. | 20th Feb 1939 | Box 123 \ 5 scan0308 | |
| New drawings and blueprints for the Bentley 80 water connections. | 21th Feb 1939 | Box 123 \ 5 scan0309 | |
| Design modifications when changing from cast iron to aluminium, with a summary of a conference on the subject. | 21th Feb 1939 | Box 123 \ 5 scan0310 | |
| Instructions regarding modifications to B.80 conventional engine patterns, including an alternative high-power top and expansion allowances. | 21th Feb 1939 | Box 123 \ 5 scan0311 | |
| Treatment and cleaning procedure for I/C crankcases for B.60 & B.80 engines. | 22th Feb 1939 | Box 123 \ 5 scan0312 | |
| The development of patterns for a Conventional 8 and an aluminium dry-liner straight eight engine. | 22th Feb 1939 | Box 123 \ 5 scan0313 | |
| Change in material specification for inlet valve seats on B 60 and B. 80 units. | 22th Feb 1939 | Box 123 \ 5 scan0314 | |
| Ignition governor characteristics and timing curves for various engines. | 22th Feb 1939 | Box 123 \ 5 scan0315 | |
| Proposing to adhere to an original specification regarding a B.V. characteristic. | 22th Feb 1939 | Box 123 \ 5 scan0316 | |
| Camshaft stress on the B.60 engine and investigating hairpin valve springs as a solution. | 23th Feb 1939 | Box 123 \ 5 scan0317 | |
| Development and comparison of an 8-cylinder engine against other models. | 23th Feb 1939 | Box 123 \ 5 scan0318 | |
| Up-to-date report on the Bentley B.80 8-cylinder engine, detailing issues, proposed solutions, and performance comparisons. | 23th Feb 1939 | Box 123 \ 5 scan0319 | |
| 8-cylinder engine experiment report discussing induction, detonation, exhaust systems, and valve gear. | 23th Feb 1939 | Box 123 \ 5 scan0320 | |
| Engine component issues including tappet failure, oil supply problems, and crankshaft oscillations. | 23th Feb 1939 | Box 123 \ 5 scan0321 | |
| The induction system, oil consumption, and main bearing performance. | 23th Feb 1939 | Box 123 \ 5 scan0322 | |
| List of planned future engine tests and modifications. | 23th Feb 1939 | Box 123 \ 5 scan0323 | |
| Power comparison graph for B80 and B60 engine units. | 23th Feb 1939 | Box 123 \ 5 scan0324 | |
| Required Brinell hardness and machining difficulties for crankshafts made of .4 carbon steel. | 23th Feb 1939 | Box 123 \ 5 scan0325 | |
| Summary of a strip examination on a Bentley 60 No. 1 unit after a 50-hour endurance test. | 24th Feb 1939 | Box 123 \ 5 scan0326 | |
| Inspection report detailing the condition of engine components including pistons, cylinder head, valves, and camshaft. | 24th Feb 1939 | Box 123 \ 5 scan0327 | |
| Condition report on engine components including timing gears, oil pump, distributor drive, and water pump. | 24th Feb 1939 | Box 123 \ 5 scan0328 | |
| Photograph showing two columns of main bearings from a Bentley 60 No.1 unit after an endurance test. | 24th Feb 1939 | Box 123 \ 5 scan0329 | |
| Photograph showing two rows of connecting rod bearings after a 50-hour endurance test. | 24th Feb 1939 | Box 123 \ 5 scan0330 | |
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