| Description | Date | Identifier | |
| Data table showing detonation and ideal ignition advance for a silenced EB. 615 cylinder head. | 20th Mar 1936 | Box 86 \ 1 scan0192 | |
| Data table showing engine performance results for a cylinder head as part of the Bentley Development program. | 20th Mar 1936 | Box 86 \ 1 scan0193 | |
| Performance graph for a 25/30 HP 'Turbulence' cylinder head, comparing two configurations. | 3rd Apr 1936 | Box 86 \ 1 scan0194 | |
| Requesting an order of four Corrujoint 3 ply cylinder head gaskets for a Bentley. | 3rd Apr 1936 | Box 86 \ 1 scan0195 | |
| Changes to the cylinder head water circulation, specifically drilling water holes only at the rear of the engine block for the 25/30 and Bentley models. | 14th May 1936 | Box 86 \ 1 scan0196 | |
| Requesting urgent pattern alterations to a Bentley high power engine head to address overheating and pre-ignition issues. | 20th Apr 1936 | Box 86 \ 1 scan0197 | |
| To follow up on a previous order and to place a new order for specific cylinder head gaskets. | 24th Apr 1936 | Box 86 \ 1 scan0198 | |
| Instruction memo regarding modifications to induction manifolds for a High Power Bentley. | 27th Apr 1936 | Box 86 \ 1 scan0199 | |
| Design of a new exhaust valve for a Bentley unit based on previous endurance tests. | 22th May 1936 | Box 86 \ 1 scan0200 | |
| The deturbulation of a cylinder head from Bentley unit No.19. | 25th May 1936 | Box 86 \ 1 scan0201 | |
| Requesting an order for 'Corrujoint' cylinder head gaskets from a supplier in Slough. | 29th May 1936 | Box 86 \ 1 scan0202 | |
| Seat erosion on Bentley high performance cylinder heads and proposing a new casting method. | 9th Jun 1936 | Box 86 \ 1 scan0203 | |
| Requesting modifications to a Bentley (High Power) cylinder head pattern to reduce the compression ratio. | 16th Jun 1936 | Box 86 \ 1 scan0204 | |
| Graph of engine advance curves for Delco Remy governors on Bentley engines, comparing a deturbulated head with a standard head. | 2nd Jul 1936 | Box 86 \ 1 scan0205 | |
| Bentley cylinder distortion and expansion tests for 3.5 litre and 4.25 litre blocks. | 2nd Jul 1936 | Box 86 \ 1 scan0206 | |
| Page 2 of a report on the expansion and distortion of a 4¼ litre engine component. | 2nd Jul 1936 | Box 86 \ 1 scan0207 | |
| Confirming the scrapping of 3.5 Litre High Compression Head castings and the lead time for new ones. | 7th Aug 1936 | Box 86 \ 1 scan0208 | |
| Standardisation of parts document concerning plugging the front water ways in a Bentley cylinder head. | 19th Aug 1936 | Box 86 \ 1 scan0209 | |
| Estimated cost sheet for extra Jigs, Tools, and Equipment for the 20/25 HP model, introduced during the 'G' series. | 8th Jul 1936 | Box 86 \ 1 scan0210 | |
| Requesting the loan of two 25/30 or 4 1/4 litre Bentley cylinder blocks. | 5th Oct 1936 | Box 86 \ 1 scan0211 | |
| Cylinder wear results from tests in Kingsbury and anticipating further details from Paris. | 8th Oct 1936 | Box 86 \ 1 scan0212 | |
| Of thanks for further detailed information on Bentley cylinder bore wear. | 9th Oct 1936 | Box 86 \ 1 scan0213 | |
| The standardization and testing of a deturbulated Bentley cylinder head. | 29th Oct 1936 | Box 86 \ 1 scan0214 | |
| Query about conducting a test on a Bentley engine by leaving out the centre cylinder studs. | 2nd Nov 1936 | Box 86 \ 1 scan0215 | |
| The design of cylinder block EB.2561 regarding valve tappet covers and oil deflecting ribs for the 4 1/4 litre Bentley and 25/30 models. | 9th Nov 1936 | Box 86 \ 1 scan0216 | |
| Design modifications to a Bentley Cylinder Head. | 12th Nov 1936 | Box 86 \ 1 scan0217 | |
| Bentley engine test with a modified cylinder stud configuration, resulting in a blown gasket. | 16th Nov 1936 | Box 86 \ 1 scan0218 | |
| Dispatch of two KB.2929 Cylinder Blocks to the Bentley Service Station in Kingsbury. | 21th Nov 1936 | Box 86 \ 1 scan0219 | |
| Request for test results on 'Corrujoint' and 'Klinger' materials for cylinder head joint washers. | 21th Nov 1936 | Box 86 \ 1 scan0220 | |
| Corrujoint Washers as a potential replacement for C. & A. Washers. | 26th Nov 1936 | Box 86 \ 1 scan0221 | |
| Satisfactory performance and specifications of Corrujoint cylinder head gaskets compared to other types. | 26th Nov 1936 | Box 86 \ 1 scan0222 | |
| Customer complaint about a badly machined Bentley cylinder block. | 4th Dec 1936 | Box 86 \ 1 scan0223 | |
| The inspection, testing, and oil consumption of Bentley cylinder blocks. | 4th Dec 1936 | Box 86 \ 1 scan0224 | |
| Decision to use copper asbestos gaskets for the 25/30 and Bentley cylinder heads. | 14th Dec 1936 | Box 86 \ 1 scan0225 | |
| Standardisation of a scraper ring due to complaints of high oil consumption. | 27th Nov 1936 | Box 86 \ 1 scan0226 | |
| Cost estimation sheet indicating nil tool cost for an order for the 'KU' Series. | 9th Nov 1936 | Box 86 \ 1 scan0227 | |
| Cylinder bore distortion, its effect on oil consumption, and proposed grinding methods to rectify it. | 4th Jan 1936 | Box 86 \ 1 scan0228 | |
| Standardisation of parts report for a deturbulated cylinder head. | 21th Dec 1936 | Box 86 \ 1 scan0229 | |
| Production note estimating the cost of new tools for the 'L' Series chassis. | 26th Jan 1937 | Box 86 \ 1 scan0230 | |
| The material specification for a Bentley Cylinder from The Midland Cylinder Co. | 26th Jan 1937 | Box 86 \ 1 scan0231 | |
| Request to manufacture a plate for use in Bentley cylinder distortion tests. | 30th Jan 1937 | Box 86 \ 1 scan0232 | |
| Cylinder block wear on a Bentley, proposing a modification to the carburettor strangling control. | 2nd Feb 1937 | Box 86 \ 1 scan0233 | |
| Advantages and difficulties of the cylinder block design for 25/30 and Bentley models. | 5th Apr 1937 | Box 86 \ 1 scan0234 | |
| Analysis of different cylinder block design and manufacturing methods, focusing on water spaces, studs, and wet liners. | 5th Apr 1937 | Box 86 \ 1 scan0235 | |
| And recommending different engine construction options, including the Peregrine design. | 17th Apr 1937 | Box 86 \ 1 scan0236 | |
| Confirming the dispatch of a defective dynamo coupling from a 4¼-litre chassis. | 17th Apr 1937 | Box 86 \ 1 scan0237 | |
| Requesting the despatch of a Bentley crankcase and cylinder block for machining. | 30th Apr 1937 | Box 86 \ 1 scan0238 | |
| Despatch and machining of a Bentley crankcase and cylinder block. | 30th Apr 1937 | Box 86 \ 1 scan0239 | |
| Instruction to the despatch department to send a Bentley cylinder block and crankcase to Bentley Motors Ltd. for machining. | 4th May 1937 | Box 86 \ 1 scan0240 | |
| The testing of a new cylinder head and induction system for Bentley development. | 21th May 1937 | Box 86 \ 1 scan0241 | |
| Cylinder bore wear, materials like Chromidium iron, and Brinell hardness for 25/30 and Bentley cylinder blocks. | 29th May 1937 | Box 86 \ 1 scan0242 | |
| Cylinder bore wear, comparing Brinell hardness values, and considering alternative castings to improve quality. | 29th May 1937 | Box 86 \ 1 scan0243 | |
| Comparison of engine cylinder bore wear statistics for various vehicles and components. | 31th May 1937 | Box 86 \ 1 scan0244 | |
| Cylinder wear data for Midland Cylinder Co. and R.R. Cast Cylinders after 16,900 miles in France. | 31th May 1937 | Box 86 \ 1 scan0245 | |
| List of Bentley chassis fitted with replacement cylinder blocks during the month of June 1937. | 1st Jul 1937 | Box 86 \ 1 scan0246 | |
| Log sheet detailing cylinder wear measurements for various chassis in thousandths of an inch. | 1st Jun 1937 | Box 86 \ 1 scan0247 | |
| Log sheet from June 1937 detailing measurements for various vehicle chassis. | 30th Jun 1937 | Box 86 \ 1 scan0248 | |
| Simplified design of Bentley cylinder blocks to facilitate foundry work and plans for testing. | 30th Jul 1937 | Box 86 \ 1 scan0249 | |
| Modifications to a Bentley cylinder block and head with improved cores. | 5th Aug 1937 | Box 86 \ 1 scan0250 | |
| Experimental Bentley cylinder block and head castings, detailing casting defects and dimensional inaccuracies. | 31th Aug 1937 | Box 86 \ 1 scan0251 | |
| Inspection report detailing dimensional errors, weight, and defects of a cylinder block casting. | 31th Aug 1937 | Box 86 \ 1 scan0252 | |
| Design alterations and foundry issues for the Bentley Cylinder Block & Head. | 2nd Sep 1937 | Box 86 \ 1 scan0253 | |
| Bentley cylinder bore wear and oil consumption, detailing specific engine features and test results. | 28th Sep 1937 | Box 86 \ 1 scan0254 | |
| Venturi crankcase breather tests and cylinder wear measurements. | 2nd Nov 1937 | Box 86 \ 1 scan0255 | |
| Request to fit a packing plate under the cylinder block to adjust the compression ratio. | 2nd Nov 1937 | Box 86 \ 1 scan0256 | |
| Modification to the cylinder block to prevent scratching on the working face of the piston. | 14th Jun 1937 | Box 86 \ 1 scan0257 | |
| Modification proposal to introduce a radiused finish to cylinder bores to prevent scotching on working faces. | 14th Feb 1928 | Box 86 \ 1 scan0258 | |
| Blueprints for Bentley single-cylinder ramp head components, including piston and cylinder head modifications. | 3rd May 1938 | Box 86 \ 1 scan0259 | |
| Parts list and instruction memo for oil pipes and fittings on a Bentley 11 'M' Series chassis. | 14th Nov 1938 | Box 86 \ 1 scan0260 | |
| Requesting the production of oil filter support brackets for the Bentley 11 chassis. | 6th Dec 1938 | Box 86 \ 1 scan0261 | |
| Notice circulating blueprints for a 'General' Oil Filter and its fittings for the Bentley 'M' Series, 101st chassis onwards. | 8th Dec 1938 | Box 86 \ 1 scan0262 | |
| Issues with pistons, gasket leakage, and boost levels for the supercharged 'Bensport' engine. | 20th Sep 1932 | Box 86 \ 2 scan0001 | |
| Piston specifications and turbulence tests for the Bensport Engine. | 27th Feb 1933 | Box 86 \ 2 scan0002 | |
| Bensport car with piston failure at Chateauroux due to worn locking rings on the gudgeon pin. | 3rd Mar 1933 | Box 86 \ 2 scan0003 | |
| Method for locking gudgeon pins in Bensport Pistons using an aluminium plug. | 3rd Mar 1933 | Box 86 \ 2 scan0004 | |
| Blueprint detailing a modified gudgeon pin location for a 20/25 piston. | 8th Mar 1933 | Box 86 \ 2 scan0005 | |
| Use and specifications of Bensfort pistons, including dimensions and compression ratios. | 3rd Mar 1933 | Box 86 \ 2 scan0006 | |
| Required increase in diametrical load for gudgeon pin retaining rings. | 8th Mar 1933 | Box 86 \ 2 scan0007 | |
| The failure of Bensport gudgeon pin fixings after 5000 miles and the subsequent modifications tested. | 9th Mar 1933 | Box 86 \ 2 scan0008 | |
| Photographic comparison of two pistons, one of which shows a significant fracture at the gudgeon pin boss. | 9th Mar 1933 | Box 86 \ 2 scan0009 | |
| Bensport piston failure and modifications to pistons and pins for a car in France. | 9th Mar 1933 | Box 86 \ 2 scan0010 | |
| Blueprint detailing a modified gudgeon pin location for a 20/25 piston. | 8th Mar 1933 | Box 86 \ 2 scan0011 | |
| Blueprint detailing a modification to a 20/25 Piston, part number E 56610. | 8th Mar 1933 | Box 86 \ 2 scan0012 | |
| Blueprint for a Gudgeon Pin with dimensions and manufacturing instructions. | 8th Mar 1933 | Box 86 \ 2 scan0013 | |
| Blueprint for an 'End Pad - Gudgeon Pin'. | 8th Mar 1933 | Box 86 \ 2 scan0014 | |
| Proposed modifications to the Bensport piston design and production considerations. | 14th Mar 1933 | Box 86 \ 2 scan0015 | |
| Instructions regarding the fixing of gudgeon pins for the Bentley engine now being built. | 15th Mar 1933 | Box 86 \ 2 scan0016 | |
| Piston failure on a Bensport model and the proposed solution. | 20th Mar 1933 | Box 86 \ 2 scan0017 | |
| Piston failure in a Bensport car after just over 1,000 miles. | 30th Mar 1933 | Box 86 \ 2 scan0018 | |
| Analysis of Bensport piston failures, discussing material, clearance, and design issues. | 25th Mar 1933 | Box 86 \ 2 scan0019 | |
| Explaining the failure of a Bensport piston due to it being made from an unsuitable old crankcase alloy. | 27th Mar 1933 | Box 86 \ 2 scan0020 | |
| Request for tensile strength figures for a 10% zinc and 2% copper alloy following an analysis of a Bentley piston. | 27th Mar 1933 | Box 86 \ 2 scan0021 | |
| Questioning the alloy used in two failed 'Bensport' pistons. | 28th Mar 1933 | Box 86 \ 2 scan0022 | |
| Laboratory report on the ultimate stress of various aluminium alloys after heat soaking. | 28th Mar 1933 | Box 86 \ 2 scan0023 | |
| Increasing the load on a 20/25 circlip and analysing piston failures. | 28th Mar 1933 | Box 86 \ 2 scan0024 | |
| The fitting and load characteristics of wires and Bensport circlips for various engines, including the 20/25, Peregrine, and Phantom II. | 28th Mar 1933 | Box 86 \ 2 scan0025 | |
| Analysis of broken Bensport Pistons due to unsuitable material. | 29th Mar 1933 | Box 86 \ 2 scan0026 | |
| Sketch for a modified bedding on Bensport Pistons to prevent skirt failure. | 12th Apr 1933 | Box 86 \ 2 scan0027 | |
| Improved design for the Bensport Piston to address a reported failure. | 19th Apr 1933 | Box 86 \ 2 scan0028 | |
| Five modifications made to the Bensport Piston design. | 26th Apr 1933 | Box 86 \ 2 scan0029 | |
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