| Description | Date | Identifier | |
| Requesting details for an experiment on chromium plating cylinder bores for Griffon engines. | 20th Feb 1940 | Box 132 \ 4 scan0235 | |
| Short memo discussing the lab report on chromium plating of cylinder bores. | 22th Feb 1940 | Box 132 \ 4 scan0236 | |
| The method for chromium plating car cylinder bores on a 6-cylinder Bentley block. | 16th Oct 1939 | Box 132 \ 4 scan0237 | |
| Procedure for plating, including solution parameters and post-treatment instructions. | 16th Oct 1939 | Box 132 \ 4 scan0238 | |
| The method for chromium plating car cylinder bores for a 6-cylinder Bentley block. | 16th Oct 1939 | Box 132 \ 4 scan0239 | |
| Request to send an official order for a Morris cylinder head gasket which has already been supplied. | 21th Feb 1940 | Box 132 \ 4 scan0240 | |
| Design modifications and investigations for a sheet metal rocker cover and cylinder head. | 21th Feb 1940 | Box 132 \ 4 scan0241 | |
| Confirming a telephone request for cylinder bore measurements and speedometer reading for Chassis 28.G.V1. | 7th Mar 1940 | Box 132 \ 4 scan0242 | |
| To Aspley (Lab) regarding arrangements for a visit to Leyland's to observe their chromium plating process and a request to plate short liners. | 14th Mar 1940 | Box 132 \ 4 scan0243 | |
| Request for the average cost of re-boring pistons and cylinder bore durability data for small cars. | 14th Mar 1940 | Box 132 \ 4 scan0244 | |
| Requesting parts for chassis number 28-G-Vl based on a cylinder report. | 15th Mar 1940 | Box 132 \ 4 scan0245 | |
| Wear measurements for engine bores and pistons. | 14th Mar 1940 | Box 132 \ 4 scan0246 | |
| Engine bore wear, re-boring intervals, and the potential benefits of using chrome plate or longer inserts. | 16th Mar 1940 | Box 132 \ 4 scan0247 | |
| Alteration note correcting two dimensions on a cylinder head joint washer due to a drawing office error. | 24th Apr 1940 | Box 132 \ 4 scan0248 | |
| Patent search on the chromium plating of cylinder bores. | 1st May 1940 | Box 132 \ 4 scan0249 | |
| Request for information regarding an innisation test rig for single cylinder test beds. | 9th May 1940 | Box 132 \ 4 scan0250 | |
| Advantages and disadvantages of a new type of high power cylinder head. | 9th Sep 1940 | Box 132 \ 4 scan0251 | |
| Advantages and disadvantages of two different high-power cylinder head designs. | 9th Sep 1940 | Box 132 \ 4 scan0252 | |
| Modifications to improve engine idling on the high power head. | 27th Oct 1940 | Box 132 \ 4 scan0253 | |
| From the Laboratory requesting photographs of the deepest worn portions of a non-plated chassis cylinder block. | 22th Oct 1940 | Box 132 \ 4 scan0254 | |
| Conclusions on two types of high power cylinder heads for 4-cylinder and 6-cylinder engines. | 9th Sep 1940 | Box 132 \ 4 scan0255 | |
| Measurement of cylinder bore readings for chassis No. 25-G-V1. | 5th Dec 1940 | Box 132 \ 4 scan0256 | |
| Requesting a camshaft with cam forms suitable for hydraulic tappets for an 8-cylinder aluminium engine. | 23th Feb 1941 | Box 132 \ 4 scan0257 | |
| Particulars of a cylinder block fitted to a Wraith III service car, including bore wear and mileage records. | 2nd Jun 1941 | Box 132 \ 4 scan0258 | |
| New 75 m/m cylinder head design, its compression ratio, and a potential valve clearance issue. | 7th Jul 1941 | Box 132 \ 4 scan0259 | |
| Rate of cylinder wear on small bore engines. | 3rd Feb 1944 | Box 132 \ 4 scan0260 | |
| Analysis of engine big end failure and cylinder lubrication issues. | 3rd Feb 1944 | Box 132 \ 4 scan0261 | |
| Cylinder wear issues related to Aerolite pistons and potential resolutions. | 3rd Feb 1944 | Box 132 \ 4 scan0262 | |
| Requesting a report on the execution and cost of a process. | 30th Sep 1938 | Box 132 \ 5 scan0001 | |
| Advertisement for BRICO Cylinder Inserts featured in 1939 'Standard' cars, from 'The Autocar' magazine. | 30th Sep 1938 | Box 132 \ 5 scan0002 | |
| Advertisement from 'The Autocar' magazine for Duckham's ADCOIDISATION and ADCOIDS lubrication products. | 30th Sep 1938 | Box 132 \ 5 scan0003 | |
| Letter to The British Piston Ring Co. Ltd. requesting information on 'Brico' cylinder inserts. | 4th Oct 1938 | Box 132 \ 5 scan0004 | |
| Letter from The British Piston Ring Co Ltd concerning short cylinder inserts and a proposed meeting. | 5th Oct 1938 | Box 132 \ 5 scan0005 | |
| Letter from The British Piston Ring Co Ltd confirming a representative's visit and proposals for Bentley engine cylinder block inserts. | 10th Oct 1938 | Box 132 \ 5 scan0006 | |
| Advantages and material specifications of Brico cylinder inserts for 4 1/4 litre engines. | 11th Oct 1938 | Box 132 \ 5 scan0007 | |
| Report discussing cylinder liner dimensions, piston bore observations, and comparative wear figures for Bentley engines. | 11th Oct 1938 | Box 132 \ 5 scan0008 | |
| Letter to The British Piston Ring Co. Ltd. requesting a pamphlet on piston ring design. | 13th Oct 1938 | Box 132 \ 5 scan0009 | |
| Cover note attaching copies of BL.2213 to a report on 'BRICO' valve seat insert tests. | 14th Oct 1938 | Box 132 \ 5 scan0010 | |
| Chart of diametral interferences for valve guides and valve inserts on a Bentley 60 No. 1 unit. | 13th Oct 1938 | Box 132 \ 5 scan0011 | |
| Letter from The British Piston Ring Co Ltd sending cylinder wear data for short cylinder inserts. | 20th Oct 1938 | Box 132 \ 5 scan0012 | |
| Letter to The British Piston Ring Co. Ltd. enclosing drawings of piston rings for comment. | 22th Oct 1938 | Box 132 \ 5 scan0013 | |
| Letter from The British Piston Ring Co Ltd regarding blueprints for piston rings Part Nos. EB.3122 and E.60820. | 26th Oct 1938 | Box 132 \ 5 scan0014 | |
| Internal request to order 24 short cylinder inserts from The British Piston Ring Co. Ltd. | 27th Oct 1938 | Box 132 \ 5 scan0015 | |
| Letter to The British Piston Ring Co. Ltd. regarding a drawing revision for Bentley engine inserts and a new order. | 27th Oct 1938 | Box 132 \ 5 scan0016 | |
| Letter from The British Piston Ring Co Ltd confirming a conversation about Short Cylinder Inserts and a quotation. | 29th Oct 1938 | Box 132 \ 5 scan0017 | |
| Letter to The British Piston Ring Co. Ltd. apologising for an error on a tracing and enclosing a corrected version. | 31th Oct 1938 | Box 132 \ 5 scan0018 | |
| Letter from a supplier regarding corrected tracings, piston ring drawings, and an order for cylinder inserts. | 1st Nov 1938 | Box 132 \ 5 scan0019 | |
| Instructions for machining cylinder blocks with special short inserts to address bore wear. | 11th Nov 1938 | Box 132 \ 5 scan0020 | |
| Letter from The British Piston Ring Co Ltd regarding a delay in an order for Short Cylinder Inserts. | 23th Nov 1938 | Box 132 \ 5 scan0021 | |
| Cylinder bore wear for chassis engines, advising on the availability of special inserts and machining dimensions. | 8th Dec 1938 | Box 132 \ 5 scan0022 | |
| The completion and allocation of eight cylinder blocks for testing cylinder bore wear. | 10th Jan 1939 | Box 132 \ 5 scan0023 | |
| Letter from the Experimental Department requesting the supply of short cylinder inserts. | 18th Jan 1939 | Box 132 \ 5 scan0024 | |
| Request to place an official order for cylinder liners with The British Piston Ring Co. Ltd. | 18th Jan 1939 | Box 132 \ 5 scan0025 | |
| Requesting the production of 12 cylinder inserts from phosphor chrome for testing and comparison. | 18th Jan 1939 | Box 132 \ 5 scan0026 | |
| Cylinder bore wear, piston design, and the effects of superchargers and carburetters. | 18th Jan 1939 | Box 132 \ 5 scan0027 | |
| Internal request to order short cylinder inserts from The British Piston Ring Co. Ltd. | 21th Jan 1939 | Box 132 \ 5 scan0028 | |
| The despatch of special cylinder blocks for wear testing. | 23th Jan 1939 | Box 132 \ 5 scan0029 | |
| Letter from The British Piston Ring Co Ltd regarding pricing for Cylinder Inserts and querying a potential duplicate order. | 25th Jan 1939 | Box 132 \ 5 scan0030 | |
| Continuation sheet of a letter from The British Piston Ring Co. Ltd. to Rolls-Royce Ltd. | 26th Jan 1939 | Box 132 \ 5 scan0031 | |
| Letter to The British Piston Ring Co. clarifying an order and asking for advice on measuring cylinder bore wear. | 26th Jan 1939 | Box 132 \ 5 scan0032 | |
| Cylinder bore wear, comparing chromium plating and liners as solutions. | 27th Jan 1939 | Box 132 \ 5 scan0033 | |
| Visit to Rover Co. regarding their process for chromium plating cylinder bores. | 25th Jan 1939 | Box 132 \ 5 scan0034 | |
| Experimental stage of chromium plating engine bores. | 25th Jan 1939 | Box 132 \ 5 scan0035 | |
| Hand-drawn cross-section diagram of a chromium layer on cast iron before honing. | 25th Jan 1939 | Box 132 \ 5 scan0036 | |
| Cross-section diagram on graph paper showing a cast iron component with a chromium layer before honing. | 13th Feb 1939 | Box 132 \ 5 scan0037 | |
| Proposing a comprehensive programme to investigate cylinder bore wear. | 13th Feb 1939 | Box 132 \ 5 scan0038 | |
| List of questions and action items concerning the investigation of cylinder bore wear. | 13th Feb 1939 | Box 132 \ 5 scan0039 | |
| List of numbered technical questions regarding engine cylinder accuracy, experiments, bore wear, and ring tension. | 13th Feb 1939 | Box 132 \ 5 scan0040 | |
| Reducing piston and cylinder bore wear in the new Bentley engine by chrome plating the bores. | 15th Feb 1939 | Box 132 \ 5 scan0041 | |
| Intensive programme to address the problem of cylinder bore wear by testing different types of cylinder liners. | 20th Feb 1939 | Box 132 \ 5 scan0042 | |
| Outlining a suggested programme for testing bore wear on development cars using various experimental materials. | 20th Feb 1939 | Box 132 \ 5 scan0043 | |
| Outlining a development programme for cylinder bore wear testing on various engine units. | 21th Feb 1939 | Box 132 \ 5 scan0044 | |
| Specifications for cylinder inserts and pistons for various car models. | 21th Feb 1939 | Box 132 \ 5 scan0045 | |
| Instructions for fitting short cylinder inserts and pistons for B.60 No.2 and other chassis units. | 21th Feb 1939 | Box 132 \ 5 scan0046 | |
| Letter from the Experimental Department to The British Piston Ring Co. Ltd. regarding the delivery of an order for short inserts. | 22th Feb 1939 | Box 132 \ 5 scan0047 | |
| Letter from The British Piston Ring Co Ltd confirming dispatch of short cylinder inserts. | 23th Feb 1939 | Box 132 \ 5 scan0048 | |
| Testing cylinder bore wear using either a 24 G.VI or a 25 HP Vauxhall. | 24th Feb 1939 | Box 132 \ 5 scan0049 | |
| Letter to The British Piston Ring Co. Ltd. about cracked cylinder blocks found during testing of cylinder inserts. | 28th Feb 1939 | Box 132 \ 5 scan0050 | |
| Request for a quotation to machine cylinder inserts from The British Piston Ring Co. Ltd. | 10th Mar 1939 | Box 132 \ 5 scan0051 | |
| Significant issue of engine cylinder bore wear and planned investigations. | 11th Mar 1939 | Box 132 \ 5 scan0052 | |
| Summary of work and data on cylinder bore wear for various engine models. | 11th Mar 1939 | Box 132 \ 5 scan0053 | |
| Analysis of Bentley 'M' series cylinder bore wear, discussing the history of chilled bores and material specifications. | 11th Mar 1939 | Box 132 \ 5 scan0054 | |
| Experimental cylinder liner materials being tested for resistance to bore wear. | 11th Mar 1939 | Box 132 \ 5 scan0055 | |
| Engine bore wear, material testing methods, and the development and use of cylinder inserts. | 11th Mar 1939 | Box 132 \ 5 scan0056 | |
| Engine bore treatments, including chrome plating, and the comparative effects of different piston types on bore wear. | 11th Mar 1939 | Box 132 \ 5 scan0057 | |
| Technical report on piston performance, comparing Aerolite and standard pistons, and discussing issues like piston slap and oil consumption. | 11th Mar 1939 | Box 132 \ 5 scan0058 | |
| Series of accelerated bore wear tests on a standard cylinder block. | 11th Mar 1939 | Box 132 \ 5 scan0059 | |
| Methods and results of engine wear tests, specifically Test No. 3, Test No. 4, and Test No. 1. | 11th Mar 1939 | Box 132 \ 5 scan0060 | |
| Test report detailing wear on engine liners under various operating conditions. | 11th Mar 1939 | Box 132 \ 5 scan0061 | |
| Report discussing engine bore wear, piston rings, oil control, and crankcase breathing. | 11th Mar 1939 | Box 132 \ 5 scan0062 | |
| Piston ring performance, comparing pegged vs. floating rings and different piston materials. | 11th Mar 1939 | Box 132 \ 5 scan0063 | |
| Letter from The British Piston Ring Co Ltd discussing the supply and pricing of short cylinder inserts. | 13th Mar 1939 | Box 132 \ 5 scan0064 | |
| Letter to The British Piston Ring Co. Ltd. regarding the machining of inserts. | 17th Mar 1939 | Box 132 \ 5 scan0065 | |
| Letter from The British Piston Ring Co Ltd requesting material and casting dimensions for Short Cylinder Inserts in order to calculate machining costs. | 17th Mar 1939 | Box 132 \ 5 scan0066 | |
| Letter from The British Piston Ring Co Ltd regarding an order confusion with incorrectly marked Short Cylinder Inserts. | 20th Mar 1939 | Box 132 \ 5 scan0067 | |
| Letter from The British Piston Ring Co Ltd quoting a price for machining Short Cylinder Inserts. | 20th Mar 1939 | Box 132 \ 5 scan0068 | |
| Letter from The British Piston Ring Co Ltd regarding an order mix-up with cylinder inserts. | 21th Mar 1939 | Box 132 \ 5 scan0069 | |
| Letter from the British Piston Ring Co. Ltd. comparing the finish of Hicrome inserts to those made of Brivadium. | 21th Mar 1939 | Box 132 \ 5 scan0070 | |
| Visit to The Light Production Co. Ltd. in Slough concerning piston manufacturing. | 22th Mar 1939 | Box 132 \ 5 scan0071 | |
| Comparison of 'Aerolite' and 'R.R.' piston specifications covering gudgeon pin fit, machining, ageing, and pressure testing. | 23th Mar 1939 | Box 132 \ 5 scan0072 | |
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