| Description | Date | Identifier | |
| A.E.C. Specification No. 22 for the chemical composition and hardness of cast iron for piston rings. | 1st Jun 1935 | Box 132 \ 4 scan0035 | |
| Technical drawing of a Cylinder Liner. | 1st Feb 1934 | Box 132 \ 4 scan0036 | |
| Technical drawing for a Piston Ring. | 5th Jul 1935 | Box 132 \ 4 scan0037 | |
| Letter to The Associated Equipment Co. Ltd. acknowledging receipt of their letter. | 2nd Dec 1936 | Box 132 \ 4 scan0038 | |
| Letter to The Ohio Crankshaft Company inquiring about the 'TOCCO Process' for crankshaft hardening. | 23th Dec 1936 | Box 132 \ 4 scan0039 | |
| Comparative investigation into the cost and material specifications of cylinder liner castings from four different suppliers. | 4th Jan 1937 | Box 132 \ 4 scan0040 | |
| The procurement, cost analysis, and manufacturing process for cylinder liners. | 4th Jan 1937 | Box 132 \ 4 scan0041 | |
| Visit from the Midland Cylinder Co. concerning a faulty cylinder casting due to porosity. | 8th Jan 1937 | Box 132 \ 4 scan0042 | |
| Scheme for fitting a small rubber to the Phantom III cylinder liners. | 8th Jan 1937 | Box 132 \ 4 scan0043 | |
| Letter from the Electric Furnace Company Ltd. regarding correspondence about the TOCCO process involving the Ohio Crankshaft Co. | 20th Jan 1937 | Box 132 \ 4 scan0044 | |
| Letter to the Electric Furnace Co. Ltd. regarding the Tocco Process. | 21th Jan 1937 | Box 132 \ 4 scan0045 | |
| Letter from The Ohio Crankshaft Company responding to an inquiry about the TOCCO hardening process. | 8th Jan 1937 | Box 132 \ 4 scan0046 | |
| Advertisement for the 1937 Packard Twelve focusing on its Tocco-hardened crankshaft. | 8th Jan 1937 | Box 132 \ 4 scan0047 | |
| Advertisement for the TOCCO PROCESS of surface-hardening crankshafts by electrical induction. | 8th Jan 1937 | Box 132 \ 4 scan0048 | |
| Informational leaflet promoting the use of TOCCO-hardened crankshafts in Yellow Coach buses. | 8th Jan 1937 | Box 132 \ 4 scan0049 | |
| Advertisement for TOCCO-hardened crankshafts highlighting their longevity and cost-saving benefits. | 8th Jan 1937 | Box 132 \ 4 scan0050 | |
| Informational brochure detailing the TOCCO PROCESS for the surface hardening of crankshaft bearings by induction. | 8th Jan 1937 | Box 132 \ 4 scan0051 | |
| Brochure explaining the TOCCO PROCESS for hardening metal surfaces quickly and inexpensively. | 3rd Feb 1937 | Box 132 \ 4 scan0052 | |
| Letter requesting a copy of a 'Treatise on Cylinder Wear' from H.A. Grinding Co. Ltd. | 3rd Feb 1937 | Box 132 \ 4 scan0053 | |
| Urgent internal memo requesting an order for Corrujoint and C. & A. cylinder head gaskets. | 4th Feb 1937 | Box 132 \ 4 scan0054 | |
| Quality report rejecting five cylinder blocks due to casting defects and low Brinell hardness. | 12th Feb 1937 | Box 132 \ 4 scan0055 | |
| Necessity of drilling certain holes in car engine cylinder heads for inspection purposes. | 19th Feb 1937 | Box 132 \ 4 scan0056 | |
| The return and replacement of cylinder block castings. | 19th Mar 1937 | Box 132 \ 4 scan0057 | |
| Arranging for an investigation into cylinder distortion using parts borrowed from Lagonda. | 9th Apr 1937 | Box 132 \ 4 scan0058 | |
| Confirming an agreement to supply cylinder blocks from Midland Cylinder Co and a porous block for laboratory analysis. | 1st May 1937 | Box 132 \ 4 scan0059 | |
| Request for a comparative analysis of two cylinders to investigate porosity and wear issues. | 4th May 1937 | Box 132 \ 4 scan0060 | |
| Confirming the machining of a cylinder block at Kingsbury and providing an order number. | 10th May 1937 | Box 132 \ 4 scan0061 | |
| Laboratory report on the advantages of casting Bentley iron cylinders without chills. | 22th May 1937 | Box 132 \ 4 scan0062 | |
| Cylinder castings, comparing Chromidium material with standard castings and discussing future policy and design modifications. | 24th May 1937 | Box 132 \ 4 scan0063 | |
| Copy of a letter from The Midland Motor Cylinder Co. Ltd. declining a request to use a special nickel alloy for cylinder castings. | 10th May 1937 | Box 132 \ 4 scan0064 | |
| Use of 'Chromidium' iron for cylinder castings and its potential wear effects. | 25th May 1937 | Box 132 \ 4 scan0065 | |
| Modifications to cast iron for chassis cylinders to improve wear resistance. | 25th May 1937 | Box 132 \ 4 scan0066 | |
| 15,000-mile test run comparing a lower Brinell hardness cylinder block from Midland Cylinder Co. against a standard block. | 26th May 1937 | Box 132 \ 4 scan0067 | |
| Cylinder bore dimension measurements for a B3 unit cylinder block after 16,922 miles. | 24th Dec 1936 | Box 132 \ 4 scan0068 | |
| Cylinder bore wear and dimension measurements for Block EB 2929 after a 16,000-mile road test. | 24th Dec 1936 | Box 132 \ 4 scan0069 | |
| Summary of I.A.E. research findings on material wear resistance for components like cylinders and piston rings. | 27th May 1937 | Box 132 \ 4 scan0070 | |
| Findings on engine bore wear and the performance of various components. | 27th May 1937 | Box 132 \ 4 scan0071 | |
| Analysis of engine bore wear, comparing Midland cylinder blocks to in-house blocks and noting the effects of ventilation. | 27th May 1937 | Box 132 \ 4 scan0072 | |
| Metallurgical analysis on the effects of adding chromium and nickel to an alloy during casting. | 27th May 1937 | Box 132 \ 4 scan0073 | |
| Comparison of the chemical composition and properties of various cylinder irons. | 27th May 1937 | Box 132 \ 4 scan0074 | |
| Note on the chemical analysis of materials, comparing phosphorus content in liners. | 1st Jun 1937 | Box 132 \ 4 scan0075 | |
| Results of a Brinell hardness test performed on an I/C G.M. cylinder block. | 1st Jun 1937 | Box 132 \ 4 scan0076 | |
| Modifications to cylinder casting techniques for 25/30, Bentley, and Wraith models. | 15th May 1937 | Box 132 \ 4 scan0077 | |
| Comparing material specifications for cast iron cylinder blocks between in-house production and an external supplier. | 25th Jun 1937 | Box 132 \ 4 scan0078 | |
| Visit to the I.A.E. Research Dept. to discuss cylinder bore wear and oil consumption. | 17th Aug 1937 | Box 132 \ 4 scan0079 | |
| Engine component materials, hardness, and finishing techniques for wear reduction. | 17th Aug 1937 | Box 132 \ 4 scan0080 | |
| Ring flutter, bearing tests, and gear tooth measurement. | 17th Aug 1937 | Box 132 \ 4 scan0081 | |
| Letter from J. Payen Ltd. about Cylinder Head Gasket E.88842 and a visit from Mr. Fleck. | 21th Aug 1937 | Box 132 \ 4 scan0082 | |
| Letter providing a quotation and recommendations for gaskets, discussing material thickness and water sealing. | 20th Aug 1937 | Box 132 \ 4 scan0083 | |
| Letter from J. Payen Ltd. recommending gasket testing before a production order and arranging a meeting. | 1st Sep 1937 | Box 132 \ 4 scan0084 | |
| The super honed finish for cylinder bores, noting improved oil consumption. | 1st Sep 1937 | Box 132 \ 4 scan0085 | |
| To the Iron Foundry requesting a hold on the production of an experimental cylinder block. | 9th Sep 1937 | Box 132 \ 4 scan0086 | |
| Test results on cylinder bores of low Brinell hardness. | 28th Sep 1937 | Box 132 \ 4 scan0087 | |
| Bentley cylinder bore wear and oil consumption tests for car B.23.AE. | 28th Sep 1937 | Box 132 \ 4 scan0088 | |
| Test results for a venturi crankcase breather and cylinder wear measurements. | 11th Oct 1937 | Box 132 \ 4 scan0089 | |
| Series of questions regarding a report on oil consumption and cylinder wear in Bentley engines. | 11th Oct 1937 | Box 132 \ 4 scan0090 | |
| Page discussing a proposed standard test for cylinder bore wear on a Wraith engine. | 11th Oct 1937 | Box 132 \ 4 scan0091 | |
| Cylinder bore durability, oil consumption, and the testing of different cylinder liners. | 27th Oct 1937 | Box 132 \ 4 scan0092 | |
| Oil consumption and cylinder wear with conclusions on piston rings, clearance, and oil viscosity. | 19th Oct 1937 | Box 132 \ 4 scan0093 | |
| Investigations and recommendations concerning engine oil consumption and cylinder wear. | 19th Oct 1937 | Box 132 \ 4 scan0094 | |
| List of recommendations to improve engine bore wear, followed by a note on oil consumption tests. | 19th Oct 1937 | Box 132 \ 4 scan0095 | |
| Oil consumption tests for different piston and ring configurations. | 19th Oct 1937 | Box 132 \ 4 scan0096 | |
| Oil consumption test results for split skirt pistons with various piston ring arrangements. | 19th Oct 1937 | Box 132 \ 4 scan0097 | |
| Report page with a graph detailing oil consumption tests for various piston and ring configurations. | 19th Oct 1937 | Box 132 \ 4 scan0098 | |
| Report with a graph detailing oil consumption tests on various piston ring configurations. | 19th Oct 1937 | Box 132 \ 4 scan0099 | |
| Graphs and text detailing oil consumption tests in relation to engine pressure and speed. | 19th Oct 1937 | Box 132 \ 4 scan0100 | |
| Oil tests comparing viscosity at 100°C with oil consumption rates for different brands. | 19th Oct 1937 | Box 132 \ 4 scan0101 | |
| Bentley oil consumption tests with various piston ring arrangements. | 19th Oct 1937 | Box 132 \ 4 scan0102 | |
| Bentley oil consumption tests showing results of different piston ring configurations and low viscosity oils. | 19th Oct 1937 | Box 132 \ 4 scan0103 | |
| Comparison of oil consumption and blow-by between cylinder blocks machined whilst on the crankcase versus those machined in the normal manner. | 19th Oct 1937 | Box 132 \ 4 scan0104 | |
| Analysis of ring flutter, its effect on oil consumption, and blow-by under different engine loads, including a related graph. | 19th Oct 1937 | Box 132 \ 4 scan0105 | |
| Comparative analysis of piston and ring details and a discussion on engine ring flutter speeds. | 19th Oct 1937 | Box 132 \ 4 scan0106 | |
| Analysis of cylinder bore wear comparing Aerolite and Split Skirt pistons in Bentley engines. | 19th Oct 1937 | Box 132 \ 4 scan0107 | |
| Report page analysing Bentley cylinder bore wear across different chassis series and piston types, with an accompanying graph. | 19th Oct 1937 | Box 132 \ 4 scan0108 | |
| Comparison of Brinell hardness at various points on centrifugally cast and individually cast piston rings. | 19th Oct 1937 | Box 132 \ 4 scan0109 | |
| Engine oil consumption at various speeds and proposed tests with an increased capacity oil pump to improve bore wear. | 19th Oct 1937 | Box 132 \ 4 scan0110 | |
| Graph comparing Bentley cylinder bore wear between Aerolite and Split Skirt pistons over mileage. | 11th Oct 1940 | Box 132 \ 4 scan0111 | |
| Request to the Works Laboratory to section and micrograph three cylinder blocks to show wear and plating. | 11th Oct 1940 | Box 132 \ 4 scan0112 | |
| Letter from Richard Klinger Ltd. advising of a delay to an order for Klingerit 1000 material due to the need to re-roll it. | 21th Oct 1937 | Box 132 \ 4 scan0113 | |
| Letter from Richard Klinger Ltd. confirming the dispatch of 6 sample Cylinder Head gaskets. | 27th Oct 1937 | Box 132 \ 4 scan0114 | |
| To Mr. Vickers of the Iron Foundry confirming an agreement to supply 16 cylinder liners for Phantom III engines. | 12th Nov 1937 | Box 132 \ 4 scan0115 | |
| Letter to Richard Klinger Ltd. discussing quotations and specifications for cylinder head joints. | 15th Dec 1937 | Box 132 \ 4 scan0116 | |
| Letter to R. Klinger Ltd. regarding a quotation and a new order for joints. | 15th Dec 1937 | Box 132 \ 4 scan0117 | |
| Production difficulties with a four-port cylinder head and a recommendation to proceed with a revised design. | 16th Dec 1937 | Box 132 \ 4 scan0118 | |
| Instructing a change to a different cylinder head for the 'D' series due to casting supply issues. | 17th Dec 1937 | Box 132 \ 4 scan0119 | |
| From Rm. to RHC. forwarding a letter from the Buick Foundry. | 30th Dec 1937 | Box 132 \ 4 scan0120 | |
| Letter to Buick Motor Division regarding cylinder cores. | 30th Dec 1937 | Box 132 \ 4 scan0121 | |
| Report from the Iron Foundry on the results and scrap rates for batches of Bentley 25/30 Cylinder Block castings. | 1st Feb 1938 | Box 132 \ 4 scan0122 | |
| Bentley & 25/30 cylinder blocks and a new integrated block/crankcase engine design. | 4th Feb 1938 | Box 132 \ 4 scan0123 | |
| Confirming satisfaction with a high phosphorous cylinder liner material and suggesting a trial production run. | 10th Feb 1938 | Box 132 \ 4 scan0124 | |
| Letter to Richard Klinger Ltd. discussing tests on 'Klingerit 1000' cylinder head gaskets and ordering more for experimental use. | 11th Feb 1938 | Box 132 \ 4 scan0125 | |
| Letter from Richard Klinger Ltd. confirming an order for 1000 gaskets and discussing a graphite treatment process to prevent joints from sticking. | 15th Feb 1938 | Box 132 \ 4 scan0126 | |
| Letter from Richard Klinger Ltd. regarding treated 'Klingerit 1000' cylinder head gaskets being sent for testing. | 16th Feb 1938 | Box 132 \ 4 scan0127 | |
| Letter to a supplier regarding an order and samples of cylinder head gaskets. | 18th Feb 1938 | Box 132 \ 4 scan0128 | |
| Tests to determine the effect of improved waterways on cylinder head temperatures. | 3rd Mar 1938 | Box 132 \ 4 scan0129 | |
| Line chart comparing engine head temperatures with different water pumps at 1000 and 3000 RPM. | 3rd Mar 1938 | Box 132 \ 4 scan0130 | |
| Diagram showing points at which local head temperatures were recorded on the exhaust and inlet sides. | 26th Apr 1938 | Box 132 \ 4 scan0131 | |
| Graph showing average cylinder wear and the number of cylinder blocks from various series. | 26th Apr 1938 | Box 132 \ 4 scan0132 | |
| Graph comparing cylinder wear and reboring rates for different engine series and piston types. | 9th Apr 1938 | Box 132 \ 4 scan0133 | |
| Graph showing average cylinder wear per 30,000 miles on a Bentley 6 1/2 Litre engine, comparing Smith-Bentley and Twin SU carburetors. | 9th Apr 1938 | Box 132 \ 4 scan0134 | |
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