| Description | Date | Identifier | |
| Internal order request for one patent copper gasket from Wills Pressure Filled Joint Ring Ltd. | 27th Aug 1934 | Box 86 \ 1 scan0092 | |
| Letter from a supplier regarding gaskets for experimental purposes and customer feedback. | 30th Aug 1934 | Box 86 \ 1 scan0093 | |
| Use of a higher compression head on a stream-lined Bentley. | 24th Sep 1934 | Box 86 \ 1 scan0094 | |
| Request to modify connecting rods and big end bearings for extra cylinder lubrication tests. | 25th Sep 1934 | Box 86 \ 1 scan0095 | |
| Use of higher compression heads on Bentley engines and the development of a suction control scheme for ignition advance. | 25th Sep 1934 | Box 86 \ 1 scan0096 | |
| Confirming receipt of an invoice from Messrs. Wills for a special gasket. | 1st Oct 1934 | Box 86 \ 1 scan0097 | |
| Letter to Wills Pressure Filled Joint Rings Ltd. concerning a special gasket for a Bentley cylinder head. | 1st Oct 1934 | Box 86 \ 1 scan0098 | |
| Letter from Wills Pressure Filled Joint Ring, Ltd. regarding the use and pressure holding capabilities of their joint rings. | 2nd Oct 1934 | Box 86 \ 1 scan0099 | |
| Modification of a Bentley Cylinder Head to fit a B-6 Unit. | 20th Oct 1934 | Box 86 \ 1 scan0100 | |
| Request to replace inlet valves in high compression Bentley cylinder heads. | 25th Oct 1934 | Box 86 \ 1 scan0101 | |
| Experiments on extra cylinder lubrication to prevent piston seizure during cold starts on Bentley engines. | 2nd Nov 1934 | Box 86 \ 1 scan0102 | |
| Scheme for extra cylinder lubrication during cold starts to prevent piston seizure. | 2nd Nov 1934 | Box 86 \ 1 scan0103 | |
| Lubrication tests for a modified big end bearing and connecting rod. | 2nd Nov 1954 | Box 86 \ 1 scan0104 | |
| Oil consumption tests on a Bentley unit with and without modifications to the connecting rods. | 2nd Nov 1934 | Box 86 \ 1 scan0105 | |
| Blueprint for a modification to the No. 6 connecting rod. | 24th Sep 1921 | Box 86 \ 1 scan0106 | |
| Blueprint for a modification to a connecting rod (Con-Rod). | 24th Sep 1921 | Box 86 \ 1 scan0107 | |
| Blueprint showing a modification to the top half of a big end bearing. | 25th Sep 1942 | Box 86 \ 1 scan0108 | |
| Request to expedite testing on a new type of Bentley cylinder head before it enters production. | 14th Nov 1934 | Box 86 \ 1 scan0109 | |
| Request to order 12 Bentley cylinder head gaskets from The Southwark Manufacturing Co. | 5th Dec 1934 | Box 86 \ 1 scan0110 | |
| Request to produce a modified set of exhaust valves for a Bentley cylinder head test. | 1st Jan 1935 | Box 86 \ 1 scan0111 | |
| Instructing a change in exhaust valve diameter for a Bentley competition cylinder head. | 2nd Jan 1935 | Box 86 \ 1 scan0112 | |
| Five specific tasks related to car cylinder heads. | 15th Jan 1935 | Box 86 \ 1 scan0113 | |
| Urgent work required on car cylinder heads and associated components. | 17th Jan 1935 | Box 86 \ 1 scan0114 | |
| Material choice and design for the Bentley Silent Tappet Head. | 21th Jan 1935 | Box 86 \ 1 scan0115 | |
| Follow-up letter from Wills Pressure Filled Joint Ring, Limited regarding gasket testing and potential orders. | 30th Jan 1935 | Box 86 \ 1 scan0116 | |
| Testing and potential customer offering of a new high compression head for Bentley cars. | 4th Feb 1935 | Box 86 \ 1 scan0117 | |
| Graph showing the power output of a 3 1/2 Litre Bentley B.4 Unit engine under two different test configurations. | 31th Jan 1935 | Box 86 \ 1 scan0118 | |
| Design recommendations for a Bentley high-compression cylinder head. | 7th Feb 1935 | Box 86 \ 1 scan0119 | |
| The failure of a Bentley high compression cylinder head (EX.16041) and proposed modifications for a new casting. | 7th Feb 1935 | Box 86 \ 1 scan0120 | |
| Letter from Wills Pressure Filled Joint Ring, Ltd. following up on a visit and discussing designs for exhaust and inlet joint rings. | 7th Feb 1935 | Box 86 \ 1 scan0121 | |
| Letter to Wills Pressure Filled Joint Rings Ltd. requesting the manufacture of 6 Patent Ring Joints for a Bentley exhaust manifold. | 11th Feb 1935 | Box 86 \ 1 scan0122 | |
| Letter from Wills Pressure Filled Joint Ring confirming an order for six rings from drawing EB.115. | 12th Feb 1935 | Box 86 \ 1 scan0123 | |
| Request to modify a Bentley Cylinder Head to accept larger exhaust valves. | 19th Feb 1935 | Box 86 \ 1 scan0124 | |
| The advantages and modifications for the Bentley Close Centres Cylinder Head. | 20th Feb 1935 | Box 86 \ 1 scan0125 | |
| Comparison of cylinder heads EB.2050 and Lec.3662, detailing performance and detonation characteristics. | 20th Feb 1935 | Box 86 \ 1 scan0126 | |
| Report comparing two cylinder heads (EB.2050 and Lec.3662) based on performance tests and weight. | 20th Feb 1935 | Box 86 \ 1 scan0127 | |
| Graph comparing the performance of three different Bentley cylinder head configurations against engine RPM. | 30th Jan 1935 | Box 86 \ 1 scan0128 | |
| Performance comparison graph for two different Bentley cylinder heads. | 18th Feb 1935 | Box 86 \ 1 scan0129 | |
| Testing and standardisation of a new high compression head for the Bentley. | 21th Feb 1935 | Box 86 \ 1 scan0130 | |
| Investigation and design options for Bentley High Compression Heads. | 10th Sep 1934 | Box 86 \ 1 scan0131 | |
| Cylinder head EB.2050 detailing service failure risks and standardization decisions. | 23th Feb 1935 | Box 86 \ 1 scan0132 | |
| Design options and modifications for Bentley High Compression Heads. | 23th Feb 1935 | Box 86 \ 1 scan0133 | |
| Design flaws and modifications related to the EB.2050 cylinder head. | 23th Feb 1935 | Box 86 \ 1 scan0134 | |
| The delay in processing the standardisation sheet for Bentley High Compression Heads. | 27th Feb 1935 | Box 86 \ 1 scan0135 | |
| Standardisation of a cast iron cylinder head machined to Hs.1372 for improved performance. | 7th Sep 1934 | Box 86 \ 1 scan0136 | |
| Estimated cost for extra jigs, tools, and equipment. | 30th Nov 1935 | Box 86 \ 1 scan0137 | |
| Request to modify a Bentley Cylinder Head to restore original combustion space capacity. | 5th Mar 1935 | Box 86 \ 1 scan0138 | |
| Instructions for modifications to a LeC.3662 Cylinder Head, including stelliting exhaust valves. | 11th Mar 1935 | Box 86 \ 1 scan0139 | |
| Standardisation and modification of Bentley cylinder heads to increase horsepower. | 11th Mar 1935 | Box 86 \ 1 scan0140 | |
| Modifications to Bentley cylinder heads to increase power output and the results of related tests. | 9th Mar 1935 | Box 86 \ 1 scan0141 | |
| Graph comparing the maximum ignition advance to avoid detonation for a cylinder head before and after modification. | 2nd Mar 1935 | Box 86 \ 1 scan0142 | |
| Graph comparing the performance of different Bentley cylinder head configurations. | 30th Jan 1935 | Box 86 \ 1 scan0143 | |
| Blueprint sketch showing modifications to a cylinder head to improve power output. | 15th Mar 1935 | Box 86 \ 1 scan0144 | |
| Blueprint detailing a modification to a cylinder head component with various dimensions. | 11th Mar 1935 | Box 86 \ 1 scan0145 | |
| Sketch showing the modification of E.B.615 cores to suit the LEC 3662 cylinder head. | 17th Mar 1938 | Box 86 \ 1 scan0146 | |
| Drawing of a modified high-compression cylinder head. | 11th May 1939 | Box 86 \ 1 scan0147 | |
| Additional requirement for a new set of push rods for Mr. R. Summers' Car, Chassis B-169-CW. | 21th Mar 1935 | Box 86 \ 1 scan0148 | |
| Requesting an order for modified nickel cylinder head gaskets for an experimental engine. | 30th Mar 1935 | Box 86 \ 1 scan0149 | |
| Causes and potential solutions for piston seizures on Bentley cars. | 4th Apr 1935 | Box 86 \ 1 scan0150 | |
| Blueprint showing a modification to a con-rod, detailing the drilling of a hole. | 4th Apr 1935 | Box 86 \ 1 scan0151 | |
| Requesting the fitting of an additional flange to the cylinder head of a B-23-AE engine unit. | 6th Apr 1935 | Box 86 \ 1 scan0152 | |
| Blueprint for an additional flange for a 2nd rocker cover for a Bentley. | 11th Apr 1935 | Box 86 \ 1 scan0153 | |
| Piston seizures on the Bentley 3/25 model. | 11th Apr 1935 | Box 86 \ 1 scan0154 | |
| Following up on an order for heads for chassis B-11-EN, belonging to Mr. C.R. Fairey. | 12th Apr 1935 | Box 86 \ 1 scan0155 | |
| Instructions to prepare a high compression cylinder head for chassis B-11-BN for Mr. C.R. Fairey. | 11th Apr 1935 | Box 86 \ 1 scan0156 | |
| Instructions to fit high compression cylinder heads on three specific Bentley chassis. | 13th Apr 1935 | Box 86 \ 1 scan0157 | |
| Controversy over increased maximum speed from a high compression cylinder head on a Bentley. | 15th Apr 1935 | Box 86 \ 1 scan0158 | |
| And evaluating different schemes for lubricating engine cylinder walls. | 15th Apr 1935 | Box 86 \ 1 scan0159 | |
| Acknowledging a request regarding a high compression cylinder head for a Bentley. | 26th Apr 1935 | Box 86 \ 1 scan0160 | |
| Costs and considerations for fitting high compression cylinder heads, Aerolite pistons, and lead bronze bearings to Bentley cars. | 18th Apr 1935 | Box 86 \ 1 scan0161 | |
| The production timeline for high compression cylinder heads on specific Bentley chassis. | 18th Apr 1935 | Box 86 \ 1 scan0162 | |
| Cylinder head capacity of a 3.5' bore Bentley engine and modifications needed for use on a 20/25 model. | 25th Apr 1935 | Box 86 \ 1 scan0163 | |
| Standardisation of parts for an oil feed to the cylinder wall from the connecting rod. | 5th Apr 1935 | Box 86 \ 1 scan0164 | |
| Estimated cost for extra jigs, tools, and equipment for the 'E' series chassis. | 17th Apr 1935 | Box 86 \ 1 scan0165 | |
| Requesting an order for three similar C. & A. gaskets for a 20/25 3 1/4' bore engine. | 29th May 1935 | Box 86 \ 1 scan0166 | |
| Promotional letter from Henry Wiggin & Company regarding the benefits and testimonials for their Cupro-Nickel gaskets. | 1st May 1935 | Box 86 \ 1 scan0167 | |
| Informational leaflet from Henry Wiggin & Company Ltd. about their Cupro-Nickel Corrugated Gaskets. | 6th Aug 1935 | Box 86 \ 1 scan0168 | |
| Variations in cylinder head volumes on Bentley engines and the effect on compression and detonation. | 6th Aug 1935 | Box 86 \ 1 scan0169 | |
| The capacities of combustion chambers for B.5 and Y.4B.B units. | 31th Jul 1935 | Box 86 \ 1 scan0170 | |
| Confirmation of a request to modify a large bore Bentley cylinder head drawing to increase the compression ratio. | 16th Aug 1935 | Box 86 \ 1 scan0171 | |
| Requesting the modification of cylinder head E.B.615 to drawing number Hs.2118. | 10th Sep 1935 | Box 86 \ 1 scan0172 | |
| Response to a request to increase the inlet port area on a Large Bore Bentley Cylinder Head. | 17th Sep 1935 | Box 86 \ 1 scan0173 | |
| Request to modify the Large Bore Bentley Cylinder Head, recommending the use of the original design. | 17th Sep 1935 | Box 86 \ 1 scan0174 | |
| New drawing for a Large Bore Bentley Cylinder rocker cover. | 27th Sep 1935 | Box 86 \ 1 scan0175 | |
| Request to order six C. & A. gaskets for a large bore Bentley engine with non-standard stud centres. | 14th Oct 1935 | Box 86 \ 1 scan0176 | |
| New drawings and part replacements for the Large Bore Bentley cylinder, valves, and fittings. | 23th Oct 1935 | Box 86 \ 1 scan0177 | |
| Specifications for machining a Large Bore Bentley cylinder head to achieve a 6.4/1 compression ratio. | 14th Nov 1935 | Box 86 \ 1 scan0178 | |
| Request for a larger bore Bentley cylinder block and head for comparison purposes. | 20th Nov 1935 | Box 86 \ 1 scan0179 | |
| Listing new drawings and parts for a Large Bore Bentley Chassis Cylinder, explaining the reason for a delay in their formal issue. | 26th Nov 1935 | Box 86 \ 1 scan0180 | |
| Request for three Bentley cylinder blocks to be honed to new dimensions for piston clearance tests. | 18th Dec 1935 | Box 86 \ 1 scan0181 | |
| Confirming an alteration to drawing EB.2560 for the 3.500 Bore Bentley Head. | 23th Dec 1935 | Box 86 \ 1 scan0182 | |
| Test for cylinder distortion and running an engine without water between the bores to increase displacement. | 13th Jan 1936 | Box 86 \ 1 scan0183 | |
| Letter from Rudge-Whitworth Ltd enquiring about the chromium plating of cylinder bores. | 30th Jan 1936 | Box 86 \ 1 scan0184 | |
| Letter from Rudge-Whitworth Ltd. regarding tests on sodium-cooled valves. | 31th Jan 1936 | Box 86 \ 1 scan0185 | |
| Letter to Rudge-Whitworth Ltd. regarding the testing of chromium cylinder bores. | 31th Jan 1936 | Box 86 \ 1 scan0186 | |
| Tests conducted after removing the turbulent lip from a 20/25 4¼ bore cylinder head Lec.5002. | 20th Mar 1936 | Box 86 \ 1 scan0187 | |
| Ignition and detonation test results for a modified cylinder head on Engine No. B-9. | 20th Mar 1936 | Box 86 \ 1 scan0188 | |
| Ignition and detonation test data for Engine No. B-9 using Cylinder Head E.60660 and Shell No. 1 test bed exhaust system. | 20th Mar 1936 | Box 86 \ 1 scan0189 | |
| Power comparison table for an EB. 615 head fitted to a standard engine with an open exhaust. | 20th Mar 1936 | Box 86 \ 1 scan0190 | |
| Performance data table for a deturbulated Bentley cylinder head. | 20th Mar 1936 | Box 86 \ 1 scan0191 | |
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