| Description | Date | Identifier | |
| Bearing modifications for the 2nd Bensport's Experimental Car. | 18th Feb 1933 | Box 85 \ 5 scan0025 | |
| Weight reduction campaign for a Bentley crankshaft by machining holes. | 26th Apr 1933 | Box 85 \ 5 scan0026 | |
| Blueprint showing a cross-section of a component with a diameter dimension. | 26th Apr 1933 | Box 85 \ 5 scan0027 | |
| Balance issues and proposed modifications for a Bensport crankshaft. | 29th Apr 1933 | Box 85 \ 5 scan0028 | |
| Calculations on the critical speeds of the lightened Bensport crankshaft. | 9th May 1933 | Box 85 \ 5 scan0029 | |
| Comparison table for various Bensport J.1. crankshaft configurations and their properties. | 11th May 1933 | Box 85 \ 5 scan0030 | |
| Requesting an experimental lightened 'Bensport Crankshaft' be made, detailing the modifications. | 11th May 1933 | Box 85 \ 5 scan0031 | |
| Experimental lightening of a Bensport crankshaft and related design considerations. | 12th May 1933 | Box 85 \ 5 scan0032 | |
| The oil grooving specifications for Bentley Main Bearings. | 24th May 1933 | Box 85 \ 5 scan0033 | |
| Piston and crankshaft failures during a high-speed endurance test on a Bentley Unit C.13 engine. | 26th Aug 1933 | Box 85 \ 5 scan0034 | |
| Failure report concerning a No.6 balance weight breaking through the crankcase due to a broken retaining stud. | 8th Aug 1933 | Box 85 \ 5 scan0035 | |
| Blueprint drawing illustrating a Bentley piston failure with dimensional data. | 29th Aug 1933 | Box 85 \ 5 scan0036 | |
| Correct friction setting for a Bentley crankshaft spring drive. | 25th May 1933 | Box 85 \ 5 scan0037 | |
| Technical note on increasing the critical speed of a Bensport crankshaft by modifying journal size and bearing shells. | 19th Jun 1933 | Box 85 \ 5 scan0038 | |
| Dimensioned drawing for a crankshaft journal and bearing cap stud arrangement. | 31th Jul 1933 | Box 85 \ 5 scan0039 | |
| Broken slipper drive centre from a 3 1/2 Litre Bentley, urgently requesting advice as the issue is delaying a chassis. | 31th Jul 1933 | Box 85 \ 5 scan0040 | |
| Examination of a 3 1/2 Litre Bentley slipper drive, concluding the engine was over-revved. | 3rd Aug 1933 | Box 85 \ 5 scan0041 | |
| Modifications for improved spigotting for the mounting of a Bentley slipper flywheel. | 25th Aug 1933 | Box 85 \ 5 scan0042 | |
| Two separate incidents of balance weight failures on a Bentley unit and another engine in France. | 26th Aug 1933 | Box 85 \ 5 scan0043 | |
| Halting work on Bentley chassis crankshafts due to a balance weight failure. | 28th Aug 1933 | Box 85 \ 5 scan0044 | |
| Cause of failures in Bentley crankshaft balance weights and proposing design improvements. | 29th Aug 1933 | Box 85 \ 5 scan0045 | |
| Crankshaft problems in the 3½ litre Bentley and the urgent requirement for a four-bearing crank. | 31th Aug 1933 | Box 85 \ 5 scan0046 | |
| Suggesting that balance weights be forged solid with the crankshaft. | 31th Aug 1933 | Box 85 \ 5 scan0047 | |
| Making balance weights solid with the crankshaft and issues with failures on a Bentley engine. | 1st Sep 1933 | Box 85 \ 5 scan0048 | |
| Modifications to Bentley balance weights for the first 15 engines. | 1st Sep 1933 | Box 85 \ 5 scan0049 | |
| Bentley development regarding a lightened crankshaft, detailing vibration issues and flywheel loosening at high RPM. | 8th Sep 1933 | Box 85 \ 5 scan0050 | |
| Drawing for a Bentley Solid Crankshaft. | 11th Sep 1933 | Box 85 \ 5 scan0051 | |
| Analysis of methods to raise the critical speed of a Bensport crankshaft. | 12th Sep 1933 | Box 85 \ 5 scan0052 | |
| Cost benefits and forging possibilities of a Bentley solid crankshaft. | 20th Sep 1933 | Box 85 \ 5 scan0053 | |
| Effect on critical speed of using Duralumin connecting rods in a Bentley. | 23th Sep 1933 | Box 85 \ 5 scan0054 | |
| Requesting the supply of springs for experiments on the new Bentley spring drive. | 27th Oct 1933 | Box 85 \ 5 scan0055 | |
| Request to manufacture driving springs for a Bentley spring drive to be fitted to a test car. | 11th Nov 1933 | Box 85 \ 5 scan0056 | |
| Requesting the creation of a set of balance weights for a fully balanced Bentley crankshaft test. | 11th Nov 1933 | Box 85 \ 5 scan0057 | |
| Request to manufacture a distance piece and several discs for experiments on the new Bentley spring drive. | 11th Dec 1933 | Box 85 \ 5 scan0058 | |
| The design, calibration, and performance testing of a new Bentley crankshaft damper and spring drive. | 13th Dec 1933 | Box 85 \ 5 scan0059 | |
| Testing modifications to a damper and spring drive to address oscillation and rattle issues. | 13th Dec 1933 | Box 85 \ 5 scan0060 | |
| Test report on a spring drive's damping, critical oscillation, and gear rattle characteristics. | 13th Dec 1933 | Box 85 \ 5 scan0061 | |
| The development and testing of light alloy connecting rods for the 3 1/2 Litre Bentley. | 24th Jan 1934 | Box 85 \ 5 scan0062 | |
| Standardisation of a felt ring for the rear of a crankshaft bearing. | 20th Dec 1933 | Box 85 \ 5 scan0063 | |
| Order of R.B.1659 Damping Springs for the Bentley Chassis Spring Drive. | 16th Feb 1934 | Box 85 \ 5 scan0064 | |
| Making model ribs for a crankcase for a 4-bearing crankshaft. | 16th May 1934 | Box 85 \ 5 scan0065 | |
| Experiment on the number of bearings for Bentley Crankshafts. | 19th Jun 1934 | Box 85 \ 5 scan0066 | |
| Design features and modifications for an experimental Bentley 4 Bearing Crankshaft. | 29th Jun 1934 | Box 85 \ 5 scan0067 | |
| Experiments to increase the critical speed of a Bentley crankshaft. | 24th Jul 1934 | Box 85 \ 5 scan0068 | |
| Crankshaft and bearing modifications for improved engine performance and safety. | 24th Jul 1934 | Box 85 \ 5 scan0069 | |
| Modifications to a Bentley crankshaft to increase its critical speed and safety margin. | 6th Aug 1934 | Box 85 \ 5 scan0070 | |
| Test report on B.10 unit with a special crankshaft, focusing on noisy Textolite gears and an endurance test failure. | 8th Aug 1934 | Box 85 \ 5 scan0071 | |
| Endurance test detailing oil system modifications and an ignition system replacement. | 29th Aug 1934 | Box 85 \ 5 scan0072 | |
| Fitting a light disc flywheel and Borg & Beck clutch to a B.10 unit for high-speed roughness tests. | 29th Aug 1934 | Box 85 \ 5 scan0073 | |
| Crankshaft oiling schemes, comparing issues with Bentley engines to Phantom and Wraith models. | 9th Oct 1934 | Box 85 \ 5 scan0074 | |
| Modifications to the Bentley narrow bearing crankshaft to prevent flywheel flutter. | 9th Oct 1934 | Box 85 \ 5 scan0075 | |
| Crankshaft wear on the Bentley and 20/25 models. | 10th Oct 1934 | Box 85 \ 5 scan0076 | |
| Crankshaft oiling schemes, comparing the continuous oil feed of the Bentley system against the Phantom scheme. | 11th Oct 1934 | Box 85 \ 5 scan0077 | |
| Request to prepare a second set of parts for N.Sch.4190 and to leave the flywheel undrilled. | 12th Oct 1934 | Box 85 \ 5 scan0078 | |
| Requesting the production of forgings for a narrow pin crankshaft after successful testing. | 23th Oct 1934 | Box 85 \ 5 scan0079 | |
| Surprisingly weak results of a torsion test on a 4-bearing crankshaft. | 30th Oct 1934 | Box 85 \ 5 scan0080 | |
| Upcoming 10,000-mile test on a B.10 unit, focusing on narrow pin crankshafts and bearing wear. | 1st Nov 1934 | Box 85 \ 5 scan0081 | |
| Requesting the completion of models for the analysis of a 4-bearing crankshaft. | 14th Dec 1934 | Box 85 \ 5 scan0082 | |
| Crankshaft modifications and experiments for supercharging 6-cylinder Bentley engines. | 21th Jan 1935 | Box 85 \ 5 scan0083 | |
| Test bed and torsion test results comparing a four-bearing and a seven-bearing Bentley crankshaft. | 19th Jan 1935 | Box 85 \ 5 scan0084 | |
| Analysis of crankshaft stiffness, comparing a 4-bearing shaft with a 7-bearing shaft and the potential benefits of design alterations. | 19th Jan 1935 | Box 85 \ 5 scan0085 | |
| Summary of observed and calculated critical speeds for various Bentley engine crankshafts. | 19th Jan 1935 | Box 85 \ 5 scan0086 | |
| Model crank torsion test results showing angular deflections for short and long crank pins. | 2nd Jan 1935 | Box 85 \ 5 scan0087 | |
| Graph comparing the torsion test results of a 4-bearing crankshaft with a standard 7-bearing crankshaft. | 24th Oct 1934 | Box 85 \ 5 scan0088 | |
| Graph showing the angular deflections from model crank torsion tests. | 2nd Jan 1935 | Box 85 \ 5 scan0089 | |
| Blueprint of a model crankshaft to determine the effect of a long crank pin on torsional stiffness. | 2nd Jan 1935 | Box 85 \ 5 scan0090 | |
| Blueprint illustrating three different designs of Bentley crankshafts. | 29th Jan 1935 | Box 85 \ 5 scan0091 | |
| Analysis of seven-bearing crankshafts, comparing component inertia and stiffness for different balance configurations. | 29th Jan 1935 | Box 85 \ 5 scan0092 | |
| Page from a report analyzing the relationship between web thickness, stiffness, and inertia, including calculations. | 29th Jan 1935 | Box 85 \ 5 scan0093 | |
| Comparison of weights for two different types of crankshafts. | 22th Mar 1935 | Box 85 \ 5 scan0094 | |
| Request to produce parts to increase the inertia of a Bentley crankshaft damper for high-speed roughness experiments. | 8th Apr 1935 | Box 85 \ 5 scan0095 | |
| Crankshaft design improvements for the Bentley 3.5' bore engine. | 29th Jun 1935 | Box 85 \ 5 scan0096 | |
| Crankpin length, lubrication improvements, and oil cooling recommendations for an engine. | 29th Jun 1935 | Box 85 \ 5 scan0097 | |
| Blueprint comparing a suggested crankshaft for a 3.5 Bore Engine against an existing narrow pin crank. | 28th Jul 1925 | Box 85 \ 5 scan0098 | |
| Confirming a request for big end oil flow tests on a Bentley crankshaft. | 12th Jul 1935 | Box 85 \ 5 scan0099 | |
| Crankshaft dimensions for a large bore Bentley engine. | 17th Jul 1935 | Box 85 \ 5 scan0100 | |
| Calculations for new crankshafts comparing the effect of different journal and pin dimensions on engine speed. | 17th Jul 1935 | Box 85 \ 5 scan0101 | |
| Comparison table of projected bearing areas, critical speeds, and crankpin areas for various component configurations. | 19th Jul 1935 | Box 85 \ 5 scan0102 | |
| Instruction to investigate cracks in a large bore Bentley crankcase by cutting it up and testing a sample. | 19th Jul 1935 | Box 85 \ 5 scan0103 | |
| Letter to a supplier regarding an unsatisfactory crankshaft damper friction lining, requesting experimental cork washers. | 4th Sep 1935 | Box 85 \ 5 scan0104 | |
| Requesting the preparation of a Bentley crankshaft pin for a cold storage bearing test. | 9th Oct 1935 | Box 85 \ 5 scan0105 | |
| The distribution of L.O.P. and details for the Large Bore Bentley Chassis crankshaft. | 26th Nov 1935 | Box 85 \ 5 scan0106 | |
| Request to manufacture a crank pinion with a 45° helix angle for an increased inertia crankshaft damper, to be fitted to a Bentley B-19 unit. | 2nd Dec 1935 | Box 85 \ 5 scan0107 | |
| Balancing a Bentley crankshaft, based on methods from Packard and outlining required experiments and modifications. | 10th Mar 1936 | Box 85 \ 5 scan0108 | |
| Achieving better crankshaft balance with less counterweights, with a conclusion to test on aero engines. | 20th May 1936 | Box 85 \ 5 scan0109 | |
| Short memo confirming a copy of a previous memo and sketch was handed to Gry. | 20th May 1936 | Box 85 \ 5 scan0110 | |
| Static deflection tests for a new method of positioning crankshaft balance weights on a Bentley crankshaft. | 20th May 1936 | Box 85 \ 5 scan0111 | |
| Crankshaft balancing schemes, counterweights, and vibration analysis for an engine. | 20th May 1936 | Box 85 \ 5 scan0112 | |
| Blueprint detailing the method of fitting Packard type balance weights to a Bentley crankshaft. | 1st Dec 1937 | Box 85 \ 5 scan0113 | |
| Comparison of a standard Bentley crankshaft and a Bentley crankshaft with Packard balance weights. | 1st Dec 1937 | Box 85 \ 5 scan0114 | |
| Outlining an experiment to determine the inaccuracy in crankshaft balancing caused by an initial shaft bow. | 24th Apr 1936 | Box 85 \ 5 scan0115 | |
| Design proposal for Packard-type balance weights for a Bentley crankshaft, machined from existing forging, requesting an experimental test. | 25th May 1936 | Box 85 \ 5 scan0116 | |
| Instructions and drawings list for a Bentley chassis crankshaft experiment using Packard Type balance weights. | 11th Jun 1936 | Box 85 \ 5 scan0117 | |
| Letter to Federal Mogul Corp. regarding a drawing of a Bentley crankshaft for White Metal Bearings. | 28th Oct 1936 | Box 85 \ 5 scan0118 | |
| Scoring on Bentley crankshafts with Hall's metal bearings and proposing a standardized treatment. | 2nd Nov 1936 | Box 85 \ 5 scan0119 | |
| Technical memorandum on the satisfactory method for regrinding crankshafts. | 2nd Nov 1936 | Box 85 \ 5 scan0120 | |
| Request to test a 'Hykro' crankshaft against a standard V.C.M. shaft for wear over 15,000 miles. | 3rd Nov 1936 | Box 85 \ 5 scan0121 | |
| Calculation of the stiffness ratio for a proposed Bentley crankshaft compared to the standard. | 1st Dec 1936 | Box 85 \ 5 scan0122 | |
| Dispatch of crankshaft components for the 25/30 and Bentley models. | 17th Dec 1936 | Box 85 \ 5 scan0123 | |
| Arguing for the use of 'Hykro' material for Bentley 25/30 HP Chassis crankshafts. | 30th Dec 1936 | Box 85 \ 5 scan0124 | |
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