| Description | Date | Identifier | |
| Corrosion between slipper wheel fabrics and the slipper wheel, suspecting chlorine as the cause. | 20th Oct 1937 | Box 134 \ 1 scan0037 | |
| Design consideration document for a four-port exhaust system, comparing it to Bentley and Wraith heads. | 8th Nov 1937 | Box 134 \ 1 scan0038 | |
| Feasibility of adapting a four-port head from the Wraith head. | 8th Nov 1937 | Box 134 \ 1 scan0039 | |
| Brief note on the complexity of a B.M.W. Cylinder Head. | 17th Nov 1937 | Box 134 \ 1 scan0040 | |
| Comments and analysis on a B.M.W. cylinder head, comparing its component count to a Bentley engine. | 16th Nov 1937 | Box 134 \ 1 scan0041 | |
| Comparison of a B.I.W. head design to a Bentley, focusing on the higher parts count and potential for tappet noise. | 16th Nov 1937 | Box 134 \ 1 scan0042 | |
| Blueprint cross-section of a Frazer-Nash B.M.W. cylinder head with a hemispherical combustion chamber. | 9th Nov 1937 | Box 134 \ 1 scan0043 | |
| Letter from Coventry Climax Engines Ltd regarding engine weights and testing a cylinder head. | 17th Nov 1937 | Box 134 \ 1 scan0044 | |
| Note outlining the threefold gain in speed from using exhaust momentum manifolds. | 7th Dec 1937 | Box 134 \ 1 scan0045 | |
| The effects of applying exhaust momentum manifolds to various aircraft. | 26th Nov 1937 | Box 134 \ 1 scan0046 | |
| Technical analysis of exhaust system performance and momentum effects on various aircraft. | 26th Nov 1937 | Box 134 \ 1 scan0047 | |
| Engine characteristics, fuel consumption, and performance with a fixed pitch airscrew. | 26th Nov 1937 | Box 134 \ 1 scan0048 | |
| Graph showing gains in speed for various aircraft when fitted with exhaust momentum manifolds. | 26th Nov 1937 | Box 134 \ 1 scan0049 | |
| Two graphs showing performance gains in speed and power from exhaust momentum manifolds on engines with fixed pitch airscrews. | 14th Dec 1937 | Box 134 \ 1 scan0050 | |
| The development of a high-power cylinder head, discussing valve design and performance. | 14th Dec 1937 | Box 134 \ 1 scan0051 | |
| Power comparison report between the No. 5 'Phoenix Type' and No. 4 cylinder heads for the Bentley 50 Type engine. | 13th Dec 1937 | Box 134 \ 1 scan0052 | |
| Engine smoothness and turbulence, comparing two high power head designs via ignition advance curves. | 13th Dec 1937 | Box 134 \ 1 scan0053 | |
| Graph comparing power curves at constant detonation for different cylinder heads using a paraffin-shell fuel mixture. | 13th Dec 1937 | Box 134 \ 1 scan0054 | |
| Report page detailing engine detonation tests, percentage power loss figures, and valve timing settings. | 13th Dec 1937 | Box 134 \ 1 scan0055 | |
| Graph and text comparing valve timings for a high power cylinder head. | 13th Dec 1937 | Box 134 \ 1 scan0056 | |
| Report and graph showing the effect of exhaust valve lift on engine power. | 13th Dec 1937 | Box 134 \ 1 scan0057 | |
| Mechanical failures during testing, specifically concerning cylinder head collapse and exhaust valve issues. | 13th Dec 1937 | Box 134 \ 1 scan0058 | |
| Cover note for a report on a Buick-type piston project with inconclusive results. | 21th Dec 1937 | Box 134 \ 1 scan0059 | |
| Tests using Buick type pistons on a modified Bentley engine. | 21th Dec 1937 | Box 134 \ 1 scan0060 | |
| Comparative power curve analysis between Buick type and standard Bentley pistons. | 21th Dec 1937 | Box 134 \ 1 scan0061 | |
| Graph comparing compression pressures of Buick type and standard Bentley pistons against engine RPM. | 21th Dec 1937 | Box 134 \ 1 scan0062 | |
| Graph comparing theoretical power curves for Buick type pistons against a standard Bentley engine. | 21th Dec 1937 | Box 134 \ 1 scan0063 | |
| Comparison of calculated versus actual engine performance data, with an analysis of power loss and volumetric efficiency. | 21th Dec 1937 | Box 134 \ 1 scan0064 | |
| Engine detonation and pre-ignition, comparing the performance of Buick and Standard Bentley pistons. | 21th Dec 1937 | Box 134 \ 1 scan0065 | |
| Performance comparison of Buick and standard pistons at various compression ratios on a 25/30 unit. | 21th Dec 1937 | Box 134 \ 1 scan0066 | |
| Comparative power test report on Buick type pistons versus standard pistons at constant detonation. | 21th Dec 1937 | Box 134 \ 1 scan0067 | |
| Recommending the suspension of single-cylinder engine work and proceeding with the B.50 engine project. | 22th Dec 1937 | Box 134 \ 1 scan0068 | |
| Suspending all work on the single-cylinder chassis unit. | 22th Dec 1937 | Box 134 \ 1 scan0069 | |
| Suspending work on the Buick piston project due to disappointing results. | 22th Dec 1937 | Box 134 \ 1 scan0070 | |
| Engine valve overlap and timing considerations. | 24th Jan 1938 | Box 134 \ 1 scan0071 | |
| Valve timing settings and maximum Mean Effective Pressure and Brake Horsepower performance figures. | 24th Jan 1938 | Box 134 \ 1 scan0072 | |
| Experiments on engine valve overlap timing. | 24th Jan 1938 | Box 134 \ 1 scan0073 | |
| Analysis of advanced valve timing at Top Dead Centre (T.D.C.) and its effect on residual cylinder and exhaust pressures. | 24th Jan 1938 | Box 134 \ 1 scan0074 | |
| Graph comparing cylinder pressure and exhaust stub pressure with advanced valve timing at 3000 rpm. | 24th Jan 1938 | Box 134 \ 1 scan0075 | |
| Hand-drawn graph plotting engine pressure against crank angles, detailing induction and exhaust cycles at 3500 rpm. | 24th Jan 1938 | Box 134 \ 1 scan0076 | |
| Engine valve timing, performance comparisons between J.A.P. and Austin engines, and development targets. | 24th Jan 1938 | Box 134 \ 1 scan0077 | |
| Letter discussing a paper on steering and personal matters. | 24th Jan 1938 | Box 134 \ 1 scan0078 | |
| Letter to Dr. J.C. Morrison regarding engine valve timing experiments and enclosed report. | 24th Jan 1938 | Box 134 \ 1 scan0079 | |
| Letter discussing a difficulty with exhaust valve closing and the length of the toe used in cams. | 24th Jan 1938 | Box 134 \ 1 scan0080 | |
| Letter from John C. Morrison of the University of Glasgow discussing engine testing and other projects. | 1st Apr 1938 | Box 134 \ 1 scan0081 | |
| Possibilities of a two-valve ramp cylinder head design to reduce engine detonation. | 1st Apr 1938 | Box 134 \ 1 scan0082 | |
| The process and rationale for conducting single-cylinder engine work as the need arises. | 6th May 1938 | Box 134 \ 1 scan0083 | |
| Letter from James Watt Engineering Laboratories regarding a visit to the works. | 18th May 1938 | Box 134 \ 1 scan0084 | |
| Letter from the James Watt Engineering Laboratories discussing the performance testing of an Alvis engine. | 12th May 1938 | Box 134 \ 1 scan0085 | |
| Letter on University of Glasgow letterhead from John C. Morrison discussing engine noise, manifold modification, and new engine performance. | 13th May 1938 | Box 134 \ 1 scan0086 | |
| Letter discussing tests on Duplex manifold and separate exhaust systems. | 13th May 1938 | Box 134 \ 1 scan0087 | |
| Letter to Dr. J.C. Morrison concerning the status of O.H.V. engine testing. | 13th May 1938 | Box 134 \ 1 scan0088 | |
| Letter to Dr. J.C. Morrison regarding a potential meeting at the Works on June 15th. | 20th May 1938 | Box 134 \ 1 scan0089 | |
| Letter from James Watt Engineering Laboratories discussing the sharing of experimental data and system results. | 15th Jun 1938 | Box 134 \ 1 scan0090 | |
| Letter detailing test results on exhaust systems and camshaft timings for a 4¼-litre Bentley engine. | 15th Jun 1938 | Box 134 \ 1 scan0091 | |
| Letter to Dr. J.C. Morrison regarding conclusions on later exhaust closing for improved performance. | 15th Jun 1938 | Box 134 \ 1 scan0092 | |
| Letter to Mr. Robotham from the University of Glasgow discussing the basis of a technical consultation and the expenses incurred. | 25th Jun 1938 | Box 134 \ 1 scan0093 | |
| Letter from the University of Glasgow requesting a donation of machinery due to a lack of funds for their workshop and laboratory. | 25th Jun 1938 | Box 134 \ 1 scan0094 | |
| Letter expressing frustration over the design of an engine exhaust system and the lack of confidence shown. | 25th Jun 1938 | Box 134 \ 1 scan0095 | |
| Letter discussing engine performance issues, including power, noise, and compression. | 27th Jun 1938 | Box 134 \ 1 scan0096 | |
| Outlining further tests on a Bentley single cylinder unit to match B.60 specification. | 27th Jun 1938 | Box 134 \ 1 scan0097 | |
| Letter to Dr. J.C. Morrison of Glasgow University regarding a complex silencing problem and previous correspondence. | 28th Jun 1938 | Box 134 \ 1 scan0098 | |
| Letter from John C. Morrison of Glasgow University to Mr. Robotham regarding a misunderstanding and the cessation of their cooperation. | 30th Jun 1938 | Box 134 \ 1 scan0099 | |
| Taking over a High Power Head engine project that Leylands abandoned due to exhaust valve issues. | 1st Jul 1938 | Box 134 \ 1 scan0100 | |
| Letter from Leyland Motors discussing connecting rods, an engine test report, and crankcase painting. | 30th Jun 1938 | Box 134 \ 1 scan0101 | |
| Letter from Leyland Motors regarding the painting processes for engine cylinder blocks and crankcases. | 30th Jun 1938 | Box 134 \ 1 scan0102 | |
| Request for blueprints and parts for a high power Bentley single-cylinder engine test, focusing on an increased compression ratio. | 5th Oct 1938 | Box 134 \ 1 scan0103 | |
| Experimental department report on the vibration of a 4.2' bore single cylinder liquid-cooled sleeve valve engine. | 17th Oct 1938 | Box 134 \ 1 scan0104 | |
| The vibration of a 4.2' bore single-cylinder liquid-cooled sleeve valve engine. | 17th Oct 1938 | Box 134 \ 1 scan0105 | |
| Vibration data for a single-cylinder L.C. sleeve valve 4.2' engine under various conditions. | 13th Oct 1938 | Box 134 \ 1 scan0106 | |
| Graph showing vibration variation during a power curve run on a liquid-cooled single-cylinder sleeve valve engine. | 13th Oct 1938 | Box 134 \ 1 scan0107 | |
| Graph showing the variation of vibration with ignition advance for a liquid-cooled single-cylinder sleeve valve engine. | 13th Oct 1938 | Box 134 \ 1 scan0108 | |
| Graph showing the variation of vibration with boost for a liquid-cooled single-cylinder sleeve valve engine. | 13th Oct 1938 | Box 134 \ 1 scan0109 | |
| Experimental department report on the vibration of a 5.5' bore single cylinder S.V. engine. | 21th Nov 1938 | Box 134 \ 1 scan0110 | |
| Vibration readings taken from a 5.5' S.V. single-cylinder engine unit. | 21th Nov 1938 | Box 134 \ 1 scan0111 | |
| Graphs showing vibration of a 5.5 inch bore single cylinder side-valve engine. | 16th Nov 1938 | Box 134 \ 1 scan0112 | |
| Report comparing single cylinder head and piston configurations for a Bentley engine, with accompanying diagrams. | 23th Dec 1938 | Box 134 \ 1 scan0113 | |
| Report page analyzing ramp head engine performance and spark plug positioning. | 23th Dec 1938 | Box 134 \ 1 scan0114 | |
| Comparing two cylinder head designs, including diagrams and specifications for valve timing and compression ratios. | 23th Dec 1938 | Box 134 \ 1 scan0115 | |
| Test report and blueprint for a Bentley No. 3a cylinder head, with comparison to a No. 5 head. | 23th Dec 1938 | Box 134 \ 1 scan0116 | |
| Note on engine timing for single carburetter characteristics and port ramming to achieve optimum results. | 23th Dec 1938 | Box 134 \ 1 scan0117 | |
| Graph comparing the maximum power figures of different single cylinder engine heads. | 23th Dec 1938 | Box 134 \ 1 scan0118 | |
| Graph comparing Mean Effective Pressure (MEP) against RPM for different ramp head and piston configurations at maximum power. | 23th Dec 1938 | Box 134 \ 1 scan0119 | |
| Graph of a non-detonating power curve on Redline fuel, showing M.E.P. and ignition advance vs R.P.M. | 23th Dec 1938 | Box 134 \ 1 scan0120 | |
| Graph comparing Mean Effective Pressure vs. engine R.P.M. for a spark plug in the exhaust position versus the side position. | 10th Jan 1939 | Box 134 \ 1 scan0121 | |
| Scheme for modifying the crankcase and camshafts in the Bentley Single Cylinder Unit. | 10th Jan 1939 | Box 134 \ 1 scan0122 | |
| Official order for bearing races for a Bentley S/C Unit. | 27th Jan 1939 | Box 134 \ 1 scan0123 | |
| Letter from the Experimental Department to The Hoffman Manufacturing Co. Ltd. regarding an urgent order for bearings. | 30th Jan 1939 | Box 134 \ 1 scan0124 | |
| Request to draw up a scheme for fitting a Sunbury Pressure element to a B.II head. | 2nd Feb 1939 | Box 134 \ 1 scan0125 | |
| Requesting additional flanges and adaptors for the B.60 Chassis' standard Sunbury Indicator fittings. | 2nd Feb 1939 | Box 134 \ 1 scan0126 | |
| Clarifying specifications for Single Cylinder Bentley Unit heads and requesting a new scheme. | 7th Feb 1939 | Box 134 \ 1 scan0127 | |
| Requesting the machining of a high power single cylinder unit block. | 8th Feb 1939 | Box 134 \ 1 scan0128 | |
| Parts list for a Bentley single cylinder high power head, detailing required components by section. | 15th Feb 1939 | Box 134 \ 1 scan0129 | |
| Listing parts with quantities, organized by section number, required for testing on a single-cylinder unit. | 9th Feb 1939 | Box 134 \ 1 scan0130 | |
| The purchase of one Indicator Valve from Messrs. Dobbie McInnes & Clyde Ltd. | 20th Feb 1939 | Box 134 \ 1 scan0131 | |
| Letter to Messrs. Dobbie, McInnes & Clyde Ltd. requesting the urgent forwarding of a 'C' type Indicator valve. | 20th Feb 1939 | Box 134 \ 1 scan0132 | |
| Request to manufacture extension pieces and two complete valves for a Farnborough indicator valve related to a Chassis C/C Unit. | 20th Feb 1939 | Box 134 \ 1 scan0133 | |
| Request to replace a loose valve seat on a Bentley Single Cylinder head with an oversized one. | 20th Feb 1939 | Box 134 \ 1 scan0134 | |
| Instruction for parts and blueprints for a Single Cylinder Bentley High Power Unit cylinder head. | 21th Feb 1939 | Box 134 \ 1 scan0135 | |
| Work instructions for a single cylinder unit and B.60 engine components. | 22th Feb 1939 | Box 134 \ 1 scan0136 | |
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