| Description | Date | Identifier | |
| Photograph of a Bentley 6C No.1 unit oil pump top driving gear after a 50-hour endurance test. | 24th Feb 1939 | Box 123 \ 5 scan0331 | |
| Photograph showing a Bentley 60 water pump spindle and bearing before and after a 50-hour endurance test, highlighting corrosion. | 24th Feb 1939 | Box 123 \ 5 scan0332 | |
| Photograph of a failed inlet valve spring after a 50-hour endurance test. | 24th Feb 1939 | Box 123 \ 5 scan0333 | |
| Photograph showing twelve bottom tappets from a Bentley 60 No.1 Unit after a 50-hour endurance test, arranged in two columns. | 15th Feb 1939 | Box 123 \ 5 scan0334 | |
| Test report detailing cylinder bore dimensions before and after a running test. | 15th Feb 1939 | Box 123 \ 5 scan0335 | |
| Dimensional inspection report for main bearings, detailing measurements before and after testing. | 15th Feb 1939 | Box 123 \ 5 scan0336 | |
| Test report detailing connecting rod bearing and crankpin dimensions before and after running. | 15th Feb 1939 | Box 123 \ 5 scan0337 | |
| Piston profile wear measurements for six 'Aerolite' high crown pistons following a timed test. | 15th Feb 1939 | Box 123 \ 5 scan0338 | |
| Development of cutting techniques and tools for .4 carbon steel crankshafts. | 24th Feb 1939 | Box 123 \ 5 scan0339 | |
| The teardown and analysis of a 6-cylinder high-power engine after 190 hours of testing. | 25th Feb 1939 | Box 123 \ 5 scan0340 | |
| The B.60 No.1 unit 50-hour endurance test, detailing unit specifications and running conditions. | 25th Feb 1939 | Box 123 \ 5 scan0341 | |
| Engine endurance test results, including performance metrics and component failures. | 25th Feb 1939 | Box 123 \ 5 scan0342 | |
| Various component failures during an endurance run. | 25th Feb 1939 | Box 123 \ 5 scan0343 | |
| Engine component failures and inspection results, including comparisons with Bentley components. | 25th Feb 1939 | Box 123 \ 5 scan0344 | |
| Inspection report detailing the condition of engine parts and conclusions after a development run. | 25th Feb 1939 | Box 123 \ 5 scan0345 | |
| Request for a new induction pipe with a larger bore for an 8-cylinder engine to enable further testing. | 25th Feb 1939 | Box 123 \ 5 scan0346 | |
| Request to produce drawings for mounting a Sperry Torsiograph on B.60 and B.80 cranks. | 27th Feb 1939 | Box 123 \ 5 scan0347 | |
| Tappets fouling the camshaft journals on B.60 & B.80 units, with a suggested modification. | 27th Feb 1939 | Box 123 \ 5 scan0348 | |
| Design memorandum for a crankshaft with increased diameter journals and revised balancing for the B.60 and C.I. Conventional 6 models. | 28th Feb 1939 | Box 123 \ 5 scan0349 | |
| Requesting the production of trial B.60 and B.80 camshafts to address poor idling issues, with specific timing details. | 2nd Mar 1939 | Box 124 \ 1 scan0001 | |
| List of new and standard parts required for a Sperry Torsiograph experiment on Bentley 60 & 80 models. | 2nd Mar 1939 | Box 124 \ 1 scan0002 | |
| Exhaust manifold and downtake for the C.I. Conventional 8 engine. | 2nd Mar 1939 | Box 124 \ 1 scan0003 | |
| Comparing the cost and design of different push rods for B.60 and B.80 engines. | 2nd Mar 1939 | Box 124 \ 1 scan0004 | |
| The distribution of blueprints and production of the exhaust system for the B.80 engine in the Wraith 80 chassis. | 3rd Mar 1939 | Box 124 \ 1 scan0005 | |
| Direct comparison of cylinder head gaskets for B.60 and B.80 engines. | 4th Mar 1939 | Box 124 \ 1 scan0006 | |
| Strip examination report on the condition of a Bentley 80 No. 1 Unit engine. | 6th Mar 1939 | Box 124 \ 1 scan0007 | |
| Inspection report detailing the condition of various engine components, page 2. | 6th Mar 1939 | Box 124 \ 1 scan0008 | |
| Photograph showing the main bearings from a Bentley B80 No.1 Unit after 68 hours of running. | 6th Mar 1939 | Box 124 \ 1 scan0009 | |
| Photograph of Bentley SO No.1 Unit connecting rod bearings after 68 hours of running. | 6th Mar 1939 | Box 124 \ 1 scan0010 | |
| Photograph of bottom tappets from a Bentley SO No.1 Unit after 56 hours of running. | 6th Mar 1939 | Box 124 \ 1 scan0011 | |
| Listing the weights of various engine components and calculating a total weight. | 25th Oct 1939 | Box 124 \ 1 scan0012 | |
| Note explaining the methodology for calculating the total weight of the B.60 engine. | 25th Oct 1939 | Box 124 \ 1 scan0013 | |
| Photograph of the B 60 engine unit, near side view. | 1st Sep 1938 | Box 124 \ 1 scan0014 | |
| Photograph showing the off side of a B.60 engine unit. | 1st Sep 1938 | Box 124 \ 1 scan0015 | |
| Front-view photograph of a B.60 engine unit. | 1st Sep 1938 | Box 124 \ 1 scan0016 | |
| Photograph showing a broken inlet valve spring and washer from a Bentley GO No.1 unit. | 23th Feb 1939 | Box 124 \ 1 scan0017 | |
| Test report detailing the dimensions and wear of main bearings and a crankshaft following a 68-hour running test. | 23th Feb 1939 | Box 124 \ 1 scan0018 | |
| Test report detailing main bearing dimensions before and after a running test. | 23th Feb 1939 | Box 124 \ 1 scan0019 | |
| Test report detailing before and after measurements for connecting rod bearings and crankpin dimensions. | 23th Feb 1939 | Box 124 \ 1 scan0020 | |
| Test report detailing the dimensions and wear of connecting rod bearings and crankpins. | 23th Feb 1939 | Box 124 \ 1 scan0021 | |
| Test report detailing cylinder bore dimensions and wear for a Bentley 80 No.1 unit. | 23th Feb 1939 | Box 124 \ 1 scan0022 | |
| Cylinder bore dimensions and wear measurements for unit BEN.80.No 1. | 23th Feb 1939 | Box 124 \ 1 scan0023 | |
| Test report detailing valve dimensions and pocketting for a Bentley 80 No.1 unit after a 68-hour run. | 23th Feb 1939 | Box 124 \ 1 scan0024 | |
| Test report detailing valve dimensions and wear for a Bentley 80 No.1 unit. | 23th Feb 1939 | Box 124 \ 1 scan0025 | |
| Piston profile measurements and wear data for 'Aerolite' Standard Bentley pistons following a 68-hour test. | 23th Feb 1939 | Box 124 \ 1 scan0026 | |
| Piston profiles and wear measurements for 'Aerolite' standard Bentley pistons. | 23th Feb 1939 | Box 124 \ 1 scan0027 | |
| Requesting authorisation for an experiment on the B.80 induction system. | 7th Mar 1939 | Box 124 \ 1 scan0028 | |
| Instructing HPS to arrange for a torsional indicator drive shaft to be taken from the camshaft of a B. 80 unit. | 7th Mar 1939 | Box 124 \ 1 scan0029 | |
| Modification to the B.80 fan pulley, changing it to a two-part welded construction. | 3rd Mar 1939 | Box 124 \ 1 scan0030 | |
| Modifications required for an inverted tooth chain drive for the camshaft. | 8th Mar 1939 | Box 124 \ 1 scan0031 | |
| Chain types for endurance testing and requesting an experiment on a B.60 chain drive. | 8th Mar 1939 | Box 124 \ 1 scan0032 | |
| Comparison of the weights for the B.60 and B.80 engines. | 8th Mar 1939 | Box 124 \ 1 scan0033 | |
| Modified two-part welded construction for a fan pulley. | 1st Mar 1939 | Box 124 \ 1 scan0034 | |
| Modifications for the water connections between a B.80 engine and radiator in a B.38 chassis. | 8th Mar 1939 | Box 124 \ 1 scan0035 | |
| Instructions for a modified Push Rod and Adjusting Screw for Bentley 60 and 80 Chassis, including new part numbers. | 9th Mar 1939 | Box 124 \ 1 scan0036 | |
| Failure of a B.80 No.2 unit's main bearing, its return for inspection, and a request for a replacement unit. | 9th Mar 1939 | Box 124 \ 1 scan0037 | |
| Design and required modifications for a crankshaft damper and spring drive for the Bentley 80 and C.I. Conv. 8 models. | 11th Mar 1939 | Box 124 \ 1 scan0038 | |
| New drawings for a Bentley 60 Chassis cylinder head, including blueprints. | 14th Mar 1939 | Box 124 \ 1 scan0039 | |
| Top water connection for the B.80 engine in the Wraith 80 chassis. | 14th Mar 1939 | Box 124 \ 1 scan0040 | |
| Requesting schemes for adapting a Buick harmonic damper for a B.80 unit and drawing a modified Aerolite piston. | 15th Mar 1939 | Box 124 \ 1 scan0041 | |
| Test results on a cast iron engine unit in a 29.G.VI car, comparing carburettor performance for slow running. | 15th Jun 1939 | Box 124 \ 1 scan0042 | |
| List of parts required for the inlet pipes and carburettor on the Bentley 60 and Wraith III chassis. | 16th Mar 1939 | Box 124 \ 1 scan0043 | |
| New drawings for the Bentley 60 Chassis cylinder head and valve mechanism. | 17th Mar 1939 | Box 124 \ 1 scan0044 | |
| Alterations to stiffened tappet covers to improve their seal. | 17th Mar 1939 | Box 124 \ 1 scan0045 | |
| Instructions regarding water connections between the B.80 engine and radiator for the first Wraith 80 chassis. | 17th Mar 1939 | Box 124 \ 1 scan0046 | |
| Modification for stiffened tappet covers on the B.60 and experimental B.80 engines. | 17th Mar 1939 | Box 124 \ 1 scan0047 | |
| The exhaust valve guide and stem for the B.60 engine, suggesting component testing for comparison. | 18th Mar 1939 | Box 124 \ 1 scan0048 | |
| New parts and instructions for the Bentley 60 Chassis with a High Power Head. | 21th Mar 1939 | Box 124 \ 1 scan0049 | |
| Providing blueprints for the water connection on the first Bentley 80 in Wraith 80 chassis. | 21th Mar 1939 | Box 124 \ 1 scan0050 | |
| Instruction to manufacture 100 Thermo couple sets to a 2' overall length. | 23th Mar 1939 | Box 124 \ 1 scan0051 | |
| Modifications to the clutch and associated parts for the B.60 and B.80 chassis. | 24th Mar 1939 | Box 124 \ 1 scan0052 | |
| Requesting the dispatch of two 11' Long clutches for B.80 engines to B. & B. in Leamington Spa. | 24th Mar 1939 | Box 124 \ 1 scan0053 | |
| Letter to Borg & Beck Co. Ltd. regarding the supply and modification of clutches for experimental engines. | 24th Mar 1939 | Box 124 \ 1 scan0054 | |
| From RM/Swdl to HPS listing a series of outstanding jobs in order of urgency. | 27th Mar 1939 | Box 124 \ 1 scan0055 | |
| Problems of fitting a mechanical petrol pump to 8-cylinder engines. | 28th Mar 1939 | Box 124 \ 1 scan0056 | |
| Analysis of power loss and performance in various exhaust system configurations on a B.60 engine unit. | 29th Mar 1939 | Box 124 \ 1 scan0057 | |
| Comparison of power loss due to exhaust back pressure between a new B.60 engine unit and a conventional unit. | 29th Mar 1939 | Box 124 \ 1 scan0058 | |
| Performance graph analyzing various exhaust system configurations for a B60 engine. | 29th Mar 1939 | Box 124 \ 1 scan0059 | |
| Graph comparing percentage power loss versus exhaust back pressure for B60 and BV engines at a constant 4000 RPM. | 30th Mar 1939 | Box 124 \ 1 scan0060 | |
| General programme of development for the B.60 unit, detailing a series of investigations and tests. | 30th Mar 1939 | Box 124 \ 1 scan0061 | |
| List of investigation points for engine component and performance testing. | 30th Mar 1939 | Box 124 \ 1 scan0062 | |
| Comparison between hairpin type and helical valve springs. | 30th Mar 1939 | Box 124 \ 1 scan0063 | |
| Technical memorandum discussing the advantages of hairpin type valve springs over helical springs. | 30th Mar 1939 | Box 124 \ 1 scan0064 | |
| Instruction to build all 8-cylinder engines with a flexible flywheel and 11' Long clutch until further notice. | 1st Apr 1939 | Box 124 \ 1 scan0065 | |
| To Millwrights requesting the urgent installation of a B.60 engine into No.5 Test Bed. | 3rd Apr 1939 | Box 124 \ 1 scan0066 | |
| Modification to clutch to crankcase dowels on B.60 and B.80 chassis. | 6th Apr 1939 | Box 124 \ 1 scan0067 | |
| Requesting the completion of all patterns for the Conventional 8 engine. | 13th Apr 1939 | Box 124 \ 1 scan0068 | |
| Alteration to the specifications for B.60 engine camshafts. | 13th Apr 1939 | Box 124 \ 1 scan0069 | |
| Blueprints for parts to adapt a Buick type harmonic damper for the Bentley 80 chassis. | 13th Apr 1939 | Box 124 \ 1 scan0070 | |
| Crankshaft modification to enable a B.5 gearbox to be fitted to B.60 and B.80 engines. | 15th Apr 1939 | Box 124 \ 1 scan0071 | |
| Report comparing the performance of sodium-filled versus solid exhaust valves on B.80 and B.60 engines. | 21th Apr 1939 | Box 124 \ 1 scan0072 | |
| The effects of raised exhaust valve guides on valve head temperatures in a B.80 unit. | 21th Apr 1939 | Box 124 \ 1 scan0073 | |
| Trial of Nickel-Chrome-Molybdenum alloy exhaust valve seats for B.60 & B.80 units. | 22th Apr 1939 | Box 124 \ 1 scan0074 | |
| Torsional vibration tests conducted on a B.80 No.2 engine. | 22th Apr 1939 | Box 124 \ 1 scan0075 | |
| Inability to detect less important harmonics due to instrument accuracy limits. | 22th Apr 1939 | Box 124 \ 1 scan0076 | |
| Graph showing Summers torsiograph results for Engine B 80 Unit No 2 without a damper. | 22th Apr 1939 | Box 124 \ 1 scan0077 | |
| Torsional oscillation tests conducted on a B.80 No.3 engine with an increased diameter crankshaft. | 22th Apr 1939 | Box 124 \ 1 scan0078 | |
| Technical analysis of torsional rigidity and vibration in engine and chassis components. | 22th Apr 1939 | Box 124 \ 1 scan0079 | |
| Graph showing results of torsional oscillation tests on a B.80 No 3 engine with a 2.75 DIA shaft. | 28th Mar 1939 | Box 124 \ 1 scan0080 | |
| Graph showing the results of torsional oscillation tests on a B.80 No. 3 engine with a 2.75' diameter shaft, without a damper. | 28th Mar 1933 | Box 124 \ 1 scan0081 | |
| | | | |
