| Description | Date | Identifier | |
| Unequal cylinder liner distortion on the Phantom III engine and the proposed pattern alteration to correct it. | 9th Dec 1935 | Box 93 \ 4 scan0027 | |
| Transmittal note regarding drawings for the Phantom III - 4-Port Head. | 14th Dec 1935 | Box 93 \ 4 scan0028 | |
| Urgent request to order 48 'D' quality rubber rings from Goodrich Tyre Co. for the Phantom III Experimental Department. | 18th Dec 1935 | Box 93 \ 4 scan0029 | |
| Laboratory report comparing the oil and water resistance of two different rubber compositions for Phantom III cylinder liner sealing rings. | 24th Dec 1935 | Box 93 \ 4 scan0030 | |
| Laboratory report on oil absorption and thermal expansion tests for 'D' type rubber sealing rings for Ph.lll Cylinder Liners. | 15th Jan 1936 | Box 93 \ 4 scan0031 | |
| Issues with Phantom III Cylinder Liner Gland Rings, including incorrect volumes and new quality control procedures. | 15th Feb 1936 | Box 93 \ 4 scan0032 | |
| Investigation into high cylinder head water temperatures on Phantom III engines. | 29th Jun 1936 | Box 93 \ 4 scan0033 | |
| Various schemes tested to resolve water circulation issues in Bentley and 20/25 engines. | 29th Jun 1936 | Box 93 \ 4 scan0034 | |
| Conclusions regarding temperature differences in the water jackets of Phantom III cylinder heads. | 29th Jun 1936 | Box 93 \ 4 scan0035 | |
| Summary of design issues with the Ph.III cylinder head water-ways and proposals for redesign and further testing. | 29th Jun 1936 | Box 93 \ 4 scan0036 | |
| Sketch of modifications to water holes on PIII cylinder heads to improve coolant circulation. | 27th Jun 1936 | Box 93 \ 4 scan0037 | |
| Road test report comparing engine temperatures of different car configurations after a full throttle hill climb. | 27th Jun 1936 | Box 93 \ 4 scan0038 | |
| Table of temperature readings in degrees Celsius for Ph.III Cylinder Heads under various test conditions. | 27th Jun 1936 | Box 93 \ 4 scan0039 | |
| Diagram illustrating the arrangements of thermometers, thermocouples, and water passage blanking for tests on a Phantom III engine's circulation system. | 27th Jun 1936 | Box 93 \ 4 scan0040 | |
| Diagrams illustrating water passage and circulation arrangements for engine testing on the P. III. | 27th Jun 1936 | Box 93 \ 4 scan0041 | |
| Table of temperature readings in degrees Celsius taken at various points on a Phantom III cylinder head under different test conditions. | 27th Jun 1936 | Box 93 \ 4 scan0042 | |
| Diagrams showing arrangements of thermometers, thermo-couples and water passage blanking during 'B' series of tests on Phantom III circulation. | 27th Jun 1936 | Box 93 \ 4 scan0043 | |
| Diagrams showing the arrangement of water holes and passage blanking for 'B' Series tests on a Phantom III experimental test bed. | 4th Jul 1936 | Box 93 \ 4 scan0044 | |
| Water circulation issues on Phantom III production engines causing delays in unit testing. | 4th Jul 1936 | Box 93 \ 4 scan0045 | |
| Cover letter for corrected prints of a report on Phantom III engine cylinder head water temperatures. | 7th Jul 1936 | Box 93 \ 4 scan0046 | |
| Blueprint showing the arrangement of thermometers, thermo-couples, and water passage blanking for tests on a PIII circulation unit. | 7th Jul 1936 | Box 93 \ 4 scan0047 | |
| Diagrams of water passage arrangements for 'A' series of tests on a P. III circulation unit. | 7th Jul 1936 | Box 93 \ 4 scan0048 | |
| Diagrams showing the arrangement of thermometers, thermo-couples, and water passage blanking for 'B' series tests on Phantom III circulation. | 7th Jul 1936 | Box 93 \ 4 scan0049 | |
| Diagrams of water hole arrangements and circulation for 'B' Series of Tests on an experimental test bed. | 6th Jul 1936 | Box 93 \ 4 scan0050 | |
| Proposal regarding plugging holes in the Phantom III cylinder head to avoid scrapping expensive units. | 6th Jul 1936 | Box 93 \ 4 scan0051 | |
| Urgent request to experiment with bulged covers for the Phantom III cylinder head to improve water circulation. | 10th Jul 1936 | Box 93 \ 4 scan0052 | |
| Potential engine modifications to reduce oil temperature and improve filtration to combat cylinder bore wear. | 16th Jul 1936 | Box 93 \ 4 scan0053 | |
| The waterways of Phantom III cylinder heads, comparing two examples with different temperature differentials. | 4th Aug 1936 | Box 93 \ 4 scan0054 | |
| The comparison of waterways in Bentley and Phantom III cylinder heads and proposed modifications. | 4th Aug 1936 | Box 93 \ 4 scan0055 | |
| Two photographs showing cross-sections of an engine cylinder block. | 4th Aug 1936 | Box 93 \ 4 scan0056 | |
| Cross-section photograph of a cast engine cylinder block. | 4th Aug 1936 | Box 93 \ 4 scan0057 | |
| Sketch showing transverse waterways on Phantom III and Bentley cylinder heads. | 6th Aug 1936 | Box 93 \ 4 scan0058 | |
| Letter to a supplier requesting modified gaskets to resolve a preignition issue. | 6th Aug 1936 | Box 93 \ 4 scan0059 | |
| Confirming an order for 3-ply corrujoint cylinder head gaskets from The Southwark Manufacturing Co. | 6th Aug 1936 | Box 93 \ 4 scan0060 | |
| Three proposed treatments to remedy corrosion in aluminium water jackets on Phantom III engines. | 14th Aug 1936 | Box 93 \ 4 scan0061 | |
| Request to detail alterations for producing the Phantom III Hot Spot in Aluminium for trial. | 12th Aug 1936 | Box 93 \ 4 scan0062 | |
| Cost investigation and proposal for manufacturing cylinder liners in-house for the Phantom III engine. | 18th Sep 1936 | Box 93 \ 4 scan0063 | |
| Testing plain cast iron cylinder liners for the Phantom III engine to address distortion issues. | 21th Sep 1936 | Box 93 \ 4 scan0064 | |
| Two proposed treatments to prevent corrosion in the aluminium water jackets of the Phantom III engine. | 24th Sep 1936 | Box 93 \ 4 scan0065 | |
| Request for a specially cast Phantom III cylinder head to test heat transfer from the exhaust ports. | 24th Sep 1936 | Box 93 \ 4 scan0066 | |
| Instructions to remove 4 port cylinder heads from test bed engine No. 8 and fit them into 32-EX chassis for the Phantom III. | 3rd Oct 1936 | Box 93 \ 4 scan0067 | |
| Request for records of cylinder bore wear on Phantom III's that have undergone endurance tests. | 6th Oct 1936 | Box 93 \ 4 scan0068 | |
| Instruction concerning a modified exhaust valve and material trials for the Phantom III 4 Port Cylinder Head. | 6th Oct 1936 | Box 93 \ 4 scan0069 | |
| Design modifications for the Phantom III engine's water heated hot spots. | 7th Oct 1936 | Box 93 \ 4 scan0070 | |
| Testing a new bulged cylinder head end cover (Scheme Lec.5200) to improve cooling on the Phantom III engine. | 14th Oct 1936 | Box 93 \ 4 scan0071 | |
| Conclusion on the effectiveness of new end covers based on temperature readings. | 14th Oct 1936 | Box 93 \ 4 scan0072 | |
| Instruction to modify a pair of 4-port heads for a Phantom III, including deturbulating and restoring the standard compression ratio. | 14th Oct 1936 | Box 93 \ 4 scan0073 | |
| Instructions to build a test rig for the Phantom III to test a longitudinal cylinder head water flow configuration. | 20th Oct 1936 | Box 93 \ 4 scan0074 | |
| Modifications to a Phantom III deturbulated cylinder head by removing lips. | 26th Oct 1936 | Box 93 \ 4 scan0075 | |
| The testing of a four port head on car 32-EX, focusing on water loss and temperature difference. | 5th Nov 1936 | Box 93 \ 4 scan0076 | |
| Comparison of a 4-port cylinder head versus a standard 6-port head on the Phantom III engine. | 5th Nov 1936 | Box 93 \ 4 scan0077 | |
| Engine head performance, comparing induction, valve sizes, and testing for Continental Units. | 7th Oct 1936 | Box 93 \ 4 scan0078 | |
| Phantom III power comparison graph contrasting the performance of 4-port and standard 6-port cylinder heads. | 7th Oct 1936 | Box 93 \ 4 scan0079 | |
| History and development of an improved Phantom III cylinder head. | 6th Nov 1936 | Box 93 \ 4 scan0080 | |
| Performance test of a four-port cylinder head on car 32-EX, focusing on water loss and temperature difference. | 5th Nov 1936 | Box 93 \ 4 scan0081 | |
| Comparison of 4 port and standard 6 port head on Phantom III. | 5th Nov 1936 | Box 93 \ 4 scan0082 | |
| Development and testing of engine heads for the 'Continental Units', comparing valve sizes and performance. | 7th Oct 1936 | Box 93 \ 4 scan0083 | |
| Power comparison graph for the Phantom III engine, comparing 4-port and 6-port cylinder heads. | 7th Oct 1936 | Box 93 \ 4 scan0084 | |
| Modification to the Phantom III combined crankcase cylinder block to facilitate the production of cylinder liners. | 16th Nov 1936 | Box 93 \ 4 scan0085 | |
| Suggested modification to the Phantom III cylinder liner and crankcase. | 18th Nov 1936 | Box 93 \ 4 scan0086 | |
| Recommendation to alter the thickness of the 4 Port Induction System pipes for the Phantom III model. | 17th Nov 1936 | Box 93 \ 4 scan0087 | |
| Requesting better inter-departmental cooperation on experimental designs, citing cylinder head modifications as examples. | 18th Nov 1936 | Box 93 \ 4 scan0088 | |
| The cost of Phantom III cylinder liners and the search for more durable materials. | 27th Nov 1936 | Box 93 \ 4 scan0089 | |
| Cost savings and performance issues of a four-port cylinder head compared to a six-port one for the Phantom III engine. | 26th Nov 1936 | Box 93 \ 4 scan0090 | |
| Pair of 4 port heads and a pair of deturbulated and modified heads for a Phantom III. | 30th Nov 1936 | Box 93 \ 4 scan0091 | |
| Experimental design for Phantom III cylinder liners using rubber rings. | 4th Dec 1936 | Box 93 \ 4 scan0092 | |
| Blueprint for a rubber joint ring and liner top flange, designated PH III. | 7th Dec 1936 | Box 93 \ 4 scan0093 | |
| Design of the 4 Port Induction Pipe for the Phantom III, specifically regarding the water feed and jacket. | 17th Dec 1936 | Box 93 \ 4 scan0094 | |
| Design of a 4-port induction pipe for the Phantom III, specifically regarding the water feed and jacket. | 17th Dec 1936 | Box 93 \ 4 scan0095 | |
| Modifications to the Four Port Head for the Phantom III cylinder head. | 18th Dec 1936 | Box 93 \ 4 scan0096 | |
| Modifications to the Four Port Head for the Phantom III, specifically regarding the water heated induction system. | 18th Dec 1936 | Box 93 \ 4 scan0097 | |
| Cost-saving modification to the Phantom III water connections. | 9th Jan 1937 | Box 93 \ 4 scan0098 | |
| The production schedule for the Phantom III four-port cylinder head. | 11th Jan 1937 | Box 93 \ 4 scan0099 | |
| Modifications to the Phantom III Induction Pipe Heater casting to reduce weight and cost. | 13th Jan 1937 | Box 93 \ 4 scan0100 | |
| Modifications to the Phantom III induction system's hot box due to a change in material. | 13th Jan 1937 | Box 93 \ 4 scan0101 | |
| Standardisation of the Phantom III four-port cylinder head. | 19th Jan 1937 | Box 93 \ 4 scan0102 | |
| Problems with a 4-port cylinder head, particularly the inefficiency of the exhaust silencer. | 20th Jan 1937 | Box 93 \ 4 scan0103 | |
| Requesting the fitting of special Copper and Asbestos cylinder head gaskets to two Phantom III units. | 26th Jan 1937 | Box 93 \ 4 scan0104 | |
| Modifications to the Phantom III 4 Port Head to accommodate different types of rockers and tappets. | 10th Feb 1937 | Box 93 \ 4 scan0105 | |
| Confirming a verbal request to modify the Phantom III 4 Port Head to accommodate different tappets or rockers. | 10th Feb 1937 | Box 93 \ 4 scan0106 | |
| Performance improvements and depression figures for the Phantom III induction system. | 24th Feb 1937 | Box 93 \ 4 scan0107 | |
| Experiments to reduce gas flow restriction in a hot-spot by introducing a vane and modifying the carburettor. | 24th Feb 1937 | Box 93 \ 4 scan0108 | |
| Comparing Phantom III and Merlin engine exhaust valve seats, suggesting design changes. | 26th Feb 1937 | Box 93 \ 4 scan0109 | |
| Trial order of 20 cylinder liners from the British Piston Ring Co. and potential cost savings. | 2nd Mar 1937 | Box 93 \ 4 scan0110 | |
| The issuance of blueprints for Phantom III Chassis Cylinder Head Drain Pipes. | 11th Mar 1937 | Box 93 \ 4 scan0111 | |
| Request to alter a dimension on Drawing E88926/7 for the Phantom III Oil Drain in the Cylinder Head. | 12th Mar 1937 | Box 93 \ 4 scan0112 | |
| Modification notice for the Phantom III regarding cylinder head oil drainage. | 22th Mar 1937 | Box 93 \ 4 scan0113 | |
| Altering the exhaust manifold studs on the Phantom III cylinder head to a different material. | 22th Mar 1937 | Box 93 \ 4 scan0114 | |
| Modification to water pipes to clear petrol pipes on a Four Port Head. | 2nd Jun 1937 | Box 93 \ 4 scan0115 | |
| Urgent memo regarding the completion of modified 4 port heads with hydraulic tappets for the Phantom III. | 4th Jun 1937 | Box 93 \ 4 scan0116 | |
| Standardisation of a 4 port cylinder head for the Phantom III. | 9th Jun 1937 | Box 93 \ 4 scan0117 | |
| Estimation of new tool costs and production schedule for a component in the 'D' Series chassis. | 18th Sep 1928 | Box 93 \ 4 scan0118 | |
| Specification for the standardisation of a 4 port head. | 2nd Mar 1937 | Box 93 \ 4 scan0119 | |
| Hold-up on work for the Phantom III chassis cylinder head and valves. | 27th Jul 1937 | Box 93 \ 4 scan0120 | |
| Design improvements to the Phantom III 'D' Series cylinder head and a hold on production for specific parts. | 28th Sep 1937 | Box 93 \ 4 scan0121 | |
| Revisions to the Phantom III four-inlet port cylinder head. | 30th Sep 1937 | Box 93 \ 4 scan0122 | |
| Modification proposal for the Phantom III four-inlet port cylinder head concerning an additional water communication hole. | 2nd Oct 1937 | Box 93 \ 4 scan0123 | |
| Modifications to the Phantom III 'D' Series four-port cylinder head and testing requirements. | 4th Oct 1937 | Box 93 \ 4 scan0124 | |
| The continued use of the original four-port cylinder head for the Phantom III 'D' Series. | 5th Oct 1937 | Box 93 \ 4 scan0125 | |
| Modifications for Ph.III valve seat inserts for exhaust and inlet seats. | 15th Oct 1937 | Box 93 \ 4 scan0126 | |
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