| Description | Date | Identifier | |
| 8-weight balance scheme for the Phantom II crankshaft. | 1st May 1933 | Box 14 \ 2 Scan155 | |
| Improvement to the crankshaft oil cap studs for the Phantom II, Bentley, and 20/25 HP models. | 30th May 1933 | Box 14 \ 2 Scan156 | |
| Requesting particulars about 40/50 HP engines used in tanks. | 23th Aug 1933 | Box 14 \ 2 Scan157 | |
| Data on the latest type Phantom II engines with balanced crankshafts for 40/50 engines in tanks. | 24th Aug 1933 | Box 14 \ 2 Scan158 | |
| Requesting further figures for a left-hand Phantom II engine crankshaft without balance weights for use in tanks. | 28th Aug 1933 | Box 14 \ 2 Scan159 | |
| That balance weights be forged solid with the crankshaft. | 31th Aug 1933 | Box 14 \ 2 Scan160 | |
| Providing revised figures for the inertia and natural frequency of 40/50 engines intended for use in tanks. | 1st Sep 1933 | Box 14 \ 2 Scan161 | |
| Balance weight failures on a Bentley engine and the challenges of making them solid with the crankshaft. | 1st Sep 1933 | Box 14 \ 2 Scan162 | |
| Crankshaft drawings and balance weights for Phantom, Bentley, and 20/25 HP models. | 19th Mar 1934 | Box 14 \ 2 Scan163 | |
| Standardisation of parts for a modification to balance weight studs. | 18th Jun 1934 | Box 14 \ 2 Scan164 | |
| The standardisation of parts, specifically a modification to a balance weight, including cost estimates. | 1st Sep 1940 | Box 14 \ 2 Scan165 | |
| Production timeline for a Phantom engine with a new aluminum head and an EAC-V11 chassis. | 30th Aug 1926 | Box 14 \ 3 Scan001 | |
| Development of a revised engine with different cylinder block configurations. | 24th May 1927 | Box 14 \ 3 Scan002 | |
| Instruction to fit a set of anti-distortion packings to 12-EX cylinder blocks during erection. | 17th Aug 1927 | Box 14 \ 3 Scan003 | |
| Design of an induction pipe and port arrangement, comparing 4-port and 6-port systems. | 17th Jan 1928 | Box 14 \ 3 Scan004 | |
| Note discussing the application of an undertype slot for 4 or 6 port induction pipes, referencing a blueprint. | 22th Feb 1928 | Box 14 \ 3 Scan005 | |
| Blueprint for a cylinder head, its valve passages, and valve rocker layout. | 22th Feb 1928 | Box 14 \ 3 Scan006 | |
| Design of exhaust and inlet valve guides for a Phantom aluminium head. | 23th Mar 1928 | Box 14 \ 3 Scan007 | |
| Scheme to adapt an inlet pipe and cylinder head for a new type of carburetor. | 24th Mar 1928 | Box 14 \ 3 Scan008 | |
| Modification to an induction pipe and cylinder head. | 1st Mar 1928 | Box 14 \ 3 Scan009 | |
| Standardisation of a cylinder head complete with double valve springs to reduce detonation. | 23th Mar 1928 | Box 14 \ 3 Scan010 | |
| The implementation costs and test date for fitting a new part to a chassis. | 9th Jun 1928 | Box 14 \ 3 Scan011 | |
| Suggesting the addition of nickel and chromium to iron castings to increase their strength for car parts. | 23th May 1928 | Box 14 \ 3 Scan012 | |
| Production difficulties with Phantom induction pipes and engine tappet clearance issues. | 30th May 1928 | Box 14 \ 3 Scan013 | |
| The ignition timing setting for the turbulent head. | 31th May 1928 | Box 14 \ 3 Scan014 | |
| The tappet push rod fouling the cylinder block on F.2.B. Chassis engines. | 28th Jun 1928 | Box 14 \ 3 Scan015 | |
| The properties, casting difficulties, and potential uses of Mr. Hall's light alloy. | 20th Aug 1928 | Box 14 \ 3 Scan016 | |
| Alterations for induction pipes, comparing an exhaust heated jacket with a water heated scheme. | 12th Sep 1928 | Box 14 \ 3 Scan017 | |
| Results of experiments with nickel and nickel-chrome alloys in iron castings. | 26th Sep 1928 | Box 14 \ 3 Scan018 | |
| Reduction of silicon and phosphorus content for further experimental work. | 26th Sep 1928 | Box 14 \ 3 Scan019 | |
| Requesting further special cylinder heads to address a metallic clicking issue which a previous modification failed to solve. | 12th Sep 1928 | Box 14 \ 3 Scan020 | |
| Confirmation request for a portion of an SS cylinder head to be used for gas flow tests. | 26th Oct 1928 | Box 14 \ 3 Scan021 | |
| Request to supply a piece of lead with specified dimensions for the 'cast iron aluminium head controversy'. | 1st Nov 1928 | Box 14 \ 3 Scan022 | |
| From a non-technical employee asking for a simplified explanation of the advantages of a 'turbulent head' for sales purposes. | 1st Nov 1928 | Box 14 \ 3 Scan023 | |
| The performance and characteristics of the turbulent head engine component. | 26th Nov 1928 | Box 14 \ 3 Scan024 | |
| Improvements of a new engine head design over an obsolete one, focusing on self-ignition, silencer firing, and detonation. | 26th Nov 1928 | Box 14 \ 3 Scan025 | |
| Request to order half a dozen experimental gaskets using aluminium sheets and soft steel. | 13th Dec 1928 | Box 14 \ 3 Scan026 | |
| Engine damage caused by carburetter air valve penny pin failure, with a recommendation to revert to a previous pin design. | 1st Mar 1929 | Box 14 \ 3 Scan027 | |
| Design changes and material testing for an 'SS' Exhaust Manifold. | 29th Jan 1929 | Box 14 \ 3 Scan028 | |
| With sketches comparing two parts and their chassis applicability. | 29th Jan 1929 | Box 14 \ 3 Scan029 | |
| Cylinder and piston lubrication, particularly the risks during cold starts and comparing different engine models. | 29th Jan 1929 | Box 14 \ 3 Scan030 | |
| Oil leaks, fastening issues, and potential design modifications for the 'SS' Valve Rocker Cover. | 2nd Feb 1929 | Box 14 \ 3 Scan031 | |
| Alternative materials for Gasket E. 77361, comparing aluminium, steel, and brass combinations. | 12th Feb 1929 | Box 14 \ 3 Scan032 | |
| Requesting details be added to sketches for lubrication on start-up, using existing part E.17144. | 1st Jun 1929 | Box 14 \ 3 Scan033 | |
| The testing of an extra cylinder lubrication system, scheme Hs.222. | 19th Jul 1929 | Box 14 \ 3 Scan034 | |
| Test report on oil pressure, jet performance, and oil types under various temperatures and conditions. | 20th Jul 1929 | Box 14 \ 3 Scan035 | |
| Schematic diagram showing the layout of a testing apparatus for extra cylinder lubrication. | 20th Jul 1929 | Box 14 \ 3 Scan036 | |
| Request to instruct the production of six sets of copper tubes for SS aluminium cylinder heads to test for corrosion. | 2nd Jul 1929 | Box 14 \ 3 Scan037 | |
| Difficulties and a proposed scheme for extra cylinder lubrication. | 3rd Sep 1929 | Box 14 \ 3 Scan038 | |
| Second page of a memorandum noting the attachment of a sketch. | 13th Sep 1929 | Box 14 \ 3 Scan039 | |
| Delayed examination of a modified cylinder head on chassis No. 97-KR. | 13th Sep 1929 | Box 14 \ 3 Scan040 | |
| Private memorandum discussing recent troubles with aluminium heads and a suggested solution. | 30th Sep 1929 | Box 14 \ 3 Scan041 | |
| Radiator filter designed for collecting sediment from the cylinder block. | 14th Oct 1929 | Box 14 \ 3 Scan042 | |
| Adopting a method of heating Phantom II cylinders to form a protective skin against corrosion. | 28th Oct 1929 | Box 14 \ 3 Scan043 | |
| Heat treatment process to protect Phantom cylinders from corrosion and requesting hardness tests. | 29th Oct 1929 | Box 14 \ 3 Scan044 | |
| Report on the use of aluminium cylinder heads, referencing the experience of the Mack Truck Co. | 1st Nov 1929 | Box 14 \ 3 Scan045 | |
| Issues with aluminum cylinder heads based on the experience of a Mack Truck Service Station. | 25th Sep 1929 | Box 14 \ 3 Scan046 | |
| Report discussing performance issues with aluminum components compared to cast iron. | 27th Dec 1929 | Box 14 \ 3 Scan047 | |
| Corroded aluminium tubes in a Phantom cylinder head and the proposed solution of anodically treating them. | 27th Dec 1929 | Box 14 \ 3 Scan048 | |
| Preliminary tests for providing extra oil to cylinders. | 8th Jan 1930 | Box 14 \ 3 Scan049 | |
| Test report on an extra cylinder lubrication oiling scheme, detailing oil distribution results. | 9th Jan 1930 | Box 14 \ 3 Scan050 | |
| Further tests for ensuring lubrication of the whole piston skirt. | 10th Jan 1930 | Box 14 \ 3 Scan051 | |
| Request to fit an oil pump and pipes to an engine for crankshaft lubrication. | 10th Jan 1930 | Box 14 \ 3 Scan052 | |
| On tests for extra cylinder lubrication, recommending an 'off-centre' oil feed method for better distribution. | 3rd Feb 1930 | Box 14 \ 3 Scan053 | |
| Recommendation to add bosses to crankcase castings for a scheme to supply extra oil to the cylinders. | 4th May 1913 | Box 14 \ 3 Scan054 | |
| Request for the inspection of corrosion on nickel-coated copper tubes within a cylinder head after steam treatment. | 17th Mar 1930 | Box 14 \ 3 Scan055 | |
| Depot sheet regarding the corrosion of aluminium cylinder head tubes and the introduction of Nickel plated Copper replacements. | 21th Mar 1930 | Box 14 \ 3 Scan056 | |
| Standardisation report for replacing aluminium cylinder head tubes with nickel-coated copper tubes to prevent corrosion. | 24th Mar 1930 | Box 14 \ 3 Scan057 | |
| Standardisation of chassis parts for extra cylinder lubrication. | 3rd Jun 1930 | Box 14 \ 3 Scan058 | |
| Modifications to raise the compression ratio of a 40/50 engine. | 10th Jan 1931 | Box 14 \ 3 Scan059 | |
| Blueprint detailing a modification to a Phantom II cylinder head to raise the compression ratio. | 10th Jan 1931 | Box 14 \ 3 Scan060 | |
| Requesting urgent work on a Phantom Cylinder head for No. 5 Test. | 21th Apr 1931 | Box 14 \ 3 Scan061 | |
| Instructions for alterations to a Phantom II cylinder head and the provision of special pistons for testing. | 28th Apr 1931 | Box 14 \ 3 Scan062 | |
| Clarifying that no modifications have been made to the Phantom II cylinder head. | 18th Jul 1931 | Box 14 \ 3 Scan063 | |
| From 'E' clarifying that a proposal to use a cylinder head without lips only applied to lower compression. | 20th Jul 1931 | Box 14 \ 3 Scan064 | |
| Instructions and blueprint list for a 40/50 HP Chassis cylinder, valves, and fittings experiment. | 18th Aug 1931 | Box 14 \ 3 Scan065 | |
| Request to modify a Phantom II cylinder head for small 30° valves and high lift rockers. | 21th Aug 1931 | Box 14 \ 3 Scan066 | |
| Blueprints for E.82168 and E.82455 compression ratio heads and the difficulties of achieving higher compression ratios. | 22th Sep 1931 | Box 14 \ 3 Scan067 | |
| Policy document detailing the use of high compression heads on right-hand and left-hand drive Phantom II chassis. | 1st Oct 1931 | Box 14 \ 3 Scan068 | |
| Standardisation of a 5:1 compression ratio cylinder head for increased car performance. | 26th Sep 1931 | Box 14 \ 3 Scan069 | |
| Standardization of chassis parts document detailing costs and implementation. | 23th Oct 1921 | Box 14 \ 3 Scan070 | |
| Suggestion, costs, and benefits of using Austenitic nitro-hardened steel for car cylinder liners. | 28th Sep 1931 | Box 14 \ 3 Scan071 | |
| Work request memo for modifications to a Phantom II cylinder head. | 13th Nov 1931 | Box 14 \ 3 Scan072 | |
| Test results on a higher compression 40/50 cylinder head, comparing twin choke and single expanding carburetters. | 8th Dec 1931 | Box 14 \ 3 Scan073 | |
| Performance graph comparing two different engine compression ratios. | 2nd Dec 1931 | Box 14 \ 3 Scan074 | |
| Blank page marked with a date stamp from the Derby location. | 9th Dec 1931 | Box 14 \ 3 Scan075 | |
| Graph comparing engine performance (BHP, BMEP, Induction Depression) against RPM for two different compression ratios. | 8th Dec 1931 | Box 14 \ 3 Scan076 | |
| Heavily faded document, possibly a cover sheet, marked with a purple date stamp. | 9th Dec 1931 | Box 14 \ 3 Scan077 | |
| Drawing showing three sectional views of a crankcase or cylinder block. | 18th Jul 1917 | Box 14 \ 3 Scan078 | |
| Modifications to cast iron cylinder head E.56604 to increase the compression ratio. | 9th Dec 1931 | Box 14 \ 3 Scan079 | |
| Confirming a request to test the fitment of exhaust valves into a Phantom II cylinder head. | 20th Jun 1932 | Box 14 \ 3 Scan080 | |
| Testing of a 5 1/2 to 1 compression ratio cylinder head on the 19-EX Phantom II. | 6th Aug 1932 | Box 14 \ 3 Scan081 | |
| Standardisation of a 5-1 cylinder head for a standard chassis. | 9th Jun 1932 | Box 14 \ 3 Scan082 | |
| Standardisation of chassis parts form detailing costs and the first chassis to be fitted. | 9th Jun 1932 | Box 14 \ 3 Scan083 | |
| Standardisation of a 5.25 C/R cylinder head to improve the continental chassis. | 9th Jun 1932 | Box 14 \ 3 Scan084 | |
| Introduction of a new standardized chassis part. | 15th Oct 1934 | Box 14 \ 3 Scan085 | |
| Incorrect combustion chamber capacity on a Phantom II cylinder head, investigating the cause and requesting an urgent alteration. | 24th May 1933 | Box 14 \ 3 Scan086 | |
| Instruction to re-fit a Phantom II Cylinder Head with original valve springs and guides before re-assembly. | 9th Aug 1933 | Box 14 \ 3 Scan087 | |
| Returning a damaged Phantom II No. 27 unit due to a sheared exhaust valve and subsequent damage. | 29th Aug 1933 | Box 14 \ 3 Scan088 | |
| Instructions for modifications to a Phantom head to create a high compression, large valve version. | 29th Aug 1933 | Box 14 \ 3 Scan089 | |
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