| Description | Date | Identifier | |
| Comparison table of valve clearance increases for various materials at 80°C. | 23th Apr 1926 | Box 66a \ 2 scan0028 | |
| Use of duralumin for larger diameter valve push rods and parallel guide tubes for the lighter Phantom engine. | 23th Apr 1926 | Box 66a \ 2 scan0029 | |
| Benefits of a water-heated throttle over a valve in the exhaust pipe and suggesting further tests. | 11th Jun 1926 | Box 66a \ 2 scan0030 | |
| Potential modifications to a water-heated throttle system. | 12th Jun 1926 | Box 66a \ 2 scan0031 | |
| Requesting 'Ochromite' Phantom exhaust valves for an experiment to improve heat conductivity and prevent self-ignition. | 25th Jun 1926 | Box 66a \ 2 scan0032 | |
| Proposal to test a longer copper valve guide with an umbrella valve to cure self-ignition on the Phantom. | 25th Jun 1926 | Box 66a \ 2 scan0033 | |
| Alternative designs for a Lighter Phantom Engine valve rocker cover. | 6th Jul 1926 | Box 66a \ 2 scan0034 | |
| Experiment observing the rotation of valves on Phantom and 20 HP engines to investigate valve seat erosion. | 8th Aug 1926 | Box 66a \ 2 scan0035 | |
| Technical memorandum discussing valve movement, potential erosion, and methods to prevent valve rotation. | 19th Aug 1926 | Box 66a \ 2 scan0036 | |
| Use of aluminium bronze for valve seats and associated design precautions. | 25th Sep 1926 | Box 66a \ 2 scan0037 | |
| Properties of aluminium bronze for inserted valve seats, referencing an S.A.E. journal. | 27th Sep 1926 | Box 66a \ 2 scan0038 | |
| Valve timing and induction system improvements for the Aluminium Phantom engine. | 9th Oct 1926 | Box 66a \ 2 scan0039 | |
| Alterations to aero engine parts, specifically solid key type bottom tappets to make them quieter. | 24th Sep 1926 | Box 66a \ 2 scan0040 | |
| Test report on the performance of a set of tappets fitted to car 12-EX after a 10,000 mile test run. | 5th Oct 1926 | Box 66a \ 2 scan0041 | |
| Cost analysis for a standardisation sheet concerning new and old tappets. | 5th Oct 1926 | Box 66a \ 2 scan0042 | |
| Requesting better Mean Effective Pressure and suitable valve springs for 20 HP and 40/50 engines. | 1st Nov 1926 | Box 66a \ 2 scan0043 | |
| Improved valve springs, suggesting testing them and halting production of the older, weaker versions. | 23th Feb 1927 | Box 66a \ 2 scan0044 | |
| Investigation into the causes and solutions for noisy tappets on Phantom and 20 HP cars. | 8th Apr 1927 | Box 66a \ 2 scan0045 | |
| Design study for a modified valve rocker raised by .125 inches for a Phantom II engine. | 14th Apr 1927 | Box 66a \ 2 scan0046 | |
| Phantom tappet noises and the effectiveness of rocker alterations in reducing valve noise. | 16th Apr 1927 | Box 66a \ 2 scan0047 | |
| Different valve timing for the Sports Phantom to improve high-speed output, based on a comparison with Lorraine engines. | 23th Apr 1927 | Box 66a \ 2 scan0048 | |
| Query about the possibility of removing felt glands on valve gear to allow for the adoption of double valve springs. | 23th Apr 1927 | Box 66a \ 2 scan0049 | |
| Test report on the value of felt glands on Phantom engine valves, focusing on oil consumption and smoke emission. | 28th Apr 1927 | Box 66a \ 2 scan0050 | |
| Long-term effectiveness of felt glands on valves and proposing a design alternative to reduce oil consumption. | 30th Apr 1927 | Box 66a \ 2 scan0051 | |
| Experiment to modify the Phantom valve rocker gear to test the effect on valve seating noise. | 30th Apr 1927 | Box 66a \ 2 scan0052 | |
| Valve spring trouble for Condor and Phantom engines, proposing a new design and a formula for reliability. | 11th Jul 1927 | Box 66a \ 2 scan0053 | |
| Use of longer inlet cams and the performance of different valve springs for various engines. | 13th Aug 1927 | Box 66a \ 2 scan0054 | |
| Modified duralumin push rod for the Phantom valve gear, proposing two schemes. | 24th Aug 1927 | Box 66a \ 2 scan0055 | |
| Sending drawings with information for the Phantom Sports Engine's crankcase, cylinder blocks, and valve gear. | 31th Aug 1927 | Box 66a \ 2 scan0056 | |
| Potential inlet air noise issue with experimental Phantom and 20 HP engines. | 1st Sep 1927 | Box 66a \ 2 scan0057 | |
| Modifications to the Phantom cylinder block, valve gear, and wheelcase for sports chassis. | 9th Sep 1927 | Box 66a \ 2 scan0058 | |
| Confirming the dispatch of drawing LeC.2479 for double valve springs for the final Sports Phantom. | 22th Oct 1927 | Box 66a \ 2 scan0059 | |
| Stating it is unnecessary to experiment with valve spring material on customer cars. | 29th Oct 1927 | Box 66a \ 2 scan0060 | |
| Trial of Elektron valve covers for the Phantom. | 8th Nov 1927 | Box 66a \ 2 scan0061 | |
| Proposed modifications for Phantom engine power development. | 28th Nov 1927 | Box 66a \ 2 scan0062 | |
| Updates and changes to Sports' Phantom valves, springs, and fittings. | 23th Nov 1927 | Box 66a \ 2 scan0063 | |
| Valve lift diagrams and clearances for car and aero engines, with a hand-drawn diagram. | 17th Jan 1928 | Box 66a \ 2 scan0064 | |
| Query regarding modifications made to Phantom valve springs due to insufficient coil clearance. | 2nd Feb 1928 | Box 66a \ 2 scan0065 | |
| Calculations and modifications for Phantom valve springs. | 24th Feb 1928 | Box 66a \ 2 scan0066 | |
| Confirming the valve sizes for the 20 HP and Phantom models. | 9th Mar 1928 | Box 66a \ 2 scan0067 | |
| The improved geometry of valve gear rockers for the Phantom and 20 HP models. | 13th Mar 1928 | Box 66a \ 2 scan0068 | |
| Modified rocker angle for the sports Phantom, with a diagram of eccentric thrust. | 23th Mar 1928 | Box 66a \ 2 scan0069 | |
| Design of exhaust and inlet valve guides for the Phantom Aluminium Head. | 23th Mar 1928 | Box 66a \ 2 scan0070 | |
| Requesting the production of one set of an adapter for a Phantom Chassis valve experiment. | 4th Apr 1928 | Box 66a \ 2 scan0071 | |
| Brief memo regarding the satisfactory state of the SS Engine Valve Gear. | 4th Apr 1928 | Box 66a \ 2 scan0072 | |
| Recommendation to redesign a tool for removing valve springs. | 17th Apr 1928 | Box 66a \ 2 scan0073 | |
| Phantom engine valve stretching, comparing different steel types and proposing design improvements. | 25th Apr 1928 | Box 66a \ 2 scan0074 | |
| Page from a document discussing standard material and shock loads on valve stems for car and aero engines. | 26th Apr 1928 | Box 66a \ 2 scan0075 | |
| Modifications to Phantom valves, specifically increasing the stem diameter. | 26th Apr 1928 | Box 66a \ 2 scan0076 | |
| Laboratory memo regarding the high silicon content found in stretched Phantom valves. | 5th May 1928 | Box 66a \ 2 scan0077 | |
| Phantom valve stretching, attributing the issue to high silicon content and proposing solutions. | 7th May 1928 | Box 66a \ 2 scan0078 | |
| Phantom engine valve springs, comparing standard single type to double springs which cause a clicking noise. | 11th May 1928 | Box 66a \ 2 scan0079 | |
| The performance and characteristics of Phantom double valve springs, comparing them to standard single springs. | 11th May 1928 | Box 66a \ 2 scan0080 | |
| Investigation into a high-pitched clicking noise from the valve gear at 1250 r.p.m. on experimental cars. | 19th May 1928 | Box 66a \ 2 scan0081 | |
| Valve clearance measurements with an aluminium head for a Phantom engine. | 19th May 1928 | Box 66a \ 2 scan0082 | |
| Reminder to supply figures for tappet clearance variations on Phantom engines. | 9th May 1928 | Box 66a \ 2 scan0083 | |
| Test for noisy valves caused by cylinder head distortion. | 21th May 1928 | Box 66a \ 2 scan0084 | |
| Confirming valve guide clearances for turbulent heads to eliminate valve clicking. | 23th May 1928 | Box 66a \ 2 scan0085 | |
| Comparative study on valve stretching for four different steel materials under specified load and temperature conditions. | 4th Jun 1928 | Box 66a \ 2 scan0086 | |
| Testing of various valve steels. | 11th Jun 1928 | Box 66a \ 2 scan0087 | |
| On test results finding K.E.965 austenitic steel a satisfactory alternative for silchrome in valves. | 15th Jun 1928 | Box 66a \ 2 scan0088 | |
| Instructions for setting the valve clearance on a Phantom engine with an aluminium head. | 25th Jun 1928 | Box 66a \ 2 scan0089 | |
| Issues with Phantom rocker brackets due to uneven material expansion and suggesting a return to all-steel brackets. | 12th Jul 1928 | Box 66a \ 2 scan0090 | |
| Valve clearance issues caused by cylinder gasket settling, with recommendations for gasket reuse. | 10th Oct 1928 | Box 66a \ 2 scan0091 | |
| The cause and remedy for an elusive squeak on the Phantom chassis, originating from the oil pump system. | 22th Oct 1928 | Box 66a \ 2 scan0092 | |
| Cablegram from Springfield, Massachusetts to Derby requesting information on air valve operation at full throttle. | 23th Nov 1928 | Box 66a \ 2 scan0093 | |
| Response to a cabled query about the engine speed at which the air valve commences to lift. | 1st Dec 1928 | Box 66a \ 2 scan0094 | |
| Letter discussing the issue of valves dropping into the cylinder on turbulent head engines. | 21th Feb 1929 | Box 66a \ 2 scan0095 | |
| Wallace-Barnes valve springs, their performance on Phantom models, and proposed design changes. | 13th May 1929 | Box 66a \ 2 scan0096 | |
| Valve gear noise issues, detailing the evolution of valve springs for the Phantom model. | 13th May 1929 | Box 66a \ 2 scan0097 | |
| Engine valve clearances, tappet roller alignment, and the complexities of valve spring performance analysis. | 25th May 1929 | Box 66a \ 2 scan0098 | |
| Typed memo about a vibration complaint in a car's valve gear, which the Nice depot could not resolve. | 25th May 1929 | Box 66a \ 2 scan0099 | |
| Valve spring issue on Phantom cars, a customer complaint, and the proposed solution of fitting heavier springs. | 1st Jun 1929 | Box 66a \ 2 scan0100 | |
| Follow-up memo regarding an unresolved issue with chassis 53-WR. | 21th Jun 1929 | Box 66a \ 2 scan0101 | |
| Response to the Paris Depot concerning valve gear vibration and noise on chassis 53-WR, suggesting causes and remedies. | 1st Jun 1929 | Box 66a \ 2 scan0102 | |
| The investigation of an engine clatter on chassis 53-WR, traced to slackness in two connecting rods. | 28th Jun 1929 | Box 66a \ 2 scan0103 | |
| Secret memorandum detailing potential engine and chassis improvements and design considerations. | 10th Mar 1924 | Box 66a \ 2 scan0104 | |
| Improvements for the silencer, clutch, and brake operation, with an appeal to finalise the program. | 1st May 1924 | Box 66a \ 2 scan0105 | |
| Secret memorandum on design changes for induction and exhaust pipes, switching to bolted joints and simplifying the heat jacket. | 1st May 1924 | Box 66a \ 2 scan0106 | |
| Secret memorandum on an experimental engine with opposed sparking plugs and a new induction pipe design. | 30th May 1924 | Box 66a \ 2 scan0107 | |
| Cracked 'V' series induction pipe bends and the proposed modifications. | 15th Apr 1925 | Box 66a \ 2 scan0108 | |
| Drawing illustrating a cracked induction bend from car 98NK. | 15th Apr 1925 | Box 66a \ 2 scan0109 | |
| Authorisation sheet for a modification to the brake pedal gear on the 'India' plus F.W.B. model. | 21th May 1925 | Box 66a \ 2 scan0110 | |
| Comparison of induction pipe depressions for E.A.C. and 40/50 HP engines at various speeds. | 1st May 1925 | Box 66a \ 2 scan0111 | |
| Comparing the performance of a standard induction system with an experimental aluminium pipe and water-heated hot spot. | 1st Sep 1925 | Box 66a \ 2 scan0112 | |
| Insufficient heating on the Phantom induction pipe and proposed solutions. | 12th Oct 1925 | Box 66a \ 2 scan0113 | |
| With diagrams illustrating four different induction pipe and carburettor systems for testing on an EAC engine. | 1st Nov 1925 | Box 66a \ 2 scan0114 | |
| Methods and experiments for heating the throttles on the Phantom model. | 19th Feb 1926 | Box 66a \ 2 scan0115 | |
| Engine cooling strategies using steam and the practicality of exhaust-heated throttles. | 23th Feb 1926 | Box 66a \ 2 scan0116 | |
| Further chassis testing of a Phantom cylinder head with opposed sparking plugs to investigate detonation and popping in the silencer. | 23th Feb 1926 | Box 66a \ 2 scan0117 | |
| Tests on Phantom induction pipes to overcome fuel separation issues in the system. | 24th Feb 1926 | Box 66a \ 2 scan0118 | |
| Use of aluminium versus fibre washers on an induction pipe. | 10th Mar 1926 | Box 66a \ 2 scan0119 | |
| Drawings and modifications for the Phantom Aluminium Head. | 10th Mar 1926 | Box 66a \ 2 scan0120 | |
| Design simplifications for the induction pipe bolting on a Phantom Aluminium Head. | 10th Mar 1926 | Box 66a \ 2 scan0121 | |
| Strengthening modifications to the New Phantom induction pipe and Autovac union fitting. | 22th Mar 1926 | Box 66a \ 2 scan0122 | |
| Development and potential benefits of a lighter aluminium engine with increased horsepower for the Phantom model. | 11th Apr 1926 | Box 66a \ 2 scan0123 | |
| The aluminium induction system and carburetter for the 40/50 HP Chassis C.2. Series. | 6th Jul 1926 | Box 66a \ 2 scan0124 | |
| Standardisation of an Aluminium Induction and Bend in place of Cast Iron to reduce weight. | 6th Jul 1926 | Box 66a \ 2 scan0125 | |
| Distribution tests for the Phantom engine, comparing different manifold and carburetter configurations. | 1st Aug 1926 | Box 66a \ 2 scan0126 | |
| Comparison of fuel distribution and performance using different manifold and carburettor configurations. | 1st Aug 1926 | Box 66a \ 2 scan0127 | |
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