| Description | Date | Identifier | |
| Tests verifying the results of different front engine mounting configurations. | 15th Oct 1934 | Box 14 \ 5 Scan307 | |
| Tests on torque reaction dampers, engine feet, and rubbers to improve engine smoothness and stability. | 15th Oct 1934 | Box 14 \ 5 Scan308 | |
| Specifications for high-rating springs to be used in an experiment to turn the engine into a harmonic damper. | 26th Oct 1934 | Box 14 \ 5 Scan309 | |
| Specification for the compression of Phantom II front engine rubbers. | 28th Dec 1934 | Box 14 \ 5 Scan310 | |
| Standardisation of parts for the flexible mounting of the engine at the rear. | 12th Jan 1935 | Box 14 \ 5 Scan311 | |
| Cost estimate for extra tooling and production details for the T.2 series chassis. | 10th Jan 1935 | Box 14 \ 5 Scan312 | |
| Investigation into a complaint about torque reaction bolts coming adrift on Chassis No.103-TA, causing water loss. | 25th Jun 1935 | Box 14 \ 5 Scan313 | |
| Water leak from the radiator drain tap on chassis 103-TA, caused by a loose engine support damper bolt. | 18th Jun 1935 | Box 14 \ 5 Scan314 | |
| Standardisation of the front silencer. | 24th Sep 1926 | Box 14 \ 6 Scan001 | |
| The standardisation of chassis parts. | 1st Nov 1926 | Box 14 \ 6 Scan002 | |
| The distortion and damage to the exhaust pipes on a 12-EX car. | 1st Nov 1926 | Box 14 \ 6 Scan003 | |
| Modifications to the exhaust system and its position relative to the frame. | 18th Nov 1926 | Box 14 \ 6 Scan004 | |
| Modifications for fitting a shock damper front axle control to an EAC.7 chassis. | 6th Jan 1927 | Box 14 \ 6 Scan005 | |
| Modifications to the brackets for a silencer's heat shield to allow for expansion. | 5th May 1927 | Box 14 \ 6 Scan006 | |
| On the non-essentiality of the exhaust heat shield for open touring cars and the ongoing testing of a baffle. | 15th Jul 1927 | Box 14 \ 6 Scan007 | |
| Proceeding with Scheme 963 for the crankchamber of a Phantom sequence starter. | 22th Sep 1927 | Box 14 \ 6 Scan008 | |
| Design of exhaust manifolds and pipes for the Super Sports 20 HP model. | 21th Jan 1928 | Box 14 \ 6 Scan009 | |
| Next 10,000 miles test for the Standard Phantom and design considerations for the sports carburettor. | 6th Feb 1926 | Box 14 \ 6 Scan010 | |
| Design and potential issues of proposed exhaust pipes for the EAC.10 model. | 25th Feb 1928 | Box 14 \ 6 Scan011 | |
| Drawing Lec.2518 for an exhaust manifold, advising to await feedback before proceeding. | 27th Feb 1928 | Box 14 \ 6 Scan012 | |
| Design of an 'SS' exhaust pipe, suggesting a more practical and less costly 4-bolt flange. | 28th Feb 1928 | Box 14 \ 6 Scan013 | |
| Drawing for an alternative exhaust pipe joint. | 8th Mar 1928 | Box 14 \ 6 Scan014 | |
| Modification of an 'SS' exhaust pipe main connection to a 4-bolt flange. | 8th Mar 1928 | Box 14 \ 6 Scan015 | |
| Outlining two modification schemes for an exhaust pipe flange to improve alignment tolerance. | 20th Mar 1928 | Box 14 \ 6 Scan016 | |
| Drawing for an EAC.10 Exhaust Pipe Flange. | 22th Mar 1928 | Box 14 \ 6 Scan017 | |
| Technical note discussing the design of a bolted exhaust pipe joint with spherical seats. | 25th Mar 1928 | Box 14 \ 6 Scan018 | |
| Hand-drawn sketch of a front exhaust downtake pipe showing a failed joint and a proposed modification. | 1st Jul 1932 | Box 14 \ 6 Scan019 | |
| Design sketch featuring a radiator grille and a crankshaft, accompanied by dimensions and handwritten notations. | 1st Jul 1932 | Box 14 \ 6 Scan020 | |
| Modifications to a blueprint for an exhaust pipe flange. | 5th Apr 1928 | Box 14 \ 6 Scan021 | |
| Investigation into the stretching and collapsing of exhaust valves on the Phantom model. | 10th May 1928 | Box 14 \ 6 Scan022 | |
| The difficulty of accessing a bolt on the F.2.B. engine exhaust system, requiring a special tool. | 20th Jun 1928 | Box 14 \ 6 Scan023 | |
| Alteration to the F-2-B series chassis, inverting the bolts on the exhaust manifold. | 22th Jun 1928 | Box 14 \ 6 Scan024 | |
| Modifications to the 'SS' exhaust cutout and its operating gear. | 12th Sep 1928 | Box 14 \ 6 Scan025 | |
| Alterations to the cylinder head for exhaust heated versus water heated induction pipes. | 12th Sep 1928 | Box 14 \ 6 Scan026 | |
| Drawings and design changes for the 'SS' exhaust system. | 14th Sep 1928 | Box 14 \ 6 Scan027 | |
| Sending a drawing for a heat shield over the silencer for an 'SS' exhaust system. | 20th Sep 1928 | Box 14 \ 6 Scan028 | |
| Modifications to the 'SS' Gearbox Undershield and associated components. | 1st Oct 1928 | Box 14 \ 6 Scan029 | |
| Power loss and noise issues with the Super Sports exhaust system. | 27th Oct 1928 | Box 14 \ 6 Scan030 | |
| Graph plotting Brake Horse Power and Percentage Power Loss against RPM for a Super Sports Engine, comparing open exhaust ports with an exhaust manifold. | 26th Oct 1928 | Box 14 \ 6 Scan031 | |
| Largely blank page with a purple ink reception stamp in the bottom right corner. | 27th Oct 1928 | Box 14 \ 6 Scan032 | |
| Inquiry regarding the progress of tests for a rustless exhaust snout. | 29th Oct 1928 | Box 14 \ 6 Scan033 | |
| Production of a new exhaust cam and its associated valve lift curve. | 1st Nov 1928 | Box 14 \ 6 Scan034 | |
| Investigation into exhaust valve stretching, concluding it is caused by insufficient tappet clearance. | 1st Nov 1928 | Box 14 \ 6 Scan035 | |
| Booming issue with the 'SS' exhaust silencer and a proposed experimental test. | 26th Nov 1928 | Box 14 \ 6 Scan036 | |
| The failure of an aluminium exhaust joint washer, recommending replacement with steel. | 1st Dec 1928 | Box 14 \ 6 Scan037 | |
| Instruction to change the material of the spherical washer for the exhaust pipe from aluminium to stainless steel. | 8th Dec 1928 | Box 14 \ 6 Scan038 | |
| Responding to reports on a 10,000 miles test, detailing issues with radiator leakage and a silencer. | 27th Dec 1928 | Box 14 \ 6 Scan039 | |
| Multiple issues with the 20 HP car and recommending more work before production. | 2nd Jan 1929 | Box 14 \ 6 Scan040 | |
| Recommendation to continue production of the 20 HP car with modifications while completing the SS model. | 1st Jan 1929 | Box 14 \ 6 Scan041 | |
| Test failures at Chateauroux, including gearbox anchorage, chassis instability, and a burnt-out exhaust manifold. | 1st Jan 1929 | Box 14 \ 6 Scan042 | |
| Performance issues with the 'SS' vacuum pump and recommending modifications. | 1st Jan 1929 | Box 14 \ 6 Scan043 | |
| Experiments and potential modifications to an 'SS' engine exhaust system. | 16th Jan 1929 | Box 14 \ 6 Scan044 | |
| Telegram message referring to document L E C 2591 concerning an exhaust-heated induction pipe. | 16th Jan 1925 | Box 14 \ 6 Scan045 | |
| New three-section exhaust design with an expansion chamber for 'SS' and 20 HP cars. | 17th Jan 1929 | Box 14 \ 6 Scan046 | |
| Proposed cast exhaust manifold design with modifications to clear sparking plugs. | 19th Jan 1929 | Box 14 \ 6 Scan047 | |
| Progress memo regarding the production of the 'SS' Car, detailing work on engine mounting and exhaust systems. | 21th Jan 1929 | Box 14 \ 6 Scan048 | |
| Further tests and modifications to the 'SS' car's engine and body mountings to reduce exhaust periods and front end dither. | 21th Jan 1929 | Box 14 \ 6 Scan049 | |
| Experiments to prevent body yawing by altering frame rigidity and front mounting. | 22th Jan 1929 | Box 14 \ 6 Scan050 | |
| Short memo confirming receipt of all necessary information for the 'SS' Exhaust System. | 22th Jan 1929 | Box 14 \ 6 Scan051 | |
| The performance of two exhaust snouts made from Staybrite steel after prolonged use. | 22th Jan 1929 | Box 14 \ 6 Scan052 | |
| Instructions regarding alternative schematics for the 'SS' exhaust system, specifically for the parallel sliding joint. | 25th Jan 1929 | Box 14 \ 6 Scan053 | |
| Design and material specifications for an 'SS' exhaust manifold. | 28th Jan 1929 | Box 14 \ 6 Scan054 | |
| Design specifications for a new 2.25 inch 'SS' exhaust manifold, including material suggestions and production considerations. | 29th Jan 1929 | Box 14 \ 6 Scan055 | |
| Design and simplification of exhaust pipes, including a copy of a telegram. | 30th Jan 1929 | Box 14 \ 6 Scan056 | |
| Technical memorandum discussing the design of an automotive exhaust system. | 30th Jan 1929 | Box 14 \ 6 Scan057 | |
| Design of an exhaust system, including materials and construction methods, accompanied by sketches. | 30th Jan 1929 | Box 14 \ 6 Scan058 | |
| Improved design scheme and giving the recipient autonomy over the final decision. | 1st Feb 1929 | Box 14 \ 6 Scan059 | |
| Abandoning exhaust heating in favour of water heating for the S.S. and G.4. induction system. | 1st Feb 1929 | Box 14 \ 6 Scan060 | |
| Agreeing to the standardisation of Staybrite steel for exhaust systems on the S.S. Chassis. | 8th Feb 1929 | Box 14 \ 6 Scan061 | |
| Various designs and experiments for an SS exhaust system. | 9th Feb 1929 | Box 14 \ 6 Scan062 | |
| Specifications for a Staybrite steel fishtail exhaust outlet for SS and 20 HP chassis. | 12th Feb 1929 | Box 14 \ 6 Scan063 | |
| Mr. Elliott's visit to Le Canadel, a 10,000-mile car test, and finalising engine and exhaust work. | 15th Feb 1929 | Box 14 \ 6 Scan064 | |
| Design and construction of experimental exhaust pipes and silencers. | 19th Feb 1929 | Box 14 \ 6 Scan065 | |
| Carburation, water circulation, and potential engine design improvements. | 2nd Feb 1929 | Box 14 \ 6 Scan066 | |
| The 'SS' Exhaust System, sending a sketch showing a stop for a sliding joint. | 26th Feb 1929 | Box 14 \ 6 Scan067 | |
| Proposed sling for the SS. Exhaust System's horizontal pipe. | 26th Feb 1929 | Box 14 \ 6 Scan068 | |
| Proposal to change the material of the exhaust snout to Staybright steel to overcome rusting. | 12th Feb 1929 | Box 14 \ 6 Scan069 | |
| The fitting of a new part to the 40/50 HP and 20 HP chassis models. | 14th Apr 1929 | Box 14 \ 6 Scan070 | |
| Experiments and recommendations to increase the efficiency of the 'SS' vacuum pump by enlarging pipe diameters. | 20th Mar 1929 | Box 14 \ 6 Scan071 | |
| Proposal and modification for an SS exhaust cutout control. | 22th Mar 1929 | Box 14 \ 6 Scan072 | |
| Experimental fitting of a Phantom rear silencer to an SS car's exhaust system. | 1st Mar 1929 | Box 14 \ 6 Scan073 | |
| Completion and return of documents for the 'SS' Exhaust System. | 27th Mar 1929 | Box 14 \ 6 Scan074 | |
| Modifications to the 'SS' exhaust system, including the cutout, silencer suspension, and tubular members. | 28th Mar 1929 | Box 14 \ 6 Scan075 | |
| Design change for the 'SS' exhaust system gusset plate and L.H. controls. | 13th Apr 1929 | Box 14 \ 6 Scan076 | |
| Confirming modifications to the 'SS' cutout control, including the silencer position, intermediate lever, and heat shield. | 17th Apr 1929 | Box 14 \ 6 Scan077 | |
| Instructions from Mr. Royce on an experiment for the 'SS' exhaust silencer, detailing the arrangement of baffles and holes. | 1st May 1929 | Box 14 \ 6 Scan078 | |
| Reverting to a fabric coupling and the exhaust system for 'SS' cars due to faults. | 6th May 1929 | Box 14 \ 6 Scan079 | |
| Notice confirming the exhaust system for the J.2 series is satisfactory and will not be changed back to the Phantom system. | 27th May 1929 | Box 14 \ 6 Scan080 | |
| Implementation of thermostatically controlled radiator shutters as an alternative to hand control. | 27th May 1929 | Box 14 \ 6 Scan081 | |
| Brinell hardness of aluminium bronze bars intended for S.S. exhaust valve seatings. | 18th Jun 1929 | Box 14 \ 6 Scan082 | |
| Configuration of two S.S. chassis for testing engine noise and roughness. | 20th Jun 1929 | Box 14 \ 6 Scan083 | |
| Car's exhaust, steering, and a recommendation to keep car 21-EX as a reference standard. | 21th Jun 1929 | Box 14 \ 6 Scan084 | |
| Issues with a red water boiling indicator lamp and silencer popping on the 21-EX car. | 21th Jun 1929 | Box 14 \ 6 Scan085 | |
| Solutions for S.S. Exhaust noise and cracking issues, suggesting design modifications. | 1st Jul 1929 | Box 14 \ 6 Scan086 | |
| Recommendation to try water cooling a section of pipe to reduce heat, noise, expansion, and oxidation. | 2nd Jul 1929 | Box 14 \ 6 Scan087 | |
| The cause of exhaust cracking noise and proposed solutions involving studs, nuts, and the downtake pipe. | 2nd Jul 1929 | Box 14 \ 6 Scan088 | |
| Issues with the S.S. Exhaust System's Cut Out Valve and a proposed strengthened design. | 6th Jul 1929 | Box 14 \ 6 Scan089 | |
| Blueprint diagram for a modified exhaust cut-out, designated S.S. | 11th Jul 1929 | Box 14 \ 6 Scan090 | |
| Telegram proposing modifications to an exhaust system and silencer. | 11th Jul 1929 | Box 14 \ 6 Scan091 | |
| Request for a complete analysis of a badly pitted S.S. engine exhaust valve to determine its material and the cause of the pitting. | 11th Jul 1929 | Box 14 \ 6 Scan092 | |
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