| Description | Date | Identifier | |
| Continued report on vehicle mileage, petrol consumption, and a piston knock issue. | 4th Mar 1920 | Box 77 \ 3 scan0131 | |
| Extract listing components and modifications for a trials car for the American company. | 4th Mar 1920 | Box 77 \ 3 scan0132 | |
| Cover memo attaching a telegram regarding piston rattles in Car CJ6 during 10,000 miles trials. | 5th Mar 1920 | Box 77 \ 3 scan0133 | |
| Telegram reporting serious continuous piston rattles in chassis X.3443-2EX. | 5th Mar 1920 | Box 77 \ 3 scan0134 | |
| Piston rattles on the 2.EX Car caused by carbon binding. | 6th Mar 1920 | Box 77 \ 3 scan0135 | |
| Proposed part upgrades and adjustments for the 2.EX 10,000-mile test car. | 8th Mar 1920 | Box 77 \ 3 scan0136 | |
| Fixing piston rattles on car 2.EX, including a telegram to be sent to the mechanic. | 1st Mar 1920 | Box 77 \ 3 scan0137 | |
| Field report letter detailing issues with pistons, a shock absorber, and ignition on chassis 2EX. | 12th Mar 1920 | Box 77 \ 3 scan0138 | |
| Car's performance, detailing mileage, fuel consumption, a faulty shock absorber, and positive feedback on the engine. | 15th Mar 1920 | Box 77 \ 3 scan0139 | |
| Wire request to Maddocks regarding piston clearance on chassis 2.EX. | 15th Mar 1920 | Box 77 \ 3 scan0140 | |
| Cause and potential cures for piston rattles. | 16th Mar 1920 | Box 77 \ 3 scan0141 | |
| Confirmation of a telegram from Royce regarding engine rattles, with a suggested fix for the pistons. | 16th Mar 1920 | Box 77 \ 3 scan0142 | |
| Piston rattles on a 2.EX Car and a potential manufacturing error. | 17th Mar 1920 | Box 77 \ 3 scan0143 | |
| Letter from T.H. Maddocks detailing vehicle faults including a broken shock absorber and pitted ignition points on chassis 2EX. | 17th Mar 1920 | Box 77 \ 3 scan0144 | |
| Piston modifications, suggesting a return to a pre-war practice without waiting for a full 10,000-mile test. | 18th Mar 1920 | Box 77 \ 3 scan0145 | |
| Confirmation of a telegram regarding engine piston modifications to prevent rattles due to carbon deposits. | 16th Mar 1920 | Box 77 \ 3 scan0146 | |
| Problem of piston rattles in certain cars and seeking a resolution. | 18th Mar 1920 | Box 77 \ 3 scan0147 | |
| Telegram to Maddocks in Nice regarding an experimental car and pistons clearance. | 18th Mar 1920 | Box 77 \ 3 scan0148 | |
| Telegram from Hives to Maddocks in France, inquiring about solutions for piston binding and what oil was used. | 19th Mar 1920 | Box 77 \ 3 scan0149 | |
| Summarizing a conference on the causes and observations of piston rattles in engines. | 22th Mar 1920 | Box 77 \ 3 scan0150 | |
| Piston rattles, clearances, different piston types, and the effects of lubricating oils. | 22th Mar 1920 | Box 77 \ 3 scan0151 | |
| Piston rattle issues, recommending against immediate modification and suggesting further investigation. | 22th Mar 1920 | Box 77 \ 3 scan0152 | |
| Page discussing production modifications, including increased piston clearance as recommended by Mr. Royce. | 22th Mar 1920 | Box 77 \ 3 scan0153 | |
| The standardization and supply of split aluminium pistons for the American Company's trials car. | 25th Mar 1920 | Box 77 \ 3 scan0154 | |
| Cause of an 'elusive knock' being a gudgeon pin knock and potential experimental solutions. | 27th Mar 1920 | Box 77 \ 3 scan0155 | |
| The design and ring configuration for aluminium pistons in car engines. | 29th Mar 1920 | Box 77 \ 3 scan0156 | |
| Arrangement of split aluminium pistons for the American trials car, 22-LW. | 29th Mar 1920 | Box 77 \ 3 scan0157 | |
| Fitting of new split aluminium pistons for an American trials car, designated 22-LW. | 30th Mar 1920 | Box 77 \ 3 scan0158 | |
| The standardisation sheet for a modified aluminum split piston. | 9th Apr 1920 | Box 77 \ 3 scan0159 | |
| Test report and approval sheet for a modified type of aluminium split piston. | 20th Jan 1920 | Box 77 \ 3 scan0160 | |
| Modified type of aluminium split piston. | 19th Jan 1920 | Box 77 \ 3 scan0161 | |
| Approving a modification for piston rattles on the 10,000 Miles Trials Car. | 16th Mar 1920 | Box 77 \ 3 scan0162 | |
| Copy of a telegram from Mr. Royce regarding a solution for piston tightness due to carbon deposit. | 15th Mar 1920 | Box 77 \ 3 scan0163 | |
| Standardization of a new eccentric walled piston following a successful 10,000-mile test run. | 29th Mar 1920 | Box 77 \ 3 scan0164 | |
| Performance report on modified aluminium split pistons after extensive mileage tests. | 8th Apr 1920 | Box 77 \ 3 scan0165 | |
| Testing and standardisation of modified aluminium split pistons. | 8th Apr 1920 | Box 77 \ 3 scan0166 | |
| From CJ to Hs agreeing to a previous memo about modified aluminium split pistons. | 9th Apr 1920 | Box 77 \ 3 scan0167 | |
| The 2.EX Chassis 10,000-mile test, concerning a battery issue and a list of parts proposed for standardisation. | 9th Apr 1920 | Box 77 \ 3 scan0168 | |
| Continued report on piston design, discussing clearances, engine stiffness, and gas leakage issues. | 12th Apr 1920 | Box 77 \ 3 scan0169 | |
| Piston design, gas leakage, and the effectiveness of different types of piston rings and materials. | 2nd Apr 1920 | Box 77 \ 3 scan0170 | |
| Comparison of horsepower (HP) taken on an engine with cast iron vs. aluminium pistons, and a second test with varying numbers of piston rings. | 12th Apr 1920 | Box 77 \ 3 scan0171 | |
| Investigation into the causes and occurrences of piston rattles. | 13th Apr 1920 | Box 77 \ 3 scan0172 | |
| Continued document discussing the issuance of a Standardisation Sheet and a report from Mr. Hives on a production modification. | 13th Apr 1920 | Box 77 \ 3 scan0173 | |
| Extract detailing a list of parts and modifications for a car destined for West Wittering. | 19th Apr 1920 | Box 77 \ 3 scan0174 | |
| From JS to HS regarding papers about fitting two extra rings to pistons, sent to Mr. Johnson. | 21th Apr 1920 | Box 77 \ 3 scan0175 | |
| Standardisation of chassis parts by fitting two extra rings to the pistons to prevent carbon deposit. | 14th Apr 1920 | Box 77 \ 3 scan0176 | |
| Copy of a telegram from Mr. Royce regarding a solution for piston tightness due to carbon deposit. | 15th Mar 1920 | Box 77 \ 3 scan0177 | |
| The investigation of piston rattles, detailing various test cases and outcomes. | 13th Feb 1920 | Box 77 \ 3 scan0178 | |
| Recommendations for fitting extra piston rings to prevent piston rattles and improve gas tightness. | 9th Feb 1920 | Box 77 \ 3 scan0179 | |
| Piston rattles due to carbon accumulation, comparing cast iron and aluminium pistons, and suggesting design changes. | 20th Apr 1920 | Box 77 \ 3 scan0180 | |
| Engine faults and recommending the standardisation of pistons with extra rings to resolve them. | 20th Apr 1920 | Box 77 \ 3 scan0181 | |
| Report page detailing engine issues with the ignition system, piston leakage, and carburation. | 6th Aug 1919 | Box 77 \ 3 scan0182 | |
| Standardisation sheet for a new type of piston. | 24th Apr 1920 | Box 77 \ 3 scan0183 | |
| Confirming the standardisation of modified aluminium split pistons after successful testing. | 27th Apr 1920 | Box 77 \ 3 scan0184 | |
| Approving preparations for the introduction of modified aluminium split pistons, pending a continuous engine test. | 19th Apr 1920 | Box 77 \ 3 scan0185 | |
| From R. to C.J. regarding a proposed modification to make aluminium split pistons thicker. | 14th Apr 1920 | Box 77 \ 3 scan0186 | |
| Delay of the 6.EX replacement car and a list of new parts being fitted. | 28th May 1920 | Box 77 \ 3 scan0187 | |
| List of experimental parts being prepared for fitting to car 6.EX. | 28th Jun 1920 | Box 77 \ 3 scan0188 | |
| Observations and improvements on various components of chassis 6.EX. | 17th Jul 1920 | Box 77 \ 3 scan0189 | |
| Modifications made to experimental car 1.EX and proposing its transport to West Wittering. | 1st Aug 1920 | Box 77 \ 3 scan0190 | |
| Unfavorable comparison of post-war car horsepower and acceleration with pre-war models. | 10th Sep 1920 | Box 77 \ 3 scan0191 | |
| Report comparing high and low compression engines, detailing issues with over-oiling, piston gas-tightness, and proposing modifications. | 10th Sep 1920 | Box 77 \ 3 scan0192 | |
| Impact of gear ratios and tyre sizes on car performance. | 10th Sep 1920 | Box 77 \ 3 scan0193 | |
| Performance issues and potential design improvements for split type pistons. | 12th Dec 1919 | Box 77 \ 3 scan0194 | |
| Overcoming piston knocks, the impact of a moulders' strike on production, and recommending the consideration of cast iron pistons. | 12th Dec 1919 | Box 77 \ 3 scan0195 | |
| Advantages and disadvantages of using cast iron pistons over aluminium pistons. | 12th Dec 1919 | Box 77 \ 3 scan0196 | |
| The reliability of aluminium pistons compared to cast iron, noting disintegration troubles faced by other manufacturers. | 12th Dec 1919 | Box 77 \ 3 scan0197 | |
| Copy of a telegram from Mr. Royce regarding piston design and production. | 19th Dec 1919 | Box 77 \ 3 scan0198 | |
| Development and testing of cast iron pistons as an alternative to aluminium pistons. | 19th Dec 1919 | Box 77 \ 3 scan0199 | |
| Testing strategy for various piston materials and designs, including aluminium, cast iron, and Zephyr split pistons. | 22th Dec 1919 | Box 77 \ 3 scan0200 | |
| Development and testing of various piston designs, including issues with flexibility, seizure, and over-oiling. | 29th Dec 1919 | Box 77 \ 3 scan0201 | |
| Successful cast iron pistons and sending a sample to West Wittering. | 31th Dec 1919 | Box 77 \ 3 scan0202 | |
| Clarifying the success of E.4237 cast iron pistons is due to the omission of the E.3028 stiffening plate. | 2nd Jan 1920 | Box 77 \ 3 scan0203 | |
| Critique of a submitted cast iron piston design and a proposal for a new trunk-type piston for testing. | 6th Jan 1920 | Box 77 \ 3 scan0204 | |
| Testing of Ricardo and Zephyr type pistons in different materials. | 1st Jan 1920 | Box 77 \ 3 scan0205 | |
| The modification of a cast iron piston for testing purposes. | 7th Jan 1920 | Box 77 \ 3 scan0206 | |
| Recommendation to adopt a new design of split aluminium piston. | 17th Jan 1920 | Box 77 \ 3 scan0207 | |
| Plan to fit cast iron pistons to trial cars for comparison with existing aluminium pistons. | 17th Jan 1920 | Box 77 \ 3 scan0208 | |
| Bulk production and redesign of pistons, including split pistons and cast iron alternatives. | 21th Jan 1920 | Box 77 \ 3 scan0209 | |
| Testing and performance of split cast iron pistons. | 24th Jan 1920 | Box 77 \ 3 scan0210 | |
| Risk of seizure in standard cast iron pistons after repair. | 24th Jan 1920 | Box 77 \ 3 scan0211 | |
| Proposal of a new solid type piston design (drawing N.3509) for repair cars. | 18th Feb 1920 | Box 77 \ 3 scan0212 | |
| Confirming Mr. Royce's approval of a cast iron split piston design with a requested alteration to the saw-cut. | 23th Feb 1920 | Box 77 \ 3 scan0213 | |
| Blueprints for an urgent experimental set of Cast Iron Split Pistons for Pre-War Engines. | 26th Feb 1920 | Box 77 \ 3 scan0214 | |
| Adoption of split aluminium pistons for repair work and investigating a related engine knock. | 26th Feb 1920 | Box 77 \ 3 scan0215 | |
| Proposal to bring the 4.EX experimental chassis for testing, detailing its new features. | 27th Feb 1920 | Box 77 \ 3 scan0216 | |
| New split-type cast iron repair pistons requiring testing and sanction before standard use. | 1st Mar 1920 | Box 77 \ 3 scan0217 | |
| Questioning whether new cast-iron pistons for repair work will be thoroughly tested. | 1st Mar 1920 | Box 77 \ 3 scan0218 | |
| Road testing requirements for cast iron repair pistons. | 1st Mar 1920 | Box 77 \ 3 scan0219 | |
| Engine over-oiling complaints from the U.S.A., related to piston ring design. | 8th Jun 1921 | Box 77 \ 3 scan0220 | |
| Recommendation to fit aluminium pistons instead of cast iron to prevent detonations and seizing. | 8th Jun 1921 | Box 77 \ 3 scan0221 | |
| Cast Iron split piston for short connecting rods. | 1st Jan 1920 | Box 77 \ 3 scan0222 | |
| New cast iron piston design (N.3080) and a modified version (N.2965) for short connecting rods. | 1st Jan 1920 | Box 77 \ 3 scan0223 | |
| Explaining why piston rings on Cast Iron Pistons are not carried as far down as on aluminium pistons. | 9th Jan 1920 | Box 77 \ 3 scan0224 | |
| Cancelling further work on the Cast Iron Piston N.3080. | 21th Jan 1920 | Box 77 \ 3 scan0225 | |
| Diagonal web scraper piston in cast iron with a spring skirt. | 13th Jan 1920 | Box 77 \ 3 scan0226 | |
| Comparative wear on cylinder bores caused by aluminium versus cast iron pistons. | 12th Apr 1920 | Box 77 \ 3 scan0227 | |
| Persevering with aluminium pistons versus returning to cast iron pistons, citing issues from 1914. | 12th Apr 1920 | Box 77 \ 3 scan0228 | |
| Piston troubles, comparing aluminium and split cast iron pistons, and a recommended repair procedure. | 12th Apr 1920 | Box 77 \ 3 scan0229 | |
| Piston clearances, piston knock, engine stiffness, and gas leakage issues. | 12th Apr 1920 | Box 77 \ 3 scan0230 | |
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