| Description | Date | Identifier | |
| Comparing the performance of different vehicle silencers in terms of noise and power. | 27th Nov 1925 | Box 66 \ 2 scan0124 | |
| Modification to a silencer assembly due to expansion issues found during testing. | 27th Nov 1925 | Box 66 \ 2 scan0125 | |
| Graph showing power curves from comparative silencer tests. | 2nd Dec 1925 | Box 66 \ 2 scan0126 | |
| New silencer for the New Phantom model. | 2nd Dec 1925 | Box 66 \ 2 scan0127 | |
| Test report comparing a proposed new silencer against the standard one for the New Phantom chassis. | 30th Nov 1925 | Box 66 \ 2 scan0128 | |
| Requesting details about a modified exhaust silencer for cost estimation purposes. | 3rd Dec 1925 | Box 66 \ 2 scan0129 | |
| Persistent and annoying squeak from the butterfly exhaust valve on the New Phantom model. | 4th Dec 1925 | Box 66 \ 2 scan0130 | |
| The difficulties with the butterfly exhaust valve on the New Phantom and Silver Ghost models. | 4th Dec 1925 | Box 66 \ 2 scan0131 | |
| Inquiring about the test results for the New Phantom silencer and its subsequent fitting to demonstration cars. | 7th Dec 1925 | Box 66 \ 2 scan0132 | |
| The New Phantom Silencer, confirming test completion and recommending production. | 9th Dec 1925 | Box 66 \ 2 scan0133 | |
| Standardisation of chassis parts for a modified exhaust silencer to reduce noise. | 2nd Dec 1925 | Box 66 \ 2 scan0134 | |
| Works order for the supply of a new type silencer for chassis 66-MC, despatched to Cricklewood. | 17th Dec 1925 | Box 66 \ 2 scan0135 | |
| Schemes for improving carburation by increasing the temperature of water to the throttle valve and carburetter. | 17th Dec 1925 | Box 66 \ 2 scan0136 | |
| The cost increase for a modified exhaust silencer, to be attached to Standardisation Sheet X. 8230. | 22th Dec 1925 | Box 66 \ 2 scan0137 | |
| Standardisation of a bracket for the rear silencer to reduce weight and cost. | 4th Jan 1926 | Box 66 \ 2 scan0138 | |
| Exhaust pipe failures and distortions on a Phantom model during testing. | 27th Jan 1926 | Box 66 \ 2 scan0139 | |
| Stress-related failures in exhaust pipes and the unreliability of sliding joints. | 27th Jan 1926 | Box 66 \ 2 scan0140 | |
| Blueprint showing failures, cracks and breakages, on Phantom exhaust pipes. | 27th Jan 1926 | Box 66 \ 2 scan0141 | |
| Query about fitting asbestos and alum lagging sheets to the improved rear silencer on the 40/50HP chassis. | 4th Feb 1926 | Box 66 \ 2 scan0142 | |
| Recommendation to replace the thin sheet aluminium silencer lagging with a more durable rustless material. | 2nd Feb 1926 | Box 66 \ 2 scan0143 | |
| Arrangement and fitting of a superheat hot spot for car 44-PK. | 1st Feb 1926 | Box 66 \ 2 scan0144 | |
| Instruction to replace the aluminium silencer lagging with 'Staybrite' material on the New Phantom. | 10th Feb 1926 | Box 66 \ 2 scan0145 | |
| Superheated hot spot for the Phantom engine. | 2nd Feb 1926 | Box 66 \ 2 scan0146 | |
| Continued explanation of temperature differences in engine induction and exhaust systems. | 2nd Feb 1926 | Box 66 \ 2 scan0147 | |
| The performance of different heating mediums for a hot spot jacket, including test data on water flow. | 2nd Feb 1926 | Box 66 \ 2 scan0148 | |
| Report page detailing experiments on engine heating from cold and the effects of a superheated system on cylinder jacket water. | 2nd Feb 1926 | Box 66 \ 2 scan0149 | |
| Graph and analysis of hot spot temperature changes over time under light running conditions. | 2nd Feb 1926 | Box 66 \ 2 scan0150 | |
| Page analyzing the increase of induction pipe temperatures after starting from cold, comparing superheated, standard exhaust heated, and water-heated systems. | 2nd Feb 1926 | Box 66 \ 2 scan0151 | |
| Comparative analysis with a graph showing temperature increase over time for three different 'hot spot' systems. | 2nd Feb 1926 | Box 66 \ 2 scan0152 | |
| The working temperatures of standard exhaust and water heated systems at full throttle, including a performance graph. | 2nd Feb 1926 | Box 66 \ 2 scan0153 | |
| Report page detailing engine test results on induction pipe temperatures and the influence of hot spot temperature on power and efficiency. | 2nd Feb 1926 | Box 66 \ 2 scan0154 | |
| Technical analysis of engine performance tests comparing different hot spot systems and their effect on consumption and torque. | 2nd Feb 1926 | Box 66 \ 2 scan0155 | |
| Performance graph and analysis comparing fuel consumption against B.M.E.P. for different engine heating systems at 750 RPM. | 2nd Feb 1926 | Box 66 \ 2 scan0156 | |
| Graph and analysis comparing engine fuel consumption under different heating systems. | 2nd Feb 1926 | Box 66 \ 2 scan0157 | |
| Report page detailing tests on engine heating systems, focusing on heat transfer to jacket water and absorption by the charge. | 2nd Feb 1926 | Box 66 \ 2 scan0158 | |
| Technical report page with a graph and analysis of heat transfer in an engine cooling system and carburetter. | 2nd Feb 1926 | Box 66 \ 2 scan0159 | |
| Experiments investigating the influence of hot spot temperature on engine detonation, including a related graph. | 2nd Feb 1926 | Box 66 \ 2 scan0160 | |
| The influence of fuel volatility on the time taken for an engine to operate evenly from a cold start. | 2nd Feb 1926 | Box 66 \ 2 scan0161 | |
| Comparison of standard exhaust, superheated, and water-heated hot spot systems and their effects on engine performance. | 2nd Feb 1926 | Box 66 \ 2 scan0162 | |
| Analysis of the disadvantages of a standard system, focusing on issues with the exhaust throttle valve and potential overheating. | 12th Feb 1926 | Box 66 \ 2 scan0163 | |
| Schematic of apparatus for testing a superheated throttle and measuring water flow. | 12th Feb 1926 | Box 66 \ 2 scan0164 | |
| Experiments and suggestions for heating the throttle on the Phantom model. | 19th Feb 1926 | Box 66 \ 2 scan0165 | |
| Engine water jacket cooling, boiling water temperatures, and exhaust-heated throttles. | 2nd Feb 1926 | Box 66 \ 2 scan0166 | |
| Testing a Phantom cylinder head with opposed sparking plugs to investigate detonation and silencer popping. | 2nd Feb 1926 | Box 66 \ 2 scan0167 | |
| Irritating noise and driveability issues with the 'New Phantom' model. | 5th Mar 1926 | Box 66 \ 2 scan0168 | |
| Exhaust popping fault in a 40/50 HP demonstration car and seeking feedback on Phantoms. | 2nd Mar 1926 | Box 66 \ 2 scan0169 | |
| Technical report discussing the issue of exhaust popping on the 'New Phantom' model. | 4th Mar 1926 | Box 66 \ 2 scan0170 | |
| The issue of 'popping' in the exhaust on the New Phantom model. | 6th Mar 1926 | Box 66 \ 2 scan0171 | |
| And handwritten note concerning exhaust explosions in the New Phantom model. | 8th Mar 1926 | Box 66 \ 2 scan0172 | |
| Investigation into the problem of detonation in Phantom engines, identifying a lack of turbulence as the likely cause. | 11th Mar 1926 | Box 66 \ 2 scan0173 | |
| Analysis of Phantom engine performance, comparing it to the Silver Ghost, focusing on fuel consumption, self-ignition, and detonation issues. | 11th Mar 1926 | Box 66 \ 2 scan0174 | |
| Report page discussing engine detonation, the effects of ignition plugs, and the influence of engine speed and I.M.E.P. | 11th Mar 1926 | Box 66 \ 2 scan0175 | |
| Engine detonation tests and the introduction of a new cylinder head for the Phantom model. | 17th Mar 1926 | Box 66 \ 2 scan0176 | |
| Inquiring about the frequency of exhaust explosions in New Phantom cars. | 17th Mar 1926 | Box 66 \ 2 scan0177 | |
| Issue of exhaust explosions in the new Phantom car, comparing it to the Silver Ghost model. | 17th Mar 1926 | Box 66 \ 2 scan0178 | |
| Issue of popping in the exhaust on the New Phantom model. | 6th Mar 1926 | Box 66 \ 2 scan0179 | |
| Issue of popping and spitting in the exhaust of the New Phantom model, focusing on the governor control. | 1st Mar 1926 | Box 66 \ 2 scan0180 | |
| Alterations made to address exhaust popping in the New Phantom model. | 1st Mar 1926 | Box 66 \ 2 scan0181 | |
| Issue of exhaust popping in the New Phantom model when over-running. | 4th Mar 1926 | Box 66 \ 2 scan0182 | |
| Customer complaints about continuous and irritating popping in the exhaust of the New Phantom model. | 17th Mar 1926 | Box 66 \ 2 scan0183 | |
| Potential causes and solutions for firing in the exhaust of the Phantom model. | 30th Mar 1926 | Box 66 \ 2 scan0184 | |
| Proposal to experiment with a magnetic oxide coating as an anti-corrosion method for exhaust systems. | 16th Apr 1926 | Box 66 \ 2 scan0185 | |
| 900°C heat treatment process to prevent staining on steel and cast iron parts by creating a magnetic oxide layer. | 16th Apr 1926 | Box 66 \ 2 scan0186 | |
| Information regarding a potential cure for a squeaking exhaust butterfly valve on a 40/50 HP model. | 22th Apr 1926 | Box 66 \ 2 scan0187 | |
| Causes of explosions in a car's silencer, referencing the Phantom model. | 18th May 1926 | Box 66 \ 2 scan0188 | |
| The 7-EX engine's performance, specifically discussing firing in the exhaust, self-ignition, and carbon build-up after 8,600 miles. | 6th Apr 1926 | Box 66 \ 2 scan0189 | |
| Delays and design modifications for the Lightened Phantom Engine, specifically the induction and petrol drainage pipes. | 9th Jun 1926 | Box 66 \ 2 scan0190 | |
| Preference for a water-heated throttle over an exhaust pipe valve and suggesting further tests. | 11th Jun 1926 | Box 66 \ 2 scan0191 | |
| Mr. Royce's proposals for modifications to the water-heated throttle system. | 12th Jun 1926 | Box 66 \ 2 scan0192 | |
| Report listing four specific mechanical faults found in a car after a 260-mile test run. | 15th Jun 1926 | Box 66 \ 2 scan0193 | |
| Tests on the phenomenon of self-ignition in Phantom engines after switching off. | 18th Jun 1926 | Box 66 \ 2 scan0194 | |
| Engine self-ignition tests, focusing on the influence of exhaust valve temperature and engine speed. | 18th Jun 1926 | Box 66 \ 2 scan0195 | |
| Tests on the self-ignition temperatures of fuels such as petrol, benzol, and discoll. | 18th Jun 1926 | Box 66 \ 2 scan0196 | |
| Fuel ignition tests and the effects of water and air temperature on engine self-ignition. | 18th Jun 1926 | Box 66 \ 2 scan0197 | |
| General conclusions on engine self-ignition tests, comparing the Phantom and Silver Ghost models. | 18th Jun 1926 | Box 66 \ 2 scan0198 | |
| The cause of engines running backwards and the differences between the Phantom and Silver Ghost models. | 22th Jun 1926 | Box 66 \ 2 scan0199 | |
| Causes and potential solutions for self-ignition in the Phantom engine. | 22th Jun 1926 | Box 66 \ 2 scan0200 | |
| Mr. Royce's proposal to test a copper valve guide and umbrella valve to cure self-ignition on the Phantom. | 25th Jun 1926 | Box 66 \ 2 scan0201 | |
| The acquisition and analysis of 'Ochromite' Phantom exhaust valves for an experiment to prevent self-ignition. | 25th Jun 1926 | Box 66 \ 2 scan0202 | |
| Experiments comparing hot spot and pre-heated intake air systems on Phantom engines. | 26th Jun 1926 | Box 66 \ 2 scan0203 | |
| Report page detailing engine testing comparing a standard hot spot system with a preheated intake air system. | 26th Jun 1926 | Box 66 \ 2 scan0204 | |
| Analysis of engine torque variation and M.E.P. with changing intake air temperature, comparing a system with 'no heat to hot spot' to a standard system. | 26th Jun 1926 | Box 66 \ 2 scan0205 | |
| Report page analyzing the influence of mixture strength and air intake temperature on engine performance, with a corresponding graph. | 26th Jun 1926 | Box 66 \ 2 scan0206 | |
| Report analyzing the effect of high intake air temperature on engine power and fuel economy. | 26th Jun 1926 | Box 66 \ 2 scan0207 | |
| Graph showing the effect of preheating by different methods on a Standard Phantom engine with a 4.1 to 1 compression ratio. | 26th Jun 1926 | Box 66 \ 2 scan0208 | |
| Report page summarizing tests on engine air heating methods, detonation, and compression ratios. | 26th Jun 1926 | Box 66 \ 2 scan0209 | |
| The effects of hot air intake on engine performance, power, and tendency to detonate. | 29th Jun 1936 | Box 66 \ 2 scan0210 | |
| Instructions for the disposal and fitting of six sets of Phantom Staybrite exhaust pipes for testing and production analysis. | 29th Jun 1936 | Box 66 \ 2 scan0211 | |
| Two alternative systems for heating a carburettor throttle to avoid issues with the exhaust valve. | 5th Jul 1926 | Box 66 \ 2 scan0212 | |
| Carburetter throttle heating on Phantom engines and a proposal for car 7-EX. | 1st Jul 1926 | Box 66 \ 2 scan0213 | |
| Experiments comparing superheated throttle systems for carburetter heating on Phantom engines. | 1st Jul 1926 | Box 66 \ 2 scan0214 | |
| Analysis of an exhaust heated system's performance, with a graph comparing warm-up times for various configurations. | 1st Jul 1926 | Box 66 \ 2 scan0215 | |
| Performance comparison of a superheat system against a standard exhaust system, with a graph showing heating rates over time. | 1st Jul 1926 | Box 66 \ 2 scan0216 | |
| Engine warming-up tests and the heat added to the engine cooling system. | 5th Jul 1926 | Box 66 \ 2 scan0217 | |
| Summary of experiments on a boiler and throttle heating system, discussing performance and proposed improvements. | 5th Jul 1926 | Box 66 \ 2 scan0218 | |
| From E. to Hs. regarding the decision not to test an alternative jacket heating system for the carburetter throttle on Phantom engines. | 10th Jul 1926 | Box 66 \ 2 scan0219 | |
| Complaints, causes, and solutions for overheating in the interior of cars. | 14th Jul 1926 | Box 66 \ 2 scan0220 | |
| Suggestion to experimentally measure floor temperature in a closed car and identify the sources of heat. | 24th Jul 1926 | Box 66 \ 2 scan0221 | |
| Proposed alterations to the Phantom exhaust pipe and silencer to resolve expansion issues. | 24th Jul 1926 | Box 66 \ 2 scan0222 | |
| Experiments to determine the cause of explosions in a Phantom's silencer. | 1st Aug 1926 | Box 66 \ 2 scan0223 | |
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