| Description | Date | Identifier | |
| Carburettor noise, detailing modifications tested to reduce suction noise without power loss. | 1st Feb 1923 | Box 5 \ 4 04-page096 | |
| Baffle to achieve the same degree of silence as a long hot air pipe, with a standardisation sheet being circulated. | 9th Feb 1923 | Box 5 \ 4 04-page097 | |
| Issue of a whistling carburettor on an open demonstrating 20 HP car. | 9th Feb 1923 | Box 5 \ 4 04-page098 | |
| Noisy brake lever, a speedometer showing kilometres, and a whistling trouble. | 26th Feb 1923 | Box 5 \ 4 04-page099 | |
| Alterations for a noisy brake lever and a whistling throttle on chassis 46-G-1. | 28th Feb 1923 | Box 5 \ 4 04-page100 | |
| Urgent need to rectify rattling brake levers and whistling carburetters on 20 HP chassis. | 2nd Mar 1923 | Box 5 \ 4 04-page101 | |
| Issues with rattling brake levers and whistling carburettors on chassis 46-G-1. | 5th Mar 1923 | Box 5 \ 4 04-page102 | |
| The cause and modification of whistling carburetters and noisy brake levers on the 20 HP chassis. | 10th Jun 1923 | Box 5 \ 4 04-page103 | |
| Modifying carburetters and a proposed scheme for a floating stock of modified brake levers. | 9th Mar 1923 | Box 5 \ 4 04-page104 | |
| Actions to fix whistling carburetters and noisy brake levers on the 20 HP chassis. | 9th Mar 1923 | Box 5 \ 4 04-page105 | |
| Cover memo attaching a completed standardisation sheet for a low speed jet spindle and cone experiment. | 1st Mar 1923 | Box 5 \ 4 04-page106 | |
| Standardisation of the low speed jet spindle and cone to prevent whistling noise and to strengthen the part. | 8th Mar 1923 | Box 5 \ 4 04-page107 | |
| Standardisation and costs for the Low Speed Jet Spindle and Cone. | 15th Mar 1923 | Box 5 \ 4 04-page108 | |
| Modifications for rattling brake levers and whistling carburetters on the Goshawk chassis. | 10th Mar 1923 | Box 5 \ 4 04-page109 | |
| Delivery of 20 HP cars with whistling carburettors and rattling brake levers. | 12th Mar 1923 | Box 5 \ 4 04-page110 | |
| Carburettor adjustments for the Goshawk II engine, specifically regarding whistling and the use of varied thickness washers. | 27th Mar 1923 | Box 5 \ 4 04-page111 | |
| Failures, faulty use, and petrol leakage from the starter carburetter on 20-HP cars. | 13th Apr 1923 | Box 5 \ 4 04-page112 | |
| Letter about the seizure of carburetter throttles for the 20-HP model, discussing materials and poor assembly of control pins. | 18th Apr 1923 | Box 5 \ 4 04-page113 | |
| Road tests for 20 HP carburation modifications on a Goshawk engine. | 10th May 1923 | Box 5 \ 4 04-page114 | |
| Engine performance improvements, including consumption, torque, and acceleration, with details of ongoing vehicle testing. | 31th May 1925 | Box 5 \ 4 04-page115 | |
| Poor response and adjustment of the throttle lever on the 20 HP chassis. | 31th May 1925 | Box 5 \ 4 04-page116 | |
| Seizing of the Goshawk II carburetter's throttle valve spindle and potential solutions. | 6th Jun 1923 | Box 5 \ 4 04-page117 | |
| Tests to resolve throttle valve spindle seizure in the 20 HP chassis carburetter. | 12th Jun 1923 | Box 5 \ 4 04-page118 | |
| Adopting a plug type starting carburetter cock for the 20HP model. | 21th Jun 1923 | Box 5 \ 4 04-page119 | |
| Requesting a dimensional change to phosphor bronze bushes for a 20 HP chassis carburetter. | 6th Jul 1923 | Box 5 \ 4 04-page120 | |
| Carburettor restrictor issues in 20 HP demonstration cars following a visit. | 26th Jul 1923 | Box 5 \ 4 04-page121 | |
| Carburetter control, the unsatisfactory position with tapers, and plans for retrospective action. | 23th Jul 1923 | Box 5 \ 4 04-page122 | |
| Carburetter control modification standardisation sheet for the 4-Goshawk-II car. | 25th Jul 1923 | Box 5 \ 4 04-page123 | |
| Preferred carburetter settings and a warning against incorrect mixture configurations. | 1st Aug 1923 | Box 5 \ 4 04-page124 | |
| Complaint about the carburetter control cone taper on the 20-HP chassis and potential retrospective action. | 9th Sep 1923 | Box 5 \ 4 04-page125 | |
| Necessity and expense of correcting carburetter controls on 334 cars. | 9th Sep 1923 | Box 5 \ 4 04-page126 | |
| Inconsistent H.S. Air Valve action on the 20 HP Chassis carburetter, proposing a trial of experimental sets with a slack thread. | 3rd Oct 1923 | Box 5 \ 4 04-page127 | |
| Measuring frame deflection on a 20 HP frame with a static load. | 10th Oct 1923 | Box 5 \ 4 04-page128 | |
| Diagram and chart analyzing 20 HP frame deflections under a distributed load of 5200 lbs. | 4th Nov 1923 | Box 5 \ 4 04-page129 | |
| Querying the continued use of Monel metal for 20 HP chassis carburetter filters, when a change to brass was previously requested. | 11th Oct 1923 | Box 5 \ 4 04-page130 | |
| Faulty carburetter petrol filter on the 20-HP chassis, allowing fluff and foreign matter to enter the jets. | 12th Oct 1923 | Box 5 \ 4 04-page131 | |
| Suggestion to relocate the petrol supply cut-off tap on the 'Goshawk' model for easier access in an emergency. | 12th Nov 1923 | Box 5 \ 4 04-page132 | |
| Failure of the high speed jet control in a 20-HP carburettor. | 20th Dec 1923 | Box 5 \ 4 04-page133 | |
| Failure of a high-speed jet control on a Solex carburettor, with a proposed design improvement. | 27th Dec 1923 | Box 5 \ 4 04-page134 | |
| Customer complaints about a rattling petrol pipe on the 20-HP Chassis, requesting a redesign for better clearance or support. | 2nd Jan 1924 | Box 5 \ 4 04-page135 | |
| Failures of a carburetter high-speed jet sticking on a 20-HP chassis. | 19th Jan 1924 | Box 5 \ 4 04-page136 | |
| Production points for a modified air inlet on a 20 HP car. | 29th Apr 1924 | Box 5 \ 4 04-page137 | |
| Standardisation document for a carburetter air inlet, proposed to reduce engine noise. | 29th Apr 1924 | Box 5 \ 4 04-page138 | |
| Modified air inlet for a 20 HP car, detailing noise reduction and performance improvements. | 29th Apr 1934 | Box 5 \ 4 04-page139 | |
| Required modification to the Goshawk 11 carburetter controls. | 7th Jul 1924 | Box 5 \ 4 04-page140 | |
| Modifications to the Goshawk III carburetter and its filter design. | 7th Jul 1924 | Box 5 \ 4 04-page141 | |
| Goshawk III four-speed gearbox, detailing the casing, declutching gear, and method for preventing rotation of the reverse shaft bearing. | 27th Aug 1924 | Box 5 \ 4 04-page142 | |
| Letter discussing experiments with the Goshawk starter carburetter for improved slow running on the EAC.2 chassis. | 16th Oct 1924 | Box 5 \ 4 04-page143 | |
| Required weight for a 20 HP engine's float for use with Benzol fuel. | 1st Jan 1925 | Box 5 \ 4 04-page144 | |
| Schedule of alterations for the 20 HP carburetter as requested by Mr. Royce. | 12th Aug 1925 | Box 5 \ 4 04-page145 | |
| Changing 20 HP and 40 HP filters in the back tank and carburettors to a fine mesh to solve choked jets. | 25th Aug 1925 | Box 5 \ 4 04-page146 | |
| Modifications to a 20 HP carburetter and the fitting of cutouts. | 25th Aug 1925 | Box 5 \ 4 04-page147 | |
| Carburetter modifications for the 20 HP car to increase power and address performance issues. | 10th Sep 1925 | Box 5 \ 4 04-page148 | |
| Solutions for a broken flange on a Goshawk induction pipe and proposing further tests. | 14th Sep 1925 | Box 5 \ 4 04-page149 | |
| Attempts to increase power on the 20 HP engine and details of chassis weight increases. | 17th Feb 1926 | Box 5 \ 4 04-page150 | |
| Experiments on a 20 HP engine to determine if power output can be increased by using a larger carburetter and induction passage. | 17th Feb 1926 | Box 5 \ 4 04-page151 | |
| Engine power output tests comparing standard and large carburettor throttle sizes and throat sizes. | 17th Feb 1926 | Box 5 \ 4 04-page152 | |
| Carburetter metering issues and maximum power tests on a 20 HP engine. | 17th Feb 1926 | Box 5 \ 4 04-page153 | |
| Test report page comparing a standard carburetter with a diffuser jet carburetter, including a performance graph. | 17th Feb 1926 | Box 5 \ 4 04-page154 | |
| Carburettor experiments, comparing a diffuser and a light aluminium air valve against standard components. | 17th Feb 1926 | Box 5 \ 4 04-page155 | |
| Experiments with carburetter throat size and diffuser jets to increase power in the 20 HP engine. | 11th Jan 1926 | Box 5 \ 4 04-page156 | |
| Proposal to revert to the original method of fixing the spring in the air valve to improve reliability. | 11th Jan 1926 | Box 5 \ 4 04-page157 | |
| Complaint about leakages from the window on the 20 HP carburetter float chamber, suggesting its removal. | 1st Aug 1926 | Box 5 \ 4 04-page158 | |
| Proposal and approval to delete the window in the float chamber to prevent leaks. | 5th Mar 1926 | Box 5 \ 4 04-page159 | |
| Improvement to the carburetter for the 20 HP model. | 18th Mar 1926 | Box 5 \ 4 04-page160 | |
| Test report comparing a new light aluminium air valve with the standard brass valve for a 20 HP carburetter. | 17th Mar 1926 | Box 5 \ 4 04-page161 | |
| Performance analysis chart and text for a 20HP carburettor, detailing mixture control against engine RPM. | 17th Mar 1926 | Box 5 \ 4 04-page162 | |
| Method for developing carburetter air ports using an adjustable test rig to achieve the correct mixture. | 17th Mar 1926 | Box 5 \ 4 04-page163 | |
| Carburetter development, detailing the relationship between depression and air valve lift, port design, and results from a 10,000-mile road test. | 17th Mar 1926 | Box 5 \ 4 04-page164 | |
| Report page discussing carburettor jet performance, with blueprint diagrams of an adjustable carburettor and high-speed choke. | 23th Mar 1926 | Box 5 \ 4 04-page165 | |
| Need for a locking device on a float chamber lid for carburetters. | 23th Mar 1926 | Box 5 \ 4 04-page166 | |
| Addition of locks for the float chamber lid on the 20 HP model. | 26th Mar 1926 | Box 5 \ 4 04-page167 | |
| Alterations for a 20 HP, 10,000-mile car currently in France. | 31th Mar 1926 | Box 5 \ 4 04-page168 | |
| Request to produce designs for locking the float chamber lids for two chassis. | 16th Apr 1926 | Box 5 \ 4 04-page169 | |
| Approval for testing schemes for float chamber cover locking devices on Phantom & 20 HP models. | 3rd Jul 1926 | Box 5 \ 4 04-page170 | |
| Request for a new anti-detonating cylinder head casting for a 20 HP engine. | 11th Aug 1926 | Box 5 \ 4 04-page171 | |
| Proposing to swap and compare carburetters and induction systems between a Lorraine car and a 20 HP chassis. | 9th Nov 1926 | Box 5 \ 4 04-page172 | |
| Customer complaint for vehicle GOK-75 regarding weakness of carburation and poor performance. | 1st Jan 1927 | Box 5 \ 4 04-page173 | |
| Need to examine choked petrol jets to understand the necessary filter type. | 1st Jan 1927 | Box 5 \ 4 04-page174 | |
| Investigation into choked jets on a 20 HP model, and the dispatch of a fluff sample for analysis. | 11th Jan 1927 | Box 5 \ 4 04-page175 | |
| Various induction pipe and carburettor configurations for the Phantom engine. | 20th Feb 1927 | Box 5 \ 4 04-page176 | |
| Use of gauze filters versus slit filters for the Phantom and 20 HP models. | 2nd Mar 1927 | Box 5 \ 4 04-page177 | |
| Choking of low speed carburettor jets on a 20 HP car, chassis GYK-48. | 15th Mar 1927 | Box 5 \ 4 04-page178 | |
| The finish of 30 HP low-speed jets. | 16th Mar 1927 | Box 5 \ 4 04-page179 | |
| Instructions and parts list for a carburetter modification on a 20HP Chassis. | 22th Apr 1927 | Box 5 \ 4 04-page180 | |
| Letter to Stromberg Motor Devices Ltd. requesting to test their carburetters on a 20 HP car engine. | 28th May 1927 | Box 5 \ 4 04-page181 | |
| Continuation of a letter discussing desired carburetter performance features and trials. | 7th Sep 1927 | Box 5 \ 4 04-page182 | |
| Suggestion for improving an air valve to prevent corrosion and sticking by using cathode treatment or a different alloy. | 7th Sep 1927 | Box 5 \ 4 04-page183 | |
| Experiments with Phantom carburetters concerning high induction pipe depressions and power output. | 19th Sep 1927 | Box 5 \ 4 04-page184 | |
| Carburettor performance, comparing a 'straight through' type with existing Claudel and Zenith systems on Phantom, Goshawk and 20 HP models. | 19th Sep 1927 | Box 5 \ 4 04-page185 | |
| Summary of carburetter test results for the Phantom and 20 HP models, discussing power gains and future testing. | 9th Oct 1923 | Box 5 \ 4 04-page186 | |
| Power curve graph for the Lighting Phantom engine, showing an increase due to a low deflection carburettor. | 9th Oct 1923 | Box 5 \ 4 04-page187 | |
| Power curve graph for a Phantom engine, showing the increase due to larger chokes in the carburettor. | 23th Sep 1927 | Box 5 \ 4 04-page188 | |
| Customer's report on a choked low-speed carburettor jet on a 20 HP model. | 23th Sep 1927 | Box 5 \ 4 04-page189 | |
| BJ to Hs returning a signed standardisation sheet regarding mixture control on the column. | 1st Oct 1927 | Box 5 \ 4 04-page190 | |
| Standardisation of chassis parts, specifically the mixture control on the column. | 23th May 1927 | Box 5 \ 4 04-page191 | |
| Introduction of a new part for the 'M' Series chassis, including test date and costs. | 1st Apr 1928 | Box 5 \ 4 04-page192 | |
| Whistling noise from 20HP carburettors and a proposed modification. | 16th Jan 1928 | Box 5 \ 4 04-page193 | |
| Modification of the throttle valve drawing for the 20 HP chassis carburetter. | 18th Jan 1928 | Box 5 \ 4 04-page194 | |
| Sending drawings Lec. 2627 and 2630 related to India 4 controls. | 1st Jan 1929 | Box 5 \ 4 04-page195 | |
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