| Description | Date | Identifier | |
| Carburetter performance, detailing issues with idling mixture and comparing different metering schemes. | 15th May 1931 | Box 13 \ 3 03-page316 | |
| Description of the slow running scheme, easy starting scheme, and accelerator pump for a Zenith 36 D.U.P. double choke carburetter. | 15th May 1931 | Box 13 \ 3 03-page317 | |
| Carburettor components including the accelerator pump, slow running unit, and Zenith float. | 1st May 1931 | Box 13 \ 3 03-page318 | |
| Diagram of a Phantom II Twin Choke Carburetor indicating adjustment points. | 15th May 1929 | Box 13 \ 3 03-page319 | |
| Blueprint detailing a modification for slow running on Phantom II twin choke carburettors. | 15th May 1929 | Box 13 \ 3 03-page320 | |
| Schematic diagram of a Zenith slow running system. | 25th May 1931 | Box 13 \ 3 03-page321 | |
| High-speed engine experiments, discussing performance, carburettors, component layout, and vibration mitigation. | 28th May 1931 | Box 13 \ 3 03-page322 | |
| Analysis of different carburetter arrangements and their performance results for the Phantom II and 25 HP models. | 7th Jul 1931 | Box 13 \ 3 03-page323 | |
| Engine performance, ramming, carburation, and cylinder head design. | 7th Jul 1931 | Box 13 \ 3 03-page324 | |
| Progress report on engine development, comparing different designs ('Japan' and 'China') and discussing ongoing experiments. | 1st Jul 1931 | Box 13 \ 3 03-page325 | |
| Performance graph comparing various carburettor arrangements on a Phantom II engine with an aluminium head. | 8th Jul 1931 | Box 13 \ 3 03-page326 | |
| Twin carburetter options and a new universal pipe design for Phantom & Japan models. | 8th Jul 1931 | Box 13 \ 3 03-page327 | |
| Experiments comparing different carburetter arrangements for a car engine. | 11th Jul 1931 | Box 13 \ 3 03-page328 | |
| Various carburettor arrangements, including Claudel and Zenith types, and their performance on the 40/50 model. | 11th Jul 1931 | Box 13 \ 3 03-page329 | |
| Technical note on the characteristics and slow running of S.U. carburettors. | 11th Jul 1931 | Box 13 \ 3 03-page330 | |
| Performance comparison graph of various carburettor arrangements for a Phantom II engine with an aluminium head. | 10th Jul 1931 | Box 13 \ 3 03-page331 | |
| Performance comparison graph for different carburettor arrangements on a 25 HP engine. | 10th Jul 1931 | Box 13 \ 3 03-page332 | |
| Pros and cons of different carburetter arrangements for a 6-cylinder car. | 13th Jul 1931 | Box 13 \ 3 03-page333 | |
| The development and performance of an air intake silencer for a Phantom II twin choke carburetter. | 2nd Aug 1931 | Box 13 \ 3 03-page334 | |
| Blueprint for a Phantom II twin carburettor air silencer. | 19th Aug 1932 | Box 13 \ 3 03-page335 | |
| Reluctance to change the existing carburetter and the need for personal testing of any new specimen. | 20th Aug 1931 | Box 13 \ 3 03-page336 | |
| Outlining the requirements and design considerations for twin and 25HP carburetters. | 25th Aug 1931 | Box 13 \ 3 03-page337 | |
| Exhaust heating and carburation requirements for cold climates like the USA. | 31th Aug 1931 | Box 13 \ 3 03-page338 | |
| The decision not to proceed with the production of an induction pipe for a down-draught carburetter. | 31th Aug 1931 | Box 13 \ 3 03-page339 | |
| List of modifications for Phantom ll twin carburetters. | 3rd Sep 1931 | Box 13 \ 3 03-page340 | |
| Tests of twin carburetters for the Phantom II, specifically modifying the float design to prevent flooding. | 7th Sep 1931 | Box 13 \ 3 03-page341 | |
| Carburetter adjustments and design modifications for improving slow running performance. | 7th Sep 1931 | Box 13 \ 3 03-page342 | |
| Modifications to variable valves and diffusers to improve mixture range, metering, and power. | 17th Sep 1931 | Box 13 \ 3 03-page343 | |
| Schematic drawing of a slow running scheme for a twin choke carburettor. | 24th Feb 1931 | Box 13 \ 3 03-page344 | |
| Suggesting a modification to the twin choke carburetter on the P.2. to overcome a difficulty with the petrol level. | 9th Sep 1931 | Box 13 \ 3 03-page345 | |
| Technical note regarding an issue with the float weight in twin carburettors. | 24th Sep 1931 | Box 13 \ 3 03-page346 | |
| Trials, development, and comparison of various carburettor designs. | 28th Sep 1931 | Box 13 \ 3 03-page347 | |
| Challenges and requirements for fitting a large S.U. carburetter to a Phantom II. | 10th Oct 1931 | Box 13 \ 3 03-page348 | |
| Effects of different choke sizes on a Phantom II single carburetter. | 9th Oct 1931 | Box 13 \ 3 03-page349 | |
| Graph showing Brake Horsepower and Depression curves from experiments with various choke sizes on a Half Solex twin carburetter. | 18th Oct 1931 | Box 13 \ 3 03-page350 | |
| Modifications to the float mechanism for P.2 Twin Choke Carburetters. | 18th Oct 1931 | Box 13 \ 3 03-page351 | |
| Graph of engine BHP and induction depression versus RPM, comparing performance with two different carburetter choke sizes. | 10th Oct 1931 | Box 13 \ 3 03-page352 | |
| Comparing the specifications of a Claudel carburetter with the performance of an S.U. carburetter on a different engine. | 10th Oct 1931 | Box 13 \ 3 03-page353 | |
| Power output difference between balanced and unbalanced twin carburettors, referencing curve Rm.P30. | 2nd Oct 1931 | Box 13 \ 3 03-page354 | |
| Blueprint graph comparing the power output of balanced versus unbalanced twin carburettors. | 15th Oct 1931 | Box 13 \ 3 03-page355 | |
| Spring control for a 25 HP starter carburetter and potential modifications for 20/25 and 40/50 models. | 15th Oct 1931 | Box 13 \ 3 03-page356 | |
| Instructions for modifications to the Twin Choke Carburetter designs LeC's 2960 and 2962. | 30th Oct 1931 | Box 13 \ 3 03-page357 | |
| Continued memo detailing modifications to a slow-speed jet and petrol passages. | 30th Oct 1931 | Box 13 \ 3 03-page358 | |
| Development of a new single carburettor design to replace the S.U. pattern. | 19th Nov 1931 | Box 13 \ 3 03-page359 | |
| Extract from a memo discussing the design and selection of carburettors for car work. | 10th Nov 1931 | Box 13 \ 3 03-page360 | |
| Advance print for an expanding updraught single choke carburetter for the continental Phantom. | 14th Nov 1931 | Box 13 \ 3 03-page361 | |
| Technical discussion on various carburettor configurations for 6-cylinder engines. | 16th Nov 1931 | Box 13 \ 3 03-page362 | |
| Standardisation report for an air silencer carburetter. | 3rd Oct 1930 | Box 13 \ 3 03-page363 | |
| Scheme of controls for a new type of expanding carburetter to be adapted for the Phantom. | 24th Nov 1931 | Box 13 \ 3 03-page364 | |
| Pros and cons of single versus dual carburetters for a 6-cylinder engine. | 28th Nov 1931 | Box 13 \ 3 03-page365 | |
| Use of a double-hole type eccentric plug adjuster over a single-hole type for P.2 twin carburettors. | 30th Nov 1931 | Box 13 \ 3 03-page366 | |
| Modifications for carburettor hot spots on the Phantom II Continental model. | 30th Nov 1931 | Box 13 \ 3 03-page367 | |
| Blueprint of an induction pipe for twin S.U. carburetters on a P.2 chassis. | 2nd Dec 1931 | Box 13 \ 3 03-page368 | |
| Test results for a higher compression 40/50 cylinder head comparing different carburetters. | 8th Dec 1931 | Box 13 \ 3 03-page369 | |
| Graph comparing engine performance characteristics for two different compression ratios. | 2nd Dec 1931 | Box 13 \ 3 03-page370 | |
| Blueprint graph comparing engine performance with two different compression ratios. | 8th Dec 1931 | Box 13 \ 3 03-page371 | |
| Series of tests conducted to eliminate the phenomenon of induction pipe power roar. | 12th Dec 1931 | Box 13 \ 3 03-page372 | |
| Induction pipe and carburettor arrangement tests, with accompanying blueprint sketches. | 12th Dec 1931 | Box 13 \ 3 03-page373 | |
| Report with sketches detailing experiments on induction pipes and carburetors to reduce engine roar. | 12th Dec 1931 | Box 13 \ 3 03-page374 | |
| Carburetter and induction pipe performance tests, including a blueprint for a single S.U. induction pipe. | 12th Dec 1931 | Box 13 \ 3 03-page375 | |
| Carburetter and silencer testing, including performance notes and proposed modifications. | 12th Dec 1931 | Box 13 \ 3 03-page376 | |
| Photograph showing the left side of an automobile engine installed in a chassis. | 12th Dec 1931 | Box 13 \ 3 03-page377 | |
| Photograph of an engine bay focusing on twin carburettors with large circular air cleaners. | 12th Dec 1931 | Box 13 \ 3 03-page378 | |
| Photograph of an engine bay, focusing on the large circular air cleaner and radiator. | 27th Nov 1931 | Box 13 \ 3 03-page379 | |
| Graph showing the effect of induction pipe diameter on twin carburettor engine performance. | 27th Nov 1931 | Box 13 \ 3 03-page380 | |
| Photograph of a car engine bay, showing the air cleaner, radiator, and fan assembly. | 29th Jan 1932 | Box 13 \ 3 03-page381 | |
| Testing of a single expanding carburetter. | 29th Jan 1932 | Box 13 \ 3 03-page382 | |
| Preliminary test report on the Phantom 11 Expanding Carburetter. | 12th Feb 1932 | Box 13 \ 3 03-page383 | |
| Carburettor performance issues and development, focusing on fuel metering and potential leaks. | 17th Feb 1932 | Box 13 \ 3 03-page384 | |
| Performance comparison graph between a single SU carburetor and an RR updraught expanding carburetor. | 17th Feb 1932 | Box 13 \ 3 03-page385 | |
| Requesting the construction and modification of a new Phantom vertical expanding carburetter for testing. | 19th Feb 1932 | Box 13 \ 3 03-page386 | |
| Test results for the Phantom II expanding type carburettors. | 3rd Feb 1932 | Box 13 \ 3 03-page387 | |
| Carburettor modifications and performance evaluation to address insufficient fuel supply. | 23th Feb 1932 | Box 13 \ 3 03-page388 | |
| Features and performance of various carburettor types for the Phantom model. | 29th Feb 1932 | Box 13 \ 3 03-page389 | |
| Valve timing, considering excessive overlap, cam specifications, and tappet clearance. | 3rd Mar 1932 | Box 13 \ 3 03-page390 | |
| Merits of single versus dual carburettors and the development of a new expanding carburetter. | 3rd Mar 1932 | Box 13 \ 3 03-page391 | |
| Tests conducted on the Phantom II expanding carburetter to improve opening up from idling speeds. | 3rd Mar 1932 | Box 13 \ 3 03-page392 | |
| Technical report on carburettor testing, focusing on acceleration issues, slow-running fuel supply, and proposed choke modifications. | 3rd Mar 1932 | Box 13 \ 3 03-page393 | |
| Page outlining modifications to a carburettor's air piston and slow running fuel system. | 3rd Mar 1932 | Box 13 \ 3 03-page394 | |
| Design of a P.2 semi-expanding carburetter, including historical context and solutions for snap acceleration. | 12th Mar 1932 | Box 13 \ 3 03-page395 | |
| Comparing the performance and practicality of various carburettor configurations for Continental Phantom & 25HP models. | 3rd Mar 1932 | Box 13 \ 3 03-page396 | |
| Design sketch with annotations for a valve arrangement, discussing modifications to control lift and suction. | 15th Mar 1932 | Box 13 \ 3 03-page397 | |
| List of main modifications for the R.R. Semi-Expanding Carburetter - PH.II, sent with blueprint LEC.3026. | 15th Mar 1932 | Box 13 \ 3 03-page398 | |
| Two designs for an air valve for a Semi-Expanding Carburettor, Phase 2. | 17th Mar 1932 | Box 13 \ 3 03-page399 | |
| Continued tests of a Phantom II semi-expanding carburetter, focusing on acceleration and 'snap opening'. | 19th Mar 1932 | Box 13 \ 3 03-page400 | |
| Testing and performance of different carburettor suction piston designs. | 19th Mar 1932 | Box 13 \ 3 03-page401 | |
| Carburetter sticking issues and proposed modifications for improved performance. | 19th Mar 1932 | Box 13 \ 3 03-page402 | |
| List of modifications to a carburetter, detailing changes to various components and their dimensions. | 19th Mar 1932 | Box 13 \ 3 03-page403 | |
| Continuation of notes on carburetter modifications, specifically the hot spot, needle valve, and air valve performance. | 14th Dec 1932 | Box 13 \ 3 03-page404 | |
| Blueprint for a modification to a piston for an experimental carburettor. | 10th Mar 1932 | Box 13 \ 3 03-page405 | |
| Requesting a new Phantom II semi-expanding carburetter with the latest modifications. | 23th Mar 1932 | Box 13 \ 3 03-page406 | |
| Design considerations and suggestions for a semi-expanding carburetter. | 29th Mar 1932 | Box 13 \ 3 03-page407 | |
| Three potential modifications to reduce air valve lift in a semi-expanding carburetter. | 29th Mar 1932 | Box 13 \ 3 03-page408 | |
| The development and testing of a new air piston for a B.11 semi-expanding carburettor. | 5th Apr 1932 | Box 13 \ 3 03-page409 | |
| Page from a memo discussing the need for road testing on a chassis to identify issues missed on the test bench. | 5th Apr 1932 | Box 13 \ 3 03-page410 | |
| Requesting a shorter hot spot junction piece to fit a P.2 expanding carburetter for road tests on a 20-EX chassis. | 7th Apr 1932 | Box 13 \ 3 03-page411 | |
| Modifications to be carried out on the Phantom II Semi Expanding Carburettor (LeC.3026). | 11th Apr 1932 | Box 13 \ 3 03-page412 | |
| Confirming the completion of design work for fitting the Phantom II Semi-Expanding Carburetter. | 12th Apr 1932 | Box 13 \ 3 03-page413 | |
| Design alteration for the cap on the Air Valve Guide of the Semi-Expanding Carburettor, Phase II. | 15th Apr 1932 | Box 13 \ 3 03-page414 | |
| Carburettor floats being too light and proposing a trial with a heavier gauge material. | 15th Apr 1932 | Box 13 \ 3 03-page415 | |
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