Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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Carburetter performance, detailing issues with idling mixture and comparing different metering schemes.15th May 1931Box 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 1931Box 13 \ 3  03-page317
Carburettor components including the accelerator pump, slow running unit, and Zenith float.1st May 1931Box 13 \ 3  03-page318
Diagram of a Phantom II Twin Choke Carburetor indicating adjustment points.15th May 1929Box 13 \ 3  03-page319
Blueprint detailing a modification for slow running on Phantom II twin choke carburettors.15th May 1929Box 13 \ 3  03-page320
Schematic diagram of a Zenith slow running system.25th May 1931Box 13 \ 3  03-page321
High-speed engine experiments, discussing performance, carburettors, component layout, and vibration mitigation.28th May 1931Box 13 \ 3  03-page322
Analysis of different carburetter arrangements and their performance results for the Phantom II and 25 HP models.7th Jul 1931Box 13 \ 3  03-page323
Engine performance, ramming, carburation, and cylinder head design.7th Jul 1931Box 13 \ 3  03-page324
Progress report on engine development, comparing different designs ('Japan' and 'China') and discussing ongoing experiments.1st Jul 1931Box 13 \ 3  03-page325
Performance graph comparing various carburettor arrangements on a Phantom II engine with an aluminium head.8th Jul 1931Box 13 \ 3  03-page326
Twin carburetter options and a new universal pipe design for Phantom & Japan models.8th Jul 1931Box 13 \ 3  03-page327
Experiments comparing different carburetter arrangements for a car engine.11th Jul 1931Box 13 \ 3  03-page328
Various carburettor arrangements, including Claudel and Zenith types, and their performance on the 40/50 model.11th Jul 1931Box 13 \ 3  03-page329
Technical note on the characteristics and slow running of S.U. carburettors.11th Jul 1931Box 13 \ 3  03-page330
Performance comparison graph of various carburettor arrangements for a Phantom II engine with an aluminium head.10th Jul 1931Box 13 \ 3  03-page331
Performance comparison graph for different carburettor arrangements on a 25 HP engine.10th Jul 1931Box 13 \ 3  03-page332
Pros and cons of different carburetter arrangements for a 6-cylinder car.13th Jul 1931Box 13 \ 3  03-page333
The development and performance of an air intake silencer for a Phantom II twin choke carburetter.2nd Aug 1931Box 13 \ 3  03-page334
Blueprint for a Phantom II twin carburettor air silencer.19th Aug 1932Box 13 \ 3  03-page335
Reluctance to change the existing carburetter and the need for personal testing of any new specimen.20th Aug 1931Box 13 \ 3  03-page336
Outlining the requirements and design considerations for twin and 25HP carburetters.25th Aug 1931Box 13 \ 3  03-page337
Exhaust heating and carburation requirements for cold climates like the USA.31th Aug 1931Box 13 \ 3  03-page338
The decision not to proceed with the production of an induction pipe for a down-draught carburetter.31th Aug 1931Box 13 \ 3  03-page339
List of modifications for Phantom ll twin carburetters.3rd Sep 1931Box 13 \ 3  03-page340
Tests of twin carburetters for the Phantom II, specifically modifying the float design to prevent flooding.7th Sep 1931Box 13 \ 3  03-page341
Carburetter adjustments and design modifications for improving slow running performance.7th Sep 1931Box 13 \ 3  03-page342
Modifications to variable valves and diffusers to improve mixture range, metering, and power.17th Sep 1931Box 13 \ 3  03-page343
Schematic drawing of a slow running scheme for a twin choke carburettor.24th Feb 1931Box 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 1931Box 13 \ 3  03-page345
Technical note regarding an issue with the float weight in twin carburettors.24th Sep 1931Box 13 \ 3  03-page346
Trials, development, and comparison of various carburettor designs.28th Sep 1931Box 13 \ 3  03-page347
Challenges and requirements for fitting a large S.U. carburetter to a Phantom II.10th Oct 1931Box 13 \ 3  03-page348
Effects of different choke sizes on a Phantom II single carburetter.9th Oct 1931Box 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 1931Box 13 \ 3  03-page350
Modifications to the float mechanism for P.2 Twin Choke Carburetters.18th Oct 1931Box 13 \ 3  03-page351
Graph of engine BHP and induction depression versus RPM, comparing performance with two different carburetter choke sizes.10th Oct 1931Box 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 1931Box 13 \ 3  03-page353
Power output difference between balanced and unbalanced twin carburettors, referencing curve Rm.P30.2nd Oct 1931Box 13 \ 3  03-page354
Blueprint graph comparing the power output of balanced versus unbalanced twin carburettors.15th Oct 1931Box 13 \ 3  03-page355
Spring control for a 25 HP starter carburetter and potential modifications for 20/25 and 40/50 models.15th Oct 1931Box 13 \ 3  03-page356
Instructions for modifications to the Twin Choke Carburetter designs LeC's 2960 and 2962.30th Oct 1931Box 13 \ 3  03-page357
Continued memo detailing modifications to a slow-speed jet and petrol passages.30th Oct 1931Box 13 \ 3  03-page358
Development of a new single carburettor design to replace the S.U. pattern.19th Nov 1931Box 13 \ 3  03-page359
Extract from a memo discussing the design and selection of carburettors for car work.10th Nov 1931Box 13 \ 3  03-page360
Advance print for an expanding updraught single choke carburetter for the continental Phantom.14th Nov 1931Box 13 \ 3  03-page361
Technical discussion on various carburettor configurations for 6-cylinder engines.16th Nov 1931Box 13 \ 3  03-page362
Standardisation report for an air silencer carburetter.3rd Oct 1930Box 13 \ 3  03-page363
Scheme of controls for a new type of expanding carburetter to be adapted for the Phantom.24th Nov 1931Box 13 \ 3  03-page364
Pros and cons of single versus dual carburetters for a 6-cylinder engine.28th Nov 1931Box 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 1931Box 13 \ 3  03-page366
Modifications for carburettor hot spots on the Phantom II Continental model.30th Nov 1931Box 13 \ 3  03-page367
Blueprint of an induction pipe for twin S.U. carburetters on a P.2 chassis.2nd Dec 1931Box 13 \ 3  03-page368
Test results for a higher compression 40/50 cylinder head comparing different carburetters.8th Dec 1931Box 13 \ 3  03-page369
Graph comparing engine performance characteristics for two different compression ratios.2nd Dec 1931Box 13 \ 3  03-page370
Blueprint graph comparing engine performance with two different compression ratios.8th Dec 1931Box 13 \ 3  03-page371
Series of tests conducted to eliminate the phenomenon of induction pipe power roar.12th Dec 1931Box 13 \ 3  03-page372
Induction pipe and carburettor arrangement tests, with accompanying blueprint sketches.12th Dec 1931Box 13 \ 3  03-page373
Report with sketches detailing experiments on induction pipes and carburetors to reduce engine roar.12th Dec 1931Box 13 \ 3  03-page374
Carburetter and induction pipe performance tests, including a blueprint for a single S.U. induction pipe.12th Dec 1931Box 13 \ 3  03-page375
Carburetter and silencer testing, including performance notes and proposed modifications.12th Dec 1931Box 13 \ 3  03-page376
Photograph showing the left side of an automobile engine installed in a chassis.12th Dec 1931Box 13 \ 3  03-page377
Photograph of an engine bay focusing on twin carburettors with large circular air cleaners.12th Dec 1931Box 13 \ 3  03-page378
Photograph of an engine bay, focusing on the large circular air cleaner and radiator.27th Nov 1931Box 13 \ 3  03-page379
Graph showing the effect of induction pipe diameter on twin carburettor engine performance.27th Nov 1931Box 13 \ 3  03-page380
Photograph of a car engine bay, showing the air cleaner, radiator, and fan assembly.29th Jan 1932Box 13 \ 3  03-page381
Testing of a single expanding carburetter.29th Jan 1932Box 13 \ 3  03-page382
Preliminary test report on the Phantom 11 Expanding Carburetter.12th Feb 1932Box 13 \ 3  03-page383
Carburettor performance issues and development, focusing on fuel metering and potential leaks.17th Feb 1932Box 13 \ 3  03-page384
Performance comparison graph between a single SU carburetor and an RR updraught expanding carburetor.17th Feb 1932Box 13 \ 3  03-page385
Requesting the construction and modification of a new Phantom vertical expanding carburetter for testing.19th Feb 1932Box 13 \ 3  03-page386
Test results for the Phantom II expanding type carburettors.3rd Feb 1932Box 13 \ 3  03-page387
Carburettor modifications and performance evaluation to address insufficient fuel supply.23th Feb 1932Box 13 \ 3  03-page388
Features and performance of various carburettor types for the Phantom model.29th Feb 1932Box 13 \ 3  03-page389
Valve timing, considering excessive overlap, cam specifications, and tappet clearance.3rd Mar 1932Box 13 \ 3  03-page390
Merits of single versus dual carburettors and the development of a new expanding carburetter.3rd Mar 1932Box 13 \ 3  03-page391
Tests conducted on the Phantom II expanding carburetter to improve opening up from idling speeds.3rd Mar 1932Box 13 \ 3  03-page392
Technical report on carburettor testing, focusing on acceleration issues, slow-running fuel supply, and proposed choke modifications.3rd Mar 1932Box 13 \ 3  03-page393
Page outlining modifications to a carburettor's air piston and slow running fuel system.3rd Mar 1932Box 13 \ 3  03-page394
Design of a P.2 semi-expanding carburetter, including historical context and solutions for snap acceleration.12th Mar 1932Box 13 \ 3  03-page395
Comparing the performance and practicality of various carburettor configurations for Continental Phantom & 25HP models.3rd Mar 1932Box 13 \ 3  03-page396
Design sketch with annotations for a valve arrangement, discussing modifications to control lift and suction.15th Mar 1932Box 13 \ 3  03-page397
List of main modifications for the R.R. Semi-Expanding Carburetter - PH.II, sent with blueprint LEC.3026.15th Mar 1932Box 13 \ 3  03-page398
Two designs for an air valve for a Semi-Expanding Carburettor, Phase 2.17th Mar 1932Box 13 \ 3  03-page399
Continued tests of a Phantom II semi-expanding carburetter, focusing on acceleration and 'snap opening'.19th Mar 1932Box 13 \ 3  03-page400
Testing and performance of different carburettor suction piston designs.19th Mar 1932Box 13 \ 3  03-page401
Carburetter sticking issues and proposed modifications for improved performance.19th Mar 1932Box 13 \ 3  03-page402
List of modifications to a carburetter, detailing changes to various components and their dimensions.19th Mar 1932Box 13 \ 3  03-page403
Continuation of notes on carburetter modifications, specifically the hot spot, needle valve, and air valve performance.14th Dec 1932Box 13 \ 3  03-page404
Blueprint for a modification to a piston for an experimental carburettor.10th Mar 1932Box 13 \ 3  03-page405
Requesting a new Phantom II semi-expanding carburetter with the latest modifications.23th Mar 1932Box 13 \ 3  03-page406
Design considerations and suggestions for a semi-expanding carburetter.29th Mar 1932Box 13 \ 3  03-page407
Three potential modifications to reduce air valve lift in a semi-expanding carburetter.29th Mar 1932Box 13 \ 3  03-page408
The development and testing of a new air piston for a B.11 semi-expanding carburettor.5th Apr 1932Box 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 1932Box 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 1932Box 13 \ 3  03-page411
Modifications to be carried out on the Phantom II Semi Expanding Carburettor (LeC.3026).11th Apr 1932Box 13 \ 3  03-page412
Confirming the completion of design work for fitting the Phantom II Semi-Expanding Carburetter.12th Apr 1932Box 13 \ 3  03-page413
Design alteration for the cap on the Air Valve Guide of the Semi-Expanding Carburettor, Phase II.15th Apr 1932Box 13 \ 3  03-page414
Carburettor floats being too light and proposing a trial with a heavier gauge material.15th Apr 1932Box 13 \ 3  03-page415


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