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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DescriptionDateIdentifier
Comparing the power output of an experimental induction pipe versus a production induction pipe.27th Mar 1931Box 13 \ 3  03-page216
Carburetter silencer design, suggesting experiments for oil discharge and a modification for power loss.1st Jun 1930Box 13 \ 3  03-page217
Modifications to the carburetter silencer to reduce power loss at high speed.4th Jun 1930Box 13 \ 3  03-page218
Temperature tests and issues found during trials at Brooklands.11th Jun 1930Box 13 \ 3  03-page219
Acceleration test results comparing a standard carburetter with an air silencer carburetter.1st Sep 1930Box 13 \ 3  03-page220
Steering tests conducted at Brooklands with different tyre types and pressures.4th Jun 1930Box 13 \ 3  03-page221
Test report on Dunlop Silent Tyres, evaluating steering and ride quality at various pressures and with different wheel setups.8th Jul 1930Box 13 \ 3  03-page222
Progress report on the design of double carburettors for the P. 2 engine.8th Jul 1930Box 13 \ 3  03-page223
The production of an experimental induction pipe for the P. 2 research project.11th Jul 1931Box 13 \ 3  03-page224
Increasing petrol consumption and proposing tests on carburetter performance.10th Jul 1930Box 13 \ 3  03-page225
Standardisation report on a new union in the feed pipe to the carburetter.6th Jun 1930Box 13 \ 3  03-page226
Design suggestions for a non-expanding carburettor, specifically the accelerator pump mechanism.23th Jul 1930Box 13 \ 3  03-page227
The function of an accelerator pump and a starting device for a carburetter system.23th Jul 1930Box 13 \ 3  03-page228
Typed note discussing the operation and design of a P.2. non-expanding carburetter, referencing blueprints.25th Jul 1930Box 13 \ 3  03-page229
Arrangement of controls for the starting carburetter using a universal joint.25th Jul 1930Box 13 \ 3  03-page230
Proposal to put the starting carburetter control stop on the dashboard.21th Aug 1930Box 13 \ 3  03-page231
Whether improved car performance is due to drilling an air-valve or advanced ignition timing.28th Jul 1930Box 13 \ 3  03-page232
Design memo detailing the features of the P.2 Twin Carburetters, page 2.21th Aug 1930Box 13 \ 3  03-page233
Sending of drawings for twin carburetters for the Phantom chassis.23th Aug 1930Box 13 \ 3  03-page234
Induction pipe and hot spot for the twin carburetter on a Phantom II.31th Aug 1930Box 13 \ 3  03-page235
Requesting an estimated timeline for the commencement of testing on new carburetters.3rd Sep 1930Box 13 \ 3  03-page236
Providing a timeline estimate for the testing and drawing of Phantom II twin carburetters.5th Sep 1930Box 13 \ 3  03-page237
Revising the delivery time for Phantom II twin carburettors.6th Sep 1930Box 13 \ 3  03-page238
Modification of a carburetter with an air maze gauze screen for cars in Australia.9th Sep 1930Box 13 \ 3  03-page239
Outstanding issues with the Phantom II Left Hand Chassis following 10,000 miles of testing.9th Sep 1930Box 13 \ 3  03-page240
Modifications to the clutch, carburettor, and brakes for experimental cars.17th Sep 1930Box 13 \ 3  03-page241
Confirming the completion of design work for twin carburetter controls.17th Sep 1930Box 13 \ 3  03-page242
Modifying car 58-GN's springing and fitting a carburetter with an air silencer, compromising power for reduced engine noise.13th Oct 1930Box 13 \ 3  03-page243
The finalisation of the Phantom II carburetter air intake design, pending high-speed tests.13th Oct 1930Box 13 \ 3  03-page244
Tests to determine the necessary degree of silencing for the Phantom II carburettor air intake.22th Oct 1930Box 13 \ 3  03-page245
Alterations to a carburetter and silencer system, detailing the effects on power loss and noise levels.22th Oct 1930Box 13 \ 3  03-page246
The condition of tests comparing lap speeds for various carburettor and air silencer configurations.22th Oct 1930Box 13 \ 3  03-page247
Performance test results comparing an air maze and an air silencer, with speed and acceleration tests on a 19-MX car.22th Oct 1930Box 13 \ 3  03-page248
Air silencer tests, comparing different baffle designs and proposing a new standard for Phantom II cars.22th Oct 1930Box 13 \ 3  03-page249
Continued document page discussing how three outer baffles stop dust from being drawn into the carburetter.22th Oct 1930Box 13 \ 3  03-page250
Graph comparing the performance (B.HP vs Engine R.P.M.) of standard vs. air silenced carburettors.22th Oct 1930Box 13 \ 3  03-page251
Blueprint diagram of a Carburetter Air Silencer P.I. showing modifications.29th Oct 1930Box 13 \ 3  03-page252
The standardisation of a silencer for the carburetter on the Phantom II car.29th Oct 1930Box 13 \ 3  03-page253
Standardisation arrangement for fitting a carburetter silencer to both home and American chassis.29th Oct 1930Box 13 \ 3  03-page254
Standardisation of a carburetter silencer for home and American markets.29th Oct 1930Box 13 \ 3  03-page255
Proposal to standardise the Air Silencer Carburetter for both English and American use.10th Oct 1930Box 13 \ 3  03-page256
Performance characteristics of a silencer for a carburetter.31th Oct 1930Box 13 \ 3  03-page257
Alterations and tests on starting carburetters with fixed maximum restriction.21th Nov 1930Box 13 \ 3  03-page258
Avoidance of a new design in favour of modifying the existing starter carburetter.21th Nov 1930Box 13 \ 3  03-page259
Update on the testing of Phantom II Twin Carburetters.8th Dec 1930Box 13 \ 3  03-page260
Thermostat settings, carburation issues, and silencer design for the 25HP and 45HP models.11th Dec 1930Box 13 \ 3  03-page261
Note regarding a delay in testing twin carburetters for the Phantom II.12th Dec 1930Box 13 \ 3  03-page262
Request to supply spare slow running jets for a Phantom Twin Carburetter for experimental work.16th Dec 1930Box 13 \ 3  03-page263
Urgent request for a new scheme for a reserve tank on a 40/50 HP chassis due to a new petrol pump and twin carburetter combination.19th Dec 1930Box 13 \ 3  03-page264
Issue of noise from twin carburetters and proposing a solution using the crankcase as a silencer.20th Dec 1930Box 13 \ 3  03-page265
The preliminary tests of a new twin-choke carburettor for the Phantom II.24th Dec 1930Box 13 \ 3  03-page266
Advantages of drawing air through the crankcase and the use of a honeycomb flame damper.24th Dec 1930Box 13 \ 3  03-page267
Twin type carburettor design, including intake from the crankchamber, draining, and air metering.26th Dec 1930Box 13 \ 3  03-page268
Instruction to produce a new carburetter valve seating for the Phantom 11 to prolong its life and prevent flooding.27th Jan 1931Box 13 \ 3  03-page269
Tests and corrections made on Phantom II twin choke carburettors.23th Jan 1931Box 13 \ 3  03-page270
Progress report on the development and testing of an aero-based downdraught carburetter scheme.27th Jan 1931Box 13 \ 3  03-page271
Modifications to the Phantom 11 twin choke carburetter.27th Feb 1931Box 13 \ 3  03-page272
Performance comparison graph of twin carburettors versus a standard carburettor system.22th Jan 1931Box 13 \ 3  03-page273
Single versus double carburetter configurations for 6-cylinder engines and their potential effects on performance.2nd Mar 1931Box 13 \ 3  03-page274
Tests of a downdraught carburettor on a Phantom II, detailing issues with distribution.26th Feb 1931Box 13 \ 3  03-page275
Comparing downdraught and SU carburettors, focusing on distribution and proposing tests for induction heating.26th Feb 1931Box 13 \ 3  03-page276
Performance graph comparing Downdraught and Standard carburettors on a Phantom II engine with a 5/1 compression ratio head and open exhaust.26th Feb 1931Box 13 \ 3  03-page277
List of modifications for the Phantom twin-choke carburetter.26th Feb 1931Box 13 \ 3  03-page278
List of modifications and settings for carburetter components.20th Dec 1972Box 13 \ 3  03-page279
Blueprint showing a cross-section of a valve seating component.20th Dec 1972Box 13 \ 3  03-page280
Blueprint detailing a modification to a sleeve for a variable valve on a twin choke carburettor.26th Feb 1931Box 13 \ 3  03-page281
Blueprint for a modification to a diffuser body for a Twin Choke Carburettor PII.4th Feb 1920Box 13 \ 3  03-page282
Blueprint showing modifications to a pedestal, including two views and some dimensions.4th Feb 1920Box 13 \ 3  03-page283
Blueprint detailing a modification to a diffuser outer tube.4th Feb 1920Box 13 \ 3  03-page284
Control scheme for an accelerator pump connection with the throttle spindle for twin carburettors.2nd Apr 1921Box 13 \ 3  03-page285
Blueprint drawing of a slow running plug (F.1.).2nd Apr 1921Box 13 \ 3  03-page286
Schematic diagram for a slow running system of a twin-choke carburetor, detailing an adjusting screw.6th Apr 1936Box 13 \ 3  03-page287
Blueprint for a machined part with drilling, reaming, spotfacing, and tapping instructions.3rd Jan 1928Box 13 \ 3  03-page288
Blueprint showing a cross-section and dimensions for a Tappet Spindle (Twin Series B).3rd Jan 1928Box 13 \ 3  03-page289
Blueprint showing a modification to a sleeve for a slow running jet.25th Feb 1930Box 13 \ 3  03-page290
Cross-section diagram showing the modification of passage sizes from a float-chamber to variable valves.28th Jul 1934Box 13 \ 3  03-page291
Drawing of an atmospheric release to float chambers and petrol feed to an accelerating pump well.28th Jul 1934Box 13 \ 3  03-page292
Drawing of a modified carburetter throttle for a PII model.15th Jan 1931Box 13 \ 3  03-page293
Blueprint of a carburetter choke.15th Mar 1931Box 13 \ 3  03-page294
Experimental modifications to the Phantom downdraught carburetter.5th Mar 1931Box 13 \ 3  03-page295
Request to supply restrictor jets and jet needles for Phantom carburetters.10th Mar 1931Box 13 \ 3  03-page296
Specification table detailing the dimensions for jet needles for a downdraught carburetter.13th Mar 1931Box 13 \ 3  03-page297
The performance issues of a twin carburetter under various driving conditions.13th Mar 1931Box 13 \ 3  03-page298
Inadequate carburetter silencer, requesting new versions V.1083 and V.1082 be made for car 27-EX.17th Mar 1931Box 13 \ 3  03-page299
Request to manufacture diffuser parts for Phantom Twin carburettors.20th Mar 1931Box 13 \ 3  03-page300
Proposal for an improved induction pipe for the P. 2 down draught carburetter to improve fuel distribution.2nd Apr 1931Box 13 \ 3  03-page301
Experiments to improve fuel distribution with a downdraught carburetter.2nd Apr 1931Box 13 \ 3  03-page302
Road tests of a Phantom II twin-choke carburettor.2nd Apr 1931Box 13 \ 3  03-page303
Carburettor metering, fuel starvation during turns, and performance test results.2nd Apr 1931Box 13 \ 3  03-page304
Progress report on carburettor testing and development, covering noise, performance, and fuel consumption.2nd Apr 1931Box 13 \ 3  03-page305
Development of double carburetters, addressing issues of uneven flow, slow filling, and cornering.9th Apr 1931Box 13 \ 3  03-page306
Investigation into carburetter flooding and fuel starvation issues on the Phantom II during sharp turns.17th Apr 1931Box 13 \ 3  03-page307
Carburetor float issues during turns in the R. engine and Phantom II.17th Apr 1931Box 13 \ 3  03-page308
Diagram illustrating a float chamber issue in a Phantom II Twin Choke Carburetter at a 14-degree inclination.17th Apr 1931Box 13 \ 3  03-page309
The petrol level performance of a P.2 twin choke carburetter, comparing present and modified designs.21th Apr 1931Box 13 \ 3  03-page310
Fuel supply of low and high-speed jets and the design of the float chamber lid joint.21th Apr 1931Box 13 \ 3  03-page311
Alterations to the P.2. carburetter to prevent cutting out and advocating for the in-house development of double carburetters.4th May 1931Box 13 \ 3  03-page312
Adjustments and a proposed final design for P. 2. twin carburetters.1st May 1931Box 13 \ 3  03-page313
Drawings for a modified twin carburetter and hot spot piping.2nd May 1931Box 13 \ 3  03-page314
The slow running scheme and modifications for twin choke carburettors.5th May 1931Box 13 \ 3  03-page315


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