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
Petrol gum formation tests and recommendations for preventing and clearing gum deposits.1st Feb 1939Box 103 \ 5  scan0166
Investigation into the causes and effects of petrol gumming in fuel systems and the results of corrosion tests.1st Feb 1939Box 103 \ 5  scan0167
Petrol gumming tests, including results with an additive, and advice on preventing and cleaning gum deposits with acetone.1st Feb 1939Box 103 \ 5  scan0168
Investigation into petrol gumming, its causes, and the results of corrosion tests on fuel systems.1st Feb 1939Box 103 \ 5  scan0169
Test results on petrol gumming, its effect on needle sticking, and recommendations for prevention and cleaning.1st Feb 1939Box 103 \ 5  scan0170
Investigation into petrol gumming, its causes, corrosive effects on fuel systems, and test results.1st Feb 1939Box 103 \ 5  scan0171
Returning a Bentley carburetter body and sourcing a supply of 'Coaline' for investigation.21th Dec 1938Box 103 \ 5  scan0172
Fuel deposit issues in a carburetter from different fuel types and mixtures.16th Dec 1938Box 103 \ 5  scan0173
Investigation into the gumming up of throttles on a Phantom III, caused by petrol residue.16th Dec 1938Box 103 \ 5  scan0174
Following up on a telephone conversation regarding the acquisition of cars.16th Dec 1938Box 103 \ 5  scan0175
Issues with a new composition washer in S.U. Carburetters for the 'MR' series car.8th Dec 1938Box 103 \ 5  scan0176
Service costs and a cost-sharing agreement for Zenith carburettor modifications.28th Jul 1938Box 103 \ 5  scan0177
Revised low stress throttle return spring to address complaints of throttle sticking.4th May 1938Box 103 \ 5  scan0178
From GWH to Rm discussing issues with a Bentley, specifically a sticking throttle, brake adjustments, and misfires on a 25/30 HP engine.31th Mar 1938Box 103 \ 5  scan0179
Examination and replacement of an air silencer from a Bentley chassis B.230-GA.28th Mar 1938Box 103 \ 5  scan0180
Bad starting on a 4¼-litre car belonging to a Mr. Nicholls and arranging for its examination.21th Jan 1938Box 103 \ 5  scan0181
Investigation into starting issues on 4 1/4 Litre Bentley cars owned by Mr. G. Vandervell and his father.12th Jan 1938Box 103 \ 5  scan0182
Defective starter motor and associated battery issues due to cars being parked for long periods in winter.12th Jan 1938Box 103 \ 5  scan0183
Starting issues on 4¼-litre Bentleys and the potential use of thinner oil.8th Jan 1938Box 103 \ 5  scan0184
Ongoing issue of sticking carburetter throttles in Bentley vehicles.14th Feb 1938Box 103 \ 5  scan0185
Internal request for information on the availability of parts and the status of a design change test for a damping effect.25th Nov 1937Box 103 \ 5  scan0186
New designs for Bentley throttle springs to replace stretched standard ones.14th Dec 1937Box 103 \ 5  scan0187
Revisions to the Throttle Return Spring on a Bentley Chassis, including part replacements and modifications.29th Nov 1937Box 103 \ 5  scan0188
Enquiries into the condition of Voke's air cleaners on Bentley cars and the difficulty in obtaining a dirty one.1st Feb 1937Box 103 \ 5  scan0189
Confirming a modification to fix a sticking throttle on a 4¼ Litre Bentley carburetter.28th Oct 1937Box 103 \ 5  scan0190
Modifications to the Bentley II Chassis accelerator pedal bearing to address sticking issues.1st Jun 1937Box 103 \ 5  scan0191
Cause of throttle sticking in 4¼ Litre Bentley carburetter controls.21th Oct 1937Box 103 \ 5  scan0192
Lower stressed throttle return spring for the Bentley Chassis.11th Sep 1937Box 103 \ 5  scan0193
Throttle body distortion on 4¼-litre Bentley vehicles due to non-standard spanners and washer design at the Kingsbury Depot.8th Jun 1937Box 103 \ 5  scan0194
Blueprint of two throttle flange joints for 4¼ and 3½ litre engines.22th May 1937Box 103 \ 5  scan0195
Modification to the Bentley S.U. carburetter float chamber cover to fix a flooding issue.22th May 1937Box 103 \ 5  scan0196
Petrol leaks from the float chamber lid on a Bentley 3.5-litre S.U. carburetter.11th May 1937Box 103 \ 5  scan0197
Investigation into clutch fierceness and slipping issues with Graphite Bronze facings on the 20/25 model.25th May 1939Box 103 \ 5  scan0198
Issues with fierce 25 HP graphite bronze clutches.24th May 1939Box 103 \ 5  scan0199
Test rig for Borg & Beck thrust springs on 25/30 and 4¼ Litre Bentley clutches.6th Jul 1938Box 103 \ 5  scan0200
Clutch judder, thrust poundage, and the function of anti-rattle springs.6th Jul 1938Box 103 \ 5  scan0201
New rig designed for determining the total pressure of Borg & Beck clutches.28th Jun 1938Box 103 \ 5  scan0202
Telegram requesting urgent despatch of a torque reaction damper spring and bolts by aeroplane.8th Jun 1923Box 104 \ 1  scan0001
Vibration and rattle issues in 20 HP cars, proposing a solution using rubber engine mountings.29th Dec 1927Box 104 \ 1  scan0002
Cross-section drawing of a mechanical component, likely a valve or coupling assembly.28th Dec 1926Box 104 \ 1  scan0003
Alternative rubber block engine suspension designs for the India 3 project's 20 HP engine.22th Mar 1928Box 104 \ 1  scan0004
Attached drawings for the India 3 engine suspension.22th Mar 1928Box 104 \ 1  scan0005
Request to the Dunlop Rubber Co. for two dozen rubber engine mountings for a 20 HP engine, including a dimensioned sketch.3rd Apr 1928Box 104 \ 1  scan0006
Simplification of the India 3 engine suspension by reducing the number of joints.2nd Apr 1923Box 104 \ 1  scan0007
Brief memo attaching document Lec.2552 concerning the engine suspension for 'India 3'.28th Apr 1928Box 104 \ 1  scan0008
Over-run vibration with a lighter 20 HP flywheel, with comparative notes from a Chrysler test drive.3rd May 1928Box 104 \ 1  scan0009
Sending a new aluminium turbulent head, expected to increase power and torque.20th Jun 1928Box 104 \ 1  scan0010
Replacement of incorrect rubber engine mountings with new Avon samples for testing on a Trials car, including a dimensional drawing.1st Aug 1928Box 104 \ 1  scan0011
Request to borrow the Barkerlite Trials car GAJ.23 for experimental testing of its rubber engine mountings.24th Aug 1928Box 104 \ 1  scan0012
Clarifying car chassis numbers for an experiment on rubber engine feet.27th Aug 1928Box 104 \ 1  scan0013
Requesting a specific car for further experiments on rubber engine mountings.28th Aug 1928Box 104 \ 1  scan0014
Length tolerance for engine mounting diabolo rubbers.10th Sep 1928Box 104 \ 1  scan0015
The testing of trial car GHJ-53 with new engine rubber mountings.10th Sep 1928Box 104 \ 1  scan0016
Experimental engine feet trials on car GAJ-53 and the recommendation to fit standard parts before its sale.1st Sep 1928Box 104 \ 1  scan0017
20 HP car regarding painting issues, window vibration, and the effects of rubber engine mountings.17th Sep 1928Box 104 \ 1  scan0018
Specification memo with a diagram for 20 HP rubber engine feet.27th Sep 1928Box 104 \ 1  scan0019
Instruction to the Stores to send two Rear Engine Feet from chassis GAJ-53.11th Oct 1928Box 104 \ 1  scan0020
Suggesting engine suspension settings using different rubber hardnesses to mitigate high-speed wobbles.11th Oct 1928Box 104 \ 1  scan0021
Requesting the preparation of a set of rubber engine mounting parts for a 20 HP chassis test.29th Oct 1928Box 104 \ 1  scan0022
Improvements to steering by modifying front engine mounting and axle design to address gyrostatic effects.12th Nov 1928Box 104 \ 1  scan0023
Engine dampers and crankshaft balance weights.17th Nov 1928Box 104 \ 1  scan0024
Comfortable riding, springs, shock dampers, and vibration reduction.19th Nov 1928Box 104 \ 1  scan0025
Letter to the Dunlop Rubber Co. regarding the testing and specifications of sample rubber blocks for an engine foot.4th Dec 1928Box 104 \ 1  scan0026
Letter discussing specifications, testing requirements, and ordering of various rubber components.4th Dec 1928Box 104 \ 1  scan0027
Graph comparing the load versus deflection for various engine foot rubbers.4th Dec 1928Box 104 \ 1  scan0028
Order of various engine rubbers from Dunlop.5th Dec 1928Box 104 \ 1  scan0029
The cause and effect of radiator shiver in 20 HP and 'SS' models.17th Dec 1928Box 104 \ 1  scan0030
Telegram received by telephone regarding suspension and radiator vibration issues.3rd Jan 1929Box 104 \ 1  scan0031
Telegram message suggesting testing procedures for engine dampers and links.3rd Jan 1929Box 104 \ 1  scan0032
Telegram form received by telephone with a handwritten message about a vehicle frame.4th Jan 1929Box 104 \ 1  scan0033
Letter responding to remarks on the 20 HP car, discussing front-end rigidity, damping, and undershields.4th Jan 1929Box 104 \ 1  scan0034
The 10,000-mile test of the 20 HP model at Chateauroux, noting spark plug and engine mounting issues.14th Jan 1929Box 104 \ 1  scan0035
Engine mounting designs to reduce frame vibration and axle tramping.14th Jan 1929Box 104 \ 1  scan0036
Continued memorandum discussing engine back plate design and fitting options.15th Jan 1929Box 104 \ 1  scan0037
Rating test results for 20 HP India engine foot rubbers, part F55840.15th Jan 1929Box 104 \ 1  scan0038
Rating test graph for engine foot rubbers, plotting load versus deflection.15th Jan 1929Box 104 \ 1  scan0039
Upcoming trials and modifications for the SS and 20 HP G.4 models.27th Jan 1929Box 104 \ 1  scan0040
Rating of the 20 HP engine mounting rubber.1st Jan 1929Box 104 \ 1  scan0041
Rating test results for 20 HP India engine foot rubbers, showing load vs. deflection.15th Jan 1929Box 104 \ 1  scan0042
Rating test graph showing load versus deflection for 20 HP India engine foot rubbers.15th Jan 1929Box 104 \ 1  scan0043
Outlining the programme to change a car's chassis from rigid to flexible.1st Feb 1929Box 104 \ 1  scan0044
Four-point engine mounting scheme for the India 1V model.16th Feb 1929Box 104 \ 1  scan0045
Letter from Dunlop Rubber Co. concerning the supply and testing of sample rubber buffer blocks for a 20 HP engine.20th Feb 1929Box 104 \ 1  scan0046
Telegram regarding engine fit tests, suggesting modifications to rubber mountings.25th Feb 1929Box 104 \ 1  scan0047
Engine mounting designs and vibration issues.26th Feb 1929Box 104 \ 1  scan0048
Letter to Dunlop Rubber Co. concerning the specifications for buffer blocks on a 20 HP model.28th Feb 1929Box 104 \ 1  scan0049
Letter to The Dunlop Rubber Co. concerning the required load rating for blocks.7th Mar 1929Box 104 \ 1  scan0050
Modifications to the G.4 engine crankcase for a 4-point mounting system.23th Apr 1929Box 104 \ 1  scan0051
Drawings for a temporary four-point suspension system for 17-G4.8th May 1929Box 104 \ 1  scan0052
Secret memo discussing development stages and issues with different 20HP car configurations, identified by codewords 'India', 'China', and 'Japan'.9th May 1929Box 104 \ 1  scan0053
Alterations to the exhaust system and an analysis of frame stiffness and periodicity.5th May 1929Box 104 \ 1  scan0054
Modifications to engine mountings to reduce frame jelly-ing and the resulting impact on engine vibration.5th May 1929Box 104 \ 1  scan0055
Secret memo detailing experiments for the 17-G4 engine suspension system, including the use of rubber shoes.30th May 1929Box 104 \ 1  scan0056
Quality issues of sheet rubber for engine mountings from a new supplier.20th Jun 1929Box 104 \ 1  scan0057
Secret memo regarding an experimental rear gearbox suspension isolated with rubber.13th Jul 1929Box 104 \ 1  scan0058
Experiment to try a new rubber mounting on the 20 HP model.14th Dec 1929Box 104 \ 1  scan0059
Rubber engine suspension for the 20 HP model and future improvements.16th Dec 1929Box 104 \ 1  scan0060
Design proposal for the 20 HP engine suspension system, comparing it to the 40/50 HP model.27th Dec 1929Box 104 \ 1  scan0061
Adjustments for the 20 HP model's rubber-mounted engine feet to account for engine lineability and frame width variations.4th Jan 1930Box 104 \ 1  scan0062
Order for 20 HP rear engine foot rubbers from The Avon Rubber Co.17th Jan 1930Box 104 \ 1  scan0063


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