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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The limitations of the Autovac vacuum fuel feed system and tests using a pressure feed pump as an alternative.12th Dec 1925Box 40 \ 4  Scan157
Tests using a small vacuum pump to improve petrol supply efficiency.3rd Dec 1925Box 40 \ 4  Scan158
Test results table for Autovac supply and induction pipe depression on a 40/50 Silver Ghost at full throttle.9th May 1925Box 40 \ 4  Scan159
Table of results for Autovac tests on a 40/50 Silver Ghost, measuring supply rates against engine demand at various fuel levels.1st Dec 1925Box 40 \ 4  Scan160
Sketch of an Autovac Galometer and the delivery of tools.1st Dec 1925Box 40 \ 4  Scan161
The principle of action for the Autovac Galometer.9th Dec 1925Box 40 \ 4  Scan162
The workings of an Autovac petrol measurement instrument and its float chamber.21th Dec 1925Box 40 \ 4  Scan163
Describing the operation of a float chamber and reservoir system for a petrol supply.9th Dec 1925Box 40 \ 4  Scan164
The performance, error margins, and potential application of a Measuring Autovac and Galometer fuel system.9th Dec 1925Box 40 \ 4  Scan165
Comparing the specifications of a 'Measuring Autovac' with a 'Standard Autovac'.12th Jun 1925Box 40 \ 4  Scan166
Lead time and standardization of an improved elbow and modified suction valve for the Autovac system.31th Dec 1925Box 40 \ 4  Scan167
Cover letter forwarding a communication from R.R. Inc. concerning the Autovac for internal review and comments.5th Jan 1926Box 40 \ 4  Scan168
Experiment to compare a sample against an Autovac.7th Jan 1926Box 40 \ 4  Scan169
Attached document about the 'AUTOVAC'.4th Jan 1926Box 40 \ 4  Scan170
Letter suggesting using Stewart tank parts to resolve a misfiring issue with the Autovac system.22th Dec 1925Box 40 \ 4  Scan171
Comparing the performance of Stewart, Autovac, and Kingston fuel systems, detailing issues with misfiring.22th Dec 1925Box 40 \ 4  Scan172
Use of special oil pumps and vacuum systems, with reference to Cadillac and Stewart systems.22th Dec 1925Box 40 \ 4  Scan173
Recommending the standardisation of an improved bye-pass valve to resolve an ongoing fault with Autovac and slow running.1st Mar 1926Box 40 \ 4  Scan174
Ordering special elbows with a restricted valve to deal with complaints regarding the Autovac and faulty slow running.3rd Mar 1926Box 40 \ 4  Scan175
Standardisation of a special valve for the Autovac, intended to reduce negative effects on slow running.22th Apr 1926Box 40 \ 4  Scan176
The 40/50 HP Autovac, attaching a report for comment.21th Jun 1926Box 40 \ 4  Scan177
Instruction to use a soft aluminium washer on the 20 HP Autovac drain plug and induction pipe connection.20th Aug 1926Box 40 \ 4  Scan178
Petrol being sucked into the engine through the autovac pipe due to a piece of solder.8th Aug 1926Box 40 \ 4  Scan179
Test report on the 'IMCO' Autopulse fuel pump fitted to chassis 9-EX, comparing its performance and fuel level stability against the Autovac system.13th Sep 1926Box 40 \ 4  Scan180
The performance issues of the Autopulse unit, detailing its irregular petrol delivery and excessive noise.20th Sep 1926Box 40 \ 4  Scan181
Testing a modified piston valve for the Autovac petrol feed system to improve slow running.20th Sep 1926Box 40 \ 4  Scan182
Benefits of a parallel spindle over a tapered spindle in the Autovac system.13th Oct 1926Box 40 \ 4  Scan183
Issue with the plunger of the Autovac Restriction Elbow sticking due to a fine taper.13th Oct 1926Box 40 \ 4  Scan184
Sticking piston issue with the Autovac Restriction Elbow, contrasting a supplier's part with an in-house version.14th Oct 1926Box 40 \ 4  Scan185
Sample part from Autovac Co. and a proposed modification to a piston spindle.16th Oct 1926Box 40 \ 4  Scan186
Proposal to test a new aluminium head on a vacuum tank.16th Nov 1926Box 40 \ 4  Scan187
Cover note for a report detailing objections to the Autopulse Fuel Pump.22th Nov 1926Box 40 \ 4  Scan188
Action of the self-draining float in the Autovac petrol feed system.22th Dec 1926Box 40 \ 4  Scan189
Description of the action and design of a self-draining float for an Autovac petrol feed system.22th Dec 1926Box 40 \ 4  Scan190
The functionality and limitations of a self-draining float in an Autovac, including a diagram.30th Dec 1926Box 40 \ 4  Scan191
The potential causes for the Autovac petrol feed float overfilling and failing.30th Dec 1926Box 40 \ 4  Scan192
Query regarding a normal float and the potential effect of adding a restriction to its hollow stem.30th Dec 1926Box 40 \ 4  Scan193
Letter to Autovac Mfg. Co. Ltd. concerning significant variations in petrol delivery performance between different Autovac units.7th Jan 1927Box 40 \ 4  Scan194
Continued letter seeking information on the most efficient length of engine stroke.11th Jan 1927Box 40 \ 4  Scan195
Letter from Autovac Manufacturing Co. Ltd. acknowledging a previous correspondence and promising a follow-up after tests.11th Jan 1927Box 40 \ 4  Scan196
Letter to The Autovac Mfg. Co. Ltd. about persistent variation issues and a request for an expert to visit Derby.14th Jan 1927Box 40 \ 4  Scan197
Letter from The Autovac Manufacturing Co. Ltd. confirming a visit for 10 a.m. on Thursday the 20th.17th Jan 1927Box 40 \ 4  Scan198
Letter sending the results of Autovac tests to The Autovac Mfg. Co. Ltd.20th Jan 1927Box 40 \ 4  Scan199
Cross-sectional blueprint of a mechanical coupling or flange assembly.20th Jan 1927Box 40 \ 4  Scan200
Test report on petrol delivery variation by different autovac units under various conditions.20th Jan 1927Box 40 \ 4  Scan201
Comparative test results for alterations to a new type of autovac filter.20th Jan 1927Box 40 \ 4  Scan202
Autovac tests measuring the effect of restriction in the petrol line on petrol delivery under various conditions.20th Jan 1927Box 40 \ 4  Scan203
Autovac and dynamometer test results comparing different petrol filters.20th Jan 1927Box 40 \ 4  Scan204
Test report comparing the performance of original and modified autovac filters.21th Jan 1927Box 40 \ 4  Scan205
Letter from The Autovac Manufacturing Co. Ltd. acknowledging a report on Autovac tests and promising trial results.21th Jan 1927Box 40 \ 4  Scan206
Letter from Autovac Manufacturing Co. Ltd. discussing experiments on two fuel suction apparatus and a strainer.26th Jan 1927Box 40 \ 4  Scan207
Letter from The AutoVac Manufacturing Co. Ltd. detailing the results of experiments on petrol delivery systems.26th Jan 1927Box 40 \ 4  Scan208
Diagram illustrating the operation of an Autovac moving float mechanism.2nd Feb 1927Box 40 \ 4  Scan209
Cover page with a 'Print Room' stamp from Derby.2nd Feb 1927Box 40 \ 4  Scan210
Two types of Autovac petrol feed units received for testing to improve supply on the Phantom engine.2nd Feb 1927Box 40 \ 4  Scan211
Comparison of Measuring and Moving Float type Autovac fuel systems and their performance under different conditions.2nd Feb 1927Box 40 \ 4  Scan212
Report comparing the performance of different Autovac fuel system units and configurations.2nd Feb 1927Box 40 \ 4  Scan213
Analysis of an Autovac fuel system, detailing the effect of float movement on petrol delivery and cycle times.2nd Feb 1927Box 40 \ 4  Scan214
Investigation into petrol delivery variations in Autovacs, recommending a modification to the suction hole dimensions.2nd Feb 1927Box 40 \ 4  Scan215
Graph plotting Autovac petrol delivery against engine RPM in a series of comparison tests on a 20HP engine.8th Feb 1927Box 40 \ 4  Scan216
Blank page with a Print Room date stamp in the bottom right corner.8th Feb 1927Box 40 \ 4  Scan217
Graph comparing Autovac petrol delivery performance on a 20 HP engine at half throttle.2nd Feb 1927Box 40 \ 4  Scan218
Stamped by the print room in Derby.2nd Feb 1927Box 40 \ 4  Scan219
Graph showing the effect of Autovac float movement on petrol delivery against engine RPM.2nd Feb 1927Box 40 \ 4  Scan220
The reverse side of a document showing a Print Room date stamp.2nd Feb 1927Box 40 \ 4  Scan221
Letter to The Autovac Mfg. Co. detailing experiments on two of their Autovac units and suggesting future modifications.7th Feb 1927Box 40 \ 4  Scan222
Letter regarding modifications to Autovac units, the return of components for investigation, and enclosing comparative test results.16th Feb 1927Box 40 \ 4  Scan223
Occasional erratic working of the autovac due to issues with the float.16th Feb 1927Box 40 \ 4  Scan224
Sales trials for car GYK-10, detailing a fault with the autovac and subsequent carburetter adjustment.7th Feb 1927Box 40 \ 4  Scan225
Investigation into the cause of Autovac petrol feed failure, specifically testing scenarios related to a leaking float.2nd Feb 1927Box 40 \ 4  Scan226
Autovac failure analysis, specifically concerning the suction valve and float.7th Mar 1927Box 40 \ 4  Scan227
Legal dispute and patent case between Autovac and Grav-Vac.7th Mar 1927Box 40 \ 4  Scan228
Letter from Autovac Manufacturing Co. Ltd. regarding litigation over patent infringement of the Autovac apparatus.21th Dec 1925Box 40 \ 4  Scan229
Extract from a letter regarding the conclusion of litigation over a petrol feed apparatus patent.26th Feb 1927Box 40 \ 4  Scan230
Supply of Grav-Vac apparatus and detailing the legal history between the Grav-Vac and Autovac companies.9th Mar 1927Box 40 \ 4  Scan231
Report comparing the efficiency of the Grav-Vac vacuum petrol feed tank with the Autovac system.30th Mar 1927Box 40 \ 4  Scan232
Graph comparing the petrol delivery rates of Autovac and Grav-Vac fuel feed systems at different engine speeds.28th Mar 1927Box 40 \ 4  Scan233
Blank or heavily faded document with a purple stamp in the bottom right corner.30th Mar 1927Box 40 \ 4  Scan234
Unsatisfactory performance at slow speeds in cars fitted with the Autovac fuel system.7th Apr 1927Box 40 \ 4  Scan235
Known fault with the Autovac system on cars.7th Apr 1927Box 40 \ 4  Scan236
Letter from Autovac Mfg. Co. Ltd. regarding experiments on their apparatus and its effect on the fuel mixture.3rd Jul 1925Box 40 \ 4  Scan237
Requesting a report on the current opinion of the Autovac system's performance.8th Apr 1927Box 40 \ 4  Scan238
Attaching copies of two letters sent to the Autovac Co. regarding a problem.8th Apr 1927Box 40 \ 4  Scan239
Letter to the Autovac Mfg. Co. Ltd. regarding a complaint about slow speed light running issues with the 'Autovac' system.28th May 1925Box 40 \ 4  Scan240
Page 2 of a letter requesting suggestions to overcome an engine difficulty that occurs when warm.2nd Jul 1925Box 40 \ 4  Scan241
Letter to the Autovac Mfg. Co. Ltd. regarding an engine miss-fire issue caused by their system.2nd Jul 1925Box 40 \ 4  Scan242
Performance issues with the Autovac fuel system and requesting an updated opinion.1st Apr 1927Box 40 \ 4  Scan243
Complaint and subsequent alteration to the 'AUTOVAC' system.11th Apr 1927Box 40 \ 4  Scan244
Letter to The Autovac Co. regarding tests on modified suction elbows for an engine.29th Oct 1925Box 40 \ 4  Scan245
BJ to Hs concerning an Autovac and a letter to Mr. Gastall.12th Apr 1927Box 40 \ 4  Scan246
Letter regarding the ongoing unsatisfactory performance of the Autovac system and potential improvements.12th Apr 1927Box 40 \ 4  Scan247
Cover memo from BJ to Hs. enclosing correspondence with the Autovac Manufacturing Co. regarding the Autovac System.27th Apr 1927Box 40 \ 4  Scan248
Letter from Autovac Manufacturing Co. Ltd. to Rolls-Royce regarding the testing of their petrol feed system.26th Apr 1927Box 40 \ 4  Scan249
Letter to Mr. Gastall regarding improvements and defects in the Autovac System.27th Apr 1927Box 40 \ 4  Scan250
Fitting of an Autovac with a loose float to car 10-EX.27th Apr 1927Box 40 \ 4  Scan251
Carburettor starvation on the Phantom model, caused by petrol boiling in the Autovac fuel feed system.4th Jun 1927Box 40 \ 4  Scan252
Tests and solutions for petrol starvation in the autovac system due to heat from the exhaust manifold.14th Jun 1927Box 40 \ 4  Scan253
Failures of the autovac petrol feed system on Phantom cars and experiments to fix the issue using a larger pipe.14th Jun 1927Box 40 \ 4  Scan254
Test report on petrol pipe sizes for a Standard Phantom engine, recommending the adoption of a larger pipe.13th Jun 1927Box 40 \ 4  Scan255
Graph showing the effect of petrol pipe size on Autovac petrol delivery relative to engine RPM.13th Jun 1927Box 40 \ 4  Scan256


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