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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Instruction sheet recording an 'Autovac Test' with fuel consumption and distance data.19th Apr 1923Box 40 \ 4  Scan057
Road test instruction sheet to confirm test bed results for a vacuum tank petrol supply issue.2nd Jul 1923Box 40 \ 4  Scan058
Reduced performance of an autovac fuel system at an altitude of 15,000 feet.3rd May 1923Box 40 \ 4  Scan059
Continued technical explanation on the disadvantages of an autovac system for maintaining petrol supply to the engine.3rd May 1923Box 40 \ 4  Scan060
Analysis of the effects of high altitude on the Autovac petrol supply system and engine performance.4th May 1923Box 40 \ 4  Scan061
Numbered list describing factors affecting the Autovac fuel system and throttle operation.9th May 1923Box 40 \ 4  Scan062
Limitations of the vacuum feed system for the 40/50 HP chassis, particularly at high altitudes.9th May 1923Box 40 \ 4  Scan063
Vacuum versus pressure fuel feed systems, recommending the Autovac system but noting its limitations.9th May 1923Box 40 \ 4  Scan064
Table of test results for an Autovac system showing supply rates in pints per hour at full throttle under various RPM, fuel level, and gradient conditions.9th May 1923Box 40 \ 4  Scan065
Calculation sheet detailing the action of an Autovac fuel system at high altitudes.9th May 1923Box 40 \ 4  Scan066
Graph from Autovac tests showing the calculated distance possible to travel at full throttle in top gear.9th May 1923Box 40 \ 4  Scan067
Performance test results for an Autovac system, showing suction levels and travel distance against RPM.9th May 1923Box 40 \ 4  Scan068
Chart from Autovac tests showing the variation of petrol supply with height, fuel level, and vehicle gradient.1st May 1923Box 40 \ 4  Scan069
Parts from a 20 HP Autovac, specifically a Nut and Nipple that needs to be returned.1st May 1923Box 40 \ 4  Scan070
Requesting an order for a nut and nipple for the Goshawk II Autovac and Piping system.14th Jun 1923Box 40 \ 4  Scan071
From Mr. Royce requesting an experimental trial of a vacuum pump for the petrol system to potentially replace the Autovac system.30th Jun 1923Box 40 \ 4  Scan072
Mr. Royce's idea for a vacuum reservoir for the vacuum feed system on a 40/50 model.14th Jul 1923Box 40 \ 4  Scan073
The dispatch of one Autovac to the Paris Depot.10th Oct 1923Box 40 \ 4  Scan074
Despatch note for one Autovac to the French branch in Paris.6th Oct 1928Box 40 \ 4  Scan075
Malfunctioning Special Autovac System on a 40/50 chassis, requesting a valve replacement to fix restricted petrol flow.29th Jan 1924Box 40 \ 4  Scan076
Standardisation proposal for the Autovac Petrol Feed to improve its design.8th May 1924Box 40 \ 4  Scan077
Declining the testing of the 'Thecla' petrol elevator, stating a preference for their own in-house version.21th Aug 1924Box 40 \ 4  Scan078
Customer suggestion for a temporary filler cap on the Autovac fuel system for 20-HP & 40/50 HP models.10th Oct 1924Box 40 \ 4  Scan079
Suggesting the addition of a drain plug to the Autovac system for the 20-HP and 40/50 HP models.17th Oct 1924Box 40 \ 4  Scan080
Desirability of a drain plug for 'Autovac' tanks and requesting an inspection for accumulated sediment.28th Nov 1924Box 40 \ 4  Scan081
The discovery of dirt in Autovac tanks during vehicle testing and the suggested need for a washing method.27th Nov 1924Box 40 \ 4  Scan082
Issues with the starter motor and back axle on a 4-GOSHAWK-11 car.12th Aug 1924Box 40 \ 4  Scan083
Cover note regarding the Autovac Tank.10th Dec 1924Box 40 \ 4  Scan084
Proposed modifications to the Autovac tank for cleaning and emergency refilling.9th Dec 1924Box 40 \ 4  Scan085
Need for a filling plug on the autovac tank for the 20 HP model.11th Dec 1924Box 40 \ 4  Scan086
Draining, cleaning, and puncture risks of Autovac petrol tanks.22th May 1925Box 40 \ 4  Scan087
Intermittent misfiring on 'Silver Ghost' chassis related to the Autovac connection.22th May 1925Box 40 \ 4  Scan088
Admitting that the autovac connection on the induction pipe can affect slow running.27th May 1925Box 40 \ 4  Scan089
Letter to the Autovac Mfg. Co. Ltd. about a slow speed light running issue caused by the Autovac system.28th May 1925Box 40 \ 4  Scan090
Typed letter discussing an engine fault with petrol vapour in the Autovac system and requesting a solution.2nd Jun 1925Box 40 \ 4  Scan091
Letter from Autovac Manufacturing Co. Ltd acknowledging receipt of a letter regarding a complaint and experiments.2nd Jun 1925Box 40 \ 4  Scan092
Technical note on a modification to eliminate a mechanical tinkling noise from the Autovac system.13th Jun 1925Box 40 \ 4  Scan093
Modifications to a guide within a tank to ensure proper petrol flow.15th Jun 1925Box 40 \ 4  Scan094
Investigation into a mechanical noise from the Autovac, with a solution to fit a guide for the float spindle.15th Jun 1925Box 40 \ 4  Scan095
Follow-up letter to The Autovac Mfg. Co. Ltd. requesting a reply to a previous letter.15th Jun 1925Box 40 \ 4  Scan096
Order office memo regarding the dispatch of one N/P Autovac to the Autovac Mfg. Co in Stockport.15th Jun 1925Box 40 \ 4  Scan097
Letter from The Autovac Manufacturing Co. Ltd acknowledging receipt of a communication.16th Jun 1925Box 40 \ 4  Scan098
Request to forward recommendations regarding Chassis No. 41-TM for Col. C. Gerard.26th Jun 1925Box 40 \ 4  Scan099
Customer complaint regarding the Autovac Connection on the Induction Pipe.19th Jun 1925Box 40 \ 4  Scan100
Unresolved customer complaint for Chassis No. 41-TM.29th Jun 1925Box 40 \ 4  Scan101
Letter to The Autovac Mfg. Co. Ltd. about engine misfiring issues caused by the Autovac system.2nd Jul 1925Box 40 \ 4  Scan102
Letter from Autovac Manufacturing Co. Ltd. regarding experiments to improve their apparatus following feedback.3rd Jul 1925Box 40 \ 4  Scan103
Ongoing investigation into a complaint with an 'autovac' part.1st Jul 1925Box 40 \ 4  Scan104
Customer complaints of uneven slow running caused by the autovac system.1st Jul 1925Box 40 \ 4  Scan105
Autovac fuel mixture distribution issues and proposed solutions.1st Jul 1925Box 40 \ 4  Scan106
Letter from Autovac Mfg. Co. regarding experiments to overcome an issue with their apparatus enriching the fuel mixture.3rd Jul 1925Box 40 \ 4  Scan107
Covering memo from CJ to Hs regarding AUTOVAC, enclosing a copy of a memo from CWB.9th Jul 1925Box 40 \ 4  Scan108
Faults with the Autovac system and vacuum windscreen wiper, including customer complaints and potential remedies.9th Jul 1925Box 40 \ 4  Scan109
Letter from Autovac Manufacturing Co. Ltd about a new fitting to resolve engine speed variations at closed throttle.13th Jul 1925Box 40 \ 4  Scan110
Cross-sectional diagram of a non-return valve assembly.14th Jul 1925Box 40 \ 4  Scan111
Letter to The Autovac Mfg. Co. Ltd. arranging a meeting with their representative.14th Jul 1925Box 40 \ 4  Scan112
Letter from Autovac Manufacturing Co. Ltd. to arrange a representative's visit.16th Jul 1925Box 40 \ 4  Scan113
Letter to The Autovac Mfg. Co. Ltd. confirming a convenient day for their representative to visit.17th Jul 1925Box 40 \ 4  Scan114
Issues with the vacuum feed system on various models and considering alternatives.24th Jul 1925Box 40 \ 4  Scan115
Letter from Autovac Manufacturing regarding the supply of two Suction Elbow Connections.4th Aug 1925Box 40 \ 4  Scan116
Inquiring about the progress of experiments on a vacuum feed system and any recent communication from the Autovac Manufacturing Co.6th Aug 1925Box 40 \ 4  Scan117
Order be placed with Autovac Mfg. Co. Ltd. for special suction elbow connections.1st Aug 1925Box 40 \ 4  Scan118
Instructing to carry on experiments on Autovac fittings and silencer tests.1st Aug 1925Box 40 \ 4  Scan119
Faults in the pressure-fed petrol system and proposing solutions to overcome issues with the Autovac system.13th Aug 1925Box 40 \ 4  Scan120
Attached testers report on the New Phantom Vacuum Feed Tank.14th Aug 1925Box 40 \ 4  Scan121
Investigations into the effect of the vacuum feed on slow engine running.14th Aug 1925Box 40 \ 4  Scan122
Page 2, detailing tests on the Autovac fuel system by introducing pure air or exhaust gas to mitigate 'lumpy' running.12th Jun 1925Box 40 \ 4  Scan123
Modified suction elbow for an Autovac system.12th Aug 1925Box 40 \ 4  Scan124
Spring-loaded piston's effect on carburetted air and Autovac efficiency.13th Aug 1925Box 40 \ 4  Scan125
Graph comparing the performance of a modified suction elbow against a standard one based on the time taken to fill an Autovac float chamber.12th Aug 1925Box 40 \ 4  Scan126
Blank document page with a print room stamp.13th Aug 1925Box 40 \ 4  Scan127
Graph showing the effect of a modified suction elbow on depression in an Autovac, comparing it to the standard part.12th Sep 1925Box 40 \ 4  Scan128
Page marked with a red ink stamp from the print room.13th Aug 1925Box 40 \ 4  Scan129
Issues with and proposing modifications for the New Phantom vacuum feed tank.17th Aug 1925Box 40 \ 4  Scan130
Technical memorandum responding to complaints from Lord Montagu regarding steering rigidity and the Autovac system.8th Aug 1925Box 40 \ 4  Scan131
Note on the correct operational position of the ignition lever.28th Sep 1925Box 40 \ 4  Scan132
Operational issues and proposed modifications for autovac tanks, including a suggestion from Mr. Royce.28th Sep 1925Box 40 \ 4  Scan133
Autopulse system as an alternative scheme to the Autovac.30th Sep 1925Box 40 \ 4  Scan134
Testing a non-return valve for the 'Phantom' vacuum feed system to eliminate engine fading.12th Oct 1925Box 40 \ 4  Scan135
Letter to The Autovac Co. regarding tests on modified suction elbows and their potential standard fitment.29th Oct 1925Box 40 \ 4  Scan136
Report comparing the operation of Stewart and Autovac trip valves and detailing improvements made to the Autovac system.30th Oct 1925Box 40 \ 4  Scan137
Diagram and notes regarding a flap valve on the fuel inlet of an Autovac tank.3rd Nov 1925Box 40 \ 4  Scan138
Letter from Autovac Manufacturing Co. Ltd. regarding the supply of special Suction Elbows as a standard fitment.3rd Nov 1925Box 40 \ 4  Scan139
Ordering modified suction elbows for the 'New Phantom' Autovac and the requirement for a Standardisation Sheet.9th Nov 1925Box 40 \ 4  Scan140
New elbows for the Autovac system designed to reduce engine misfiring at light load.13th Nov 1925Box 40 \ 4  Scan141
The cause of 'dumping' in the Autovac system and attempted solutions.13th Nov 1925Box 40 \ 4  Scan142
Explaining why suction in the Autovac is higher than in the induction pipe, due to a non-return valve.1st Nov 1925Box 40 \ 4  Scan143
The performance of an experimental elbow for the Autovac system, noting a 50% fault reduction.14th Nov 1925Box 40 \ 4  Scan144
Experience with an experimental Elbow for the Autovac system.16th Nov 1925Box 40 \ 4  Scan145
50% improvement derived from an Autovac modification using an experimental elbow.18th Nov 1925Box 40 \ 4  Scan146
Letter from The Autovac Manufacturing Co. Ltd. about variations in their Galometer and Measuring Autovac apparatus.19th Nov 1925Box 40 \ 4  Scan147
Cablegram reporting a solution for an Autovac misfiring issue.30th Nov 1925Box 40 \ 4  Scan148
Letter to the Autovac Mfg. Co. Ltd. querying the function of a non-return valve in a new measuring Autovac system.30th Nov 1925Box 40 \ 4  Scan149
Letter discussing the operation of the Autovac fuel system, float, and suction valve mechanisms.30th Nov 1925Box 40 \ 4  Scan150
Patent infringement lawsuit between the Autovac Company and the Grav-Vac Syndicate.30th Nov 1925Box 40 \ 4  Scan151
Letter from Autovac Manufacturing Co. Ltd. explaining the function of their Galometer and Measuring Autovac.1st Dec 1925Box 40 \ 4  Scan152
The accuracy and installation of an Autovac Galometer.1st Dec 1925Box 40 \ 4  Scan153
Response from the Autovac Company concerning potential errors in their Galometer and plans for testing.2nd Dec 1925Box 40 \ 4  Scan154
Letter from The Autovac Co. regarding the functionality of their Galometer and Measuring Autovac system.1st Dec 1925Box 40 \ 4  Scan155
Testing an alternative suction Autovac system on a 5-EX Silver Ghost car.3rd Dec 1925Box 40 \ 4  Scan156


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