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).
Rolls-Royce Experimental Archives                
Choose Archive


Browsing Records        Page 491 of 2367        Sort by   Box   Date   Description

Filter      from        to             identifier   [all]
DescriptionDateIdentifier
Blank document page with a purple ink 'Print Room' stamp in the bottom right corner.1st Apr 1927Box 40 \ 3  Scan066
Advising that the Grav-Vac Syndicate will be submitting a modified apparatus to overcome previously experienced difficulties.25th Apr 1927Box 40 \ 3  Scan067
Letter discussing Cadillac's adoption of a vacuum pump for their fuel feed system and a wider trend away from using intake vacuum for accessories.16th Sep 1927Box 40 \ 3  Scan068
Recommendation to add a 30 cubic inch reservoir between the vacuum pump and the vacuum tank.16th Sep 1927Box 40 \ 3  Scan069
Technical drawing of a Cadillac pressure feed pump and a valveless vacuum pump.16th Sep 1927Box 40 \ 3  Scan070
Letter to RR America Inc. concerning a report on Vacuum Feed and the use of an engine-driven vacuum pump.19th Oct 1927Box 40 \ 3  Scan071
Tests on a vacuum feed system, specifically concerning engine idling and cylinder performance.19th Oct 1927Box 40 \ 3  Scan072
Road tests analyzing engine performance issues related to idling, mixture richness, and vacuum connections.19th Oct 1927Box 40 \ 3  Scan073
Continuation page of a document condemning a permanent restriction in a piston valve due to its inefficiency in the vacuum system.8th Jun 1928Box 40 \ 3  Scan074
Westinghouse Vacuum Booster (Dewandre System) and concerns regarding its installation on cars by outside agencies.8th Jun 1928Box 40 \ 3  Scan075
Trial and function of a Stewart-Warner 'Booster' and vacuum pump for fuel feed systems.25th Jun 1928Box 40 \ 3  Scan076
The functionality and installation of a standard A.C. vacuum fuel pump.26th Jun 1928Box 40 \ 3  Scan077
Describing the construction and operation of a Grav-Vac vacuum petrol feed tank, comparing it to the Autovac.26th Jun 1928Box 40 \ 3  Scan078
Comparison of the performance and limitations between a Grav-vac and an Autovac fuel delivery system.30th Oct 1928Box 40 \ 3  Scan079
Graph comparing petrol delivery at full throttle for Autovac and Grav-vac fuel systems on a 40/50HP engine.30th Oct 1928Box 40 \ 3  Scan080
Blank document page with a red ink stamp from the Derby office.23th Jun 1928Box 40 \ 3  Scan081
Graph comparing petrol delivery for Autovac and Grav-vac systems against induction pipe depression.22th Nov 1923Box 40 \ 3  Scan082
Blank page with a red 'PRINT ROOM, DERBY' stamp.23th Jun 1928Box 40 \ 3  Scan083
Blueprint diagram showing a cutaway view of a Grav-Vac Fuel Tank with labelled components.9th Nov 1920Box 40 \ 3  Scan084
Mostly blank document page featuring a red rectangular date stamp.23th Jun 1928Box 40 \ 3  Scan085
The testing of a 'Grav-vac' vacuum petrol feed tank, detailing performance issues with its valve mechanism compared to the standard Autovac.10th Jul 1928Box 40 \ 3  Scan086
Required alterations to a valve mechanism and an offer to test corrected samples.26th Jun 1928Box 40 \ 3  Scan087
Report comparing the Grav-vac vacuum feed tank with the Autovac, detailing operational principles and faults.26th Jun 1928Box 40 \ 3  Scan088
Letter from the American branch regarding a Stewart Warner vacuum pump to replace the AC fuel pump.29th Oct 1928Box 40 \ 3  Scan089
Blueprint for a vacuum pump installation with a straight lever.17th Jul 1928Box 40 \ 3  Scan090
Technical drawing of a vacuum pump bent lever installation.18th Jul 1928Box 40 \ 3  Scan091
Letter from the American branch to Derby discussing new fuel system developments by St. Warner.11th Feb 1929Box 40 \ 3  Scan092
Letter discussing the pros and cons of various fuel pump and delivery systems.11th Feb 1929Box 40 \ 3  Scan093
Letter from Rolls Royce of America discussing developments in fuel feed systems, specifically boosters and a new vacuum tank.11th Feb 1929Box 40 \ 3  Scan094
Letter discussing fuel feed systems, including vacuum pumps and boosters.5th Feb 1929Box 40 \ 3  Scan095
Page 2 of a letter from Maurice Olley discussing vacuum levels, a booster test, and an intake manifold leak.30th Jan 1929Box 40 \ 3  Scan096
Letter regarding the performance of a vacuum booster on Chassis 123-RP and a recommendation for its standard fitment.30th Jan 1929Box 40 \ 3  Scan097
Performance characteristics graph of a Stewart-Warner vacuum tank and various boosters.26th Sep 1929Box 40 \ 3  Scan098
Complaints from the U.S.A. regarding loose wire wheel hubs and potential manufacturing solutions.13th Dec 1921Box 40 \ 3  Scan099
Choice between R.W. (Rudge-Whitworth) and Dunlop wire wheels for the Goshawk and 40/50 models.1st Jul 1922Box 40 \ 3  Scan100
Relaying a suggestion from Australia to fit thrust races to wheels to combat side strain from rutted roads.8th Sep 1922Box 40 \ 3  Scan101
Querying the comparative weights of Dunlop and Rudge-Whitworth front axle hub components for the New Phantom.9th Sep 1925Box 40 \ 3  Scan102
Proposal for reducing the width of standard wire wheels for the Phantom model by modifying artillery wheel hubs.1st Oct 1927Box 40 \ 3  Scan103
Proposed narrower wire wheels for the 20 HP chassis, including alterations to the hub design.18th Oct 1927Box 40 \ 3  Scan104
Standardisation of chassis parts, specifically for shorter and lighter wheels and hubs to improve the design.2nd May 1928Box 40 \ 3  Scan105
Standardisation form for a new chassis part, detailing fitting, testing, and cost implications.2nd Jul 1923Box 40 \ 3  Scan106
Modifying the wording of the label for Bentley wheel hubs following suggestions from the Experimental Department.6th Feb 1934Box 40 \ 3  Scan107
Instructions for the maintenance and tightening of centre-lock detachable wire wheels.4th Apr 1934Box 40 \ 3  Scan108
Request to make two adaptors for Phantom II hubs to determine the centre of gravity of complete cars.4th Apr 1934Box 40 \ 3  Scan109
Article from 'The Autocar' magazine describing the Autovac petrol feed system.5th Jul 1919Box 40 \ 4  Scan001
Page from 'The Autocar' magazine dated 1919, discussing garages, motor fuel and featuring a Talbot car.5th Jul 1919Box 40 \ 4  Scan002
Article from 'The Autocar' magazine detailing the operation of the Autovac vacuum petrol feed tank system.5th Jul 1919Box 40 \ 4  Scan003
Summary of a Government Committee report on the potential use of alcohol as a motor fuel, covering supply, production, and usage.5th Jul 1919Box 40 \ 4  Scan004
Request to obtain an Auto-Vac Petrol Feed System from Arundel & Co. for experimental purposes.23th Apr 1919Box 40 \ 4  Scan005
Advantages and potential issues of a vacuum feed system for petrol supply.24th Apr 1919Box 40 \ 4  Scan006
The improvements and drawbacks of the Auto Vac vacuum feed system compared to the pressure system.24th Apr 1919Box 40 \ 4  Scan007
Letter from Arundel & Co. offering a trial of their new patented 'Autovac' Petrol Feed system.21th Oct 1919Box 40 \ 4  Scan008
Letter to Arundal & Co. regarding an Autovac feed arrangement, declining to test a special size but requesting details on an improved scheme.3rd Nov 1919Box 40 \ 4  Scan009
Letter from Arundel & Co. offering a newly re-designed Autovac for testing purposes.5th Nov 1919Box 40 \ 4  Scan010
Letter to Arundel & Co. requesting a free-of-charge Auto-vac for testing purposes.24th Nov 1919Box 40 \ 4  Scan011
Letter from Arundel & Co. reporting a leaking float in a new Autovac unit.28th Nov 1919Box 40 \ 4  Scan012
Letter from Arundel & Co. confirming a new Autovac apparatus is ready for delivery and requesting to arrange a meeting.17th Dec 1919Box 40 \ 4  Scan013
Letter from Arundel & Co. regarding a despatched Autovac and an incorrectly sent invoice.25th Nov 1919Box 40 \ 4  Scan014
Letter from a supplier responding to a complaint about a new Autovac petrol feed system and offering to send an expert to investigate.1st Dec 1919Box 40 \ 4  Scan015
Article from 'THE AUTOCAR' detailing constructional alterations and improvements to the Autovac fuel system.5th Jun 1920Box 40 \ 4  Scan016
Page from 'The Autocar' magazine, featuring various news snippets and a photograph from the motoring world.5th Jun 1920Box 40 \ 4  Scan017
Test report on the limitations of the vacuum petrol supply system on a 40/50 chassis.22th Nov 1920Box 40 \ 4  Scan018
The limitations of a vacuum petrol supply system at full throttle.22th Nov 1920Box 40 \ 4  Scan019
'Autovac' suitable for a 'Goshawk II' chassis, in accordance with Mr. Royce's wishes.14th Jun 1921Box 40 \ 4  Scan020
From Hs. to E. listing car parts despatched to W.W.1st Jul 1921Box 40 \ 4  Scan021
Letter to the Auto-Vac Manufacturing Co. Ltd. requesting particulars of tank sizes suitable for a smaller car chassis.1st Jul 1921Box 40 \ 4  Scan022
Letter concerning a patented scheme by Monier Grandjean Minguet to improve the vacuum on the Autovac system.1st Jun 1921Box 40 \ 4  Scan023
Letter from the Autovac Manufacturing Co. Ltd. concerning the Autovac Tank and arranging a visit.2nd Jul 1921Box 40 \ 4  Scan024
Requesting to urge action on the Goshawk 11 Autovac, as per Mr. Royce's instruction.23th Jun 1921Box 40 \ 4  Scan025
Discussions with the Autovac Company regarding petrol supply systems for the Goshawk 11 and a large car.5th Jul 1921Box 40 \ 4  Scan026
Advertisement reprint from 'The Motor' magazine for the Autovac Petrol Feed System.26th Jan 1921Box 40 \ 4  Scan027
Advertisement explaining the function of the Autovac Patent Self-Draining Float.14th Jul 1921Box 40 \ 4  Scan028
Proposal to trial an Autovac fuel system on the Goshawk 11 engine.14th Jul 1921Box 40 \ 4  Scan029
Letter from Autovac Manufacturing Co. Ltd. concerning the supply of Autovacs and associated fittings.12th Jul 1921Box 40 \ 4  Scan030
Test report from Autovac Manufacturing Company comparing venturi performance with and without exhaust coupling.15th Aug 1921Box 40 \ 4  Scan031
The Goshawk II 'Autovac', attaching a letter and blueprint from the Autovac Manufacturing Company.15th Aug 1921Box 40 \ 4  Scan032
Letter from Autovac Mfg. Co. Ltd. detailing test results for Autovac and Venturi fittings for a Goshawk II engine.12th Aug 1921Box 40 \ 4  Scan033
Letter from Autovac Mnfg. Co. Limited discussing the performance of a Venturi with a Non Return Valve.22th Aug 1921Box 40 \ 4  Scan034
Letter to Autovac Mfg. Co. Ltd. requesting clarification on the specifications of received Autovac tanks and components.22th Aug 1921Box 40 \ 4  Scan035
Letter from Autovac Manufacturing Co. Ltd. responding to a query about the A.V. 31 type Autovac.25th Aug 1921Box 40 \ 4  Scan036
Autovac type AV.341 of a specific size for the 'Goshawk II'.9th Sep 1921Box 40 \ 4  Scan037
Responding to a request for an Autovac for the Goshawk 11 car, advising it is currently fitted to a car that will be brought for examination.1st Sep 1921Box 40 \ 4  Scan038
Instructing the Stores to despatch an Auto-Vac to a customer.12th Sep 1921Box 40 \ 4  Scan039
Auto-Vac Tank mechanism, recommending a tank size of at least one gallon.12th Sep 1921Box 40 \ 4  Scan040
Sectional view diagram of an 'Autovac' reserve petrol tank.5th Nov 1921Box 40 \ 4  Scan041
Extract discussing drawings for Goshawk and Swallow engine designs.5th Nov 1921Box 40 \ 4  Scan042
Evaluation of a Weymann vacuum tank from Paris as a potential replacement for the Autovac.6th Jan 1922Box 40 \ 4  Scan043
Letter from Autovac Manufacturing Co. regarding a new type of Autovac with a Vacuum Intensifier sent for testing.4th Apr 1922Box 40 \ 4  Scan044
Leaflet for the patent 'Autovac' Petrol Feed System.4th Apr 1922Box 40 \ 4  Scan045
Diagram and explanation of the Autovac petrol-feed system.4th Apr 1922Box 40 \ 4  Scan046
Promotional leaflet explaining the step-by-step operation of the Autovac Petrol Feed System.6th May 1922Box 40 \ 4  Scan047
Design modifications for the Goshawk 11 Autovac tank.6th May 1922Box 40 \ 4  Scan048
New spring design for the Autovac tank valve, including material options.30th Jun 1922Box 40 \ 4  Scan049
Installation of a larger vacuum tank for a 40/50 model by cutting through the dashboard.19th Sep 1922Box 40 \ 4  Scan050
Query regarding the flimsy design of the nipple and brass union for Autovac connections.21th Dec 1922Box 40 \ 4  Scan051
Letter requesting dynamometer curves for 40/50 cars and discussing the merits of the Autovac fuel system over a pressure feed system.31th Jan 1923Box 40 \ 4  Scan052
The adoption of the Autovac system, throttle casting heat treatment, magneto drive, and ignition switches.31th Jan 1923Box 40 \ 4  Scan053
Letter discussing a proposed separate switch to test dual ignition systems.6th Mar 1923Box 40 \ 4  Scan054
Effects of high altitude on Autovac fuel systems and engine performance.6th Mar 1923Box 40 \ 4  Scan055
Table of 3rd gear readings for Autovac tests with a 15/52 axle, showing engine RPM against MPH.18th Apr 1923Box 40 \ 4  Scan056


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙