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                
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Spark plug failures due to overheating and carbon, and the testing of various plug types.8th May 1918Box 34 \ 2  Scan097
Ideal spark plug insulator materials and designs to resist carbon build-up.8th May 1918Box 34 \ 2  Scan098
The performance of modified ignition plugs designed for easier cleaning.14th May 1918Box 34 \ 2  Scan099
Letter to the Air Board Technical Dept. discussing the advantages of using jump spark distributors for the 'Condor' engine ignition.14th May 1918Box 34 \ 2  Scan100
Ignition plug failures from sooty deposits and the potential of a jump spark distributor.14th May 1918Box 34 \ 2  Scan101
Experiments into pre-ignition and ignition, focusing on the overheating effects of different spark plug designs.15th May 1918Box 34 \ 2  Scan102
Analysis of engine overheating causes related to ignition, spark plug gaps, plug temperature, and compression ratios.5th May 1918Box 34 \ 2  Scan103
Engine tests on pre-ignition, overheating, and detonation, noting the effect of charge temperature.15th May 1918Box 34 \ 2  Scan104
Investigation into engine pre-ignition and the effect of warming up the fuel-air charge.15th May 1918Box 34 \ 2  Scan105
Analysis of engine 'running on' after being switched off, exploring causes like spontaneous combustion and temperature.15th May 1918Box 34 \ 2  Scan106
Comparison of magneto versus battery ignition systems, noting performance differences under various conditions.15th May 1918Box 34 \ 2  Scan107
Sparking plug tests with manufacturers Lodge and K.L.G., and proposing the testing scheme to the Air Board.30th May 1918Box 34 \ 2  Scan108
Continued document discussing issues with porcelain cracking under excessive heat, particularly with special plugs from 'Lodge'.30th May 1918Box 34 \ 2  Scan109
From E.H. to C.J. dismissing a suggestion for sparking plugs as impracticable.30th May 1918Box 34 \ 2  Scan110
CJ to EH regarding a request from Mr. Thos. W. Hall.28th May 1918Box 34 \ 2  Scan111
Letter suggesting the use of a fusible alloy instead of mercury for cooling aeroplane engine spark plugs.25th May 1918Box 34 \ 2  Scan112
Letter from a draughtsman proposing a plug modification using fused metal instead of mercury.18th Jan 1919Box 34 \ 2  Scan113
Proposal to modify aero engine spark plugs with a fusible alloy plug.18th Jan 1919Box 34 \ 2  Scan114
Letter politely declining a suggestion due to being fully occupied with war work.1st Jun 1918Box 34 \ 2  Scan115
Telegram concerning the testing of new plugs designed to withstand overoiling and heat conditions.5th Jun 1917Box 34 \ 2  Scan116
Urgent need to supply a temporary type of sparking plug to customers.29th Mar 1919Box 34 \ 2  Scan117
Test results for various spark plugs under compression pressure after an engine run.29th Mar 1919Box 34 \ 2  Scan118
Issues with sparking plugs, pre-ignition and misfires on the 300 HP Eagle 'B' engine.6th Sep 1916Box 34 \ 3  Scan001
Extract concerning sourcing insulators to manufacture sparking plugs for the 'Eagle' 'B' engine.15th Sep 1916Box 34 \ 3  Scan002
24-hour test of a new sparking plug design for the 'Eagle' 'B' engine, comparing it to a Bosch model.8th Sep 1916Box 34 \ 3  Scan003
List of Bosch magnetos and spark plugs with their associated reference numbers.1st Mar 1918Box 34 \ 3  Scan004
Test results of various spark plugs under compression pressure at different magneto speeds.1st Mar 1918Box 34 \ 3  Scan005
Tests on different types of sparking plugs due to misfiring issues, concluding K.L.G. plugs are unreliable.23th Oct 1919Box 34 \ 3  Scan006
Performance of Lodge make ignition plugs with mica insulation compared to older K.L.G. and porcelain plug types.10th Sep 1920Box 34 \ 3  Scan007
Difficulty of cleaning certain spark plugs and comparing them to detachable alternatives.10th Sep 1920Box 34 \ 3  Scan008
Engine performance issues, specifically soot deposits, ignition problems at slow speeds, and potential valve clearance issues.10th Sep 1920Box 34 \ 3  Scan009
Chassis 39-TW, discussing improvements to ignition plugs and condensers.12th Nov 1920Box 34 \ 3  Scan010
Selection, ordering, and testing of various brands of sparking plugs.2nd Feb 1921Box 34 \ 3  Scan011
Proposal to reduce costs and save time by repairing Mercury plugs.1st Aug 1921Box 34 \ 3  Scan012
Performance of Champion and Mercury ignition plugs and suggesting design improvements.12th Apr 1921Box 34 \ 3  Scan013
Continued discussion on material properties, comparing ordinary steel to yellow brass.12th Apr 1921Box 34 \ 3  Scan014
Modifications to car starting equipment for 6 volts, including the winding, magnetic switch, and brass button.3rd Oct 1916Box 34 \ 3  Scan015
Post-war chassis components, focusing on the self-starter motor, ignition switch, and a detailed analysis of road wheel design, materials, and testing.3rd Oct 1916Box 34 \ 3  Scan016
Overhaul and proposed improvements for a car engine.19th Apr 1917Box 34 \ 3  Scan017
List of specifications for various vehicle components, including brake straps, gears, springs, and wheels.18th Apr 1917Box 34 \ 3  Scan018
Requirements and modifications for Car 7 C.A. concerning suspension, engine, and other components.11th May 1917Box 34 \ 3  Scan019
Car modifications covering the starter, back axle, induction pipe, and gear ratios for improved road holding and petrol economy.11th May 1917Box 34 \ 3  Scan020
Fitting of an experimental new push button starter switch to the RE 7 C.A. CAR.1st Jun 1917Box 34 \ 3  Scan021
Extract listing experimental parts for car '5 C.A.' as delivered to Mr. Royce, highlighting a new push button switch.15th Jun 1917Box 34 \ 3  Scan022
Foot-operated push-button starter switch for the post-war chassis, considering design improvements.10th Sep 1917Box 34 \ 3  Scan023
Placement of the starter and main switches for the After-the-War-Chassis-X.2nd May 1919Box 34 \ 3  Scan024
Mr. Royce's decision to change the starter push button to be foot-operated on the dashboard.2nd May 1919Box 34 \ 3  Scan025
Description of the motor starting system, including its electrical operation and gear reduction ratios.26th May 1919Box 34 \ 3  Scan026
Design change to Aluminium Die Castings for a push-button switch due to high scrap rates.30th May 1919Box 34 \ 3  Scan027
Assembly completion report for Chassis 1. E.X., listing the parts and corresponding Engineering Schedule numbers.30th Jun 1919Box 34 \ 3  Scan028
Safety feature for the electric starter to prevent operation unless the vehicle is in neutral.23th Jul 1919Box 34 \ 3  Scan029
Specification table for a push button switch showing various gap measurements and button depression values.2nd Aug 1919Box 34 \ 3  Scan030
Production faults with push button switches.20th Aug 1919Box 34 \ 3  Scan031
Table of measurements and test remarks for production push button switches.22th Aug 1919Box 34 \ 3  Scan032
Table of measurements for production push button switches, numbers 11 through 20.22th Aug 1919Box 34 \ 3  Scan033
The production testing procedures for push button switches.26th Aug 1919Box 34 \ 3  Scan034
Measurement procedures and tolerances for push-button switches.26th Aug 1919Box 34 \ 3  Scan035
Specification sheet detailing the gap and depression measurements for a push-button switch.2nd Aug 1919Box 34 \ 3  Scan036
Table of clearances for a push button switch.23th Aug 1919Box 34 \ 3  Scan037
Clarifying departmental responsibility for certifying experimental push button switches for starter gears.27th Aug 1919Box 34 \ 3  Scan038
Diagram of a push-button switch showing movement radii and a method for testing carbon gap clearance.27th Aug 1919Box 34 \ 3  Scan039
Instructions for setting and measuring the gaps on a push button switch.27th Aug 1919Box 34 \ 3  Scan040
List of new parts fitted to the 40/50 chassis, comparing them with the pre-War 40/50 HP chassis.27th Aug 1919Box 34 \ 3  Scan041
Transferring the testing of push button and main switches from the Experimental to the Electrical Production Department.4th Sep 1919Box 34 \ 3  Scan042
Notification regarding a push button switch developing an earth due to an unsuitable insulating button.11th Sep 1919Box 34 \ 3  Scan043
Push-button switch failure due to earthing, with a proposed design modification.10th Sep 1919Box 34 \ 3  Scan044
Page detailing modifications to a P.B. Switch regarding spigots, bosses, and covers.10th Sep 1919Box 34 \ 3  Scan045
Alteration of a push-button switch, including a technical sketch with dimensions.18th Sep 1919Box 34 \ 3  Scan046
The measurements and tolerances for a push-button switch.23th Sep 1919Box 34 \ 3  Scan047
Complaints with the engine starter clutch mechanism and suggestions for a remedy.28th Nov 1919Box 34 \ 3  Scan048
Issues and proposed alterations for the chassis engine starter mechanism.1st Dec 1919Box 34 \ 3  Scan049
The operation of an actuator box, push-button switch, and actuator coils.11th Dec 1919Box 34 \ 3  Scan050
Request for Mr. Brock to supply one Push Button Switch to EFC, noting it needs replacing.1st Dec 1919Box 34 \ 3  Scan051
Request for a push button switch from production for experimental testing on time lag.12th Dec 1919Box 34 \ 3  Scan052
Extract detailing modifications for a re-wiring scheme on a standard chassis.8th Dec 1919Box 34 \ 3  Scan053
Short memo to Mr. Clark regarding a borrowed push button switch.11th Dec 1919Box 34 \ 3  Scan054
Test report on the lag in action of an actuator box and switch, detailing electrical resistance, current, and load measurements.15th Dec 1919Box 34 \ 3  Scan055
Test results and specifications for an actuator box with two coils.16th Jun 1939Box 34 \ 3  Scan056
Heating test report for actuator coils with results for various timings and conditions.16th Apr 1939Box 34 \ 3  Scan057
Conclusion of actuator load tests, detailing maximum loads and current draw for different models.13th Apr 1920Box 34 \ 3  Scan058
Complaint regarding failures and insufficient clearance on the dashboard starter switch due to 'earthing'.13th Apr 1920Box 34 \ 3  Scan059
Design and potential faults of a push-button switch.15th Apr 1920Box 34 \ 3  Scan060
Fault with a push button switch causing it to short.21th Apr 1920Box 34 \ 3  Scan061
Providing instructions for the production adjustment and testing of a main switch and a push-button switch.8th May 1920Box 34 \ 3  Scan062
Failures and danger from shorting caused by the starter switch cover.29th May 1920Box 34 \ 3  Scan063
Proposed modification to insulate the arm of a push-button switch to prevent short circuits.1st Jun 1920Box 34 \ 3  Scan064
Safer insulation for the press button starter switch using a thimble.3rd Jun 1920Box 34 \ 3  Scan065
Complaint and proposed solution for insulating a press button starter switch to prevent an electrical earth.8th Jun 1920Box 34 \ 3  Scan066
Potential failure of thread in ebonite for a press button starter switch.9th Jun 1920Box 34 \ 3  Scan067
New chassis troubles for Chassis 46-LW, detailing an earthing fault and issues with the fusing system.26th Jul 1920Box 34 \ 3  Scan068
Letter from M. Olley of the American branch concerning electrical faults and recommendations.26th Jul 1920Box 34 \ 3  Scan069
Extract detailing electrical equipment troubles experienced with imported chassis.19th Aug 1920Box 34 \ 3  Scan070
Ongoing trouble with the earthing of a press button starter switch and the need for better insulation.20th Dec 1920Box 34 \ 3  Scan071
Potential improvements and standardization for 'R' series materials and components.11th Feb 1921Box 34 \ 3  Scan072
Ongoing earthing issues with chassis starter switches and proposed solutions.3rd Mar 1921Box 34 \ 3  Scan073
Making parts in Bakelite, suggesting a push button switch as an experimental piece.10th May 1921Box 34 \ 3  Scan074
Letter from Rolls-Royce of America regarding a misfiring Watford magneto due to bushing wear and a proposal for using Bakelised linen as a replacement material.13th May 1921Box 34 \ 3  Scan075
The experimental use of Bakelite mouldings for a part.31th May 1921Box 34 \ 3  Scan076
Modifications to the Goshawk 11 Klaxon switch and controls on the steering column.14th Jun 1921Box 34 \ 3  Scan077
Letter to the Managing Director suggesting improvements to electrical insulation materials to improve heat resistance and reduce costs.24th Mar 1921Box 34 \ 3  Scan078


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