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
Summary of tests on the lubrication of worm and nut steering using different oils.27th Aug 1927West Wittering \ Q \ 2-July1927-September1927  68
Graph showing the viscosity curves for various steering box oils.5th Jul 1927West Wittering \ Q \ 2-July1927-September1927  69
Stamped blank page from the Print Room.27th Aug 1927West Wittering \ Q \ 2-July1927-September1927  70
Performance of new Watford sleeveless magnetos compared to specifications and other firms.23th Mar 1927West Wittering \ Q \ 2-July1927-September1927  71
Selection, comparison, and testing of magnetos from various manufacturers including Watford, Bosch, and Scintilla.29th Aug 1927West Wittering \ Q \ 2-July1927-September1927  72
Fitting and operation of an EAC Sequence Starter No. 2A on chassis 14-EX.31th Aug 1927West Wittering \ Q \ 2-July1927-September1927  73
Comparing ignition contact points from Delco-Remy, Bosch, and in-house designs, including different materials.31th Aug 1927West Wittering \ Q \ 2-July1927-September1927  74
Standardisation of tungsten points over platinum and postponing the decision pending further testing.31th Aug 1927West Wittering \ Q \ 2-July1927-September1927  75
Experiments with double value ballast resistances for ignition circuits to improve the longevity of platinum points.1st Sep 1927West Wittering \ Q \ 2-July1927-September1927  76
Road test report on chassis 12-EX and 11-G3, evaluating engine misfiring at different battery voltages to standardize a double ballast resistance.1st Sep 1927West Wittering \ Q \ 2-July1927-September1927  77
Comparison of wire specifications against a standard, detailing material, gauge, length, and resistance.1st Sep 1927West Wittering \ Q \ 2-July1927-September1927  78
No. 2A scheme sequence starter, its components, and current development status.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  79
Listing further proposals and updates on items for an experimental chassis.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  80
Performance test report for the 10-EX car at Brooklands, comparing it to a standard 40/50 touring car.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  81
Performance trials, analysing engine speed, top speed, and potential modifications to overcome limitations like valve bounce.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  82
General remarks on the performance of the 10-EX car, detailing suspension, steering, and the Auto-Vac system.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  83
Performance comparison between a Sports (10-EX) and Standard Touring Phantom (46-PK) chassis.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  84
Table showing car speed test results in m.p.h. under various alterations from a standard condition.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  85
Bar chart illustrating the gain or loss in lap speed (M.P.H.) for the 10 E.X. model under various conditions.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  86
Performance graph comparing BHP to Engine RPM for a 10 HP aluminum engine with a turbulent head and long duration camshaft.6th Sep 1927West Wittering \ Q \ 2-July1927-September1927  87
Proposed improvements for the Phantom model, including a new turbulent type aluminium head.9th Sep 1927West Wittering \ Q \ 2-July1927-September1927  88
Proposed improvements and a list of new parts for testing on a new chassis.9th Sep 1927West Wittering \ Q \ 2-July1927-September1927  89
List of completed design modifications for steering, magneto, battery ignition, and instruments.7th Sep 1927West Wittering \ Q \ 2-July1927-September1927  90
New sleeveless Watford magneto machines, detailing weight reductions and design differences compared to previous models.7th Sep 1927West Wittering \ Q \ 2-July1927-September1927  91
Test report on magneto performance, detailing timing, endurance, and sparking capabilities.7th Sep 1927West Wittering \ Q \ 2-July1927-September1927  92
The performance of new machines, their silence compared to Watford and Lucas magnetos, and potential cost savings.10th Sep 1927West Wittering \ Q \ 2-July1927-September1927  93
Test results and feedback on the EW6 Sleeveless Type of Watford Magneto.10th Sep 1927West Wittering \ Q \ 2-July1927-September1927  94
Methods to prevent corrosion on an aluminium air valve for the Phantom model and comparing its performance to a brass valve.1st Sep 1927West Wittering \ Q \ 2-July1927-September1927  95
Suitable material for air valves and the unsuitability of anodic treatment for wearing surfaces.8th Sep 1927West Wittering \ Q \ 2-July1927-September1927  96
Comparing the lubricating properties of Castrol 'XL', Castrol 'R', and Amber Gear oils for a steering nut and worm.8th Sep 1927West Wittering \ Q \ 2-July1927-September1927  97
The testing and standardization of tungsten ignition contact points.9th Sep 1927West Wittering \ Q \ 2-July1927-September1927  98
The comparative testing of different ignition system contact breaker points.9th Sep 1927West Wittering \ Q \ 2-July1927-September1927  99
Unsatisfactory performance and a new offer for sleeveless Watford magnetos, including price comparisons.10th Sep 1927West Wittering \ Q \ 2-July1927-September1927  100
Price comparison of different magneto types for the 40/50 HP chassis.10th Sep 1927West Wittering \ Q \ 2-July1927-September1927  101
Performance test of tungsten ignition contact points and requesting a revised design.12th Sep 1927West Wittering \ Q \ 2-July1927-September1927  102
Report page detailing findings from experiments on ignition system scrubbing action and electrical contacts.12th Sep 1927West Wittering \ Q \ 2-July1927-September1927  103
Summary of temperature tests conducted at Brooklands on the effects of various car alterations.12th Sep 1927West Wittering \ Q \ 2-July1927-September1927  104
Comparison of the 10-EX car against a standard car, focusing on cooling, ventilation, and radiator dimensions, with concluding recommendations.12th Sep 1927West Wittering \ Q \ 2-July1927-September1927  105
Test report detailing car temperature readings at Brooklands under various conditions.13th Sep 1927West Wittering \ Q \ 2-July1927-September1927  106
Comparison and bumper test of American front road springs versus standard springs for the Phantom model.13th Sep 1927West Wittering \ Q \ 2-July1927-September1927  107
Failure analysis and comparative performance of Firths Silco Manganese and American leaf springs.13th Sep 1927West Wittering \ Q \ 2-July1927-September1927  108
Test report from Brooklands concerning a 17-tooth axle and a Claudel carburetter.13th Sep 1927West Wittering \ Q \ 2-July1927-September1927  109
Test report page detailing experiences with balloon tyres, crankcase bolt shearing, and valve gear clatter.8th Jul 1927West Wittering \ Q \ 2-July1927-September1927  110
Effects of various modifications on a car's speed, including changes to the undershield, wings, cutout, tail, and hood.8th Sep 1927West Wittering \ Q \ 2-July1927-September1927  111
Brooklands performance tests showing the effect of various car modifications on lap speed.8th Sep 1927West Wittering \ Q \ 2-July1927-September1927  112
Bar chart illustrating the gain or loss in speed resulting from various vehicle modifications during tests at Brooklands.8th Sep 1927West Wittering \ Q \ 2-July1927-September1927  113
Blank page with a 'Print Room' stamp from Derby.13th Sep 1927West Wittering \ Q \ 2-July1927-September1927  114
Experiments relating to Phantom carburetters and high induction pipe depressions.19th Sep 1927West Wittering \ Q \ 2-July1927-September1927  115
Tests and results obtained from an experimental Phantom carburetter compared to a standard model.19th Sep 1927West Wittering \ Q \ 2-July1927-September1927  116
Report analyzing carburettor performance and the effects of turbulent air flow on induction pipe depression.19th Sep 1927West Wittering \ Q \ 2-July1927-September1927  117
Summary of carburetter tests on Phantom and 20 HP models, and proposals for further testing at high speeds.13th Jul 1925West Wittering \ Q \ 2-July1927-September1927  118
Power curve graph for the Lighter Phantom engine, showing the performance increase from a low depression carburettor.13th Jul 1925West Wittering \ Q \ 2-July1927-September1927  119
Page with a 'Received' stamp from Derby.17th Sep 1927West Wittering \ Q \ 2-July1927-September1927  120
Graph showing the engine power curve increase due to using larger chokes in the carburettor.13th Apr 1927West Wittering \ Q \ 2-July1927-September1927  121
Stamped cover page from the print room.19th Sep 1927West Wittering \ Q \ 2-July1927-September1927  122
Proposal to test Hispano connecting rods on the Phantom engine to increase smoothness of operation.21th Sep 1927West Wittering \ Q \ 2-July1927-September1927  123
Modifications to increase the power output of the 20 HP engine.21th Sep 1927West Wittering \ Q \ 2-July1927-September1927  124
Comparing the performance of an experimental engine against the standard production 20 HP model.21th Sep 1927West Wittering \ Q \ 2-July1927-September1927  125
Performance graph comparing the improved power output of an experimental 20 HP engine against a standard model.21th Sep 1927West Wittering \ Q \ 2-July1927-September1927  126
Diagram of the exhaust and induction manifold arrangement and cam timing for the experimental Goshawk engine.21th Sep 1927West Wittering \ Q \ 2-July1927-September1927  127
Results of testing new Tungsten ignition contact points.27th Sep 1927West Wittering \ Q \ 2-July1927-September1927  128
Page from a report discussing experiments on coil and ballast arrangements, comparing results with Delco-Remy and Bosch.27th Sep 1927West Wittering \ Q \ 2-July1927-September1927  129
Analysis of the Lorraine Dietrich engine to inform power development experiments on the 20 HP engine.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  1
Comparative tests of larger diameter valves and different carburettors on a test bench engine.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  2
Engine power tests concerning induction pipe depression with different carburettor setups.21th Apr 1927West Wittering \ Q \ 2April1927-June1927  3
Engine power increase tests by modifying carburetters and valves.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  4
Report comparing engine performance metrics based on carburettors, valves, and compression ratios, including a comparison with a Lorraine engine.25th Apr 1927West Wittering \ Q \ 2April1927-June1927  5
Summary and conclusions from tests to increase the power of a 20 HP engine.26th Apr 1927West Wittering \ Q \ 2April1927-June1927  6
Outlining plans to test a 6/1 compression ratio on a 20 HP engine against the Lorraine engine.29th Apr 1927West Wittering \ Q \ 2April1927-June1927  7
Graph showing the 20HP power increase due to lower depression in the induction pipe for engine No. 11-GII.30th Mar 1927West Wittering \ Q \ 2April1927-June1927  8
Blank page marked with a 'Record Room' date stamp from Derby.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  9
Graph plotting the performance increase on a 20 HP engine due to fitting larger valves.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  10
Performance graph comparing BHP and BMEP for a 20 HP engine with standard versus larger valves and different carburetors.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  11
Performance graph showing 20HP engine power increase from modifications to compression, valves, and induction pipe.23th May 1927West Wittering \ Q \ 2April1927-June1927  12
Graph comparing gas velocity past standard and large valves against engine RPM for a 20 HP engine.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  13
Blueprint showing the arrangement of two Zenith carburettors on the 20 HP engine.2nd Jun 1927West Wittering \ Q \ 2April1927-June1927  14
Stamped document with two punch holes at the top.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  15
Instructions for a series of experimental tests on battery ignition components.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  16
Ignition system components, including rotors, coils, condensers, and contact breaker springs.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  17
The advantages of using a stronger spring for contact points.14th Jun 1927West Wittering \ Q \ 2April1927-June1927  18
Graph of make ratio versus speed curves for an R Standard contact breaker, tested with standard and increased rated springs at various gap settings.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  19
Mostly blank page with a 'Print Room, Derby' stamp.31th Mar 1927West Wittering \ Q \ 2April1927-June1927  20
The failure of a broken propeller shaft (E.27832) due to high stress range.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  21
Blueprint diagram illustrating the failure point of an EX. propellor shaft.6th Apr 1924West Wittering \ Q \ 2April1927-June1927  22
Reverse side of a document page with a date stamp.6th Apr 1927West Wittering \ Q \ 2April1927-June1927  23
Investigation into the causes of and solutions for noisy tappets on Phantom and 20 HP cars.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  24
Page describing oil escaping from the rocker to the tappets.11th Apr 1927West Wittering \ Q \ 2April1927-June1927  25
The failure of hydraulic shock dampers during rig tests and a proposal for their redesign.11th Apr 1927West Wittering \ Q \ 2April1927-June1927  26
Modifications and performance improvements for the 10-EX and EAC-7 experimental cars.20th Apr 1927West Wittering \ Q \ 2April1927-June1927  27
Alterations to the 10-EX experimental car, specifically regarding the body and suspension.20th Apr 1927West Wittering \ Q \ 2April1927-June1927  28
Modifications to a vehicle's suspension and steering, with a list of outstanding work.20th Apr 1927West Wittering \ Q \ 2April1927-June1927  29
Delay of chassis improvements and proposing a central lubrication scheme as a priority.21th Apr 1927West Wittering \ Q \ 2April1927-June1927  30
Request for smaller diameter wheels for the 20 HP model and the associated risk to ground clearance.1st Apr 1927West Wittering \ Q \ 2April1927-June1927  31
Letter from Dunlop Rubber Co. Ltd. discussing the trend towards smaller diameter wheels and tyres and its impact on tyre mileage.13th Apr 1927West Wittering \ Q \ 2April1927-June1927  32
Considerations for fitting low-pressure tyres to existing high-pressure tyre cars.15th Apr 1927West Wittering \ Q \ 2April1927-June1927  33
Experiments and potential solutions for crankshaft torsional vibrations on the 20 HP engine.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  34
Continued discussion on friction dampers and harmonic balancers for engines.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  35
Crankshaft vibration, dampers, and the effects of inertia on different engine models.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  36
Engine vibration, crankshaft inertia, and factors determining the master period.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  37
Report page comparing inertia and stiffness figures for two different engine models.22th Apr 1927West Wittering \ Q \ 2April1927-June1927  38
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