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 design and testing of a self-adjusting tappet mechanism for the Phantom II engine.14th Sep 1933Box 106 \ 5  scan0100
The investigation of noisy engine tappets and attempted remedies.14th Sep 1933Box 106 \ 5  scan0101
Comparison table of silent tappet systems for Cadillac, J.III, and Phantom II engines, considering only spring loads.14th Sep 1933Box 106 \ 5  scan0102
The work done to resolve issues with the silent tappet mechanism on engine 1.J.III.14th Sep 1933Box 106 \ 5  scan0103
Engine component modifications and test results, focusing on oil feed, plungers, and springs.12th Sep 1932Box 106 \ 5  scan0104
Troubleshooting issues with oil supply to the rocker shaft, plunger housing fitment, and tappet mechanism performance.12th Sep 1932Box 106 \ 5  scan0105
Trial of eccentrics for auto-adjusting tappets with a white metalled bearing surface.18th Sep 1933Box 106 \ 5  scan0106
Modifications required for a J.3 unit's hydraulically operated tappets.20th Sep 1933Box 106 \ 5  scan0107
The examination and identified issues with a silent tappet mechanism after 2000 miles of use.23th Sep 1933Box 106 \ 5  scan0108
List of required replacement parts and design requirements for an engine, including tappets, camshaft, bearings, and an oil filter.23th Sep 1933Box 106 \ 5  scan0109
Data table showing oil flow from the relief valve to the rocker shaft and timing gears at various engine speeds.23th Sep 1933Box 106 \ 5  scan0110
Addition to a report on tests comparing the valving efficiency of Phantom and Bentley engines.25th Sep 1933Box 106 \ 5  scan0111
Analysis of engine airflow, induction port design, and combustion chamber characteristics.25th Sep 1933Box 106 \ 5  scan0112
Summary of tests comparing single versus double inlet valve cylinder heads for improved volumetric efficiency.25th Sep 1933Box 106 \ 5  scan0113
Sectional elevation and plan view of a rotating port or valve mechanism within a cylinder head.28th Sep 1933Box 106 \ 5  scan0114
Astounding results of repeated oil flow tests on rocker shafts using larger diameter piping.28th Sep 1933Box 106 \ 5  scan0115
Test results for oil flow from the relief valve to the rocker shaft under various conditions.28th Sep 1933Box 106 \ 5  scan0116
Test results and proposed changes for J.3. oil-operated tappets, including pipe diameter and filter type.29th Sep 1933Box 106 \ 5  scan0117
Forwarding a letter from Mr. Jardine regarding hydraulic tappets from Wilcox Rich Corporation.30th Oct 1933Box 106 \ 5  scan0118
Letter to Robert Jardine Esq. regarding drawings for a hydraulic tappet installation.1st Nov 1933Box 106 \ 5  scan0119
Confirming a set of drawings for the 20/25 HP car tappet installation has been sent to Mr. Jardine of the Wilcox Rich Corporation.1st Nov 1933Box 106 \ 5  scan0120
Comparison table of silent tappet specifications for various car models.29th Nov 1933Box 106 \ 5  scan0121
Request for a set of plungers for J-III silent tappets with a revised clearance and reduced diameter.11th Jan 1934Box 106 \ 5  scan0122
Request to re-metal and bore out automatic tappet eccentrics and rocker shafts to a specific clearance.22th Mar 1934Box 106 \ 5  scan0123
Silent tappet scheme, rockers for the 20/25 and Bentley models, and a 10,000-mile test.19th Apr 1934Box 106 \ 5  scan0124
Request to modify Cadillac type silent tappet plunger casings and produce another complete set.16th May 1934Box 106 \ 5  scan0125
The modification of rocker shafts and tappets for Bentley and 25 HP engines.9th Jun 1934Box 106 \ 5  scan0126
Request to fit Halford silent tappets to a 20/25 car and to create a corresponding filter.11th Jul 1934Box 106 \ 5  scan0127
Mathematical analysis of the effect of leakage in hydraulic tappets.24th Jul 1934Box 106 \ 5  scan0128
Comparison of tappet leakage effects and relative movement across different engine models.24th Jul 1934Box 106 \ 5  scan0129
Outlining conclusions on car engine valve gear, including drilled valves, manufacture, and hydraulic tappet adjustment.27th Jul 1934Box 106 \ 5  scan0130
Valve gear options, including Halford tappets and Cadillac schemes, and the number of valves per cylinder for various engine types.27th Jul 1934Box 106 \ 5  scan0131
High power head inlet valve options and deflection within the valve mechanism.27th Jul 1934Box 106 \ 5  scan0132
The inconsistency of data and reliability of figures concerning engine valve bounce.18th Jul 1934Box 106 \ 5  scan0133
Comparison table of actual and theoretical valve bouncing speeds for various engines.18th Jul 1934Box 106 \ 5  scan0134
Report page discussing valve gear bouncing speeds, push rod flexure, and theoretical data for various car engines.18th Jul 1934Box 106 \ 5  scan0135
Valve bounce speeds, tappet springs, and different types of automatic hydraulic tappets.18th Jul 1934Box 106 \ 5  scan0136
Construction of a rig to magnify and photograph valve motion to understand valve bounce.18th Jul 1934Box 106 \ 5  scan0137
Request to arrange for a replacement for a broken hydraulic rocker for 21-G-IV.3rd Aug 1934Box 106 \ 5  scan0138
Comparing Halford and Cadillac silent tappet schemes following 10,000-mile tests and making design recommendations.6th Sep 1934Box 106 \ 5  scan0139
List of modifications and considerations for engine components like valves, camshafts, and tappets.6th Sep 1934Box 106 \ 5  scan0140
Recommendations for a re-design of the relief valve and an increase in the size of the oil pump.6th Sep 1934Box 106 \ 5  scan0141
Standardisation of parts scheme to prevent valves dropping in the cylinder head.29th May 1934Box 106 \ 5  scan0142
Estimated cost for extra jigs, tools, and equipment and a proposed production start.24th Jul 1934Box 106 \ 5  scan0143
Exhaust valve seat hammering on a 25 HP engine.22th Dec 1934Box 106 \ 5  scan0144
Issues with silichrome exhaust valves on 20/25 HP models due to leaded fuels, recommending a change to KE-965 valves.17th Sep 1935Box 106 \ 5  scan0145
Requesting the preparation of stellited and silichrome exhaust valves for the Spectre and 20/25 HP engines.23th Sep 1935Box 106 \ 5  scan0146
The standardisation of exhaust valves for the 20/25 HP chassis.25th Sep 1935Box 106 \ 5  scan0147
The decision to increase valve stem diameter on large bore engines for 25-29 HP and 4 litre Bentley models.27th Sep 1935Box 106 \ 5  scan0148
Standardisation of parts report for KE-965 exhaust valves following a valve head failure.24th Oct 1935Box 106 \ 5  scan0149
Cost estimation for extra Jigs, Tools, and equipment, and cost comparison for a new part for the 'M' series chassis.10th Oct 1935Box 106 \ 5  scan0150
Valve bounce issues and solutions for the Large Bore 25.HP engine.2nd Jan 1936Box 106 \ 5  scan0151
Urgent experimental request to detail new valve wedges for the 20-25 HP engine inlet valves.15th Jan 1936Box 106 \ 5  scan0152
Modifications to the rocker shaft and arm for the 25-30 and Bentley models.6th Feb 1936Box 106 \ 5  scan0153
Authorising a production modification to the Bentley & 20/25 valve gear following successful testing.9th Apr 1936Box 106 \ 5  scan0154
Experimental tapered exhaust valve (LeC.5088) for the 25/30 HP engine.22th Apr 1936Box 106 \ 5  scan0155
Comparative performance and potential failures of different exhaust valves.25th Apr 1936Box 106 \ 5  scan0156
Issues and potential improvements for the 20/25 model, focusing on the exhaust, valves, and cooling system.25th Apr 1936Box 106 \ 5  scan0157
Test results for a torsional crankshaft and valve stretching.25th Apr 1936Box 106 \ 5  scan0158
List of proposed valve tests for a 20/25 v. Bentley engine.29th Apr 1936Box 106 \ 5  scan0159
Corrections for a valve comparison sheet and comparing different exhaust valve designs.29th Apr 1936Box 106 \ 5  scan0160
Tappet clearance adjustment data for 22-G-V Engine C-16.30th Apr 1936Box 106 \ 5  scan0161
Recommendations for tappet clearances and sparking plugs for the Large Bore 20/25 HP engine.1st May 1936Box 106 \ 5  scan0162
The decision to standardize a new exhaust valve for 25/30 units.6th May 1936Box 106 \ 5  scan0163
Recurring exhaust valve failures on the 25/30 HP engine and recommending a cylinder head alteration.31th Jul 1936Box 106 \ 5  scan0164
Preliminary valve temperature tests for the 25/30 units, comparing them to the 4¼ litre Bentley.31th Jul 1936Box 106 \ 5  scan0165
Engine head modifications to resolve overheating and pre-ignition problems.31th Jul 1936Box 106 \ 5  scan0166
Blueprint of a scrap section through an exhaust port and cylinder head.31th Jul 1936Box 106 \ 5  scan0167
Scrap section view of a cylinder head's exhaust port and valve assembly.31th Jul 1936Box 106 \ 5  scan0168
Graph comparing exhaust valve temperatures against specific consumption for different engine setups and fuel types.31th Jul 1936Box 106 \ 5  scan0169
Blueprint showing a cross-section of an exhaust component.31th Jul 1936Box 106 \ 5  scan0170
Blueprint showing a cross-section of an exhaust section.19th Aug 1936Box 106 \ 5  scan0171
Standardisation of parts document for a 25/30 HP engine concerning the overhead adjustment of tappet push rods.19th Aug 1936Box 106 \ 5  scan0172
Estimated cost for jigs, tools, and equipment, with a note about the balance being included in Bentley.13th Jul 1936Box 106 \ 5  scan0173
Report comparing exhaust valve temperatures on a standard 25/30 cylinder head versus a modified head with a lowered water jacket.12th Nov 1936Box 106 \ 5  scan0174
Graph of exhaust valve temperatures versus specific fuel consumption for two different cylinder heads.3rd Nov 1938Box 106 \ 5  scan0175
Graph plotting specific fuel consumption against BMEP for a C.15 unit at 4000 RPM, comparing a standard cylinder head with an LEC 5222 head.5th Jan 1936Box 106 \ 5  scan0176
Power curves for a C15 Unit, comparing a standard cylinder head with a Cylinder Head LBC 5222.5th Nov 1936Box 106 \ 5  scan0177
Experiments to lower exhaust valve temperatures on a cylinder head.11th Dec 1936Box 106 \ 5  scan0178
The 5.B.A. location screw coming loose in the rocker shaft of Wraith, Bentley, and 30 HP models, recommending a spring washer.31th Dec 1937Box 106 \ 5  scan0179
Cracked roller from the Marles steering system on a Wraith chassis following a frontal crash.24th Aug 1939Box 106 \ 5  scan0180
Sample springs for the anti-rattle device on a Bentley Phantom III steering column.24th Nov 1938Box 106 \ 5  scan0181
Statistics of Bentley steering control rattle in different car series.26th Jan 1939Box 106 \ 5  scan0182
Internal memorandum regarding complaints about Bentley steering control rattles.19th Jan 1939Box 106 \ 5  scan0183
Fitting of an anti-rattle device to the steering columns of five Bentley cars.20th Dec 1938Box 106 \ 5  scan0184
Proposal for an anti-rattle device for the steering column of Bentley and Phantom III models, requesting the production of sample springs for testing.23th Nov 1938Box 106 \ 5  scan0185
Developed view drawing for a cylindrical component with cutouts and tabs.20th Oct 1938Box 106 \ 5  scan0186
Steering control rattle in a Bentley caused by collapsed felt in the control tube.20th Oct 1938Box 106 \ 5  scan0187
Letter to Bentley Motors requesting a blueprint for a modification to cross steering tubes to fix steering wobble.21th Sep 1938Box 106 \ 5  scan0188
Satirically formal letter to the editor of the 'Levallois Gazette' regarding a blueprint for a Kingsbury Patent Track Rod Constant Load Adjuster.22th Sep 1938Box 106 \ 5  scan0189
Steering wobble issues and a flat battery on C. Nichols' car.31th Aug 1938Box 106 \ 5  scan0190
Letter from a customer to the Sales Director's Office concerning a persistent wheel wobble and a battery issue on a 4 1/4-litre car.29th Aug 1938Box 106 \ 5  scan0191
Blueprint detailing a modification to a cross-steering tube end for more even load distribution.1st Jun 1938Box 106 \ 5  scan0192
Drawing for a modification to the Bentley Chassis steering system.8th Jun 1938Box 106 \ 5  scan0193
Complaint of a loose Bentley steering box, and the introduction of a new bolt to fix the issue.1st Dec 1937Box 106 \ 5  scan0194
Internal memorandum regarding complaints of loose steering on Bentley frames.29th Nov 1937Box 106 \ 5  scan0195
Request for a new scheme, detailed drawings, and a test for a Bentley steering column design to take up wear using a rubber ring and felt bearing.15th Dec 1937Box 106 \ 5  scan0196
Fix for a Bentley steering column rattle.14th Dec 1937Box 106 \ 5  scan0197
Feedback on the steering performance of a Frazer-Nash Bentley in high winds.18th Nov 1936Box 106 \ 5  scan0198
Customer complaints of stiff Bentley steering.30th Oct 1930Box 106 \ 5  scan0199


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