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
Valve spring failure during testing on a Bentley unit.22th Feb 1937Box 158 \ 4  scan0123
Correspondence with The Tempered Spring Co. regarding the receipt and outstanding order of springs.22th Feb 1937Box 158 \ 4  scan0124
Official order to be placed with the Tempered Spring Co.22th Feb 1937Box 158 \ 4  scan0125
Letter from the Experimental Department to H.S. Burn Esq. regarding the 'Cross Rotary Valve'.23th Feb 1937Box 158 \ 4  scan0126
Letter from The Imperial Tobacco Company regarding arranging an interview to discuss the Cross Rotary Valve Gear.24th Feb 1937Box 158 \ 4  scan0127
Micro-examination report on a Bentley valve spring, concluding a mechanical failure rather than a material fault.26th Feb 1937Box 158 \ 4  scan0128
Clarifying the facts regarding the testing and performance of different types and materials of valve springs.4th May 1937Box 158 \ 4  scan0129
Reliability and failures of different steel wires used for springs.4th Mar 1937Box 158 \ 4  scan0130
Experiments and testing of new valve springs made from 'Swedish wire' versus standard springs.5th Mar 1937Box 158 \ 4  scan0131
The testing and comparison of different engine springs made from Swedish wire and Chrome-vanadium.5th Mar 1937Box 158 \ 4  scan0132
Letter from The Imperial Tobacco Company arranging a meeting with Mr. G. H. Grylls.5th Mar 1937Box 158 \ 4  scan0133
Letter from The Imperial Tobacco Company to G.H. Grylls arranging a meeting in Derby.11th Mar 1937Box 158 \ 4  scan0134
Letter to The Imperial Tobacco Co. Ltd. enclosing an arrangement drawing for a 25 HP unit and discussing rotary valve adaptation.19th Mar 1937Box 158 \ 4  scan0135
Letter from The Imperial Tobacco Company regarding a drawing for a 25 HP unit.22th Mar 1937Box 158 \ 4  scan0136
Request for the examination of two failed valve springs, one from a Bentley and one from a Phantom III.25th Mar 1937Box 158 \ 4  scan0137
Letter concerning an adaptation of a rotary valve design.30th Mar 1937Box 158 \ 4  scan0138
Micro-examination report on a failed Phantom III valve spring and a satisfactory Bentley valve spring.1st Apr 1937Box 158 \ 4  scan0139
The despatch of two springs to The Tempered Spring Co. for examination.27th May 1937Box 158 \ 4  scan0140
Letter to The Tempered Spring Co. regarding the failure of Rm.260 springs during testing and their return for analysis.27th May 1937Box 158 \ 4  scan0141
Letter from R.C. Cross regarding a rotary valve design for a 25 HP unit.28th May 1937Box 158 \ 4  scan0142
Concluding page of a letter regarding the efficiency and performance of a specific design.28th May 1937Box 158 \ 4  scan0143
Design proposal for adapting a cross rotary valve system to a 25 HP engine.28th May 1937Box 158 \ 4  scan0144
Design document for a cross rotary valve for a 25 HP engine.3rd Jun 1937Box 158 \ 4  scan0145
Letter to The Tempered Spring Co. Ltd. regarding failures of RM.260 valve springs and requesting their findings.3rd Jun 1937Box 158 \ 4  scan0146
Describing a valve lift indicator for testing Bentley and Phantom III engines.5th Jun 1937Box 158 \ 4  scan0147
Required parts and drawings for proceeding with a test on a Bentley engine.5th Jun 1937Box 158 \ 4  scan0148
Letter to The Tempered Spring Co. regarding failed springs and a new order for Rm.260 springs.8th Jun 1937Box 158 \ 4  scan0149
Official covering order for valve springs.8th Jun 1937Box 158 \ 4  scan0150
Instruction to manufacture valve springs using recently purchased wire from Sweden.10th Jun 1937Box 158 \ 4  scan0151
The failure of rocker shafts on Bentley and Phantom III models, concluding it is due to improperly tightened nuts.11th Jun 1937Box 158 \ 4  scan0152
Response letter to Mr. R.C. Cross regarding the claims for his Rotary Valve design.14th Jun 1937Box 158 \ 4  scan0153
Blueprint detailing the adaptation of a 'Cross' rotary valve and drive arrangement for a 3.5 litre, six-cylinder engine.24th May 1937Box 158 \ 4  scan0154
Adaptation of a cross rotary valve to a 3.5 litre, six-cylinder engine.24th May 1937Box 158 \ 4  scan0155
Specification sheet detailing valve timings for various camshafts.14th Jun 1937Box 158 \ 4  scan0156
Letter from R.C. Cross regarding tests on an experimental engine using an adapted Austin Eighteen car.18th Jun 1937Box 158 \ 4  scan0157
Page 2 of a letter to W. A. Robotham regarding demonstrating results with an Austin Eighteen car.18th Jun 1937Box 158 \ 4  scan0158
Request for a resumé of the general progress on valve springs.18th Jun 1937Box 158 \ 4  scan0159
Letter from ironfounders C. & B. Smith Ltd regarding the production of 24 experimental chilled face tappet castings.21th Jun 1937Box 158 \ 4  scan0160
Letter to The Tempered Spring Co. requesting information on the failure of two springs.1st Jul 1937Box 158 \ 4  scan0161
Experiments and findings regarding valve spring reliability and suppliers.2nd Jul 1937Box 158 \ 4  scan0162
Trial of spring rings to prevent valve over-oiling, which proved less effective than the standard grummet.2nd Jul 1937Box 158 \ 4  scan0163
Letter of recommendation from Vauxhall Motors for Mr. Stenhouse, a specialist in springs.7th Jul 1937Box 158 \ 4  scan0164
Letter to Mr. A.C. Stenhouse inviting him for a discussion on valve springs.8th Jul 1937Box 158 \ 4  scan0165
Letter from the Experimental Department chasing a delayed delivery of experimental tappets.9th Jul 1937Box 158 \ 4  scan0166
Letter to Messrs C. & B. Smith Ltd. acknowledging receipt of tappet blanks and advising an official order will be placed.12th Jul 1937Box 158 \ 4  scan0167
The despatch of two Bentley inlet valves to A. Duckham Ltd.5th Aug 1937Box 158 \ 4  scan0168
Letter from Alexander Duckham & Co. Ltd. thanking for the return of two loaned Bentley Inlet Valves.9th Aug 1937Box 158 \ 4  scan0169
Micro-examination report on two broken valve springs from chassis No. 3BT.179.11th Aug 1937Box 158 \ 4  scan0170
Laboratory report cover featuring a photograph of two fractured metal rings.11th Aug 1937Box 158 \ 4  scan0171
Letter providing guidance on the process of Stelliting valves.20th Sep 1937Box 158 \ 4  scan0172
Instructions for applying Stellite to valve steel using an acetylene torch.20th Sep 1937Box 158 \ 4  scan0173
Page 3 of a letter detailing the Stelliting process for valves, including a sketch and cooling instructions.21th Sep 1937Box 158 \ 4  scan0174
Letter to E.R.A. Ltd. concerning the examination of failed valves and the reasons for their failure.21th Sep 1937Box 158 \ 4  scan0175
Letter discussing defects discovered in engine valves after etching, related to the Stellite application process.21th Sep 1937Box 158 \ 4  scan0176
Requesting the dispatch of 5 valves back to Mr. P. Berthon of E.R.A. Ltd for inspection.21th Sep 1937Box 158 \ 4  scan0177
Letter from English Racing Automobiles regarding issues with stelliting valves and a request for inspection and further observations.21th Sep 1937Box 158 \ 4  scan0178
Letter from English Racing Automobiles Ltd. regarding the failure of exhaust valves and requesting stelliting services.23th Sep 1937Box 158 \ 4  scan0179
Continuation letter from English Racing Automobiles Ltd. regarding the final machining of fabricated parts.23th Sep 1937Box 158 \ 4  scan0180
Letter from English Racing Automobiles Ltd discussing valve stelliting troubles and requesting assistance.23th Sep 1937Box 158 \ 4  scan0181
Letter declining a request for Stelliting valves and recommending Motor Components Ltd. of Birmingham for the work.28th Sep 1937Box 158 \ 4  scan0182
Letter from English Racing Automobiles Ltd. thanking for correspondence and confirming they are contacting Motor Components, Ltd. as suggested.1st Oct 1937Box 158 \ 4  scan0183
Requesting the dispatch of 3 valves to F.R. Banks of Ethyl Export Corporation for trial.13th Oct 1937Box 158 \ 4  scan0184
Letter detailing the trial results and condition of three exhaust valves submitted for testing.13th Oct 1937Box 158 \ 4  scan0185
Letter discussing cracked Sil.XCR valves and seeking feedback on the manufacturing issue.28th Oct 1937Box 158 \ 4  scan0186
Letter to The Midland Cylinder Co. requesting a quote for a trial batch of tappet casting blanks using a new material called Monichrome.28th Oct 1937Box 158 \ 4  scan0187
Requesting a report on valves held open by the hydraulic mechanism in a cold chamber, questioning if the cause was Price's oil or sludge.28th Oct 1937Box 158 \ 4  scan0188
Serious situation and potential causes for the failure of hydraulic tappets.29th Oct 1937Box 158 \ 4  scan0189
Plunger clearance, oil leakage, and sludge issues in tappet and valve mechanisms.29th Oct 1937Box 158 \ 4  scan0190
List of experimental cars showing mileage covered during hydraulic tappet tests.29th Oct 1937Box 158 \ 4  scan0191
Letter from a supplier advising against the use of their 'Monikrom' alloy for tappets due to unsuitability.30th Oct 1937Box 158 \ 4  scan0192
The mileage completed by various units on a solid rocker mechanism.2nd Nov 1937Box 158 \ 4  scan0193
Procedure for deleting silent hydraulic tappets following a successful 15,000-mile test.11th Nov 1937Box 158 \ 4  scan0194
The trial results of non-stellited Thompson-Products exhaust valves and requesting further information.2nd Dec 1937Box 158 \ 4  scan0195
Series of questions regarding the sourcing, pricing, and advantages of American Silichrome valve materials.2nd Dec 1937Box 158 \ 4  scan0196
Letter from Belgrave Engineering Co offering to manufacture Push Rods and enclosing a sample valve, referencing their previous work for Ford.3rd Dec 1937Box 158 \ 4  scan0197
Confirming a trial to incorporate valve spring dampers and delete bottom spring washers.7th Dec 1937Box 158 \ 4  scan0198
Letter to Belgrave Engineering Co. regarding a sample valve, its quality, and a request for quotation for production.15th Dec 1937Box 158 \ 4  scan0199
Addition of tappet retaining plates for Wraith III and Bentley 111 engines.16th Dec 1937Box 158 \ 4  scan0200
Request to manufacture petrol drain valves for the Phantom III and 30 HP models.31th Dec 1937Box 158 \ 4  scan0201
Quotation for chassis valve forgings from Belgrave Eng. Co. and requesting a cost analysis.10th Jan 1938Box 158 \ 4  scan0202
Request for the production of two sets of valve springs, one normally produced and one shot blasted, for a special long distance test.10th Jan 1938Box 158 \ 4  scan0203
Analysis of a sample 'die cast' cast iron tappett from the Ford Motor Company, comparing its material composition and hardness to tappetts produced for the Wraith.14th Jan 1938Box 158 \ 4  scan0204
Letter to The Belgrave Engineering Co. regarding the production and costing of valves and push rods.24th Jan 1938Box 158 \ 4  scan0205
Letter to The Tempered Spring Co. requesting the supply of springs for an experimental trial.31th Jan 1938Box 158 \ 4  scan0206
Testing, adoption, and trials of different valve springs for various car models.31th Jan 1938Box 158 \ 4  scan0207
Comparative cost analysis for different types of springs.31th Jan 1938Box 158 \ 4  scan0208
Letter to The Tempered Spring Co. regarding the specifications and potential design improvements for two spring types.1st Feb 1938Box 158 \ 4  scan0209
Letter specifying diameter limits for valve spring washers and requesting urgent delivery of springs.1st Feb 1938Box 158 \ 4  scan0210
Letter to The Tempered Spring Co. enquiring about the delivery of an order for valve springs.11th Feb 1938Box 158 \ 4  scan0211
Technical report providing an analysis and comparison of three American Silcrome valve steels.12th Feb 1938Box 158 \ 4  scan0212
Report comparing American valve steels like Silcrome, including prices, equivalents, and adoption by various car manufacturers.12th Feb 1938Box 158 \ 4  scan0213
The difficulties of stelliting Silcrome steel and issues with valve steel.12th Feb 1938Box 158 \ 4  scan0214
Suggesting an increase in screw diameter from 5.BA to 3.BA for the rocker shaft location screw on Wraith, Bentley & 30 HP models.23th Feb 1938Box 158 \ 4  scan0215
Locking the 5.BA. location screw in the rocker shaft for 25/30 and Bentley models.25th Feb 1938Box 158 \ 4  scan0216
Complaint about broken Chrome Vanadium valve springs and suggesting a trial of carbon valve springs with anti-surge coiling.4th Mar 1938Box 158 \ 4  scan0217
Valve spring failure due to corrosion on Chassis GUN-37.9th Mar 1938Box 158 \ 4  scan0218
Letter to a supplier regarding difficulty machining inlet valves and asking for heat treatment advice.16th Mar 1938Box 158 \ 4  scan0219
Revised oil pipe design for the Wraith III and Bentley 111 relief valves to improve access.18th Mar 1938Box 158 \ 4  scan0220
Letter to The British Tyre & Rubber Co. requesting a supply of twelve 'Neuprene' bushes with specific dimensions and hardness.6th Apr 1938Box 158 \ 4  scan0221
Request to manufacture six rocker cover thumb nuts from a cheaper material for testing and cost-saving purposes.6th Apr 1938Box 158 \ 4  scan0222


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