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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Experimental department report on Phantom II self-adjusting tappets.25th Apr 1934Box 17 \ 6  Scan200
Promising new hydraulic tappet design and its proposed road testing.25th Apr 1934Box 17 \ 6  Scan201
Improvements for direct-acting, self-adjusting tappets to prevent air locking in the oil feed.25th Apr 1934Box 17 \ 6  Scan202
Comparison of two plunger mechanism schemes (Hs.1206 & Hs.1210) and test results for self-adjusting tappets.25th Apr 1934Box 17 \ 6  Scan203
The design and testing of engine tappets, discussing noise, clearances, and performance.25th Apr 1934Box 17 \ 6  Scan204
The continuous running test of self-adjusting tappets and comparison of different plunger types.25th Apr 1934Box 17 \ 6  Scan205
Blueprint for a self-adjusting tappet for Bentley and 25HP models.24th Apr 1934Box 17 \ 6  Scan206
Schematic diagram showing three different designs for self-adjusting tappets.24th Apr 1934Box 17 \ 6  Scan207
Letter to Major F.B. Halford regarding valve mechanism modifications, enclosing a blueprint for a Phantom II valve rocker.30th Apr 1934Box 17 \ 6  Scan208
Letter from Frank B. Halford suggesting academic papers related to valve spring breakages at low temperatures.30th Apr 1934Box 17 \ 6  Scan209
Letter to Major F.B. Halford acknowledging his correspondence of 30th April.1st May 1934Box 17 \ 6  Scan210
Request to set up a valve gear rig for investigating valve bounce on a Phantom engine.4th May 1934Box 17 \ 6  Scan211
Investigating complaints of sticking valves by comparing the valve mechanisms of Phantom, 20/25 HP, and Bentley cars.16th May 1934Box 17 \ 6  Scan212
Limits of reducing the exhaust valve size without a loss of power, referencing curve Hs.1214.19th May 1934Box 17 \ 6  Scan213
Letter from Cadillac regarding the status of a '16' project, a LaSalle nose, and technical details on valve springs and cams.9th May 1934Box 17 \ 6  Scan214
Page 2 of a letter from Special Problems Engineer Maurice Olley regarding an enquiry about a Captain E. J. Waters.16th Jul 1931Box 17 \ 6  Scan215
Heat treatment specification document from Cadillac Motor Car Company for an unspecified part.16th Jul 1931Box 17 \ 6  Scan216
Heat treat specification from the Cadillac Motor Car Company, detailing physical properties, treatment processes, and general specifications for wire.16th Jul 1931Box 17 \ 6  Scan217
Chart of fatigue limits for valve spring wire, plotting final stress against initial stress.9th May 1934Box 17 \ 6  Scan218
Blank document page with a date stamp on the bottom left.9th May 1934Box 17 \ 6  Scan219
Material specification for Chrome Vanadium Steel Spring Wire.9th May 1934Box 17 \ 6  Scan220
Specification for soft Swedish steel valve spring wire.17th May 1934Box 17 \ 6  Scan221
Instructions for new exhaust valve components on a Phantom II chassis to prevent sticking.17th May 1934Box 17 \ 6  Scan222
Letter to George Salter & Co. Ltd. detailing the composition and heat treatment for two types of steel for valve springs.24th May 1934Box 17 \ 6  Scan223
Letter discussing the use of carbon steel versus chrome vanadium for springs of different sizes.24th May 1934Box 17 \ 6  Scan224
Letter from Geo. Salter & Co Ltd discussing two types of steel for valve springs.25th May 1934Box 17 \ 6  Scan225
Request for chromium plating of parts for a Valve Spring Rig, including a diagram.25th May 1934Box 17 \ 6  Scan226
Letter to Geo. Salter & Co. Ltd. regarding the disadvantages of No. 1 steel due to segregation.28th May 1934Box 17 \ 6  Scan227
Requesting an additional attachment, H.R. 87, for a Valve Spring Rig.28th May 1934Box 17 \ 6  Scan228
Request for a set of modified Phantom II Halford type self-adjusting tappets with specific modifications.29th May 1934Box 17 \ 6  Scan229
Modifications for a new set of Cadillac type automatic tappet mechanisms for Phantom II engines.29th May 1934Box 17 \ 6  Scan230
Request for the manufacture of a set of open-ended valve springs for Phantom II Unit No. 28.31th May 1934Box 17 \ 6  Scan231
Valve spring performance and requirements for use with Cadillac silent tappets.4th Jun 1934Box 17 \ 6  Scan232
Specifications for replacement taper valve springs for F.II Unit No. 28, cancelling a previous instruction.5th Jun 1934Box 17 \ 6  Scan233
Request to manufacture a set of modified inlet and exhaust valves with associated cotters and washers.9th Jun 1934Box 17 \ 6  Scan234
Valve springs for silent tappets on the Phantom model.13th Jun 1934Box 17 \ 6  Scan235
Experimental trial of Phantom valves, springs, and hydraulic silent tappets.13th Jun 1934Box 17 \ 6  Scan236
Details on using Cadillac-type automatic tappets and associated components for the Phantom II model.12th Jun 1934Box 17 \ 6  Scan237
Cadillac type automatic tappets for the Phantom II.15th Jun 1934Box 17 \ 6  Scan238
Tests on Cadillac type automatic tappets for the Phantom II to investigate high-speed valve float and power loss.15th Jun 1934Box 17 \ 6  Scan239
Summary of test results comparing different camshafts and the effects of various valve springs on engine performance.15th Jun 1934Box 17 \ 6  Scan240
Tests on camshafts and valve springs to resolve high-speed engine trouble.15th Jun 1934Box 17 \ 6  Scan241
Camshaft performance and the effect of stiffening the valve mechanism.15th Jun 1934Box 17 \ 6  Scan242
Graph comparing engine power curves for a Phantom II with an open exhaust and 5.25:1 compression ratio, testing two different camshaft and rocker setups.14th Jun 1934Box 17 \ 6  Scan243
Blank page with a Print Room stamp.18th Jun 1934Box 17 \ 6  Scan244
Graph showing the opening and closing contour of valve lift for Cadillac type tappets on a Phantom II camshaft.14th Jun 1934Box 17 \ 6  Scan245
Blank document stamped by the Print Room in Derby.18th Jun 1934Box 17 \ 6  Scan246
Letter from General Motors Corporation requesting design details for a ball type valve.11th Jun 1934Box 17 \ 6  Scan247
Letter to General Motors Corporation regarding a ball valve scheme for a silent tappet.19th Jun 1934Box 17 \ 6  Scan248
Requesting holes to be drilled in rockers for feeding oil to valve tips on automatic tappets for chassis 28-EX.20th Jun 1934Box 17 \ 6  Scan249
Standardisation of stepped exhaust valve stems.1st Jun 1934Box 17 \ 6  Scan250
Cost estimate and production note for extra jigs, tools, and equipment for the 'T' series chassis.28th May 1934Box 17 \ 6  Scan251
Requesting the preparation of stellited exhaust valves and seats for Phantom and Bentley engine tests.21th Jun 1934Box 17 \ 6  Scan252
Power curve showing the effects of silent tappets on the Phantom engine.21th Jun 1934Box 17 \ 6  Scan253
Graph comparing power (BHP) and Mean Effective Pressure (MEP) against engine speed (RPM) for a Phantom II engine with different tappet setups.21th Jun 1934Box 17 \ 6  Scan254
Stamped cover page from the Print Room.21th Jun 1934Box 17 \ 6  Scan255
The theoretical effects of Cadillac automatic tappets on valve bounce speed and spring load for the Ph.II unit.21th Jun 1934Box 17 \ 6  Scan256
Table and analysis of valve spring loads against critical speeds for valve bounce.21th Jun 1934Box 17 \ 6  Scan257
Effect of cam profiles on actual and theoretical valve bouncing speeds.21th Jun 1934Box 17 \ 6  Scan258
Analysis of deviations in standard camshaft profiles and their effect on exhaust valve lift and velocity.21th Jun 1934Box 17 \ 6  Scan259
Graph plotting the speed at which the No.6 exhaust valve rides against the valve spring load for PI Unit BJ55.21th Jun 1934Box 17 \ 6  Scan260
Specification sheet for Phantom II camshaft forms, detailing lift and deviations.21th Jun 1934Box 17 \ 6  Scan261
Velocity diagram for a No.6 exhaust cam, showing designed vs actual performance.21th Jun 1934Box 17 \ 6  Scan262
Letter to A.E.C. Co. Ltd. inquiring why they have abandoned the Cadillac silent tappet.28th Jun 1934Box 17 \ 6  Scan263
Letter from Associated Equipment Company regarding an investigation into the General Motors valve lash mechanism.30th Jun 1934Box 17 \ 6  Scan264
Letter from The Associated Equipment Co. Ltd. discussing the adoption of compression ignition oil engines.30th Jun 1934Box 17 \ 6  Scan265
Letter acknowledging information received on the Cadillac Silent Tappet and returning prints.3rd Jul 1934Box 17 \ 6  Scan266
Letter to C.J. Rackham of The Associated Equipment Co. Ltd. enclosing prints and a report that were previously omitted.5th Jul 1934Box 17 \ 6  Scan267
Urgent request for parts for a valve spring rig.5th Jul 1934Box 17 \ 6  Scan268
Letter from Wilcox-Rich Corporation detailing the improvements and advantages of their valve tappets.25th Jun 1934Box 17 \ 6  Scan269
From Wilcox-Rich Corporation comparing Rich Type, Cylindrical, and Hydraulic engine tappets.25th Jun 1934Box 17 \ 6  Scan270
Letter from Wilcox-Rich Corporation discussing engine components like hydraulic lifters, salt-cooled valves and valve seat inserts.25th Jun 1934Box 17 \ 6  Scan271
Micro-examination report comparing the surface finish and decarburisation of piano wire from three English manufacturers.5th Jul 1934Box 17 \ 6  Scan272
Report page detailing hardness tests (Brinell and Vickers) and slag inclusion analysis on wire samples.5th Jul 1934Box 17 \ 6  Scan273
Cover note to accompany Report M960.13th Apr 1934Box 17 \ 6  Scan274
Laboratory photomicrograph of 'Brunton's Jupiter' material at 10 diameters magnification.13th Apr 1934Box 17 \ 6  Scan275
Blank page with handwritten reference numbers at the top.13th Apr 1934Box 17 \ 6  Scan276
Photomicrograph comparing materials from 'Brunton's Jupiter' and 'Shipman's' at 150 diameters magnification.13th Apr 1934Box 17 \ 6  Scan277
Reference numbers on a blank document.6th Jul 1934Box 17 \ 6  Scan278
Letter from General Motors regarding the blueprint for a ball valve installation in a silent tappet.6th Jul 1934Box 17 \ 6  Scan279
Requesting an alteration to the rocker shaft diameter on drawing E.84407.11th Jul 1934Box 17 \ 6  Scan280
Testing instructions from the A.E.C. for G.M. Type Automatic Tappets.12th Jul 1934Box 17 \ 6  Scan281
Requesting the fitting of specific inlet and exhaust valves to a standard Phantom Cylinder Head.17th Jul 1934Box 17 \ 6  Scan282
Urgent request for the Millwrights Department to fit a pulley and belt to a Valve Spring Rig.13th Jul 1934Box 17 \ 6  Scan283
Instructions for modifications to self-adjusting tappets and rocker bushes for model 28-EX.18th Jul 1934Box 17 \ 6  Scan284
Blueprint drawing of a Moon Oil Metering Screw (Part II).18th Jul 1934Box 17 \ 6  Scan285
Drawing detailing modifications to a bush for rockers, specifically for auto tappets.18th Jul 1934Box 17 \ 6  Scan286
The unsuccessful trial of stiffer, double-taper push rods in a Phantom II valve gear.24th Jul 1934Box 17 \ 6  Scan287
Drawing for a new steel push rod for the Phantom II valve gear.20th Jul 1934Box 17 \ 6  Scan288
Mathematical analysis detailing the effect of leakage in hydraulic tappets.24th Jul 1934Box 17 \ 6  Scan289
Technical analysis and comparison of leakage effects in silent tappets for various engine models.24th Jul 1934Box 17 \ 6  Scan290
Valve spring load inconsistencies causing valve bounce speed issues in a Ph.II engine.24th Jul 1934Box 17 \ 6  Scan291
Request to machine plungers for self-adjusting tappets (28-EX), including a list of current dimensions and clearances.26th Jul 1934Box 17 \ 6  Scan292
Conclusions on car engine valve gear, including drilled valves, manufacturing improvements, and hydraulic tappet adjustments.27th Jul 1934Box 17 \ 6  Scan293
Valve gear design, comparing Cadillac and Halford schemes, and considering the number of valves per cylinder.27th Jul 1934Box 17 \ 6  Scan294
Single-cylinder unit modifications and valve mechanism deflection.27th Jul 1934Box 17 \ 6  Scan295
Technical note on the inconsistency and lack of reliable data regarding valve bounce in engines.18th Jul 1934Box 17 \ 6  Scan296
Comparison table of camshaft and valve performance data across various engine models.18th Jul 1934Box 17 \ 6  Scan297
Technical analysis of engine valve gear bounce speeds, with a table comparing theoretical speeds for various car models.18th Jul 1934Box 17 \ 6  Scan298
Tappet spring performance, valve bounce speeds, and a comparison of Halford and G.M. type automatic tappets.18th Jul 1934Box 17 \ 6  Scan299


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