| Description | Date | Identifier | |
| Construction of a rig to study valve spring motion and bounce. | 18th Jul 1934 | Box 17 \ 6 Scan300 | |
| Superior performance of poppet valve silent tappet plungers compared to ball valves at high speeds. | 4th Sep 1934 | Box 17 \ 6 Scan301 | |
| Comparison of poppet versus ball valves in G.M. hydraulic tappets, focusing on performance at high speeds. | 4th Sep 1934 | Box 17 \ 6 Scan302 | |
| Technical explanation of oil leakage and valve riding in hydraulic tappets, comparing different tappet designs. | 4th Sep 1934 | Box 17 \ 6 Scan303 | |
| Analysis of the action of valve gear, plungers, and valves, focusing on oil flow and quiet running. | 4th Sep 1934 | Box 17 \ 6 Scan304 | |
| Technical description of a poppet valve's operation and comparison with ball valves. | 4th Sep 1934 | Box 17 \ 6 Scan305 | |
| Specifications for two new sets of valve springs for the Phantom II engine. | 6th Sep 1934 | Box 17 \ 6 Scan306 | |
| Instructions for fitting out Test Bed Unit BJ-55 to complete tests on Phantom Silent Tappets. | 6th Sep 1934 | Box 17 \ 6 Scan307 | |
| Results of 10,000-mile tests on Halford and Cadillac silent tappets and proposing design improvements. | 6th Sep 1934 | Box 17 \ 6 Scan308 | |
| List of proposed engine modifications regarding valve springs, camshaft, push rods, and tappets. | 6th Sep 1934 | Box 17 \ 6 Scan309 | |
| Recommendations for redesigning the relief valve and increasing the size of the Bentley oil pump. | 6th Sep 1934 | Box 17 \ 6 Scan310 | |
| Drawing specifications for Phantom Self-Adjusting Tappets. | 17th Sep 1934 | Box 17 \ 6 Scan311 | |
| The specifications for double valve springs for the Phantom II model. | 18th Sep 1934 | Box 17 \ 6 Scan312 | |
| The material specification for a shaft for eccentrics on Phantom Cadillac type silent tappets. | 18th Sep 1934 | Box 17 \ 6 Scan313 | |
| The material specification for a shaft for eccentrics on Phantom Cadillac type silent tappets. | 19th Sep 1934 | Box 17 \ 6 Scan314 | |
| Request to modify the clearance for silent tappets on a Phantom II model. | 24th Oct 1934 | Box 17 \ 6 Scan315 | |
| Modifications required for 28-EX Silent Tappets from a BJ-55 unit. | 3rd Nov 1934 | Box 17 \ 6 Scan316 | |
| Instructions on how to set silent tappets for an engine. | 3rd Nov 1934 | Box 17 \ 6 Scan317 | |
| Collapsed oil filter gauze on car 28-EX and requesting a new filter based on design Hs.1595. | 7th Nov 1934 | Box 17 \ 6 Scan318 | |
| Instructions for the removal and fitting of rocker shafts and tappets. | 27th Nov 1934 | Box 17 \ 6 Scan319 | |
| Test report on Ph.II Silent Tappets and E.82448 Camshaft. | 27th Nov 1934 | Box 17 \ 6 Scan320 | |
| Graph plotting power comparisons using Cadillac type silent tappets, showing BHP and MEP against RPM. | 26th Jun 1931 | Box 17 \ 6 Scan321 | |
| Extremely faded and illegible document with a clear 'Print Room' stamp. | 27th Nov 1934 | Box 17 \ 6 Scan322 | |
| Development work investigating troubles with push rod operated valve mechanisms in car engines. | 29th Nov 1934 | Box 17 \ 6 Scan323 | |
| Development of a photographic valve motion indicator to study the difference between actual and theoretical valve lift at speed. | 29th Nov 1934 | Box 17 \ 6 Scan324 | |
| Analysis of valve gear performance, push rod deflection, and spring surge at various engine speeds using an oscilloscope. | 29th Nov 1934 | Box 17 \ 6 Scan325 | |
| Schematic diagram of a photographic valve lift indicator. | 22th Sep 1924 | Box 17 \ 6 Scan326 | |
| Blank page with a Print Room stamp from Derby. | 29th Nov 1934 | Box 17 \ 6 Scan327 | |
| Four graphs showing Phantom II valve spring rig performance at different RPMs. | 29th Nov 1934 | Box 17 \ 6 Scan328 | |
| Performance graphs comparing different valve springs and push rod stiffness on a Phantom II valve spring rig. | 29th Nov 1934 | Box 17 \ 6 Scan329 | |
| Reverse side of a document with a Print Room stamp. | 29th Nov 1934 | Box 17 \ 6 Scan330 | |
| Testing of .CC125 clearance hydraulic units for Phantom II silent tappets. | 4th Dec 1934 | Box 17 \ 6 Scan331 | |
| Challenges and considerations of introducing silent tappets on the Phantom model. | 18th Jan 1935 | Box 17 \ 6 Scan332 | |
| Satisfactory performance of silent tappets fitted to a Phantom car and their potential introduction. | 28th Jan 1935 | Box 17 \ 6 Scan333 | |
| Viability of producing and fitting silent tappets to the remaining Phantom II chassis. | 30th Jan 1935 | Box 17 \ 6 Scan334 | |
| Ongoing tests of Phantom II and Spectre engine tappets and the investigation into automatic tappets. | 30th Jan 1935 | Box 17 \ 6 Scan335 | |
| Need for rig tests on tappets and making the Spectre 'fool-proof' before production. | 30th Jan 1935 | Box 17 \ 6 Scan336 | |
| Cost of servicing standard tappets and considering the introduction of hydraulic tappets for the Phantom model. | 31th Jan 1935 | Box 17 \ 6 Scan337 | |
| Noisy tappets on the Phantom II chassis, customer complaints, and the recommendation to introduce hydraulic tappets. | 4th Feb 1935 | Box 17 \ 6 Scan338 | |
| Test report on the performance of hydraulic adjusted tappets. | 20th Mar 1935 | Box 17 \ 6 Scan339 | |
| Analysis of the resistance load of plungers in relation to rocker arm loads and clearances. | 20th Mar 1935 | Box 17 \ 6 Scan340 | |
| Test results for hydraulic tappets, measuring plunger resistance with various loads. | 20th Mar 1935 | Box 17 \ 6 Scan341 | |
| Test report on the condition of 28-EX engine valves and hydraulic plungers after standing overnight. | 25th Mar 1935 | Box 17 \ 6 Scan342 | |
| Test results for hydraulic tappet plunger resistance under various loads and clearances. | 25th Mar 1935 | Box 17 \ 6 Scan343 | |
| Blueprint detailing inlet and exhaust valve timing diagrams for silent tappets. | 21th Mar 1919 | Box 17 \ 6 Scan344 | |
| Performance of hydraulic tappets on car 104-MY sold to Sir Stewart Duke-Elder. | 17th Sep 1935 | Box 17 \ 6 Scan345 | |
| Mounting steel artillery wheels on the Phantom model with a new axle. | 14th Aug 1926 | Box 17 \ 7 Scan001 | |
| From 'R' questioning why smaller road wheels are not used on cars. | 14th May 1928 | Box 17 \ 7 Scan002 | |
| Standardisation proposal for shorter and lighter wheels and hubs to improve design. | 2nd May 1928 | Box 17 \ 7 Scan003 | |
| Standardisation report for a new chassis part, detailing fitting information and costs. | 12th Nov 1928 | Box 17 \ 7 Scan004 | |
| Improving steering on the 'SS' Phantom by increasing the wheel off-set. | 13th Aug 1928 | Box 17 \ 7 Scan005 | |
| The preliminary test of front wheels with increased off-set to eliminate tramping and snatchy steering. | 23th Jul 1928 | Box 17 \ 7 Scan006 | |
| Internal request to order tyres from Dunlops for a 40/50 HP car. | 4th Sep 1928 | Box 17 \ 7 Scan007 | |
| Wheel and tyre size changes for the 'SS' model to lower the car for French conditions. | 1st Sep 1928 | Box 17 \ 7 Scan008 | |
| Slight modifications to the 'SS' Rear Axle to accommodate a rebuilt wire wheel. | 21th Sep 1928 | Box 17 \ 7 Scan009 | |
| The requirement for six 20-inch rims for the 'SS' Phantom. | 22th Oct 1928 | Box 17 \ 7 Scan010 | |
| Specification and parts list for an order of S.S. Road Wheels and Hubs. | 24th Oct 1928 | Box 17 \ 7 Scan011 | |
| Requesting sets of wheels and hubs for Mr. Royce's car to be completed by the end of November. | 24th Oct 1928 | Box 17 \ 7 Scan012 | |
| Follow-up regarding an order for S.S. road wheels, hubs, and tyres, requesting a delivery promise from the Dunlop Co. | 10th Nov 1928 | Box 17 \ 7 Scan013 | |
| Order for three sets of 21-inch wheels and corresponding spare wheel carriers for the S.S. chassis. | 12th Nov 1928 | Box 17 \ 7 Scan014 | |
| Arrangement for a rear-mounted two-wheel carrier for 'SS' models. | 14th Nov 1928 | Box 17 \ 7 Scan015 | |
| From coachbuilder Hooper & Co. requesting a wheel for chassis EX 19 to confirm type and size for ordering discs. | 23th Nov 1928 | Box 17 \ 7 Scan016 | |
| Letter to Messrs. Hooper & Co. regarding the delivery of a wheel for chassis 19-EX. | 26th Nov 1928 | Box 17 \ 7 Scan017 | |
| Letter to Messrs. Hoopers Ltd. regarding the dispatch of a 21' short hub wire wheel. | 29th Nov 1928 | Box 17 \ 7 Scan018 | |
| Despatch of a 21-inch wheel with tyre to Messrs. Hoopers for experimental car 19-EX. | 30th Nov 1928 | Box 17 \ 7 Scan019 | |
| 10,000-mile test of car 18-EX, feedback, and development of the 'SS' car. | 18th Dec 1928 | Box 17 \ 7 Scan020 | |
| Compatibility and testing of different wheel sizes on 18-EX and SS cars. | 2nd Feb 1929 | Box 17 \ 7 Scan021 | |
| Despatch of a bonnet for car 23-EX to the Carlton Carriage Co. | 2nd Feb 1929 | Box 17 \ 7 Scan022 | |
| Wheel rim sizes for 'SS' cars, comparing 20 inch and the standard 21 inch options. | 20th Feb 1929 | Box 17 \ 7 Scan023 | |
| Advantages of smaller wheels and comparing wheel sizes for the 18-EX and 20 HP models. | 2nd Feb 1929 | Box 17 \ 7 Scan024 | |
| Secret memo querying the decision to use two different wheel sizes for the 'VSS' car, citing potential sales issues. | 1st Mar 1929 | Box 17 \ 7 Scan025 | |
| Confirming the decision to use smaller wheels on the first 'SS' car. | 2nd Mar 1929 | Box 17 \ 7 Scan026 | |
| Directive to change the wheel rim size from the standard 21' to 20' for the SS. Chassis - J.2. Series. | 4th May 1929 | Box 17 \ 7 Scan027 | |
| Confirming the wheel and spare rim specifications for the 'SS' / 21-EX car for use in France. | 11th Mar 1929 | Box 17 \ 7 Scan028 | |
| Testing the 'SS' engine mounting, detailing challenging road conditions and the resulting radiator wobble and directional instability. | 2nd Mar 1929 | Box 17 \ 7 Scan029 | |
| The investigation into radiator wobble, testing different chassis and engine mounting configurations. | 2nd Mar 1929 | Box 17 \ 7 Scan030 | |
| Development avenues and testing schemes for engine damping and frame flexibility. | 2nd Mar 1929 | Box 17 \ 7 Scan031 | |
| Test run results concerning road wheel diameter, booming noises, and exhaust manifolds. | 2nd Mar 1929 | Box 17 \ 7 Scan032 | |
| Manifold experiments and body noise testing related to chassis vibration. | 10th May 1929 | Box 17 \ 7 Scan033 | |
| Urgent request for special wheels for a Phantom vehicle from Messrs. Dunlops. | 10th May 1929 | Box 17 \ 7 Scan034 | |
| Secret memorandum discussing the appropriate wheel size for 'S.S.' models and the impact on steering and appearance. | 27th May 1929 | Box 17 \ 7 Scan035 | |
| Wheel and tyre sizes, steering issues, and a proposed change by Dunlop. | 28th May 1929 | Box 17 \ 7 Scan036 | |
| Telegram requesting spare parts including wheels, spring clips, axle packing and tyres to be sent to Sevres, France. | 19th Jul 1929 | Box 17 \ 7 Scan037 | |
| On comparative tyre size tests in France, confirming the retention of the 675' diameter and advising communication with Dunlops. | 17th Jul 1929 | Box 17 \ 7 Scan038 | |
| Comparison of the power output at the road wheels for the Phantom and S.S. cars. | 22th Aug 1929 | Box 17 \ 7 Scan039 | |
| Graph comparing the power at the road wheels (B.HP) against engine R.P.M. for the S.S. and Phantom models. | 22th Aug 1929 | Box 17 \ 7 Scan040 | |
| Querying power output differences between SS Experimental Cars and Production Chassis and requesting dynamometer testing. | 23th Aug 1929 | Box 17 \ 7 Scan041 | |
| Requesting an extension on the temporary admission of parts for chassis 21-EX. | 26th Aug 1929 | Box 17 \ 7 Scan042 | |
| Expressing caution about standardizing 20-inch wheels with 7-inch tyres until satisfactory tests are completed. | 12th Jul 1929 | Box 17 \ 7 Scan043 | |
| Specifying the wheel jack requirements for the Phantom II and 20 HP models. | 27th Sep 1929 | Box 17 \ 7 Scan044 | |
| Objections to carrying two spare wheels at the rear of cars, focusing on increased length and manoeuvrability. | 29th Nov 1929 | Box 17 \ 7 Scan045 | |
| The effects of fitting two rear spare wheels to the Phantom II, discussing appearance, space, steering, and ride quality. | 3rd Dec 1929 | Box 17 \ 7 Scan046 | |
| Misunderstanding about the spare wheels for the Prince of Wales' Phantom II car. | 5th Dec 1929 | Box 17 \ 7 Scan047 | |
| Letter from Rolls Royce of America to Rolls Royce Ltd. discussing the outcome of a Tire and Rim Division meeting regarding wheel choices for the L.H. PII. | 16th Dec 1929 | Box 17 \ 7 Scan048 | |
| Letter from the Society of Automotive Engineers regarding an Unconfirmed Memorandum of Meeting for the Tire and Rim Division. | 12th Dec 1929 | Box 17 \ 7 Scan049 | |
| Unconfirmed memorandum of a meeting for the Tire and Rim Division. | 4th Dec 1929 | Box 17 \ 7 Scan050 | |
| Meeting minutes discussing decisions on standardizing tire and rim sizes. | 4th Dec 1929 | Box 17 \ 7 Scan051 | |
| Meeting minutes discussing and voting on amendments to tire and rim specifications for passenger and commercial vehicles. | 13th Dec 1929 | Box 17 \ 7 Scan052 | |
| Meeting minutes concerning revisions to tire and rim standards for commercial vehicles. | 13th Dec 1929 | Box 17 \ 7 Scan053 | |
| Table detailing S.A.E. standards for balloon tires and rims for passenger cars. | 4th Dec 1929 | Box 17 \ 7 Scan054 | |
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