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).
Numbered list of vehicle component modifications and updates, with both typed and handwritten entries.
| Identifier | ExFiles\Box 92\3\ scan0053 | |
| Date | 20th November 1936 | |
| -2- (13) Lightened front bumper. (14) Wide rim wheels to improve car stability (15) Petrol pumps fitted in frame and on dashboard to facilitate experiments. latest type diaphragm in all cases. Third petrol pump fitted on dashboard with change over switch (16) Wraith wheel movement to reduce steering shocks. Sartoris ENGINE (17) Machine rivetted brake linings. Copper rivet (18) Special silent-bloc types (1) 4 Port cylinder heads and improved induction pipe. (2) Latest Hoyt type main and big end bearings. Improved oil feed. (3) Deletion of hydraulic tappets and new camshaft to suit. (4) Less costly cylinder liners. (5) Modified oil feed to rocker shaft to reduce wear on ball ends. (6) Less expensive sparking plugs. (7) " " valve springs. (8) Less costly filter element in air silencer. (9) L section piston rings (10) Carb float lever ratio altered to improve consumption Parts marked * at present fitted to the car. (11) less costly Exhaust valves (12) Close clearance inlet guide clearances to reduce top over oiling. Rm.{William Robotham - Chief Engineer} (19) P.R. Cast iron brake drums (20) Reversed propellor shaft (21) Increased hand brake travel (22) Increased front brake travel (23) Rear axle with larger thrust washers & strengthened case | ||