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).
Requesting experiments on the 40/50 HP engine, specifically altering the camshaft to increase power output.
| Identifier | ExFiles\Box 13\2\ 02-page069 | |
| Date | 12th May 1931 | |
| To RH{R. Hollingworth}6. From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X7090 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KT.12.5.31. INCREASE IN POWER OUTPUT 40/50 HP. We wish to carry out some experiments on the 40/50, altering the camshaft. We find that the base circle of the 40/50, and the R.{Sir Henry Royce} engine are both 1.150" diameter. We are therefore asking you in the attached blueprint to make two 40/50 camshafts with R.{Sir Henry Royce} engine cam forms, in one case with 114° between the cams and in the other case 110°. Will you please let us know if there is any difficulty in making these camshafts. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||