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).
Modifications to the rockers to increase the valve lift for a 40/50 model.
| Identifier | ExFiles\Box 13\2\ 02-page107 | |
| Date | 18th June 1931 | |
| To By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 87090 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}7/KT.18.6.31. 40/50 VALVE LIFT. On the new cams which W.W. have given us, we shall have a lift of .480 We can get some very useful results by running our existing standard shafts with the same valve lift. By/Ss.{S. Smith} has looked into the question and finds that this extra lift can be obtained relatively easily out of the existing rockers by boring them slightly eccentric and fitting an eccentric bush. Will you please instruct a set of such rockers with the necessary pedestals. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||