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).
Tappet clearance on an engine with an aluminium head during idling tests.
| Identifier | ExFiles\Box 108\3\ scan0085 | |
| Date | 18th March 1939 | |
| 600. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}1/R.18.3.39. 29 G.VI. ~~9-B.V.~~ With reference to the idling tests on this engine, we presume that care was taken that the tappet clearance measured was that on which the engine was actually run while the idling test was being carried out. We say this because this engine has an aluminium head and the tappet clearance, of course, varies more than on the ordinary engine. Rm.{William Robotham - Chief Engineer} | ||