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).
Valve steel and tappet clearances.
| Identifier | ExFiles\Box 47\3\ Scan465 | |
| Date | 27th July 1932 | |
| W/N. Br.{T. E. Bellringer - Repair Manager} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} M 4117 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/MJ.27.7.32. 1-GN.. With reference to Br.1/A22.7.32. Unfortunately we have no other valve steel that we can recommend. We have always found that if the tappets are set closely this trouble is worse than if a reasonable clearance is given. We know that by selection it is possible to get a set of quiet tappets that can be run at .006 clearance. We suggest that you try and fit in with some tappets that will enable rather more clearance to be used. In the meantime we are pursuing several tests to eliminate the trouble. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||