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).
Advantages and disadvantages of returning to a pinned valve tappet design.
| Identifier | ExFiles\Box 158\4\ scan0002 | |
| Date | 25th November 1919 | |
| EH. from EP.{G. Eric Platford - Chief Quality Engineer} c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} X3733 EP{G. Eric Platford - Chief Quality Engineer}10/F25.11.19. RE. PINNED VALVE TAPPETS. With reference to Mr.Elliot's memo. DA{Bernard Day - Chassis Design}2/G20/11/19, I am not over-anxious that we should condemn our present tappets and return to the pinned tappet scheme. Although the present method has some vices, I feel that if we return to the old system we shall find vices which are worse. The only advantage we found on the old system was that it was easy to adjust the tappets owing to the pin being used to hold the tappet in position (which is really wrong), also that the tappet clearance was unaffected owing to the tappet turning round. The latter fault is certainly one which exists with the present tappets, and we have had cases in which the clearance has been affected as much as .003". This point, however, is a question of manufacture, and I do not see any reason why the tappet face cannot be ground square with the body of the tappet. EP.{G. Eric Platford - Chief Quality Engineer} R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. | ||