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).
Use of pinned valve tappets to achieve a quieter engine.
| Identifier | ExFiles\Box 158\4\ scan0005 | |
| Date | 3rd December 1919 | |
| R.R. 235 A.{Mr Adams} 100 T/P S.F. 575. 16-4-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2354. X 3733 R7/G3.12.19. ---------- To BN.{W.O. Bentley / Mr Barrington} from R.{Sir Henry Royce} Copy to CJ. " " EH. " " EP.{G. Eric Platford - Chief Quality Engineer} " " DA.{Bernard Day - Chassis Design} X.3733. " " CK.{Mr Clark} X.3647. RE PINNING OF VALVE TAPPETS. --------------------------------- & We cannot expect better work than we have been having in the past. It is imperative that we have silent valves as well as silent pistons if we want to get a quiet engine. I understood that both Mr. Platford and Mr. Hives wished for pinned tappets. I have lately come to the conclusion that they are worth the trouble. I want you therefore to kindly fit them to the next chassis which goes on 10,000 miles test. By removing the clearance from our present quiet valves we can obtain/valves without risk, and since it is so important for us to avoid such slight noises that occur from a detectable piston knock, it is also equally important that weavoid from a valve tappet. I would like to point out that our valve mechanism, when properly adjusted, remains in good condition a long time owing to the absence of wear. It is a pity therefore for it to be incapable of perfect adjustment through the tappet revolving and being somewhat out of truth. R.{Sir Henry Royce} | ||