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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.
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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}
  
  


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