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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).
Superior performance of poppet valve silent tappet plungers compared to ball valves at high speeds.

Identifier  ExFiles\Box 17\6\  Scan301
Date  4th September 1934
  
Y7060
To E.{Mr Elliott - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
c. to Bv.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}10/KW.4.9.34.

We were somewhat mystified as to why the poppet valve silent tappet plungers were more satisfactory at high speeds than the ball valves on our recent tests. Attached is a suggestion as to why this may be so.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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