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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).
Limits of reducing the exhaust valve size without a loss of power, referencing curve Hs.1214.

Identifier  ExFiles\Box 17\6\  Scan213
Date  19th May 1934
  
X7060
To E.{Mr Elliott - Chief Engineer}

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}7/KW.19.5.34.

With reference to our conversation re lightening the Exhaust Valve, we have now got out our figures on the attached curve Hs.{Lord Ernest Hives - Chair}1214, from which it will be seen that we cannot reduce the Exhaust Valve size by more than .025" without losing power.

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


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