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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).
Letter asking S. Heron of Ethyl Export Corporation for information on engine exhaust valve technology and performance.

Identifier  ExFiles\Box 174\2\  img293
Date  2nd December 1938
  
Rml/R.{Sir Henry Royce}

140

2nd December, 1938.

S. Heron, Esq.,
Ethyl Export Corporation,
135, East 42nd Street,
NEW YORK. U.S.A.

Dear Heron,

Do you accept the statement that for a given M.E.P. the exhaust side valve will run hotter than the corresponding overhead valve ?

In our experience, hot exhaust valves make their presence felt by the engine continuing to run after switching off. This can be completely cured by using sodium-cooled exhaust valves on a high power engine, but we wonder if you know of a simpler means of achieving our objective other than by the accepted way of bringing the valve guide as far up the stem as possible.

Have you found the shape of the exhaust valve head produces any particular result with regard to reducing the scrubbing action of the gas ? Is the valve temperature sensitive to port shape ? Do you find that hydraulic lash adjusters reduce the valve temperature ?

These questions we shall be very much obliged to you, and are only too willing to reciprocate should you happen to have any information which would be of use to you.

Yours sincerely,
  
  


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