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. 140 2nd December, 1938. S. HeronExperimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo, Esq., Ethyl Export Corporation, 135, East 42nd Street, NEW YORK. U.S.A. Dear HeronExperimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo, 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, | ||
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).