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).
Providing an estimated operational temperature range for a valve spring.
| Identifier | ExFiles\Box 158\5\ scan0071 | |
| Date | 9th May 1940 | |
| To:- Rm.{William Robotham - Chief Engineer} Valve Spring Temperature. In reply to your memo 12.4.40, which has only recently been handed to us to deal with, we have no record of valve spring temperature in flight. All we can say is that the maximum temperature is below 450°C the tempering temperature of the wire, and probably below 350°C. From the carbon deposited on the springs the temperature must be over 120°C. Lr{Mr Ellor}/Psn. Lr{Mr Ellor}/(PSR) | ||