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).
Heat treatment and testing procedures for valve springs.
| Identifier | ExFiles\Box 56\2\ Scan041 | |
| Date | 24th October 1927 | |
| +290 RG. {Mr Rowledge} Hs. {Lord Ernest Hives - Chair} HL. BY. {R.W. Bailey - Chief Engineer} from R. {Sir Henry Royce} c. to BJ. Wor. {Arthur Wormald - General Works Manager} R1/M24.10.27. VALVE SPRINGS -CONDOR AND OTHERS. X.3616 X.2993 X.290 I cannot see any possible advantage of heat treatment more than - (1) Normalising. (2) Hardening. (3) Tempering. There is much risk of harm such as decarbonization of the outer surface with repeated.heating. We ought to learn something by testing on the rig some springs at different speeds, starting with 1500 crank. webs up to 3500 for car work i.e. from half to full, and then on to 10% faster than max. permitted. Your tests for car work at 1000 r.p.m. to 2000 r.p.m. is slower than road speeds. R. {Sir Henry Royce} | ||