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).
Design, materials, and testing of valve springs.
| Identifier | ExFiles\Box 56\2\ Scan042 | |
| Date | 12th November 1927 | |
| Hs. {Lord Ernest Hives - Chair} BY. {R.W. Bailey - Chief Engineer} RG. {Mr Rowledge} from R. {Sir Henry Royce} c. to BJ. Wor. {Arthur Wormald - General Works Manager} Y280 R1/M12.11.27. X. 290 X. 2993 X. 4587 VALVE SPRINGS. £ It seems waste of time to have anything to do with new design of valve springs which gives a figure of our simple formula of less than 1.20, except for the express purpose of comparing quality or state of materials. In fact, it suggests that springs should be made and tested under duties in which the figure of merit goes down to .8, to find the best metal and physical state for normal springs. I have suggested testing a softer spring until we are troubled with them on test losing their set. I have suggested trying Molybdenum steel for this purpose. If Brunton tempered wire continues to give good results, is not this safer than hardening after tempering, and does it not shew that a softer temper is better? Does not Mr. Pendlebury's successful double quenched springs suggest that its goodness lies in the lowest possible hardening temperature, as was our historical practice, and perhaps the highest possible tempering temperature, as in the case of Brunton's wire? R. {Sir Henry Royce} | ||