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).
Phantom engine valve springs, comparing standard single type to double springs which cause a clicking noise.
| Identifier | ExFiles\Box 66a\2\ scan0079 | |
| Date | 11th May 1928 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} C. to HJ. Nor. C. to AG. E.{Mr Elliott - Chief Engineer} C. to BY.{R.W. Bailey - Chief Engineer} [STAMP: RECEIVED MAY 1928] [HANDWRITTEN: Y8060] Hs{Lord Ernest Hives - Chair}4/LG11.5.28. [HANDWRITTEN: X290 (crossed out)] [HANDWRITTEN: Y7060] PHANTOM - VALVE SPRINGS. The first engines being produced with the turbulent head are instructed with standard single type valve springs. We have had comparatively very little trouble with these springs. The valve clicking noise has been consistent on 5 or 6 engines to which the double springs have been fitted. Hs.{Lord Ernest Hives - Chair} | ||