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 tappet noises and the effectiveness of altering the rockers to quiet the valves.
| Identifier | ExFiles\Box 66a\2\ scan0226 | |
| Date | 16th April 1927 | |
| Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} c, to BJ. War. X8090 R4/M16.4.27. PHANTOM TAPPET NOISES. X.8060 X.8090 I think we should be quite certain that the alteration of the rockers is really the thing which is making the valves fall on their seats more quietly. E.{Mr Elliott - Chief Engineer} and R.{Sir Henry Royce} cannot see any reason for a definite improvement because the scrub is even greater, and the valve must be the full amount of the slack out of place. I do not say Derby is wrong, but owing to want of reason for the improvement, I say it should be doubly confirmed. R.{Sir Henry Royce} | ||