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, questioning if rocker alterations are the true cause of improvement.
| Identifier | WestWitteringFiles\Q\April1927-June1927\ 24 | |
| Date | 20th April 1927 | |
| HS.{Lord Ernest Hives - Chair} TO BY.{R.W. Bailey - Chief Engineer} (struck out) FROM R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} (struck out) (At Le CanadelHenry Royce's French residence.) C. to BJ. WOR.{Arthur Wormald - General Works Manager} ORIGINAL R4/M16.4.27. REC'D DURING EASTER, AND DESPATCHED 20.4.27. PHANTOM TAPPET NOISES. X8060 T8090 (struck out) 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} RECEIVED HS{Lord Ernest Hives - Chair} APR 21 1927 REC'D AP. 21. 1927 | ||