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).
Engine slow running improvements using camshaft No.1636 and Cadillac tappets.
| Identifier | ExFiles\Box 4\1\ 01-page175 | |
| Date | 5th December 1934 | |
| x4694 To E.{Mr Elliott - Chief Engineer} from Ha/Hs.{Lord Ernest Hives - Chair} c. to Her. c. to Hy.{Tom Haldenby - Plant Engineer} Ha/Hs.{Lord Ernest Hives - Chair}2/AW.5.12.34. Further to our report on slow running. The engine on the test bed with the camshaft No.1636 running with Cadillac tappets shows a marked improvement in slow running. The timing at .020 tappet clearance is as follows :- I.O. 7° B.T.D.C. E.O. T.D.C. I.C. 53° A.B.D.C. E.C. 25° A.B.D.C. This camshaft was the best we could do with the original SpectreCodename for Phantom III cam forms. It is always difficult to get a true impression of slow running on the test bed, and therefore we cannot yet say that we are good enough. It appears that Lec.A120 should cover our requirements, as far as cam forms are concerned. Ha/Hs.{Lord Ernest Hives - Chair} | ||