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).
Optimal timing specifications for a new camshaft, part number E.82448 1140, including a timing diagram.
| Identifier | ExFiles\Box 13\2\ 02-page167 | |
| Date | 13th December 1932 | |
| By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to MX.{John H Maddocks - Chief Proving Officer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/MA.13.12.32. TIMING NEW CAMSHAFT E.{Mr Elliott - Chief Engineer} 82448 1140. We have established that the best results are obtained with a timing (measured with .020 tappet clearance) where the inlet valve does not open earlier than 2° B.T.C. or close later than 6° A.T.C. The timing, measured at the mean of these two positions, is approximately:- [Diagram Labels] 2 9 Ex 50 IN 50 .020 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||