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).
Graph plotting the variation of cam duration by tappet clearance for a 4 1/4 Litre Bentley engine.
| Identifier | ExFiles\Box 82\4\ scan0392 | |
| Date | 1st October 1936 guessed | |
| 4 1/4 LITRE BENTLEY POWER DEVELOPMENT S.S. CAMSHAFT VARIATION OF CAM DURATION BY TAPPET CLEARANCE CAMSHAFT EB 1085 (STD 4 1/4 LITRE PRODUCTION) COMP RATIO 9:1 (Ex 20943) * 6 AMAL CARBS. STRAIGHT ON INLET PORTS (1) I.O. 3°BT{Capt. J. S. Burt - Engineer} E.O. 47°BB) STD TIMING I.C. 5°AB E.C. 6°AT) APPROX) TIMING TAKEN @ .020 CLR X 1.187 THROTTLE BORE (2) IN TAPPETS = .025 Ex " = .008 (3) IN " = .008 Ex " = .025 B.H.P. B.M.E.P. R.P.M. CTS{C. Trot Salt - Carburation} | ||