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).
Specification sheet detailing valve timings for various camshafts.
| Identifier | ExFiles\Box 158\4\ scan0156 | |
| Date | 14th June 1937 | |
| To Rm{William Robotham - Chief Engineer} VALVE TIMINGS. 1360 14.6.37 (1) Standard 30.HP. camshaft .020" tappet clearance. IO 6° PTDC. E.O. 44° BBDC. IC 44° PBDC. E.C. 9° PTDC. (2) Wraith II. Camshaft .020" tappet clearance. IO 6° PTDC. E.O. 44° BBDC. 2 Inlet cams. IC.44° PBDC. E.C. 6° BTDC. (3) " ". " .010" " " IO. 10° BTDC. E.O. 60° BBDC. IC. 60° BPDC. E.C. 10° PTDC. (4) " " " .004" Inlet " ".006" Exh. " " IO. 30° BTDC. E.O. 80° BBDC. IC. 80° PBDC. E.C. 30° PTDC. Rm{William Robotham - Chief Engineer}/Whym | ||