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 Ignition Advance against B.M.E.P. curves at 1000 R.P.M. for various Aluminium Phantom engine configurations.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 45 | |
| Date | 10th December 1920 guessed | |
| SHEET. 1. IGNITION ADVANCE / B.M.E.P. CURVES FOR 1000 R.P.M. (CORRECTED TO N.T.P.) B.M.E.P. (LBS PER SQ. IN.) ALUM PHANTOM WITH HEAD TO L.E.C. 2230 (COMP. RATIO. = 4.95:1). ALUM PHANTOM (4.69:1). ALUM PHANTOM WITH 1.600 DIA. VALVES. (COMP. RATIO 4.69:1). IGNITION ADVANCE ON FLYWHEEL (DEGREES). (BOTH IGNITIONS SYNCHRONISED.) | ||