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).
Ignition curve graph for a deturbulated head with a 6.5-1 compression ratio.
| Identifier | ExFiles\Box 163\7\ img285 | |
| Date | 7th April 1936 guessed | |
| IGNITION CURVE B.23.A.F. HEAD DETURBULATED C/R 6.5-1 ROAD FIGURE OF IG. AGLE. JUST TO AVOID DETONATION. HEAD CLEAN SHELL NO. 1. PETROL. PRELIMINARY DELCO REMY CURVE DEGREES ADVANCE B.T.D.C. 40 30 20 10 0 | ||