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).
Blueprint graph showing the preliminary Delco Remy ignition curve for a B.23.A.F. deturbulated head.
| Identifier | ExFiles\Box 90\1\ Scan180 | |
| Date | 8th April 1936 guessed | |
| IGNITION CURVE B.23.A.F. HEAD DETURBULATED C/R.{Sir Henry Royce} 6·5-1 DEGREES ADVA B.T.D.C. M.P.H. ROAD FIGURE OF IG: AGU: JUST TO AVOID DETONATION. HEAD CLEAN SHELL N° 1 PETROL PRELIMINARY DELCO REMY CURVE | ||