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 showing ignition governor curves for a 25/30 standard turbulent head engine.
| Identifier | ExFiles\Box 82\4\ scan0326 | |
| Date | 16th May 1936 | |
| 25/30 IGNITION GOVERNOR CURVES. STANDARD TURBULENT HEAD. TEST CARRIED OUT WITH SHELL No1. AND STANDARD CHASSIS EXHAUST SILENCER. E.60660 STD: PROD: CYL: HEAD (TURBULENT TYPE.) 6:1 COMP: RATIO. STANDARD VALVES 1.4 DIA: INLET 1.225 DIA: EXHAUST STANDARD STROMBERG IND'N SYSTEM. ① IDEAL LINE (MINIMUM ADVANCE FOR MAX: POWER.) ② LINE TO CUT OUT DETONATIONS. ③ 2% POWER DROP BY RETARDING. ④ PROPOSED LINE AS GIVEN BY AUTOMATIC OF SPECIALLY PREPARED GOVERNOR. SPARK POSITION FLYWHEEL ° BTDC ENGINE R.P.M. | ||