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 deturbulated cylinder head.
| Identifier | ExFiles\Box 101\3\ scan0007 | |
| Date | 16th May 1936 | |
| 25/30 IGNITION GOVERNOR CURVES. DETURBULATED HEAD. TEST CARRIED OUT WITH SHELL NO: 1. AND STANDARD CHASSIS EXHAUST SILENCER. E.60660 HEAD DETURBULATED TO Lec 5002 (5.86:1 COMP: RATIO) STD: VALVES 1.4 DIA: INLET 1.225 DIA: EXHAUST STD: 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. S.P.26. | ||