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 Bentley ignition governor curves for a deturbulated head.
| Identifier | ExFiles\Box 82\4\ scan0329 | |
| Date | 5th June 1936 | |
| SP{Mr Spinney} 29 DETURBULATED HEAD BENTLEY IGNITION GOVERNOR CURVES TEST CARRIED OUT WITH SHELL N°1 AND STD CHASSIS EXHAUST SILENCER. E.B.2560 CYL HEAD WITH TURBULENT LIPS MACHINED AWAY AS SHOWN ON THE DRAWING L.E.C. 5002 6.3 : 1 C.R- STD VALVES 1.6 DIA. INLET 1.400 DIA. EXHAUST. ① IDEAL LINE (MINIMUM ADVANCE FOR MAX. POWER) ② LINE TO CUT OUT DETONATIONS. ③ 2% POWER DROP BY RETARDING. ④ PROPOSED LINE FOR DELCO REMY AUTO. SPARK POSITION FLYWHEEL °BTDC ENGINE R.P.M. | ||