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 from the Bentley single cylinder tests showing the effect of dual ignition on power output, BMEP, and ignition advance against RPM.
| Identifier | ExFiles\Box 133\2\ scan0088 | |
| Date | 5th January 1944 guessed | |
| BENTLEY SINGLE CYLINDER TESTS. SHEET 5 EFFECT OF DUAL IGNITION ON POWER OUTPUT N° 2 RAMP HEAD (I.E.C. 3871) COMPRESSION RATIO - 6.5 INLET VALVE - 1.500" DIA EXHAUST VALVE - 1.400 DIA NATURALLY ASPIRATED AEROLITE PISTON ZENITH TRIPLE DIFFUSER CARBURETTOR (32 M/M CHOKE) OPEN EXHAUST FUEL - D.T.D. 224 TIMED TO GIVE MAXIMUM POWER AT 3000 RPM BRAKE HORSE POWER B. M.{Mr Moon / Mr Moore} E.{Mr Elliott - Chief Engineer} P. (LBS./SQ. IN.) IGNITION ADVANCE (DEGREES) R.P.M. NECESSARY IGNITION ADVANCE ONE PLUG TWO PLUGS | ||