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 comparing ignition advance against engine RPM for E.A.C. and Hispano engines, detailing detonation and the effect of dual ignition.
| Identifier | ExFiles\Box 180\M4\M4.2\ img013 | |
| Date | 25th February 1923 guessed | |
| IGNITION ADV. REQUIRED TO OBTAIN MAX. POWER ON E.A.C. & HISPANO. SHOWING EFFECT OF THE SYNCHRONISED DUAL IGNITION ON HISPANO. E.A.C. & HISPANO GIVES AUDIBLE DETONATION TO APPROX. 1000 R.P.M. HISPANO GIVES AUDIBLE DETONATION TO 1000 R.P.M. WHEN USING ONE IGNITION ONLY WITH THE TWO IGNS ON HISPANO THERE IS NO AUDIBLE DETONATION Y-AXIS: FIRING POSN DEGREES BEFORE TOP CENTRE X-AXIS: ENG. R.P.M. CURVES: E.A.C. HISPANO 1 PLUG HISPANO 2 PLUGS | ||