Graph comparing ignition advance required for maximum power on E.A.C. and Hispano engines, showing the effect of dual ignition.
| Identifier | Morton\M4.2\ img013 | |
| Date | 1st January 1923 guessed | |
| TITLE: IGNITION ADV. REQUIRED TO OBTAIN MAX. POWER ON E.A.C. & HISPANO. SHOWING EFFECT OF THE SYNCHRONISED DUAL IGNITION ON HISPANO. NOTES: E.A.C. & HISPANO GIVES AUDIBLE DETONATION TO APPROX 1000 RPM. HISPANO: GIVES AUDIBLE DETONATION TO 1000 RPM WHEN USING ONE IGNITION ONLY. WITH THE TWO IGNS. ON HISPANO THERE IS NO AUDIBLE DETONATION. Y-AXIS LABEL: FIRING POSN. DEGREES BEFORE TOP CENTRE. Y-AXIS VALUES: 50°, 40°, 30°, 20°, 10° X-AXIS LABEL: ENG. R.P.M. X-AXIS VALUES: 500, 1000, 1500, 2000, 2500 CURVE LABELS: E.A.C. HISPANO 1 PLUG HISPANO 2 PLUGS | ||
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).