Rolls-Royce Archives
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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 of ignition advance versus engine RPM for E.A.C. and Hispano engines, illustrating the effect of dual ignition.

Identifier  ExFiles\Box 72\4\  scan0153
Date  12th March 1924 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 RPM WHEN USING ONE IGNITION ONLY
WITH THE TWO IGNS ON HISPANO THERE IS NO AUDIBLE DETONATION

FIRING POSN DEGREES BEFORE TOP CENTRE.
ENG. R.P.M.
E.A.C.
HISPANO 1. PLUG
HISPANO 2. PLUGS
  
  


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