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).
Ignition timing and the requirement for automatic advance on various engine models.

Identifier  ExFiles\Box 73\3\  scan0342
Date  9th January 1924
  
contd:-
-2-
Hsl/LG1 9.1.24.
we require approximately the same as we do on the 20 HP. We can obtain maximum power on the 40/50 with Magneto ignition set at 23° B.T.D.C. for the advance. On the EAC. we require 40° B.T.D.C. This means we are more sensitive to the control and therefore a definite reason why we require automatic advance for both ignitions on the EAC. although it has not been found essential with the standard 40/50 HP.
HWS
  
  


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