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 curves for various Phantom engine configurations against engine RPM.

Identifier  ExFiles\Box 17\6\  Scan014
Date  2nd December 1926
  
SHEET 2
IGNITION ADVANCE ON FLYWHEEL (DEGREES).
R.P.M OF ENGINE.
IGNITION ADVANCE CURVES.
BOTH IGNITIONS ARE SYNCHRONISED IN ALL CASES.
STD. PHANTOM (COMP. RATIO = 4:1 : 1)
ALUM. PHANTOM (4.45 : 1)
ALUM. PHANTOM WITH 1.600 DIA. VALVES, (COMP. RATIO - 4.69 : 1)
ALUM. PHANTOM WITH HEAD TO L.C. 2230 (COMP. RATIO = 4.95 : 1)
AHP
2-12-26
  
  


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