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).
Blueprint graph of ignition advance curves against engine RPM for different cylinder head designs.

Identifier  ExFiles\Box 134\2\  scan0133
Date  11th August 1937
  
FIG: III
IGNITION ADVANCE CURVES
IGNITION ADVANCE
R.P.M.
① No: 1 HEAD AND No: 2 HEAD WHEN TURBULENT. THROAT AREAS = 1.01 AND .96 □"
② No: 2 HEAD DE-TURBULATED. THROAT AREA = 1.16 □"
③ No: 4 INCLINED VALVE HEAD IN ALUMINIUM. THROAT AREA = 1.57 □"
④ THROAT PLUG POSITION USED IN EACH CASE. STANDARD 3 1/2 LITRE BENTLEY (SINGLE CYLINDER UNIT.)
E.D.
11.8.37
  
  


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