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).
Power comparison graph of three different cylinder head designs, plotting B.M.E.P. and Main Engine B.HP against R.P.M.

Identifier  ExFiles\Box 134\2\  scan0143
Date  20th August 1937
  
HIGH POWER HEAD. FIG. VII.
POWER COMPARISON OF CYLINDER HEADS.
B.M.E.P.
MAIN ENGINE B.H.P.
R.P.M.
① No. 2 CYLINDER HEAD THROAT AREA = .96 □"
EXHAUST VALVE = 1.500" DIA. C.R. = 6.3
② No. 1 CYLINDER HEAD THROAT AREA = 1.02 □"
EXHAUST VALVE = 1.500" DIA. C.R. = 6.2
③ No. 4 CYLINDER HEAD THROAT AREA = 1.57 □"
EXHAUST VALVE = 1.600" DIA. C.R. = 6.3
VALVE TIMING I.O. 2°E; I.C. 28°L; E.O. 51°E; E.C. 7°L.
E.D. 20.8.37
  
  


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