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).
Performance graph comparing standard vs. larger valves on a 20 HP engine.

Identifier  ExFiles\Box 19\7\  Scan108
Date  31th March 1927
  
20 H.P. POWER INCREASE DUE TO LARGER VALVES AND LOWER DEPRESSION IN THE INDUCTION PIPE.
ENGINE No 11-GII
COMPRESSION RATIO = 5.45 to 1.
OPEN EXHAUST.
CORRECTED TO N.T.P.
31-3-27
BRAKE HORSE POWER
BRAKE MEAN EFFECTIVE PRESSURE (LBS / SQ")
R.P.M OF ENGINE.
B.H.P.
B.M.E.P.
LARGE VALVES (1.400 DIA) AND TWO ZENITH TRIPLE VENTURI HORIZONTAL CARBURRETORS.
B.H.P.
B.M.E.P.
STANDARD VALVES (1.200 DIA) AND R.R. CARBURRETTOR.
3
  
  


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