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 for an Aluminium Phantom engine with different valve sizes.

Identifier  ExFiles\Box 17\6\  Scan015
Date  2nd December 1926 guessed
  
SHEET 3.
BRAKE HORSE POWER
.B.M.E.P (LBS. PER SQ. IN.)
R.P.M. OF ENGINE.
LARGE VALVES. B.H.P.
B.M.E.P.
SMALL VALVES. B.H.P.
B.M.E.P.
ALUM. PHANTOM POWER COMPARISON
FOR 1.600 DIA & 1.750 DIA VALVES.
COMP: RATIO = 4.89 : 1
Corrected N.T.P.
  
  


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