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 comparing the power performance of Ramp and Standard cylinder heads on a Bentley single-cylinder test engine using normal fuel.

Identifier  ExFiles\Box 133\2\  scan0068
Date  26th July 1934 guessed
  
SHEET 4
V1709.
BENTLEY SINGLE CYLINDER TESTS
POWER COMPARISON OF RAMP & STANDARD CYL. HEADS (NORMAL FUEL)
NATURALLY ASPIRATED
OPEN EXHAUST
FUEL - N°1 SHELL
COMPRESSION RATIO: RAMP: 6.59; STD: 6.40.
VALVE TIMING (.020 CLEARANCE): I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L. (STANDARD BENTLEY).
BRAKE HORSE POWER
B.M.E.P. (LBS./SQ.IN.)
IGNITION ADVANCE
SP.{Mr Spinney} FUEL CONS.
R.P.M.
RAMP
STANDARD
SP.{Mr Spinney} FUEL CONS. (RAMP) (STD.)
MIN. IGNITION ADV. (RAMP) (STD.)
  
  


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