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 power and BMEP against RPM for short duration versus normal Bentley valve timings on a single cylinder engine.

Identifier  ExFiles\Box 134\2\  scan0028
Date  23th April 1957 guessed
  
V1749.
BENTLEY SINGLE CYLINDER TESTS
SHEET 6
POWER COMPARISON WITH SHORT DURn & NORMAL TIMINGS
HIGH POWER CYLINDER & HEAD TO LEC 4075
SINGLE INLET VALVE 1.750" DIA
EXHAUST VALVE 1.500" DIA
COMPRESSION RATIO = 6.17
ZENITH CARBURETTOR (36mm CHOKE)
OPEN EXHAUST
FUEL = DTD 224
BRAKE HORSE POWER
B.M.E.P. (LBS/SQ. IN.)
R.P.M.
SHORT DURn TIMING
BENTLEY TIMING
SHORT DURATION VALVE TIMING:
I.O. 2°E; I.C. 28°L; E.O. 51°E; E.C. 7°L.
NORMAL BENTLEY VALVE TIMING:
I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L.
  
  


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