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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 showing power variation, B.M.E.P., and fuel consumption against R.P.M. for a Bentley single-cylinder engine test with different choke sizes.

Identifier  ExFiles\Box 134\2\  scan0024
Date  23th April 1957
  
BENTLEY SINGLE CYLINDER TESTS.
SHEET 2
POWER VARIATION WITH CHOKE SIZE (TWIN INLET HIGH POWER HEAD)
HIGH POWER CYL. HEAD TO L.E.C. 4/23/57
TWO INLET VALVES 1.225 DIA
EXHAUST VALVE 1.500 DIA.
COMPRESSION RATIO :- 6.13
OPEN EXHAUST
FUEL = DTD 224
VALVE TIMING
I.O. 2°E
I.C. = 28°L
E.O. 51°E
E.C. = 7°L
34 M/M CHOKE
36 M/M CHOKE
38 M/M CHOKE
40 M/M CHOKE
APPROX. SP.{Mr Spinney} FUEL CONSUMPTION.
(COMMON TO ALL CHOKE SIZES)
Vertical axis left: BRAKE HORSE POWER.
Horizontal axis bottom: R.P.M.
Vertical axis right top: B.M.E.P. (LBS/SQ. IN.)
Vertical axis right bottom: SP.{Mr Spinney} FUEL CONS. (PTS/BHP/HR)
Margin left: V1745.
  
  


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