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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).
Indicator diagram for a 40/50 HP engine, detailing performance data and valve timing.

Identifier  Morton\M7\  img060
Date  24th June 1913 guessed
  
40/50 INDICATOR DIAGRAM

Data Table:
40/50 110° CAMSHAFT
COMPRESSION RATIO 3.9-1
2,000 R.P.M. 77.1 H.P.
13° C AIR TEMP 763 m/m BAR.
COOLING WATER 80°C
I.M.E.P. 81 LBS/SQ"
B.M.E.P. 67.4 LBS/SQ"
MECHANICAL EFFICIENCY 74%
INDICATED VOL. EFF. 84.7%
COMPRESSION PRESSURE. 73.1 LBS/SQ"
EXPLOSION PRESSURE. 312 LBS/SQ"

Valve Timing Diagram:
TDC (Top Dead Center)
EC. 10 (Exhaust Close)
IO. 5 (Inlet Open)
227°
EO. 47° (Exhaust Open)
IC. 29° (Inlet Close)
202°
BDC (Bottom Dead Center)

Graph Labels:
ATS
I.O. (Inlet Open)
E.C. (Exhaust Close)
E.O. (Exhaust Open)
I.C. (Inlet Close)

Vertical Axis (Pressure LBS/SQ"): 350, 300, 250, 200, 150, 100, 50, 0, +10
Horizontal Axis (Crank Angle Degrees): 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180

Partially visible text on left margin: ERE
  
  


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