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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).
Comparison graph of Indicated Horse Power and Indicated Mean Effective Pressure curves for Lorraine-Dietrich and 20 HP engines.

Identifier  ExFiles\Box 22\4\  Scan106
Date  25th March 1927
  
LORRAINE-DIETRICH & 20 H.P. R.R. COMPARISON.
INDICATED HORSE POWER & INDICATED MEAN EFFECTIVE PRESSURE CURVES.

LEFT Y-AXIS: INDICATED HORSE POWER
RIGHT Y-AXIS: INDICATED MEAN EFFECTIVE PRESSURE (LBS PER SQ.")
X-AXIS: R.P.M. OF ENGINE.

CURVE LABELS:
1. LORRAINE I.H.P. I.M.E.P.
2. 20 H.P. R.R. WITH SAME COMPRESSION RATIO & INDUCTION PIPE DEPRESSION AS THE LORRAINE. (CALCULATED VALUES). I.M.E.P. I.H.P.
3. I.H.P. I.M.E.P. 20 H.P. R.R. WITH SAME COMP. RATIO AS LORRAINE (CALCULATED)
4. STD. 20 H.P. R.R. I.H.P. I.M.E.P.
  
  


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