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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 of Mechanical Efficiency and Compression Pressure curves for a Lorraine-Dietrich engine, compared with a 20 HP R.R. engine.

Identifier  ExFiles\Box 22\4\  Scan100
Date  21th March 1927
  

LORRAINE - DIETRICH ENGINE.
21-3-27
MECHANICAL EFFICIENCY & COMPRESSION
PRESSURE CURVES. (RATIO = 5.9 : 1).
COMPRESSION PRESSURE (lbs / sq")
PERCENTAGE MECHANICAL EFFICIENCY.
R.P.M. OF ENGINE.
COMP. PRESSURES.
MECH. EFFICIENCY
LORRAINE.
20 H.P. R.R.
20 H.P. R.R. COMP. PRESSURES
(RATIO = 4.75 TO 1)
  
  


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