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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 curves at constant detonation for different cylinder heads using a paraffin-shell fuel mixture.

Identifier  ExFiles\Box 134\1\  scan0054
Date  13th December 1937
  
-3-
III. DETONATION
A comparison of power curves run on a paraffin-shell mixture is shown on Fig.III.

HIGH POWER HEAD FIG III
POWER COMPARISON AT CONSTANT DETONATION
FUEL - 50/50 SHELL NO I / PARAFFIN
B.M.E.P
MAIN ENGINE B.H.P
RPM
STANDARD BENTLEY
① NO 4 HEAD - FULLY INCLINED INLET VALVE (1.750" DIAM) CR{Mr Cra???ster / Mr Chichester} - 6.3
② NO 5 HEAD - SEMI - INCLINED INLET VALVE (1.750" DIAM) CR{Mr Cra???ster / Mr Chichester} - 6.3
VALVE TIMING - I.O. T.D.C. I.C. 30°L; E.O. 35°E.{Mr Elliott - Chief Engineer} E.C. T.D.C.
  
  


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