Rolls-Royce Archives
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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 the air-flow of various Bentley cylinder heads.

Identifier  ExFiles\Box 31\2\  Scan142
Date  6th December 1933 guessed
  
COMPARISON OF VARIOUS BENTLEY
CYLINDER HEADS BY AIR-FLOW TESTS.
FLOW. CU.FT/MIN.
PRESS. DIFF. ACROSS VALVE - INS. HG
ER.1237 ALUM. HEAD
STREAMLINED PORT INLET
TURBULENCE REMOVED.
STD. WOODEN MODEL.
(1.5" VALVE)
(1.4" VALVE)
(CAST IRON)
LARGE INLET BENTLEY HEAD-E.B.61B
E.B.1237-STREAMLINED PORT ETC
E.B.1237-ALUM. HEAD.
STD. CAST IRON
HEAD - E.B.615
(1.5" VALVE)
(1.5" VALVE)
(1.4" VALVE)
ALL CURVES
AT 0.400" LIFT
  
  


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