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 airflow versus pressure differential for different engine cylinder heads.

Identifier  ExFiles\Box 31\2\  Scan135
Date  26th September 1938 guessed
  
SHEET 2
COMPARISON OF DIFFERENT HEADS
FLOW
CU.FT./MIN
PRESS. DIFF. ACROSS VALVE - INS. Hg.
8 LITRE BENTLEY HEAD.
ALL TAKEN AT FULL LIFT
PHANTOM + .480
BENTLEY + .585
P.II LARGE VALVE - E 83206
VALVE DIA - 2.00
P.II STD HEAD - E 83538
VALVE DIA - 1.9
P.II HEAD (NON-TURBULENT)
VALVE DIA - 1.73
P.I STD HEAD. SPECIAL SMALL INLET VALVES
VALVE DIA - 1.70
  
  


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