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 through various Phantom II cylinder heads and an 8 Litre Bentley head.

Identifier  ExFiles\Box 31\2\  Scan118
Date  29th August 1933 guessed
  
PHANTOM
CURVE 6
FLOW THRU PORT CU.FT./MIN
COMPARISON OF VARIOUS PHANTOM II HEADS
& 8 LITRE BENTLEY HEAD
(1) ----- 8 LITRE BENTLEY HEAD (4 VALVES / CYL.)
(2) ----- PH. II HEAD - E.8390G INLET VALVE DIA. - 2.0" (THROAT.)
(3) ----- STD. PH. II HEAD - E.83538 INLET VALVE DIA. 1.9" (THROAT.)
(4) ----- STD. PH. II HEAD - E.83538 INLET VALVE DIA. 1.7" (THROAT.)
NOTE:- ALL CURVES AT FULL LIFT i.e. P.II - .480" BENTLEY - .335"
PRESS. DIFFERENCE ACROSS VALVE - "Hg.
  
  


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