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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).
Blueprint with graphs detailing the effect of water circulation on overheating in a PII water system for a 19 Ex. car.

Identifier  ExFiles\Box 24\5\  Scan267
Date  2nd July 1930 guessed
  
GRAPH II
EFFECT OF CIRCULATION ON OVERHEATING
CIRCULATION ON PII WATER SYSTEM
A
19 Ex. CAR
A BACK PRESS CAUSED BY RESTRICTION 15 LBS/SQ.IN.
WATER OUTLET FROM THE CYL. BLOCK RESTRICTED TO 23-.125 HOLES.
TOP WATER TEMP
ATS TEMP. 20°C
TOP WATER TEMP. C°
SHUTTERS OPEN.
SHUTTERS CLOSED
STANDARD
RESTRICTED CIRCULATION.
ROAD SPEED 75 M.P.H.
B
RAD: E.79448 6 7/8 TUBES.
MEAN BOTTOM WATER TEMP. 67°C
RAD E.79321
FLOW GAL/MIN
ENGINE R.P.M.
TWO RAD OUTLETS
SINGLE RAD OUTLETS
RESTRICTION OF 23 .125 HOLES IN OUTLET PIPE.
65 M.P.H.
C
CIRCULATION ON PII WATER SYSTEM AT HIGH TEMPERATURES.
CIRCULATION GAL/MIN
BOTTOM WATER TEMP: C°
DOUBLE RAD OUTLET
SINGLE RAD OUTLET
ENGINE R.P.M 2500
DOUBLE RADIATOR OUTLET.
6 m/m TUBES
7.5 m/m TUBES
4.0''
23.6''
26.8''
  
  


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