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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).
Series of graphs showing the effect of water circulation on overheating in a 19 EX car.

Identifier  ExFiles\Box 19\4\  Scan126
Date  2nd July 1930 guessed
  
GRAPH II
EFFECT OF CIRCULATION ON OVERHEATING.
19 EX CAR
GRAPH A:
A BACK PRESS CAUSED BY RESTRICTION 15 LBS/SQ"
WATER OUTLET FROM THE CYL: BLOCK RESTRICTED TO 23-.125 HOLES.
TOP WATER TEMP.
ATS TEMP. 20°C
SHUTTERS OPEN. SHUTTERS CLOSED
STANDARD
RESTRICTED CIRCULATION.
STANDARD
RESTRICTED CIRCULATION.
Y-AXIS: TOP WATER TEMP. C°
X-AXIS: ROAD SPEED 75 M.P.H.

GRAPH B:
CIRCULATION ON PII WATER SYSTEM
RAD: E.79448 6/7 1/2 TUBES.
MEAN BOTTOM WATER TEMP: 67°C
RAD E.79321
TWO RAD OUTLETS
SINGLE RAD OUTLETS.
RESTRICTION OF 23 .125 HOLES IN OUTLET PIPE
65 M.P.H.
Y-AXIS: FLOW GAL/MIN.
X-AXIS: ENGINE R.P.M.

GRAPH C:
CIRCULATION ON PII WATER SYSTEM AT HIGH TEMPERATURES.
DOUBLE RAD: OUTLET
SINGLE RAD: OUTLET
ENGINE R.P.M. 2500
Y-AXIS: CIRCULATION GAL/MIN.
X-AXIS: BOTTOM WATER TEMP. C°

DIAGRAMS:
6 M/M 7.5 M/M TUBES
4.0"
23.6"
26.8"
DOUBLE RADIATOR OUTLET.
  
  


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