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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 circulation on overheating in a PII water system.

Identifier  ExFiles\Box 29\3\  Scan231
Date  2nd July 1930 guessed
  
GRAPH II
EFFECT OF CIRCULATION ON OVERHEATING

CHART A:
19 EX CAR
A BACK PRESS CAUSED BY RESTRICTION 15 LBS/□"
WATER OUTLET FROM THE CYL: BLOCK RESTRICTED TO 23-.125 HOLES.
TOP WATER TEMP
ATS TEMP 20°C
Y-Axis: TOP WATER TEMP C°
Bars (SHUTTERS OPEN.): STANDARD, RESTRICTED CIRCULATION.
Bars (SHUTTERS CLOSED): STANDARD, RESTRICTED CIRCULATION.
ROAD SPEED 75 M.P.H.

GRAPH B:
CIRCULATION ON PII WATER SYSTEM
RAD: E79448 6/7 1/2 TUBES.
MEAN BOTTOM WATER TEMP 67°C
RAD: E79321
Y-Axis: FLOW GAL/MIN
X-Axis: ENGINE R.P.M.
Line Data: TWO RAD OUTLETS, SINGLE RAD OUTLETS, RESTRICTION OF 23 .125 HOLES IN OUTLET PIPE.
Test Condition: 65 M.P.H.

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

DIAGRAMS:
DOUBLE RADIATOR OUTLET
Radiator core dimensions: 4.0, 6 M/M, 7.5 M/M TUBES, 23.6, 26.8.
  
  


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