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).
Road test results for engine cooling performance with varying radiator release valve pressure settings.

Identifier  ExFiles\Box 24\4\  Scan106
Date  12th July 1923
  
R.R. 493A (40 H) (SL 42 12-7-23) J.H., D.{John DeLooze - Company Secretary}
-3-
Expl. No.
REF:
EXPERIMENTAL REPORT.
ROAD TESTS.
Taken on 49-GB - standard engine - 4 to 1 compression ratio. - Standard fan and radiator.
Tests taken on hill - leading from Glossop to Chapel-en-le-Frith.
Car speed and load conditions kept the same for each test. Atmospheric temperature remained constant to within 2 degrees.
Release valve set at,-
Conditions - | Standard. | 2 lbs. | 3 lbs. | 4 lbs. | 5 lbs.
Time before water commences to boil. | 3 min. 8 | 4 min. 12 | 5 min. 52 | 6 min. 13
| 3 min. 2 | 4 " 30 | 5 " 58 | 6 " 55
Amount of water lost on hill. Total time 7 mins. 15 secs. | 3.5 pts. | 2.9 pts. | 1.9 pts. | .125 pts.
| 3.9 " | 3.1 " | 2.3 " | .3 "
  
  


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