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).
Procedure for testing and comparing vehicle radiator performance during a hill climb.
Identifier | ExFiles\Box 178\1\ img045 | |
Date | 15th February 1926 guessed | |
- 29 - hill preferably not less than three miles long - insert through a hole in the radiator cap (or a cork replacing this) one glass thermometer in the top tank of each radiator. Take the atmospheric temperature and bring the top water temp. to within a given number of degrees of this by letting the engine cool and then running it slowly with the radiator blanked off. The object of running the engine slowly is to make certain that the bottom radiator temperature will be approximately the same for each test. When the difference between the top water temperature and air is say 50°C, or whatever is decided upon, the hill should be climbed in a given manner either at a fixed speed or in a way which is suitable for the gradient of the hill, possibly full throttle will be used all the way. The top water temperature every half-mile by speedometer should be taken. The test should be repeated and then carried out on the second car. The rise in temperature relative to the atmosphere of each car should then be plotted, when any difference will at once be detected. This method permits comparisons to be made on different days, but it is always inadvisable to do this in one way tests due to the changing direction of the wind. If it is windy, results taken on different days are not comparable. It will be noted that three people are required for this test. A driver, someone to take speedometer readings, and someone to sit on the wing and read the thermometer in the radiator top tank. Where no hill is available, a level stretch of road should contd. | ||