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).
Methods for comparing the relative efficiency of car cooling systems.
| Identifier | ExFiles\Box 178\1\ img044 | |
| Date | 15th February 1926 guessed | |
| - 28 - to be made by the fan, partially owing to the large expansions which take place owing to the wide range of working temperature of the cylinders making such things as small tappet clearances impossible, and partially owing to the fact that a water jacket is a very effective blanket for sound. Therefore for high grade luxury automobiles there is very sound reason why air cooling has not been more widely adopted. (8) METHODS OF COMPARING CAR COOLING SYSTEMS. (i) Simple tests for relative efficiency. The only real fact which is of interest to Depots, as opposed to the Works where a car is manufactured, is whether the cooling system of a car conforms with standard performance. It is quite useless to compare any two cooling systems unless:- (a) The engines of both cars are in every way giving similar results with regard to efficiency. (b) The engines during the test are given the same amount of work to do i.e. the cars are the same weight. (c) The atmospheric conditions are in every case taken into account. (d) Instruments giving a scientific degree of accuracy are used; these instruments having been previously checked against some common standard. Assuming that ordinary glass thermometers reading from 0 - 100°C only are available, the following is an outline for a useful comparative test. Two cars should be employed, one being selected as standard to be compared with the suspected over-heater. Load both the cars to the same weight. Take the cars to the foot of some contd. | ||