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).
Various engine cooling methods, including liquid and air cooling.
| Identifier | ExFiles\Box 178\1\ img043 | |
| Date | 15th February 1926 guessed | |
| - 27 - It will be observed that the last four difficulties are susceptible to partial or total elimination by design. The first presents a more obstruse problem. The chief difference between evaporative cooling and cooling under pressure is that the former alters the normal working conditions of the system, the latter is operative only under emergency conditions of overheating. (7) OTHER METHODS OF COOLING. (i) Oil and other liquids. From time to time suggestions have been made as to the desirability of employing some liquid in the radiator having a higher boiling point than water, such as, oil. Enough has already been said on this subject to indicate the difficulties which would be encountered due to detonation, quite apart from the problems of circulation which would arise due to the low specific heat of other fluids compared with water and in the case of oils, their high and varying viscosity. (ii) Air cooling. Air cooling is an established fact on at least one high grade car, notably the Franklin. The benefits gained from air cooling are chiefly with regard to weight. As a large and efficient fan is necessary to draw the air round the cylinders if they are to be in any conventional 'in line' form, this method of cooling is not as simple as one might suppose. Again, the problem of silence has never been satisfactorily solved on an air-cooled engine apart from the noise likely contd. | ||