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).
Engine cooling systems, heat dissipation, and heat generation factors in petrol engines.
| Identifier | ExFiles\Box 178\1\ img019 | |
| Date | 15th February 1926 guessed | |
| - 3 - the liquid surrounds the cylinders, the waste engine heat evaporates it, it is then condensed by passing through some form of radiator and is returned to the cylinder. It should be noted that in every case the ultimate heat dissipating factor is the atmosphere. Now the temperature of the atmosphere varies to the extent of some 70°C at different seasons in different parts of the globe. It is obvious, therefore, that if a car cooling system is designed to function under every climate extreme, it will be far more efficient than is required in 99% of the circumstances under which the car is used. In other words, a mass of weight will be carried about on hundreds of cars consuming tyres, petrol and oil in order to provide for the one occasion when a single owner is ascending a steep hill in the tropics. Most heat dissipating systems therefore are a compromise, which may possibly put the exceptional owner to some little inconvenience such as - replenishing the liquid in his cooling system, but if they enable him to carry on for long distances without reducing his engine power, cannot be considered altogether unsatisfactory in view of consequent benefit conferred upon other owners. (2) HEAT GENERATING FACTORS. (a) Characteristics of 4-cycle petrol engine. If a cooling system is inadequate it will fail when the power unit is doing the maximum amount of work at any given road speed. In considering a petrol engine from the cooling point of view, therefore, it is sufficient if we investigate contd. | ||