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AIR COOLING.

27th January 1920
Page 31
Page 31, 27th January 1920 — AIR COOLING.
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A Growing Tendency in Engine Design and Its Possible Application to the Commercial Vehicle Power Unit.

IT IS A LONG step from the production of small air-cooled engines for light oars up to the manufacture of air-cooled engines for commercial vehicles of heavier types. Success in the one sphere does not necessarily mean success in. the other.' Nevertheless, it would be rash to predict that the air-cooled engine Will never become common on vehicles of considerable load eapacity. As our readers arc aware, it has, for several years past, been successfully employed as a six-cylinder unit upon a substantial car nianufactured in America.

During the last three or four years, a tremendous amount has been learnt about air-cooling and improved materials have been put into use, the employment of which enables a far higher running temperature to be maintained without risk. In cold climates. air cooling has the great advantage of eliminating possibilities of trouble during frosts. In all climates, a water-circulating system is more or less liable to give trouble. The radiators must be exposed and delicate, and are generally liable to injury. Perhaps the strongest argument against the develenment of air-cooled engines for heavy vehicle power units is that, unless they can be rendered absolutely satisfactory even in the hottest climates and under the severest running conditions, the limited employment would mean the division of output into two distinct types for each load capacity.

Meanwhile, however, it is quite probable that we shall see a natural development from the air-cooled light car to the air-cooled light van of somewhat similar design, and, if the method is thoroughly successful in this sphere, it will eertainly.be more highly tried in the interests of cheap production, the elimination of parts and the reduction of The cost of attending to and overhauling trade vehicles.

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