IN the cooling system for an automobile engine, the water-jacket must be designed to give ample capacity and free flow of the water. It is essential that water-pump capacities and speeds be figured to equal the radiator capacity so as not to retard the flow of water through the radiator and cause hot water to back up into the cylinder; the radiator must always be kept full and still handle the water as fast as the pump carries it. Fan locations are necessarily considered with relation to the radiator and radiator shroud. Fan diameters, blade path and fan speeds should be given thought, in order that the proper volume of air can be handled to carry heat from the engine. The frontal area of the radiator core in square feet per horsepower developed by the engine and several other details which can be worked out by the fan and radiator manufacturers should receive attention.
The best possible fan bearings must be used, giving special attention to radial and thrust loads, fan speeds, etc. Attention should be given to the method of oiling fan bearings, whether of ball, plain or roller type; the hub should be kept tight and free from dust. Strong fan mountings or brackets are desirable to minimize vibration which is always detrimental to all fan parts. In other words, instead of using what space is left on the chassis for fan purposes, far better results will be gained if the foregoing items are given proper attention, thus dissipating the heat produced by the engine in a satisfactory manner. All necessary information on this subject is at present available through the cooperation of car and accessory manufacturers.