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The higher output levels attained by recent automotive engines have been accompanied with an increase in the amount of heat generated by the engine. This higher heat release level, together with the styling trend toward a lower hood line, requires a method for accurately predicting heat release to the engine coolant. In this research, the heat flow path in the engine was separated into several components and equations were formulated for estimating the amount of heat released by each component. The whole heat release to the engine coolant was obtained by totaling the heat release of each component.

The engine cooling system is required to provide much higher performance today owing to the improved power output of engines and the trend toward a more compact engine compartment. For front engine/rear drive vehicles equipped with a fluid coupling drive fan, one of the main problems that must be dealt with is the rise in coolant temperature during idling. This paper presents a new method to simulate the engine coolant temperature under idling condition, and an improved engine cooling system that features a totally redesigned fan blade for maximum efficiency. This new system, consisting of a high performance cooling fan shroud and coupling, achieves a substantial noise reduction and contributes to fuel economy and power output improvements.