What are the two common cooling methods for automobile engines?

The two most common cooling methods of automobile engines are air cooling and water cooling.

The air-cooled engine relies on the heat sink outside the cylinder block to conduct the heat of the engine, and then it is cooled by a high-speed and large-flow fan. The basic principle can be described as "cooling the engine with high-speed airflow".

Because of its simple structure, the air-cooled engine has no problems such as coolant leakage and thermostat failure, and its reliability is better. In the past, the diesel engines of "Taituo" trucks were all air-cooled. Germany "Deutz" brand also has many air-cooled diesel engine products.

However, the air-cooled engine has less heat dissipation and is not suitable for tropical areas.

Water-cooled engine is a kind of cooling method that relies on liquid cooling medium to transfer the heat of cylinder to the outside of the engine, and then relies on cooling fan for cooling. It is the most conventional engine cooling method at present.

Good cooling effect and no fear of thermal environment are its greatest advantages, so it is widely used. But the structure is complex, and the failure probability is higher than that of air-cooled engine.