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The Difference Between Oil Cooling And Water Cooling In Motorcycles

Mar. 14, 2019

Here is Cnc Parts Processing Exporter talking about the difference between oil cooling and water cooling in motorcycles. 

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Oil-cooled heat-dissipating, the oil-cooled car uses the engine oil inside the engine, is connected to the outside of the engine through the pipeline, and then flows back to the engine through the oil-cooled radiator, and the process is driven by the engine oil pump inside the engine. This design is simpler than a water-cooled engine and does not require the design of a water jacket.

This design is relatively backward compared to water cooling, and the heat dissipation capacity is worse than water cooling. But oil cooling also has its advantages, that is, there is no need to design complex water jackets, and there are no redundant pumps / thermostats / fans, etc., which are lighter in weight. There is no need to add water separately in the usual maintenance, and there is no need to worry about the problem of freezing in winter.

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Many friends are now using oil-cooled design in their modification. That is to add oil and cold on the basis of water cooling, buy or make a special small oil-cooled radiator, add it to the outside of the engine, and further cool the engine, which has achieved good results.

 As the name implies, water cooling is the use of water to cool the engine. This is a relatively common design and has been widely applied to automobiles/motorcycles. The principle of water cooling is to design a water jacket around the engine cylinder. The water is driven by the water pump to dissipate heat to the radiator of the water tank. The cooled liquid flows back to the water jacket to reduce the temperature around the cylinder.

On the way to the tank, the liquid will pass through the thermostat. Thermostats are also a design for adjusting engine temperature. There is a paraffin-controlled valve inside the thermostat. Usually the valve is closed and there is only a small eye next to the valve through the liquid. Therefore, after the engine is started, the speed of the water circulation is very slow, and it is limited by this small eye.

This design allows the engine to heat up quickly, effectively preheating the engine in a short period of time. When the engine temperature reaches a certain limit, the paraffin inside the thermostat will change with temperature and the valve will open. In this case, the speed of the water circulation can be increased immediately, and the temperature of the water will gradually drop to ensure the normal operation of the engine.

When the vehicle is driven for a long time, the temperature of the water will gradually increase to a certain standard (the design standards of different manufacturers are different), which will transmit the signal to the corresponding control device, such as an electronic fan, through the hydrological sensor. The electronic fan is automatically opened by the control of the water temperature sensor to further dissipate the water tank.

Similarly, as the water temperature decreases, the electronic fan will automatically turn off to save energy. Of course, there is still the possibility that the water temperature will not fall and continue to rise. Generally, high speed but low-speed driving is likely to cause such a situation. In order to solve such problems, a sub tank (standby kettle) was also designed.

The principle is as follows: When the engine temperature continues to increase, the temperature of the water will slowly exceed 100 degrees or even higher, so that the water will start to boil and will try to flush out of the tank. The tank cover is then designed to allow boiling water to flow out of the radiator. The underside of the tank lid is designed with a spring-controlled rubber cover to seal the tank.

The usual water tank is in a completely closed state, and it will not leak out at all. The top of the rubber cover is yellow, and the pressure of the rubber cover is used to seal the water tank. Above the rubber cover, there is also a line leading to the sub tank. When the temperature exceeds the limit and the pressure of the water is greater than the pressure of the spring, the rubber cover opens and the boiling liquid flows out to the auxiliary tank.

Of course, no one will always flow out, and the flow will be almost the same (the pressure is reduced) and the lid will be closed. When the water temperature is lowered, the pressure inside the water tank will form a negative pressure, resulting in a state of water shortage. This means that the storage liquid in the sub tank will flow back to the radiator.

This is the basic principle of water cooling. Therefore, the water cooling effect is good, but the attachment is too much, and it takes up space and weight. But with the space available in the frame, more companies have chosen water cooling.

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