Motorcycle air-cooled engine uses natural wind to directly cool the engine for heat dissipation. Motorcycle water-cooled engine uses coolant around the water tank and cylinder, which is exchanged through a water pump to cool the engine. Motorcycle oil-cooled engine is oil-cooled. Use the vehicle’s own oil to dissipate heat through an oil radiator.
What kind of cooling method is used for each motorcycle depends on the design factors of the motorcycle. There is still a gap in the performance of the three cooling methods.
(1) Motorcycle air-cooled engine
Advantages: Zero failure of the cooling system (natural cooling) air-cooled engine has low cost and takes up less space.
Disadvantages: heat dissipation is slow and limited by the type of engine. For example, inline 4 cylinders rarely use air-cooled middle 2 cylinders to dissipate heat effectively, so air cooling is only suitable for 2-cylinder engines.
In fact, air-cooling is cooling by the wind brought by the driving of the vehicle. The air-cooled cylinder tube will be designed with a large heat sink, and the cylinder head will be designed with fan heat fins and air ducts (most of the air-cooled are single cylinders with low speed and high torque. If an air-cooled engine with flawless design runs long distances, there is nothing wrong with it. It’s not said that air-cooled is not suitable for long-distance running. It is said that many Harleys are air-cooled and do not hold the tiles due to high temperature.
Air-cooled is the standard configuration of daily scooters. The heat dissipation system has a zero-fault engine and low cost. As long as it is properly maintained, it will not cause high temperature problems. On the contrary, water-cooled vehicles have more high temperatures. In short, a single-cylinder low-speed car air cooling is completely sufficient, so there is no need to worry about long-distance issues.
(2) Motorcycle water-cooled engine
Advantages: It can effectively control the temperature of high-power and high-speed engines. When the temperature is low, the throttle valve will be closed until the oil temperature rises to achieve the best lubrication effect. When the temperature is high, the throttle valve will be closed. Turn on the water tank and start working. When the temperature is too high, the fan turns on and cools down to the best working temperature of the engine. This is the standard water cooling working principle.
Disadvantages: high cost, complex structure, high failure rate, because the external water tank takes up a lot of space.
Motorcycle water-cooled engine is a cooling method with better heat dissipation effect. The principle of water cooling is to cool the cylinder liner and cylinder head by flowing water. The basic accessories of water cooling are water pump, water tank temperature control and fan.
Water cooling is a necessary heat dissipation system for multi-cylinder, high-power and high-speed engines (as well as water and oil double cooling). The small displacement 125 single-cylinder car basically does not need water cooling. Generally, the 125 does not generate so much heat. But now the water cooling system is being quantified in small rows, and many motorcycles with 150CC are already equipped with water cooling systems.
(3) Motorcycle oil-cooled engine
Advantages: the heat dissipation effect is obvious, the failure rate is low, and the low oil temperature can reduce the viscosity of the oil at high temperature.
Disadvantages: There are restrictions on the amount of engine oil required. The oil radiator cannot be too large. If it is too large, the oil will flood into the oil radiator and cause insufficient lubrication at the bottom of the engine.
Oil cooling is oil cooling that uses the vehicle’s own oil to dissipate heat through an oil radiator (the oil radiator and the water tank are basically the same principle, but one is oil and the other is water), because the circulation power of oil cooling comes from The engine oil pump, so oil cooling only needs an oil fan heater (oil tank), high-end oil cooling will be equipped with a fan and a throttle valve.
The oil cooling system is generally equipped for mid-end street cars. The pursuit is stability and fan heating effect. Single-cylinder air-cooled cars are more suitable for oil cooling. Single-cylinder air-cooled cars only need to add oil in the middle of the oil passage. Fan heater is enough.
How to distinguish oil cooling or water cooling?
First of all, the heat sink of the oil-cooled radiator is very thick, and the heat sink of the water-cooled radiator is very thin. Oil-cooled radiators are generally small in size, while water-cooled radiators are relatively large. If your car has two radiators, look at the larger one is the water-cooled radiator.
There is another very important distinction above. Most of the water-cooled radiators have electronic fans behind them, but oil-cooled radiators basically do not. (However, some two-stroke cars do not use electronic fans in the water tank radiator).
What are the advantages and disadvantages of oil-cooled cars and water-cooled cars?
Oil-cooled car: It is equipped with a radiator similar to the heat dissipation water tank of a water-cooled car. The engine oil in the engine is circulated to reduce the temperature. Compared with the water-cooled car, its structure is also much simpler, because the oil used to lubricate the engine parts Direct cooling, heat dissipation effect is also better, better than air-cooled models, but not as good as water-cooled cars.
Water-cooled car: The structure is complex, the cylinder block, cylinder head and even the engine box have to be redesigned (compared to the same air-cooled car). Special water pumps, water tanks, fans, water pipes, temperature switches, etc. are required. The cost is the highest and the volume is also high. It’s bigger, but it has the best cooling effect and the cooling is even.
Should oil-cooled cars be protected against freezing night?
Everyone knows that ordinary water-cooled radiators need to add antifreeze, so do oil-cooled cars need it?
Of course, there is no need to add it. Since it is oil-cooled, it means that the cooling liquid in the engine is oil, not water. So there is no need to add water. But some cars use both oil and water cooling. In that case, you should not be fooled by the oil-cooled radiator. You have to see if there is a water tank radiator. If there is, you must add antifreeze.