The motorcycle Piston Kit manufacturer tells you that the piston can be divided into three parts: the piston top, the piston head, and the piston skirt.The motorcycle Piston Kit manufacturer tells you that the piston head is the part above the piston pin seat, and the piston head is equipped with a piston ring to prevent high temperature and high-pressure gas from entering the crankcase and prevent oil from entering the combustion chamber; Most of the heat is also transferred to the cylinder through the piston head, and then through the cooling medium.

The motorcycle Piston Kit manufacturer tells you that the piston head is machined with several ring grooves for installing piston rings. The number of piston rings depends on the requirements of the seal, which is related to the engine speed and cylinder pressure. The number of rings of a high-speed engine is less than that of a low-speed engine, and the number of rings of a gasoline engine is less than that of a diesel engine.
The motorcycle Piston Kit manufacturer tells you that general gasoline engines use 2 air rings and 1 oil ring; diesel engines use 3 air rings and 1 oil ring; low-speed diesel engines use 3 to 4 air rings. In order to reduce friction loss, the height of the ring belt should be reduced as much as possible, and the number of rings should be reduced under the condition of ensuring sealing.
The motorcycle Piston Kit manufacturer tells you that everything below the piston ring groove is called the piston skirt. Its function is to guide the piston to reciprocate in the cylinder and to withstand side pressure. When the engine is working, the piston will be bent and deformed due to the action of the gas pressure in the cylinder. After the piston is heated, the amount of expansion of the piston pin is larger than that of other places due to the large amount of metal at the piston pin.
The motorcycle Piston Kit manufacturer tells you that, in addition, the piston will experience squeezing deformation under side pressure. The combined result of the above deformation makes the section of the piston skirt become an ellipse whose major axis is in the direction of the piston pin. In addition, due to the uneven distribution of temperature and mass along the axis of the piston, the thermal expansion of each section is large at the top and small at the bottom.
The above information is the motorcycle Piston Kit manufacturer's introduction and analysis of the structure of the piston kit, hope it helps you.