The function of the cylinder liner is to ensure good sealing between the cylinder block and the cylinder head, thereby ensuring the sealing of the combustion chamber and preventing cylinder air leakage and water jacket water leakage.

Cylinder head material Due to its complex shape, the cylinder head is generally made of gray cast iron or alloy cast iron. Some gasoline engine cylinder heads are also made of aluminum alloy. Compared with cast iron cylinder heads, aluminum alloy cylinder heads have the advantage of good thermal conductivity, which is beneficial to increasing the compression ratio and improving engine efficiency. In addition, aluminum alloy has an outstanding advantage compared with cast iron, which is its light weight, which is in line with the development direction of lightweight vehicle design.

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