The cylinder head is mounted on the cylinder block, sealing the cylinder from the top and forming the combustion chamber. It is often in contact with high-temperature, high-pressure gas, and therefore it is subject to large thermal and mechanical loads. The cooling jacket is formed inside the cylinder head of the water-cooled engine, and the cooling water hole at the lower end face of the cylinder head communicates with the cooling water hole of the cylinder block. Recycled water is used to cool the high temperature parts such as the combustion chamber.


The cylinder head is also equipped with intake and exhaust valve seats, valve guide hole for the installation of intake and exhaust valves, and intake and exhaust passages. The cylinder head of the gasoline engine is machined with holes for spark plugs, while the cylinder heads of diesel engines are machined with holes for injectors. The camshaft bearing holes are also machined on the cylinder head of the overhead camshaft engine to mount the camshaft.

The cylinder head is generally cast from gray cast iron or alloy cast iron. The heat conductivity of the aluminum alloy is good, which helps to improve the compression ratio. Therefore, the aluminum alloy cylinder head has been used more and more in recent years.


The cylinder head is an integral part of the combustion chamber. The shape of the combustion chamber has a great influence on the operation of the engine. Due to the difference in the combustion modes of the gasoline engine and the diesel engine, the parts of the cylinder head that make up the combustion chamber differ greatly. The combustion chamber of the gasoline engine is mainly on the cylinder head, and the combustion chamber of the diesel engine is mainly in the pit on the top of the piston.


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