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Engine Cylinder Block,Cylinder Head Gasket,Main Bearing
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Cylinder Head (143)

In an internal combustion engine, the cylinder head  sits above the cylinders on top of the cylinder block. It closes in the top of the cylinder, forming the combustion chamber. This joint is sealed by a head gasket. In most engines, the head also provides space for the passages that feed air and fuel to the cylinder, and that allow the exhaust to escape. The head can also be a place to mount the valves, spark plugs, and fuel injectors.

The number of cylinder heads in an engine is a function of the engine configuration. Almost all inline (straight) engines today use a single cylinder head that serves all the cylinders.  Some engines, particularly medium- and large-capacity diesel engines built for industrial, marine, power generation, and heavy traction purposes (large trucks, locomotives, heavy equipment etc) have individual cylinder heads for each cylinder. This reduces repair costs as a single failed head on a single cylinder can be changed instead of a larger, much more expensive unit fitting all the cylinders.

The design of the cylinder head is key to the performance and efficiency of the internal combustion engine, as the shape of the combustion chamber, inlet passages and ports  determines a major portion of the volumetric efficiency and compression ratio of the engine.

Cylinder block come from casting, the generally used material is  gray cast iron or  alloy cast iron, aluminum alloy has good heat-conducting property  which can help to improve the compression ratio, so in recent years aluminum alloy cylinder head is more widespread.

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