cylinder head
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~5 min read
Encyclopedic overview
In a piston engine, the cylinder head sits above the cylinders, forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern overhead valve and overhead camshaft engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often coolant passages, valvetrain components, and fuel injectors.
Number of cylinder heads
Excerpted from Wikipedia’s “cylinder head” article, available under the CC BY-SA 4.0 licence.