Combustion Chamber – Car Terms

Combustion Chamber: The space within the cylinder when the piston is at the top of its travel. It is formed by the top of the piston and a cavity in the cylinder head. Since most of the air-fuel mixture’s combustion takes place in this space, its design and shape can greatly affect the power, fuel efficiency, and emissions of the engine. (source: caranddriver.com )

Another definition:
Combustion Chamber : The space within the cylinder when the piston is at the top of its travel. It is formed by the top of the piston and a cavity in the cylinder head. Since most of the air-fuel mixture’s combustion takes place in this space, its design and shape can greatly (Car and Driver’s Glossary of Car Terms)

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