Internal combustion engine

Internal combustion engine means a device in which air enters a combustion chamber, is mixed with fuel, compressed in the chamber, and combusted. Fuel may enter the combustion chamber with the air or be injected into the combustion chamber. Expansion of the hot combustion gases in the chamber rotates a shaft, either through a reciprocating or rotary action. For purposes of this subpart, this definition does not include combustion turbine engines.

Source

40 CFR § 63.9375

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Scoping language

Terms used in this subpart are defined in the CAA; in 40 CFR 63.2, and in this section:

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