Spark-ignition

Spark-ignition means relating to a gasoline-fueled engine or any other type of engine with a spark plug (or other sparking device) and with operating characteristics significantly similar to the theoretical Otto combustion cycle. Spark-ignition engines usually use a throttle to regulate intake air flow to control power during normal operation.

Source

40 CFR § 91.3

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Scoping language

The following definitions apply to this part 91. All terms not defined herein have the meaning given them in the Act.

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