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spark-ignition (SI) engine
An internal combustion engine in which the fuel mixture is ignited electrically. A spark-ignition engine runs on an Otto cycle — most gasoline engines run on a modified Otto cycle. This cycle uses a homogeneous air-fuel mixture that is combined before it enters the combustion chamber. Once in the combustion chamber, the mixture is compressed, then ignited by a spark plug (spark ignition). The engine is controlled by limiting the amount of air allowed inside through the use of a throttling valve placed on the air intake (carburetor or throttle body).
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- Part of Speech: noun
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- Industry/Domain: Automotive
- Category: Vehicle equipment
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