Spark-ignition engine
Type of internal combustion engine / From Wikipedia, the free encyclopedia
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For details of the spark-ignition system, see Ignition system.
A spark-ignition engine (SI engine) is an internal combustion engine, generally a petrol engine, where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug. This is in contrast to compression-ignition engines, typically diesel engines, where the heat generated from compression together with the injection of fuel is enough to initiate the combustion process, without needing any external spark.