Source: wikibot/spark-ignition-engine
= Spark-ignition engine
{wiki=Spark-ignition_engine}
A spark-ignition (SI) engine is a type of internal combustion engine that uses a spark plug to ignite a fuel-air mixture. This type of engine is typically found in gasoline-powered vehicles. Here are some key characteristics and components of spark-ignition engines: 1. **Fuel Type**: SI engines primarily run on gasoline, which is a volatile liquid that vaporizes easily and mixes with air.