What is the difference between an internal combustion engine and an external combustion engine?

The following is about the difference between internal combustion engine and external combustion engine: 1, fuel difference: The biggest difference between internal combustion engine and external combustion engine is that its fuel burns inside, while the fuel of external combustion engine burns outside. The steam engine is called an external combustion engine because the combustion process is carried out outside the cylinder. There are many kinds of internal combustion engines. Common gasoline engines and diesel engines are typical internal combustion engines. 2. Ignition mode: Internal combustion engines are divided into compression ignition type and ignition type. For example, a gasoline engine is an ignition type and a diesel engine is a compression ignition type. External combustion engines can only ignite.