the fuel is evenly mixed with air throughout the combustion chamber, similar to manifold injection.
* In stratified charge mode, there is a zone with a higher fuel density around the spark plug and a leaner mixture (lower fuel density) further away from the spark plug.

Homogeneous charge mode

In the homogeneous charge mode, the engine operates on a homogeneous air-fuel mixture (), meaning that there is an (almost) perfect mixture of fuel and air in the cylinder. The fuel

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