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The sparks plugs fire and ignite the fuel in a Gasoline engine, and compression compresses the fuel until it ignites in a Diesel engine.
The internal combustion engine ignites the fuel. That fuel then expands as it burns into carbon dioxide. Carbo ndioxide is what is left from the burning of fossil fuels.
An SI engine ignites the fuel with a spark (SI = Spark Ignition) whereas the CI engine ignites the fuel with heat generated from compression (CI = compression ignition)
spark plug
When the fuel/air mixture inside the cylinders ignites.
diesal fuel ignites from pressure of the cylinder.gasoline ignites from the ignition spark from the distributor or coil pack.
it gets hot, and ignites the diesel fuel that is injected by the fuel injectors.
All gasoline cars run on both - electricity is required to create the spark which ignites the fuel/air mixture.
When an engine runs as it should the fuel/air mix in the combustion chamber ignites at the spark plug and the flame front spreads from there. In an engine that's knocking there are hotspots in the combustion chamber causing the fuel/air mixture to ignite prematurely a bit all over the place.
The diesel engine, which ignites the fuel vapors by compression within a preheated cylinder.
By creating a spark it ignites the fuel in an engine which explodes causing the cylinder to move.
The fuel ignites under high compression.