Diesel - Engine

The gasoline-engine (Otto-engine) wasn't very efficient, that is why 1892 Rudolf Diesel had developed the engine with great efficiency named after him.

It is like the Otto-engine a 4-stroke engine. The main differences are:

1st stroke (Intake): Only air is sucked in. 2nd stroke (Compression): The air is powerfully compressed. 3rd stroke (Combustion): Diesel is directly injected into the compressed air and ignites spontaneously. 4th stroke (Exhaust): Like the Otto-engine.