A four-stroke engine (also known as four cycle) is an internal combustion (IC) engine in which the piston completes four separate strokes while turning a crankshaft.
A two-stroke, or two-cycle, engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution.
The Pyréolophore was probably the world's first internal combustion engine
Unit injector (UI) is an integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component.
Common rail direct fuel injection is a direct fuel injection system for petrol and diesel engines.
Indirect injection in an internal combustion engine is fuel injection where fuel is not directly injected into the combustion chamber.
A free-piston engine is a linear, 'crankless' internal combustion engine
Diesel engines began to be used in automobiles in the 1930s.
The diesel engine (correctly known as a compression-ignition or CI engine) is an internal combustion engine in which ignition of the fuel that has been injected into the combustion chamber