<P> A two - stroke diesel engine is a diesel engine that works in two strokes . A diesel engine is an internal combustion engine that operates using the Diesel cycle . Invented in 1892 by German engineer Rudolf Diesel, it was based on the hot - bulb engine design and patented on February 23, 1893 . During the period of 1900 to 1930, four - stroke diesel engines enjoyed a relative dominance in practical diesel applications . Charles F. Kettering and colleagues, working at the various incarnations of Electro - Motive and at the General Motors Research Corporation during the 1930s, advanced the art and science of two - stroke diesel technology to yield engines with much higher power - to - weight ratios than the two - stroke diesels of old . This work was instrumental in bringing about the dieselisation of railroads in the 1940s and 1950s . </P> <P> All diesel engines use compression ignition, a process by which fuel is injected after the air is compressed in the combustion chamber, thereby causing the fuel to self - ignite . By contrast, gasoline engines utilize the Otto cycle, or, more recently, the Atkinson cycle, in which fuel and air are mixed before entering the combustion chamber and then ignited by a spark plug . </P> <P> Two - stroke internal combustion engines are simpler mechanically than four - stroke engines, but more complex in thermodynamic and aerodynamic processes, according to SAE definitions . In a two - stroke engine, the four "cycles" of internal combustion engine theory (intake, compression, ignition, exhaust) occur in one revolution, 360 mechanical degrees, whereas in a four - stroke engine these occur in two complete revolutions, 720 mechanical degrees . In a two - stroke engine, more than one function occurs at any given time during the engine's operation . </P> <Ul> <Li> Intake begins when the piston is near the bottom dead center . Air is admitted to the cylinder through ports in the cylinder wall (there are no intake valves). All two - stroke Diesel engines require artificial aspiration to operate, and will either use a mechanically driven blower or a turbo - compressor to charge the cylinder with air . In the early phase of intake, the air charge is also used to force out any remaining combustion gases from the preceding power stroke, a process referred to as scavenging . </Li> <Li> As the piston rises, the intake charge of air is compressed . Near top dead center, fuel is injected, resulting in combustion due to the charge's extremely high pressure and heat created by compression, which drives the piston downward . As the piston moves downward in the cylinder, it will reach a point where the exhaust port is opened to expel the high - pressure combustion gasses . However, most current two - stroke diesel engines use top - mounted poppet valves and uniflow scavenging . Continued downward movement of the piston will expose the air intake ports in the cylinder wall, and the cycle will start again . </Li> </Ul>

2 stroke diesel engine vs 4 stroke diesel engine
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