Gasoline Engine, based on gasoline as a fuel engine. As the gas viscosity is small, fast evaporation, fuel injection system can be sprayed into the gas cylinder, compressed to a certain temperature and pressure, the spark plug ignited, the gas expansion work done.
　　Gasoline Engine of the gasoline engine is characterized by a high speed, simple structure, light weight, low cost, stable operation, easy maintenance. Gasoline in the car, especially on the extensive use of small cars, has not changed.
　　As the gas viscosity is small, fast evaporation, and the air outside the cylinder can form a uniform mixture, and then the mixture sucked into the cylinder, fuel injection system or fuel injected into the cylinder, the gas expansion work done. From the beginning of 1886 the first car, the gasoline engine in the car, especially on the extensive use of small cars, has not changed.
　　Gasoline Engine gasoline engine thermal efficiency is lower than the disadvantage of diesel engines, fuel consumption higher than the engine ignition system complexity, reliability and ease of maintenance is not as diesel engines.
　　A working cycle includes four piston stroke (so-called piston stroke means the piston from the TDC to BDC the distance between the process): the intake stroke, compression stroke, expansion stroke (power stroke) and the exhaust stroke.