How many revolutions does a four stroke engine complete with a working cycle crankshaft?

Rotate two turns, intake stroke.

Piston from top dead center to bottom dead center, crankshaft.

Rotate 180°, the compression stroke piston from bottom dead center to top dead center, the crankshaft rotates another 180°, and the remaining two strokes rotate 180° each, for a total of 720°

Four-stroke gasoline engine.

The working cycle consists of 4 piston strokes, i.e. intake stroke, compression stroke, work stroke and exhaust stroke.

Four-stroke engines belong to reciprocating piston internal combustion engines, which are divided into three categories: gasoline engines, diesel engines and gaseous fuel engines according to the different types of fuels used. A piston internal combustion engine fueled by gasoline or diesel is called a gasoline engine or a diesel engine, respectively. Use of natural gas, liquefied petroleum gas.

Piston internal combustion engines and other gaseous fuels are called gaseous fuel engines. Gasoline and diesel are both petroleum products and are automobile engines.

traditional fuels. Non-petroleum fuels are referred to as alternative fuels. Engines that burn alternative fuels are called alternative fuel engines, such as ethanol engines, hydrogen engines, and methanol.

engines, etc. The gasoline engine is to mix air and gasoline into a good mixture in a certain proportion, which is sucked into the cylinder in the intake stroke, and the mixture is burned by compression ignition to produce heat energy, and the gas of high temperature and high pressure acts on the top of the piston to promote the piston to reciprocate linear motion, and outputs mechanical energy through the connecting rod and crankshaft flywheel mechanism.

The four-stroke gasoline engine completes a working cycle in the intake stroke, compression stroke, power stroke and exhaust stroke.

Four-stroke diesel engines, like gasoline engines, each working cycle is also composed of intake stroke, compression stroke, power stroke and exhaust stroke. Because the diesel engine uses diesel as fuel, compared with gasoline, the spontaneous combustion temperature of diesel fuel is low, the viscosity is large and it is not easy to evaporate, so the diesel engine adopts spontaneous combustion at the end of compression, and its working process and system structure are different from those of gasoline engine.

The working process of the engine is divided into four processes: air intake, compression, work and exhaust. The four-stroke engine accomplishes these four processes in four strokes of the piston moving up and down. Intake stroke:

The intake valves are open and the exhaust valves are closed. As the piston moves from top dead center to bottom dead center, the volume above the piston increases, and the pressure in the cylinder decreases, resulting in vacuum suction. Suck the gas mixture into the cylinder.

Compression stroke: The intake and exhaust valves are closed, and the piston moves from the bottom dead center to the top dead center to press the mixed gas to the combustion chamber. Work Itinerary:

At the end of compression, the intake and exhaust valves are still closed, and the spark plug emits an electric spark to ignite the combustible mixture, and the gas after combustion expands violently, generating a huge pressure, forcing the piston to go down rapidly, and the crankshaft is rotated through the connecting rod. Exhaust stroke: The exhaust valve opens, the intake valve closes, and the piston moves from the bottom dead center to the top dead center to expel the exhaust gas.