2沖程同埋4沖程點分架 同埋有D咩分別

沖程 = Stroke. Basically describing the times the piston of the internal combustion engine has to move in order to complete the whole process (Intake, compression, power, exhaust). The difference between the two is that a 4-stroke engine will use the same chamber/space for all four activities, while a 2-stroke engine has space under the piston for the intake and compression part, while using the upper chamber for power and exhaust. As you can picture, for a 2-stroke engine there will be power stroke for every revolution of the crank, while for a 4-stroke engine the power stroke happens every other revolution. You will see 2-stroke cycle in smaller application like motorcycle or portable application like lawn mower, boat motor, etc. Most car engines nowadays use four-stroke cycle.