![]() ![]() The piston pushes the remaining exhaust gases out of the cylinder. Exhaust Stroke: As the piston moves back up, the exhaust valve opens, allowing the burned gases to exit the cylinder. This combustion causes a rapid expansion of gases, forcing the piston downward with significant power.ĭ. Combustion Stroke: When the piston reaches the top, a spark plug ignites the compressed fuel-air mixture. Both the intake and exhaust valves remain closed during this stroke.Ĭ. Compression Stroke: The piston moves upward, compressing the fuel-air mixture. The intake valve opens, allowing a mixture of fuel and air to be drawn into the cylinder.ī. Intake Stroke: The piston moves downward, creating a vacuum in the cylinder. In a 4-stroke engine, the power cycle consists of four strokes: intake, compression, combustion, and exhaust. A stroke refers to the movement of the piston inside the engine cylinder. The main difference between a 4-stroke engine and a 2-stroke engine lies in the number of strokes required to complete a full power cycle. These basic cycles are fairly standard for all engines. Most internal combustion engines, both with spark ignition and compression ignition, operate on either a four stroke cycle or a two stroke cycle. What is the difference between a 2-stroke and a 4-stroke engine?
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