The operating cycle of a 2-stroke petrol engine can be described in four strokes:
1. Intake Stroke: The piston moves downward, creating a vacuum that draws a mixture of fuel and air into the cylinder through the intake port.
2. Compression Stroke: The piston moves upward, compressing the fuel-air mixture in the cylinder.
3. Power Stroke: At the end of the compression stroke, the spark plug generates a spark that ignites the fuel-air mixture. The resulting explosion forces the piston downward, generating power.
4. Exhaust Stroke: As the piston moves down during the power stroke, the exhaust port opens and the exhaust gases are expelled from the cylinder.
The 2-stroke petrol engine completes these four strokes in one complete revolution of the crankshaft. This is in contrast to the 4-stroke engine, which takes two complete revolutions of the crankshaft to complete its operating cycle.
