| Two stroke engine | Four stroke engine |
Numbers of strokes | The cycle is completed in one complete revolution (180°) of crankshaft or two strokes of a piston. There is one power stroke in each revolution of the crankshaft. | The cycle is completed in two complete revolutions (360°) of crankshaft or four strokes of a piston. There is one power stroke in two revolutions of the crank shaft. |
Size | Light and compact | Heavier and bulkier |
Inlet and outlet system | Ports are used | Intake and exhaust valves are used |
Flywheel | There is a uniform Turning moment diagram so lighter flywheel is used | Turning moment diagram is no so uniform so heavier flywheel is used. |
Volumetric efficiency | Lower (less time for induction of charge) | Higher (more time for induction of charge) |
Thermal efficiency | Lower | Higher |
Use | Scooters, motorcycles etc | Buses, trucks, aeroplanes etc. |
Comparison of two and four stroke engines
Category: Automobile Engineering
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