Differences Between Four-Stroke and Two-Stroke Engines
Four-Stroke Engine
Two-Stroke Engine
| Feature | Four-Stroke Engine | Two-Stroke Engine |
|---|---|---|
| Power Stroke | One power stroke per two crankshaft revolutions | One power stroke per crankshaft revolution |
| Flywheel and Balance | Requires heavier flywheel; less balanced | Requires lighter flywheel; more balanced |
| Engine Weight | Heavier engine | Lighter engine |
| Design Complexity | More complex due to valves | Simpler, no valves (uses ports) |
| Cost | Higher cost | Lower cost |
| Efficiency | Less mechanical efficiency due to more friction | Higher mechanical efficiency, fewer moving parts |
| Lubrication System | Complicated system; consumes less oil | Simple system; consumes more oil |
| Usage | Used in cars, buses, and trucks | Used in mopeds, scooters, and motorcycles |