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Two stroke engine
• It has one power stroke for each revolution of the crankshaft.
• Lighter flywheel is required and engine runs balanced because turning moment is more even due to one power stroke for each revolution of the crankshaft.
• Engine is light
• Engine design is simple due to absence of valve mechanism.
• Less cost than 4 stroke.
• More mechanical efficiency due to less friction on a few parts.
• Less output due to mixing of fresh charge with the hot burnt gases.
• Engine runs hotter.Difference 2 Stroke and 4 Stroke Engines
• Engine is air cooled.
• More fuel consumption and fresh charge is mixed with exhaust gases.
• Engine requires less space.
• Simple lubricating system.
• More noise is created by engine.
• Engine consists of inlet and exhaust ports.
• Less thermal efficiency.
• It consumes more lubricating oil.
• More wear and tear of moving parts.
• Used in mopeds, scooters, motorcyclesetc.
Four stroke engine
- It has one power stroke for every two revolutions of the crankshaft.
- Heavy flywheel is required and engine runs unbalanced because turning moment on the crankshaft is not even due to one power stroke for every two revolutions of the crankshaft.
- Engine is heavy
- Engine design is complicated due to valve mechanism.
- More cost.
- Less mechanical efficiency due to more friction on many parts.
- More output due to full fresh charge intake and full burnt gases exhaust.
- Engine runs cooler.
- Engine is water cooled.
- Less fuel consumption and complete burning of fuel.
- Engine requires more space.
- Complicated lubricating system.
- Less noise is created by engine.
- Engine consists of inlet and exhaust valve.
- More thermal efficiency.
- It consumes less lubricating oil.
- Less wear and tear of moving parts.
- Used in cars, buses, trucks etc.
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