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Comparison between Four stroke and two stroke engines

Comparison between Four stroke and two stroke engines










Four stroke engine

Two stroke engine

1.One working stroke for every two revolution of crank shaft

1.One working stroke for each revolution of the crankshaft

2.Turning moment on the crankshaft is not due to one working stroke for every two revolution of the crankshaft Hence heavy flywheel is required & Engine runs unbalanced.

2.Turning moment of the crankshaft is more even due to one working stroke for each revolution of the crankshaft Hence lighter flywheel is required and engine runs balanced.

3. Engine is heavy .

3. Engine is light.

4.Emgine design is complicated.

4.Engine design is simple.

5.More cost .

5.Less cost .

6.less mechanical efficiency due to more friction on many parts.

6.More mechanical efficiency due to less friction on a few parts.

7.More output due to  full fresh charge intake and full burnt gases exhaust.

7.less output due to mixing of fresh charge with burnt gases.

8.Engine runs cooler.

8. Engine runs hotter.

9.Engine is water cooled.

9. Engine is air cooled.

10. Less fuel consumption and full burning of fuel.

10.More fuel consumption and fresh charge is mixed with exhaust gases.

 

11. Engine requires more space.

 

11. Engine requires less space.

12 Complicated lubricating system.

12.Simple lubricating system.

13. Engine creates less noice.

13. Engine creates more noice.

14. Used in cars ,buses, trucks.

14. Used in mopeds, scooters, motorcycles.

15. Engine consists of inlet and exhaust valves.

15 Engine consists of inlet and exhaust ports.

16. More thermal efficiency.

16. Less thermal efficiency.

17. It consumes less lubricating oil.

17. It consumes more lubricating oil.

18. Less wear and year of moving parts.

18. More wear and tear of moving parts.

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