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Advantages of Four stroke Engine Over Two Stroke Engine

ADVANTAGES OF FOUR STROKE ENGINE :

1. Thermal efficiency is high 

2. Volumetric efficiency is more.

3. Lesser cooling and lubrication are required.

4. Overall efficiency is more.

5. Lesser rate of wear and tear.

6. Used in heavy vehicles such as cars, buses, trucks etc.

7. Release of exhaust gas is more uniform and hence noiseless operation.

8. Specific fuel consumption is less because of separate exhaust stroke.

9. More compression ratio. 




DISADVANTAGES OF TWO STROKE ENGINE :

1. Thermal efficiency is low.

2. Volumetric efficiency is low. 

3. Greater cooling and lubrication are required.

4. Overall efficiency is less.

5. Greater rate of wear and tear.

6. It is used in light vehicles only. Eg(scooters, motor cycles, mopeds).

7. Sudden release of exhaust gases makes the exhaust more noisy.

8. Specific fuel consumption is more because of escaping of the fresh charge with exhaust        gases.

9. Less compression ratio. 



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