In this post, I am going to tell you about the difference between two stroke and four stroke engines. The main difference between them is that in 2 stroke engine the crankshaft revolves two times to complete its working cycle whereas in 4 stroke, the crankshaft does 2 revolutions to complete its working cycle.
Let’s try to understand their differences in detail.
Two Stroke Engine
Four Stroke Engine
Difference Between 2 Stroke and 4 Stroke Engines
|S.No.||Four stroke engine||Two stroke engine|
|1.||It has one power stroke for every two revolutions of the crankshaft.||It has one power stroke for each revolution of the crankshaft.|
|2.||A heavy flywheel is required and the engine runs unbalanced because turning moment on the crankshaft is not even due to one power stroke for every two revolutions of the crankshaft.||A lighter flywheel is required and the engine runs balanced because turning moment is more even due to one power stroke for each revolution of the crankshaft.|
|3.||Engine is heavy in Weight.||Engine is lighter in weight.|
|4.||Engine design is complicated due to the valve mechanism.||Engine design is simple due to the absence of valve mechanism.|
|5.||It is costlier.||Less cost than 4 stroke engine.|
|Less mechanical efficiency due to more friction in many parts.||More mechanical efficiency due to less friction on a few parts.|
|7.||More output due to full fresh charge intake and full burnt gas exhaust.||Less output due to mixing of fresh charge with the hot burnt gases.|
|8.||The engine runs cooler. It means that Temperature runs on lower temperatures.||Engine runs hotter. It means that the engine temperature is higher as compared with two stroke engines.|
|9.||The engine may be air-cooled or water-cooled.||The engine is air-cooled.|
|10.||Less fuel consumption and complete burning of fuel.||More fuel consumption and a small amount of fresh charge is mixed with exhaust gases.|
|11.||The engine requires more space.||The engine requires less space.|
|12.||Complicated lubricating system.||Simple lubricating system.|
|13.||Less noise is created by the engine.||More noise is created by the engine.|
|14.||The engine consists of an inlet and exhaust valve.||The engine consists of inlet and exhaust ports.|
|15.||More thermal efficiency.||Less thermal efficiency.|
|16.||It consumes less lubricating oil.||It consumes more lubricating oil.|
|17.||Less wear and tear of moving parts.||More wear and tear of moving parts.|
|18.||Used in cars, buses, trucks, etc.||Used in mopeds, scooters, motorcycles etc.|
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Image Source: http://en.wikipedia.org/wiki/Four-stroke_engine