Posted by : Sayantan Mandal Sep 28, 2010

Actually 2-stroke engine work in a very similar way to that of 4-stroke engine. Only there's a difference between the number of strokes or no. of cycles.

In a 2-stroke engine-

Demonstration Of Two Stroke Engine's Working
Demonstration Of Two Stroke Engine's Working

The piston comes down and pressurizes the mixture of oil/air/gas upwards into the combustion chamber, this displaces the extra exhaust.

Now comes the most important stroke i.e. the Second stroke or Compression stroke:
Now the piston moves up, towards the spark plug this creates a vacuum in the crankcase and opens the inlet port & sucks the mixture into the crankcase from the carburetor. Here the piston compresses the mixture which it got in First stroke, the Spark plug ignites the mixture. This drives the piston back and the cycle continues....
See the Diagram while reading this would help you a lot.

In a four-stroke engine, there are separate intake, compression, combustion and exhaust strokes.
You can see here, intake and combustion is occurring at the same time, moreover instead of taking 4-stroke, it is burning the gas in just 2-stroke/cycles. These advantages make two-stroke engines lighter, simpler and less expensive to manufacture. Two-stroke engines also have the potential to pack about twice the power into the same space because there are twice as many power strokes per revolution. The combination of light weight and twice the power gives two-stroke engines a great power-to-weight ratio compared to many four-stroke engine designs.

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