A British engineer Introduce a cycle which could be completed in two strokes rather than four strokes.two stroke engine has one power cycle which is completed when the piston moves up (TDC) and down(BDC). In other words , A two stroke engine is an engine which complete the 4 stroke mechanism in the 2 stroke only. two stroke engine fire on every revolution of the crank shaft because of this two stroke engine is more powerful than a four stroke engine for the equivalent size.
In this engine the end of combustion stroke and the beginning of compression stroke take place at the same time .
when the piston moves from top to bottom, the air- fuel mixture in the crankcase is compressed and some amount of air-fuel mixture is pushed up the tubes to finally exit into the space above the piston via hole which called as transfer port . piston continues to rise it first cover that port, then compress the mixture and spark ignites it.
The expanding gases from the spark-ignited exploding mixture forced the piston back down and as it drop another hole is exposed in the front of the cylinder, now the exhausted gas comes out to the atmosphere.
The two stroke engine operate on the same principles as as four stroke engine, All these four process complete in the two stroke only .
- Intake
- Compression
- Power
- Exhaust
Advantage of two stroke engine.
- Simple construction
- Light weight
- No valves mechanism
- Fire once in every revolution
- High Power to weight ratio
- Torque produce on the crankshaft is uniform
- Can work in any position
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