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, 08:08, 16 November 2016
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Two-stroke engine | Four-stroke engine
Two-stroke engine has ports for inlet , outlet and transfer. |Four-stroke engine has two complicated valves , one for inlet and one for outlet .
Two-stroke engine gives one power stroke in each revolution of the crank-shaft. |Four-stroke engine gives one power stroke in two revolutions of the crank-shaft.
For same size, same speed and same running conditions two stroke engine developes twice the power developed by four-stroke engine. |Power developed by four-stroke engine for same size , same speed and same running conditions is almost half same running condition is almost half of the power developed by two-stroke engines.
It provides simplicity as valves, rocker arms, push-rods ,cam and cam shafts are not required to operate ports. | Due to valves , rocker arms , push rods , cam and cam shafts construction is complicated and friction loss is also greater.
High temperature is attended during the operation of two stroke engine hence more cooling is required.| Lower operating temperature in comparison to two-stroke engines. Less cooling is required.
Two stroke engines are much easier to start. | Four stroke engines are difficult to start.
The initial cost is considerably less.|The initial cost is considerably high.
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