Answer Posted / nageswara rao

Theoretically ,four stroke engine cycle is completed in two
revolutions of the crankshaft where as two stroke engine
cycle is completed in one revolution of the crankshaft
Theoritically two stroke engine will produce the power of
two times that of the fourstroke engine...but practically
it is 1 to 1.5 times only...
consruction of four stroke engine is very
difficult than compare with the two stroke engine because
of valve mechanism is present in the four stroke engine...
but two stroke engines are produced more pollution than
that of four stroke engine...why because some of the flue
gases are directly escapes through the ports of the two
stroke engines..hence the usage of two stroke engines are
banned...but these are esentially used in ships where the
reversing of engine is necessary ..it is possible only by
the two stroke engines not by the four stroke engine..
Thermal efficiency of four engine is more than
compared to two stroke engine.

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