Answer / priyanka baranwal

theoratically-four stroke working cycle is completed in two
complete revolution of crank shaft but two stroke working
cycle is comleted in one revolution.
practically-in four stroke contains valves as inlet and
outlet valves but two stroke contains port like transfer
port,inlet port,outlet port.

Answer / vedansh chaturvedi

two stroke engine has port and four stroke engine has
valve,thermal efficiency of four stroke engine is better
than two stroke engine,power produce by two stroke engine is
greater than four stroke engine.

Answer / zishan

Two stroke engine has ports inlet and outlet but on yhe
other hand 4- stroke engine has valves inlet and outlet
valves.
Two stroke engine complete its cycle or give one power
stoke in one revolution of crankshaft but 4-stroke engine
complete its cycle or give one power stoke in two
revolution of crankshaft .
4-stroke has greater efficency than two stroke bcoz fuel
wasting ratio is less in 4-stroke.
2-stroke has greater power than 4-stroke engine.

Answer / 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.

Answer / sonali japkar

Four stroke engine Initial cost high . &
Two stroke engine Initial cost low .
2. Four stroke engine Running cost
less .& Two stroke engine Running
cost more .
3. Four stroke engine No need of
scavening .& Two stroke engine
Need of scavening .

Answer / jagdish japkar .

1. four stroke engine The
cycle is completed in two
revolution of crank shaft . &
Two stroke engine The cycle
is completed in one revolution
of crank shaft .
2. four stroke engine Lesser
rate of wear & tear. & Two
stroke engine wear & tear
rate is more .

Answer / sunil patil

in 2 stroke engine all four cycle are completed in one
revolution of cranshaft whereas in 4s all four cycle are
completed in two two revolution of crankshaft. two stroke
engine have better pimck up then four stroke engine.2s
engine are more polluting ,noisy & fuel consumption compare
to four stroke

Answer / bhim

Theoriticlly 4 stroke engine thermal efficiency is more nd
for 2 stroke it is less
cycle completed in 2 revolutions for 4 stroke, 1 revolution
in 3 stroke.
Prctically the cost of the 2 stroke is less and the design
is robust compared to 4 stroke as it has ports instead of
valve mechanism. and the wear and tear is more in 2 stroke
compred to 4 stroke.

Answer / jagan

In two stroke engine, One cycle completes in one revolution
whereas in four stroke engine, one cycle completes in two
revolution.
In two stroke engine, scavenging is must to get the
in-exhaust fuel exhausting.
Two stroke engine has ports whereas four stroke engine has
valves.
Thermal efficiency is less in case of two stroke engine when
compared with the four stroke engine.
More pick up in case of two stroke engine whereas more
mileage in case of four stroke engine.

Answer / harsh

In 4 stroke ingines ignition is done due to high pressure and tempereture whereas in 2 stroke ignition is done by spark plug.

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