Answer / sanjyot

by the arrangement of the valves ...in two stroke exhaust
valve is situated at the top(i.e cylinder head) and there
are scavenge ports at the bottom in modern diesel
engine...whereas in four stoke the exhaust and inlet is
situated at the cylinder head.

Answer / dineshkumar

in that cylinder head is there is a inlet valve and exaust
valve means its called a 4-stroke.... otherwise there is a
only a exhaust valve means its called a 2-stroke .............

Answer / marine engineer

There is a great confusion between the answers as i have
mentioned before that BY ARRANGEMENT OF THE VALVES is
applicable only for modern MARINE diesel engines as it is a
marine engineering web page whereas the answer which
mentions that no valves are situated in 2S engines is
applicable for smaller engines may be when at the times of
SIR RUDOLF DIESEL BUILT ONE or a yamaha rx 100 bike engine
...the exhaust valve of marine enine is operated by means of
servo oil which is mechanically controlled by cam
arrangement or computer controlled in ME type of
engines....also the basic thing for identification is that
2S engines are big and 4S engines and smaller of comparative
power...again if you want to go further than try and have a
look at the flywheel >>> that is >>>a 4S engine flywheel
will be bigger than the 2S flywheel as power is stored at
every rotation of crankshaft whereas it is every 2 rotations
in case of 4S engine...also marine engines are of crosshead
type i.e a crosshead is provided whereas in 2S the same work
of taking transverse load is done by piston skirts in 4S
engine...i guess this is fine...any doubts about marine
diesel engine???

Answer / vikram singh

in 2 stoke the exhaust is wet and 4 stoke the exhaust is dry
beause in 2 stroke we mix mobile oil with the petrol,which is not burn properly

Answer / sayan sanyal

Only by looking at the engine its very simple to know what type of engine it is.If there is 'A'-frame & no rocker arm  for exhaust valve at cylinder head, then it is a 2-S engine. If rocker arm is there then it is a 4-S engine.

Answer / kumaresan

If it is two stroke slow speed engine has one exhaust valve
on top of cylinder head which is operated by means of
hydraulic oil(may be same system oil)actuated by
cam.Scavenge/charge air will enter in to via scavenge port
which is blow the liner.but medium speed two stroke engine
has inlet and exhaust valves on top operated by means of cam
actuated by means of push rod.

Answer / bala le marine

in 4s exhaust will be on the fuel pump side,where as for 2s
exhaust manifold and fuel pump will be on different
side.this is the only correct answer.thank you :)

Answer / natan

2 stroke engine have high pressure pipes on each cylinder
use for opening the exhaust valve when the engine is
running'while 4 stroke engine dont have

Answer / m c a nair

In 2 stroke engine there is no valves , instead there is ports; piston opens and close the ports

where as in 4 stroke engines there are valves operated by other mechanisms

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