why valves not used in two stroke engines?
Answers were Sorted based on User's Feedback
Answer / deependra singh parihar
Because in these engines the working cycle is completed in
1 cycle of crank shaft. so the time of cooling for the
engine is less compared to 4 strke Engines. During at the
end of compression stroke the Tempreture inside the bore
goes to 1500 - 1700 degree c. at this high temprature the
working of valves gets disturb & valves get damage because
valves are made of iron alloys.to elamanate this ports are
used.
Is This Answer Correct ? | 42 Yes | 5 No |
Answer / saumya ranjan khuntia
Adding few more poimts. A valve arrangment requires some
specific arrangment and also for closenig and opening of
valve we are using spring.As all of us know that there will
be one power stroke in one revolution of the crankshaft in
case of 2-Stroke engine means actually its completing same
sequence i.e Suction,Compression,Expansionand Exhaust, but
in a quickep manner. So the process is instantaneous and
should operate more quickly. If we will use Valve, then It
might creat a problem and might affect our power
production. So in my view this is one of the important
reason for not using Valve is 2-S engines.
Is This Answer Correct ? | 8 Yes | 1 No |
Answer / anjaney
4 stroke engines gives 1 power stroke in 2 revolution so
to get 1 power stroke in one revolution, two strokes need
to be completed in 180 degree so as get 1 power stroke /
revolution. this leads to development of port of 2 stroke
engine.
Is This Answer Correct ? | 3 Yes | 5 No |
Answer / v.vinoth
Two Stroke Engine is gives a high power output over a wider
RPM range.
Is This Answer Correct ? | 7 Yes | 10 No |
Answer / zubair
Two Stroke Engine gives high power output over a wider
RPM range.
Is This Answer Correct ? | 3 Yes | 7 No |
Answer / anandan
two stroke engines have only ports. so valves are not used
here
Is This Answer Correct ? | 6 Yes | 10 No |
Answer / karthick raja
in two strokes there is no need for valves since ports do work .the ports itself let the fuel in and out in 2 stroke engines whereas in 4 strokes separate valves are needed to do the work
Is This Answer Correct ? | 0 Yes | 4 No |
Answer / baskaran
usually valves used in 4 stroke engine produces excess
vibration.since power output in 2 stroke is high using
valves here may lead to more vibration.hence in order to
avoid vibration ports are used here.
Is This Answer Correct ? | 1 Yes | 6 No |
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