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Answer Posted / 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.
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