Marine Engineering Question:
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How will we know, without opening anything,that an engine is 2S or 4S?

Answers:

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.

Two stroke engine having spark plug where as four stroke engine having fuel injector.

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