Answer Posted / sriram

4s engine is more efficient than 2s as comapred with the
following:
load: 4s more load carrying capacity
2s less load carrying capacity
efficiency: 4s more efficient
2s less effficient
power :4s more
2s less

the reasons being ,the presence of valves in 4s helps it to
take in fresh charge and drive out the exhausts more
effectively then in 2s

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