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a) Square Engine:
If bore/stroke is about one, crankshaft web dimensions
become less compared to journal and crankpin.
b) Over Square Engines (Short Stroke)
If bore/stroke > 1, web dimensions (less height, more
thickness) are such that webs will be weak. So generally over square engines
are not used.
(c) Long Stroke Engines.
Generally, engines have stroke/bore >1. This gives
crankshafts of good strength. Most common ratio is stroke/bore = 2. 0:
2.2.
(d) Super-long Stroke Engines.
To have better propeller efficiency and better combustion
even with lower grade fuels, lower r.p.m. engines with longer strokes are
gaining popularity. These engines have stroke/bore ratio = 3.
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