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Tuesday, October 23, 2012

CLASSIFICATION OF ENGINES AS PER BORE/STROKE RATIO

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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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