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56 322 Nailhead Stroke


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  • 2 weeks later...
Guest Bob Call

In some circles this is also referred to as over square. An engine with equal bore and stroke would be square. With bore larger than stroke is over square and with bore smaller than stroke is under square. The advantage of over square is that in cylinders of equal volume the piston speed of the over square is slower.

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I was wondering the same thing. Then I thought, at a given RPM, the shorter the stroke the less distance the piston has to travel in a given time. Hence a slower speed in surface feet per second. At least that's how I figured it but I could be wrong.........Bob

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