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Crankshaft Balancing

Old Marine Engine » One and Two Cylinder Gas Inboards » Crankshaft Balancing « Previous Next »

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Len Tate
Posted on Saturday, January 10, 2004 - 05:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am thinking of fabricating a crankshaft for a single cylinder two stroke marine engine, but I don't know how to calculate the size of the counterweights on the crankshaft webs. Can anyone help please?
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Richard Day
Posted on Saturday, January 10, 2004 - 09:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Why bother most of the early engines didn't have counterbalance crankshafts?
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J.B. Castagnos
Posted on Saturday, January 10, 2004 - 01:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I've balanced a couple, it helps to smooth them out if you're running it in a boat. If it's just a show motor it's probably not worth it. The formula I was given was to add half the reciprocating and all of the rotating weight. This would be the total of the big end of the rod and bearing, and half of the total of the piston, rod, and bearing clamped on the crank pin and counterweights added to balance. The engines I balanced had drilled flywheels, it was still on the light side after adding the weights.
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rholcomb
Posted on Sunday, January 11, 2004 - 12:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I found this interesting site on the net
http://members.aol.com/pullingtractor/balance.htm

there is a warning here that might apply to us
a flywheel came apart and it didnt hit his leg...............

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