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| Author |
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Len Tate
| | Posted on Saturday, January 10, 2004 - 05:21 am: | 
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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? |
Richard Day
| | Posted on Saturday, January 10, 2004 - 09:15 am: |
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Why bother most of the early engines didn't have counterbalance crankshafts? |
J.B. Castagnos
| | Posted on Saturday, January 10, 2004 - 01:48 pm: |
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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. |
rholcomb
| | Posted on Sunday, January 11, 2004 - 12:48 am: |
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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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