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Crankshaft balancing
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Posted by: proace

07/18/2004, 23:29:50

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When balancing a crankshaft would I be counterweighting for the crank pin and its distance from center or weight of the crank pin plus connecting rod, wrist pin and piston?

Thanks








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Re: Crankshaft balancing
: Crankshaft balancing -- proace Post Reply Top of thread Engineering Forum
Posted by: cylinderjockey

07/27/2004, 10:24:47

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You want to counter the piston, rod and pin. On TDC your weights should be down. Hope this helps







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Re: Crankshaft balancing
: Re: Crankshaft balancing -- cylinderjockey Post Reply Top of thread Engineering Forum
Posted by: proace

08/09/2004, 22:14:58

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So to say that if my piston, rod, pin were to weigh ??oz's then the counter weight would weigh the same amount?

I wonder this because the counter weight is closer to the center of rotation than the piston and pin.
Thanks








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Re: Crankshaft balancing Smile
: Re: Crankshaft balancing -- proace Post Reply Top of thread Engineering Forum
Posted by: manulal

01/17/2005, 01:25:42

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Not exactly. We are not balancing the weight, but the force. The unbalanced force created by the pin, con rod and piston has to be calculated and it should be balanced by counter weights. The formula being F = M*R*W*W.    W = rpm, R = Distance of the centre of mass of the counter weight from the crak shaft centre line. M = mass of counter weight. So the mass of the counter weight varies inversely proportional to the distance from centre line.








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: Re: Crankshaft balancing
: Re: Crankshaft balancing -- manulal Post Reply Top of thread Engineering Forum
Posted by: Alexs

10/06/2009, 11:10:16

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Hello, does any one can provide such service? i have some 26cc motors, and i want to balance the cranks..


thanks
Alex

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Modified by Administrator at Tue, Oct 06, 2009, 11:11:56


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