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Engine balancing

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farmall flogger

02-20-2002 20:56:48




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I was wondering how much stroking a crank affects an engine's balance. Do any of the better engine builders ever balance the engine after stroking? I know the old antiques don't turn up that much but I was just wondering if there was any HP or longevity to be gained. Some classes allow higher rpms, 2500-3000. I would think balancing would really be beneficial here. What's the general opinion?




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redhead

02-21-2002 20:08:31




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 Re: engine balancing in reply to farmall flogger, 02-20-2002 20:56:48  
Any reputable engine builder will balance an engine as part of a standard performance build-up. Stroking (cutting a crank) changes the rotating mass (in a manner that is hard to reproduce X2, X4 or X6 cylinders) and therefore MUST have the balance at least checked, if not changed. As for the lower rpms, think about it this way: any performance street/strip engine should be able to make one horsepower and one foot pound of torque per cubic inch at 5000-6000 rpms. What we are shooting for is the same thing, only on a smaller scale of 25-35 percent (or more) because of the maximum rpm which is allowed. But, balance still carries the same percentage weight in the overall picture. Good Luck.

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G-MAN

02-22-2002 10:23:11




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 Re: Re: engine balancing in reply to redhead, 02-21-2002 20:08:31  
you have a good point redhead. but the only rpm that an engine will produce equal horsepower and torque at is 5252. this is the rpm used to figure horsepower from torque. torque is the work you can do, horsepower is how fast it can be done. just my two cents, for what it's worth.



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