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Old 03-01-2004, 09:03 AM
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crankshaft counter weights

Im working on a 351w with a forged steel crank with a 4" stroke. This motor is a nitrous motor that I wanted to try out for a long time because it uses 6.0" rods which comes to 1.50 rod ratio. I will not use a longer rod for this motor, so I hope no one is going to post use longer rods and wants to debate on rod length. I really want to test and see how shorter rods work with nitrous. Anyhow my question is that when the rods and pistons are install they do not clear the crankshaft counter weights. They dont clear by about .050inch. Prior to balancing, can the weights be ground down with out any problems or does it have to be lathed? This is going to sound a little crazy but since it hasent been balanced yet, and im only needing .050inch can I just grind it down myself?

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Old 03-01-2004, 11:25 AM
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Your best bet is to have it turned down on a lathe. That way the amount removed will be consistent. Either way, you may have to add heavy metal when the balancing is performed.
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Old 03-01-2004, 11:45 AM
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Have you considered milling the piston skirts by .060"? Piston integrity would not be affected by this process. It seems to me that this would be a simpler and less expensive operation, with a smaller margin for error. .010" clearance (cold) should be adequate skirt/counterweight clearance.

Just my $.02
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Old 03-01-2004, 11:49 AM
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Milling it would be problematice 'cause it's probably interfering where the skirt curves, not on the bottom of pin boss.
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Old 03-01-2004, 01:04 PM
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its not the skirt thats in the way, its where the pin gos through part of it. The pistons have too much meat on the bottom side of the pin bores
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Old 03-01-2004, 01:49 PM
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How thick is it at the thinnest point?
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