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Old 02-25-2009, 12:23 AM   #1
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Default Driveshaft Critical Speed Charts?

I have looked at Mark williams, Strange and the Wallace Racing formulas and they all give different answers for driveshaft critical speed.
My questions are do you just measure tube length or u joint center to center?
Then do you pick a brand and follow there recommendation?
I am partial to Mark Williams but they are the most expensive and the most conservative on the critical speed chart.
Right now I have a 3 1/2" .083 mild steel at about 7500 rpm and 54" long center to center made by a local shop. I put a nice dent in it on my ladder bar cross member and need to replace the driveshaft. My ladder bar cross member has been relocated. Thanks, Brian
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Old 02-25-2009, 04:56 PM   #2
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Default Re: Driveshaft Critical Speed Charts?

I have always ran a Spicer non-twist tube in my car that is 3" dia and never had a problem with that mild steel going 8000 thru the traps. Mine is 44" long and 3" dia.

Found an OEM link for ya,
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Old 03-17-2009, 12:48 PM   #3
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Default Re: Driveshaft Critical Speed Charts?

Many different ideas out there on shaft speed, i have always used the formula that spicer uses.
Alum shafts are higher.

Some shafts i make for nascar cars are in my opinion exceeeding the rpms of the shaft, but they don't break, so maybe im wrong...
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