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Limit of stock crank w/ a Procharger...

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Old 05-06-2008, 04:42 PM
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Default Limit of stock crank w/ a Procharger...
Just curious how far the stock cast cranks have been pushed with the Procharged applications.
Thanks
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Old 05-06-2008, 05:47 PM
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I would not reccomend anything past 12 pounds of boost.
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Old 05-06-2008, 05:50 PM
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Wow thats wierd. Ive never heard of a stock crank breaking. And ive heard of way more than 12lbs on a stock crank.
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Old 05-06-2008, 06:01 PM
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you will lift the heads and have all sorts of other issues before the crank lets go or you sheer the snout off of it. dont even worry about it.
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Old 05-06-2008, 06:06 PM
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15-20psi on a stock crank, for two years and 400+ passes @ 7200rpm, and its still working fine in another car..
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Old 05-06-2008, 07:11 PM
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should be no limit... shoot- run a stock bottom end and stock heads like me, just have good fuel n conservative tune.. im running 7.9pounds.. still pushing 543rwhp..
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Old 05-06-2008, 07:12 PM
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15lbs on a stock end here. Conservative timing though.
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Old 05-06-2008, 08:54 PM
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Thanks for the input guys! I'm gonna see how far I can push a time bomb budget short block. The crank will be double keyed but I'll have a crank support on it to it'll have to twist off to fall off.
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Old 05-06-2008, 09:27 PM
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Not a procharger, but mine has seen 26psi. a few times. I have also never heard of a stock crank breaking either?
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Old 05-06-2008, 09:51 PM
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Are you guys(KP, etc) putting a keyway in your crank or what?
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Old 05-06-2008, 10:41 PM
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You need some kind of keyway/pin with any blower, except maybe a 6 rib P1SC on a stock engine under 10psi..
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Old 05-07-2008, 12:28 AM
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stock crank on my last set-up. i had 4 pins on my ati balancer. 2 on each side of the snout. never had any problems at 15psi.
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Old 05-07-2008, 08:59 AM
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I just run a singe 3/16 square key with an ATI balancer and a ARP bolt @ 175ft/lbs, never had any signs of it moving around at all. I think you would take the little snout off the crank before you would shear the single key.
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Old 05-07-2008, 09:38 AM
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Originally Posted by BLNLS1/RX7
I would not reccomend anything past 12 pounds of boost.
12 lbs of boost?


That's like me trying to describe a car to someone and saying it has 4 rubber tires. PSI means nothing.
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Old 05-07-2008, 11:26 AM
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Originally Posted by b00sted
12 lbs of boost?


That's like me trying to describe a car to someone and saying it has 4 rubber tires. PSI means nothing.

HAHAHA, I thought the ecaxt same thing!
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Old 05-07-2008, 11:15 PM
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you will need to worry about the stock rods before anything.
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Old 05-07-2008, 11:19 PM
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Originally Posted by NIIN20
Just curious how far the stock cast cranks have been pushed with the Procharged applications.
Thanks
It is the same with any setup. The stock crank will fail at a given hp/tq level and the right amount of shock. They are worldwide agreed to be reliable up to 1200 crank hp.
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Old 05-08-2008, 09:09 PM
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Originally Posted by kp
I just run a singe 3/16 square key with an ATI balancer and a ARP bolt @ 175ft/lbs, never had any signs of it moving around at all. I think you would take the little snout off the crank before you would shear the single key.
I assume the keyway has to be put in by a machine shop with the crank out of the motor?
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Old 05-08-2008, 10:43 PM
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Originally Posted by Gauge
I assume the keyway has to be put in by a machine shop with the crank out of the motor?
Yes, some aftermarket cranks come with them. They also have pin kits that use round pins that you can use without taking the crank out.
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Old 05-08-2008, 10:45 PM
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Yep, that is for sure!
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