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addictionMS addictionMS is offline
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Join Date: May 2001
Location: Northern CA
Posts: 2,131
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ARP Rod Bolts data

I thought I would post some data from my crank assembly.

The crank was magna fluxed, center drilled and micro polished, std/std, using ARP rod bolts, rods were re-sized with the ARP bolts

So here is the data not sure how much value it has, but here it is anyway

I measured each bolt before and after the stretch, I used a stretch gauge to measure lentgh, goal was 0.0120-0.0115 inches, so all measurements are in inches.

I considered myself done when the gauge said I have between 0.0110 and 0.0120 stretch. So the stretch in the list is measured by calipers .

To respond to the concern in this ARP stretch failure thread there was no way I would have not noticed that the bolt stretched too easily, it took considerably more effort the get to the stretch than the alternative torque method of 45 ft/lbs

the data

before/after/stretch

2.795 / 2.803 / 0.008
2.792 / 2.802 / 0.010
2.793 / 2.803 / 0.010
2.794 / 2.802 / 0.008
2.794 / 2.805 / 0.011
2.786 / 2.798 / 0.012
2.790 / 2.801 / 0.011
2.800 / 2.813 / 0.013
2.786 / 2.797 / 0.011
2.791 / 2.801 / 0.010
2.795 / 2.806 / 0.011
2.792 / 2.803 / 0.011
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Jim Hamilton

If everything seems under control, your not going fast enough.

Last edited by addictionMS; 12-29-2004 at 04:42 PM..
Old 12-29-2004, 04:39 PM
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