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Old 07-24-2008, 10:20 AM
ScoTFrenzel ScoTFrenzel is offline
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Originally Posted by k-star
I have been in some top notch builders shops and seen what they do. I am not saying it happened here, but something to think about..

Some of the bigger well known shops are very busy and they do not have time for a lot of detail work. It takes a long time to stretch each rod bolt. What I have seen happen is they will do one bolt, calculate the required torque and do the other 15 bolts with a torque wrench. I can tell you first hand this does not work…

A lot of times in this type of failure the true cause is never found

Absolutely Keith is right.
I've seen it too, in some pretty substantial race shops.

One thing I learned on my own is that ARP stretch is usually about 25% more torque than what ARP specifies. That convinced me that stretch is the only way to tighten a rod bolt for true high performance useage.
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