Quote:
Originally Posted by deansbimmer
Here is an excerpt from an ARP instruction sheet of their 625 set for the S65:
"[7] A log should be kept on the original non-torqued length of each bolt. Bolts that have any permanent deformation or have increased in non-torqued length by more than .001 in. should be replaced."
This is typical for all of their rod bolts across every make and model, though their dimension specification may be different depending on application or material.
Any bolt regardless of type, material, or application has the potential to stretch and be rendered ineffective. Their process identifies any stretch to monitor the hardware's effectiveness.
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Yes, any bolt has the potential to get plastic deformation, but if you are in the spec it should definitely not stretch.
What they are saying is that if any plastic deformation happens, throw the bolt away. So, the bolts are designed to function exclusively in the elastic zone.
I would like their thoughts on whether they will ever deform plastically using 50ftlb for tightening torque