ARP Rod bolts re-use?
#2
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ARP's website mentions that their bolts are reusable but should be replaced when they have permanently stretched.
To quote ARP's page at : ARP-bolts.com | ARP - World-leading Fastener Technology
" As a rule of thumb, if you measure a fastener and it is .0005˝ (or more) longer than its original length it has been compromised and must be replaced."
To quote ARP's page at : ARP-bolts.com | ARP - World-leading Fastener Technology
" As a rule of thumb, if you measure a fastener and it is .0005˝ (or more) longer than its original length it has been compromised and must be replaced."
#6
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ARP is very good, but they aren't this good. I typically see a variance of at least ~.005" from bolt to bolt for length, which is enough to make any published reference length worthless for the OP's usage.
If the bolts don't return to within .0005" (that's half a thousandth) of their original free length, they're scrap.
If the bolts don't return to within .0005" (that's half a thousandth) of their original free length, they're scrap.
#8
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Sorry to revive, found the ARP part number 118-6401, for replacement stock rods.
For H-Beam forged, ARP part number 200-6209.
Let me edit a little bit; the sheet is for the hi performance, not M-tuned.
Here is a link for the M-Tuned fasteners.
ARP 2000 5/8 1.6
Found this other site, 2000 ARP torque specs
Just in case the attachment does not work.
For H-Beam forged, ARP part number 200-6209.
Let me edit a little bit; the sheet is for the hi performance, not M-tuned.
Here is a link for the M-Tuned fasteners.
ARP 2000 5/8 1.6
Found this other site, 2000 ARP torque specs
Just in case the attachment does not work.
![](https://www.miataturbo.net/attachments/engine-performance-56/80307-arp-rod-bolts-re-use-arpfasteners20003-81-16.jpg?dateline=1371996946)
Last edited by psiturbo; 06-23-2013 at 10:17 AM.
#12
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Meh. I just kept torquing the ARPs headstuds down by 5ft/lbs on my old DSM until the head stopped leaking. Who cares if they were at 100ft/lbs, they held 25 psi + just fine on a daily basis.
It's probably best to replace, but I think you can get by if you're willing to accept the risks.
It's probably best to replace, but I think you can get by if you're willing to accept the risks.
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