ARP Rod bolts re-use? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-11-2012, 09:28 PM   #1
Hittin' Boost & Cones
Thread Starter
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default ARP Rod bolts re-use?

Are the ARP rod bolts on the M-tuned rods torque to yield? If so can they still be reused? Is there a bolt elongation spec?

Thanks
240_to_miata is offline   Reply With Quote
Old 07-11-2012, 09:42 PM   #2
Junior Member
iTrader: (2)
 
Join Date: Nov 2010
Location: NoVa
Posts: 163
Total Cats: 0
Default

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."
g_reichow is offline   Reply With Quote
Old 07-15-2012, 04:46 AM   #3
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,363
Total Cats: 1,323
Default

If you didn't measure the free length before installation, you need to replace them.
Savington is online now   Reply With Quote
Old 07-17-2012, 01:45 AM   #4
Junior Member
iTrader: (3)
 
Join Date: Apr 2009
Location: hatboro pa 19040
Posts: 50
Total Cats: -3
Default

generally if you used them only once you can reuse them, but always measure first. you can also get a reference from arp for their factory length.
evilrome0 is offline   Reply With Quote
Old 07-17-2012, 07:16 AM   #5
Hittin' Boost & Cones
Thread Starter
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

Thanks guys. I'll let my machine shop measure and decide. They may even have new arp studs on hand.
240_to_miata is offline   Reply With Quote
Old 07-19-2012, 05:44 AM   #6
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,363
Total Cats: 1,323
Default

Quote:
Originally Posted by evilrome0 View Post
you can also get a reference from arp for their factory length.
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.
Savington is online now   Reply With Quote
Old 07-19-2012, 06:16 PM   #7
Elite Member
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

IMO if your not sure if you should reuse them you probably shouldn't. Goes with the cheap insurance thing.
astroboy is offline   Reply With Quote
Old 06-23-2013, 09:03 AM   #8
Junior Member
iTrader: (1)
 
Join Date: Jan 2008
Posts: 161
Total Cats: 0
Default

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.

Attached Thumbnails
ARP Rod bolts re-use?-arp-fasteners-2000-3-8-1-16.jpg   ARP Rod bolts re-use?-arpfasteners20003-81-16.jpg  
Attached Files
File Type: pdf 118-6401.pdf (115.5 KB, 107 views)
File Type: pdf 200-6209 2000 3-8 1.6.pdf (116.8 KB, 174 views)

Last edited by psiturbo; 06-23-2013 at 11:17 AM.
psiturbo is offline   Reply With Quote
Old 06-23-2013, 10:48 PM   #9
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,363
Total Cats: 1,323
Default

The M-Tuned/SCAT/Eagle/Manley bolts are 1.500" UHL, not 1.600. We have them in stock, $70/set.
Savington is online now   Reply With Quote
Old 06-23-2013, 11:20 PM   #10
Junior Member
iTrader: (1)
 
Join Date: Jan 2008
Posts: 161
Total Cats: 0
Default ARP rod bolts 2000



Info obtained by Emilio 949Racing.

I will check then, I have not torqued them yet.
Attached Thumbnails
ARP Rod bolts re-use?-arptorquespecsemilioinfo.jpg  
Attached Files
File Type: pdf Rod_torque_specs.pdf (83.2 KB, 221 views)
psiturbo is offline   Reply With Quote
Old 06-24-2013, 07:34 PM   #11
Ian
Junior Member
iTrader: (2)
 
Join Date: Jan 2012
Posts: 163
Total Cats: 4
Default

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.
Ian is offline   Reply With Quote
Old 06-24-2013, 08:10 PM   #12
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,363
Total Cats: 1,323
Default

Quote:
Originally Posted by Ian View Post
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.
Torquing ARP head studs past 80ft.lbs on a Miata head is a great way to crack the head.
Savington is online now   Reply With Quote
Old 06-24-2013, 09:10 PM   #13
Junior Member
iTrader: (1)
 
Join Date: Jan 2008
Posts: 161
Total Cats: 0
Default

The digital caliper and the bolt hole thru template states they are 3/8...

The bolt head stamp is ARP 2000 -16.
psiturbo is offline   Reply With Quote
Old 06-24-2013, 09:58 PM   #14
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,363
Total Cats: 1,323
Default

SCAT must be using a different rod bolt, then. I just measured a BNIB Manley rod bolt (ARP2000) at 1.500" UHL.
Savington is online now   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
WTB Bellhousing Bolts patsmx5 WTB 1 10-01-2015 10:43 AM
Bp/b6 Scat H beam rods Dparks7 Miata parts for sale/trade 1 09-28-2015 10:49 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:21 AM.