rod bolt torque on arp 8740?
Thread Starter
Joined: Aug 2005
Posts: 384
Likes: 1
From: Rockingham, NC
rod bolt torque on arp 8740? The title pretty much somes it up need to know the rod bolt spec for arp 8740 bolts they have the 7/16 bolt heads and are 1.6" going into SCAT H Beams. Also do you have to use ARP moly or will the local store bought stuff work? Thanks
What brand is the rod it goes in? You're better off calling the company that made them and see what they say. Chances are they will only have a spec for the ARP Moly lube or regular motor oil. If you use anything else, you may need to measure stretch instead.
Thread Starter
Joined: Aug 2005
Posts: 384
Likes: 1
From: Rockingham, NC
Rods are SCAT H beams. They have been run before I had to tear down due to an oil pressure issue. Turns out the builder never bolted the oil pump pickup to the oil pump. It was bolted to one of the studs. Ended up eating the Main bearings, and rod bearings so I had the crank turned to +10 and now I have all the parts bearings included. Just not sure on the torque spec. I know its different than factory though.
Did the motor originally have arp rod bolts? The reason being is that arp recommends line boring the rods to ensure they are perfectly round because the extra clamping force of the arp bolts will distort the rod bore from what it was before
Thread Starter
Joined: Aug 2005
Posts: 384
Likes: 1
From: Rockingham, NC
To answer the question they are the same bolts that came with the rods and have been in the LQ for about 20K miles before its oil pressure dropped and I pulled it. I just dont have the torque spec originally the spec would have come with the instructions in the box. I dont want to get it wrong when it goes back together. Guess I need to call SCAT and talk to a technician and see what they can dig up. Ill post up what I find.
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Right, with the cracked rods it seems like replacement without machine work is normal.... Hope so as I am planning this next week!
Are the aftermarket rods also a 'cracked' type?
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Verdad Gallardo Thread Starter
Joined: Aug 2005
Posts: 384
Likes: 1
From: Rockingham, NC
Got in touch with SCAT the other day this is what I found out
SCAT H Beams with ARP 2000 => 50 ft lbs
SCAT H beams with ARP 8740 => 63 ft lbs
Also spoke with a mechanic at texas speed and got the torque specs for ARP main studs
Inner => 60 ft lbs
outer => 50 ft lbs
bolts out side of block => 20 ft lbs
Hope this helps someone in the future.
SCAT H Beams with ARP 2000 => 50 ft lbs
SCAT H beams with ARP 8740 => 63 ft lbs
Also spoke with a mechanic at texas speed and got the torque specs for ARP main studs
Inner => 60 ft lbs
outer => 50 ft lbs
bolts out side of block => 20 ft lbs
Hope this helps someone in the future.
Thread Starter
Joined: Aug 2005
Posts: 384
Likes: 1
From: Rockingham, NC
To answer my second question
ARP Brand Moly is not mandatory, store bought can be used just make sure you go back through the motor and retorque to ensure it didn't relax.
ARP Brand Moly is not mandatory, store bought can be used just make sure you go back through the motor and retorque to ensure it didn't relax.
Also, is that for the 3/8" bolts or 7/16"?
