I have eagle rods for my d16 motor that im building and they have arp2000 rod bolts in them. Alot of kids on h-t say the torque spec is 28ftlbs for the 3/8 head bolt. When i called eagle they said 43 with molly…and the machine shop rehoned them at 48ftlbs and said thats what i should run them at. Think its ok to run them so high?
look through and read up. everything should be posted here.
already checked that out.
The only way to be sure of the correct torque is to measure stretch. Read up on ARP’s website about the correct stretch for ARP-2000 bolts, It should be between .006" and .008".
Once you do that, THOROUGHLY clean all bolt threads and holes. Apply ARP Moly-Lube to the bolts. For good measure, screw in all bolts by hand once and remove, to distribute lube and check for burrs. (will also polish threads slightly). Remove the bolts, and reapply lube, especially under the bolt head. Using a bolt stretch gauge, meaure the bolt stretch as you tighten in increments. Once the correct stretch is reached, stop and try another bolt. If the second and third bolts all stretch to the correct length at a given torque with no large variances, it is a safe bet to torque the rest of them to that specification. If you are looking for perfection, you can do each bolt individually if you want…just takes time.
PS- Viper’s have 3/8 ARP-2000 bolts OEM. The Spec per the manual is 50 lb/ft- but that is with ENGINE OIL as the lube. With Moly lube, it will be substantially lower. You just have to remember, “torque spec” is the twisting torque, NOT the clamp load. The clamp load will very greatly depending on the lube, if any. For example, a bolt into an aluminum block may have a dry torque spec of 25 ft/lbs, but if you lube it with moly-lube and use that same spec, you may very well pull the threads right out of the block due to the lube reducing the needed twisting force to overcome friction, and it becomes a greater clamp load than before.
Do what the manufacturer tells you. 43ftlbs with moly
If I had a dollar for every screw up from a manufacturer I have caught, I would own a small island in the carribean complete with a yacht and a sea plane. Manufacturers have a tendancy to overlook details and make blanket “instructions”.
“Whoops… that was for an SPS not an ARP. Oh well, We’ll change it for 2007”
Very well put
the only problem is the machine shop resized the rod at 48 ft/lbs and said the bolts need to be torqued to that. Idk why he chose this number but he said just do it.
For once, I agree with you, though I still suspect you are the guy who speeds down my street.
Let me know what street it is, and I will let you know if it was me.
I am always available for special appearances if you want to put the issue to rest once and for all…lol
(though, at the moment…you will need to rent a fast tow truck)
See this is for all the haters that say I disagree with everything just to be an asshole.
Even though I don’t like Dan one bit, HE IS ABSOLUTELY CORRECT I only disagree with wrong info