505 Performance Rod Bolt Torque Spec

[Winners97TJ]

Does anyone have the torque specs for the 505 Performance I-beam rods with 7/16" 8740 ARP bolts?

And since I'm asking, the main's are 80ft-lb, right?

The machine shop that did all of the work on my engine has any paperwork that would have come along with the rods so I do not have access to it for about another week or two. Would like to get this thing done this weekend. Thanks guys/gals!

[5-90]

The mains are 80 pound-feet.

You could always ask 505 - they should tell you. However, torque for bottom end bearings is to give the bearings a certain amount of "crush," which usually means that required tensile preload on the screw runs irrespective of screw nominal diameter (OEM screws are, I believe, 11/32".)

I'd therefore be inclined to think that the OEM torque spec is still used, and would verify this by measuring the bearing ID against the crankpin OD after torquing the cap off of the crank (or using Plasti-Gate, which I don't like doing. I know it's reasonably accurate - but I find it easy to screw up. I put more faith in direct measurement.) Torque the cap screws/nuts, measure the bearing ID, subtract the crankpin OD. Check it against spec clearance - if it's in spec, you're on the right track.

[SilverXJ]

I doubt the rod torque is stock. Stock is 33. ARP bolts in a stock rod are 40. You are trying to achieve a correct amount of bolt stretch. Measuring the bearing ID won't do anything for you except check clearance which is created by the big end rod diameter, bearings and crank journal. That will not change no matter what you torque the bolts to. Call 505.

[Winners97TJ]

Tried calling them today... go figure, they're closed til Monday......

All of the rods that use 7/16" ARP bolts that I found online had torque specs aroud the 63-70ft.lb mark. Thanks for the input guys. Anyone else have any thoughts?

[Retlaw01XJ]

40 ft lbs for the ARP 112-6001 rod bolts in my 4.0 rods. That's with the ARP lube.
If you are using different bolts, then this doesn't apply.....

[Winners97TJ]

These are the ARP 8740 7/16" bolts that are in the 505 Performance I-Beam connecting rods. They can be seen HERE. I would assume that since these are in heavier-duty rods that they would want a touch more torque than 40 ft.lbs though. (But then again, I've been wrong in times past! )
Thanks for the insite Retlaw01XJ. May not be exactly what I was looking for, but definitely helpful.

[Retlaw01XJ]

Oh, ok, Capscrews....those aren't stock! Big difference.

Did a quick Google search and found this post for a 505 kit for sale.... includes 505 Performance 4340 I-beam rods.
Look at the 4th pic down, and the parts list shows they should be torqued to 70 ft lbs.
http://www.pirate4x4.com/forum/showthread.php?t=993209

Or you can look on eBay for the rods and ask the seller for the specs...
http://www.ebay.com/itm/Jeep-4-5-4-6-4- ... 20b456f9e7
http://www.ebay.com/itm/Jeep-Stroker-Ki ... 42#vi-desc

[Winners97TJ]

Oh, ok, Capscrews....those aren't stock! Big difference.

Did a quick Google search and found this post for a 505 kit for sale.... includes 505 Performance 4340 I-beam rods.
Look at the 4th pic down, and the parts list shows they should be torqued to 70 ft lbs.
http://www.pirate4x4.com/forum/showthread.php?t=993209

Or you can look on eBay for the rods and ask the seller for the specs...
http://www.ebay.com/itm/Jeep-4-5-4-6-4- ... 20b456f9e7
http://www.ebay.com/itm/Jeep-Stroker-Ki ... 42#vi-desc

YOU DA MAN!!!
70-lbs it is! That is EXACTLY what I have and EXACTLY what I was looking for! 70 ft-lbs it is. Thanks!

[5-90]

I doubt the rod torque is stock. Stock is 33. ARP bolts in a stock rod are 40. You are trying to achieve a correct amount of bolt stretch. Measuring the bearing ID won't do anything for you except check clearance which is created by the big end rod diameter, bearings and crank journal. That will not change no matter what you torque the bolts to. Call 505.

Ah - so I'm off. Thanks!

I don't know why I got that screwed up...

[Retlaw01XJ]

YOU DA MAN!!!
70-lbs it is! That is EXACTLY what I have and EXACTLY what I was looking for! 70 ft-lbs it is. Thanks!

Glad I could help! But I owe my info to Google! ..... Google is awesome, do they sell stock??

5-90:
You have a point. My machinists (2 for my last 2 builds) did specify torque for the rods. Over/under torquing a rod or main journal can distort the rod (or block) differently and affect the bore size. We're talking tenths (0.0001), but it can make a difference. I could look up the (Buick 455) info if you're interested....

[SilverXJ]

Keep i mind that the ARP torque number is usually with their lube.

[Retlaw01XJ]

Keep i mind that the ARP torque number is usually with their lube.

And don't use ARP lube on other bolts... you will overstretch them.
ARP lube reduces friction. If you torque one bolt to 70 ft lbs with ARP lube, and another bolt to 70 ft lbs using plain oil, the ARP bolt stretches more and has more clamping force.
Use ARP lube on say, a head bolt and torque to 110 ft lbs, and you will over stretch it due to the reduced turning friction!

[SilverXJ]

Keep i mind that the ARP torque number is usually with their lube.

And don't use ARP lube on other bolts... you will overstretch them.

x2. Also, use the ARP lube sparingly and wipe off any excessive after installing the bolts as there is some form of an abrasive in the lube.

[5-90]

YOU DA MAN!!!
70-lbs it is! That is EXACTLY what I have and EXACTLY what I was looking for! 70 ft-lbs it is. Thanks!

Glad I could help! But I owe my info to Google! ..... Google is awesome, do they sell stock??

5-90:
You have a point. My machinists (2 for my last 2 builds) did specify torque for the rods. Over/under torquing a rod or main journal can distort the rod (or block) differently and affect the bore size. We're talking tenths (0.0001), but it can make a difference. I could look up the (Buick 455) info if you're interested....

I do know that screw preload is a factor, but I'd always thought it was more a matter of bearing crush than tensile preload on connecting rods. Don't know how I screwed that one up!

I probably /have/ specs for all three of the 455 engines (BOP) socked away somewhere - I was looking up torque specs for someone for an old Chrysler "straight-eight" about a fortnight ago (much to my surprise, I had them in a notebook! I haven't even /seen/ a straight-eight in the last 25 years...