ARP main stud torque?

[87we410877]

I am about to get my motor line honed. I know its good practice to torque your caps to the same # that it was line honed at. I have ARP studs and 4 billit main caps w/ a gurdle. What should i torque the mains to and using what lubricant? I will probably use 10-30 oil. This is for a motor pushing for 700-750 HP if that matters. CAT forged crank also. . Thanks alot.

 

[buickpower]

I'd use the moly lube on the studs, slicker than oil for more consistency. Unfortunately someone else will have to chime in on the torque specs.

 

[Jerryl]

..........I have ARP studs and 4 billit main caps w/ a gurdle. What should i torque the mains to and using what lubricant? ........

If you completed a search (As I did at one time), you would find lots and lots of info, but, in the end (after putting it all together) you end up following more than likely, the MFG recommended specs.

Based on that, I would contact ARP and explain your goal. I am sure they can provide the answers.

 

[Lee Thompson]

this will work good

90 Ft. Lbs. with ARP lube
Do not take ARP or your machinest torque values--use 90 with ARP lube.

 

[87we410877]

90 Ft. Lbs. with ARP lube
Do not take ARP or your machinest torque values--use 90 with ARP lube.

Ok. I will do that. I did a search and theres like 50 different torques using 100 different lubes. Ill take 90 w/ ARP for a burn. Thanks alot.

 

[bison]

Bob at RPE just did one for me with a girdle and he stamped the torque numbers on the girdle. 25 perimeter and 90 mains with ARP. I think it is very important to use a good moly lube like ARP. If the fasteners are new, they should be torqued, broken loose and retorqued 2-3 times to polish the surfaces. Then the line bore and hone can be done. Its important that the fasteners are torqued the same way they were when the line lone was done. You can feel a big difference when using ARP moly vs. oil when you come near your desired torque #. The technique the assembler uses when torqueing can have an effect on the load. It must be a smooth turn of the wrench without stopping or jerking especially when you get near the torque you desire. Breakaway torque is always more than the torque value you applied because of starting friction.

 

[Jerryl]

90 Ft. Lbs. with ARP lube
Do not take ARP or your machinest torque values--use 90 with ARP lube.

DAMN! That could be a problem for me.
Lee, same numbers for ARP bolts?

 

[Lee Thompson]

I don't know!!!

I have NEVER used the factory bolts (over) or ARP bolts. The few eng. that I have assembled, I replaced the bolts with studs. I do believe factory specs are 100 ft lbs with bolts. So actually 90 with ARP lube is a little on the high side but just what I have always used. We also over torque the heads somewhat. Who runs the factory 12 psi? Notice I said assembled not BUILD. IMO there is a major difference between an eng. builder and someone like me who only assembles. Best of luck.