Interest in Main Bearing studs - ZR-1 Net Registry Forums

tpepmeie · 11-22-2015

Most of you should have these by now. I realized I should provide some guidance for torque values. Using either oil or ARP ultra torque on the threads and washers, you should tighten to:

M10: 52 ft-lbs (in two steps)
M12: 80 ft-lbs (in three steps)

At those levels, you'll stretch the studs to approximately 75% of the yield strength. You'll want to put several (3-5) torque cycles on the fasteners to burnish the threads and stabilize the friction value.

Note: the fine threads on the nut end of the studs are not the same pitch as the OEM fasteners. You should not use the same torque-angle specification as the stock bolts. That will result in under torqued studs.

If you want to use torque-angle methods, contact me offline and I can provide the angles.

11-22-2015	#33
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 814	Re: Interest in Main Bearing studs Most of you should have these by now. I realized I should provide some guidance for torque values. Using either oil or ARP ultra torque on the threads and washers, you should tighten to: M10: 52 ft-lbs (in two steps) M12: 80 ft-lbs (in three steps) At those levels, you'll stretch the studs to approximately 75% of the yield strength. You'll want to put several (3-5) torque cycles on the fasteners to burnish the threads and stabilize the friction value. Note: the fine threads on the nut end of the studs are not the same pitch as the OEM fasteners. You should not use the same torque-angle specification as the stock bolts. That will result in under torqued studs. If you want to use torque-angle methods, contact me offline and I can provide the angles.