ARP head studs
Thread Starter
warm butter on toast
Joined: Jan 2005
Posts: 6,485
Likes: 0
From: The boonies, CT
ARP head studs
These instructions are confusing me. They're for a B16a, the instructions say:
[A] Torque values are based on 75% of the fasteners yield strength. Use the manufacturers torque sequence but do not use the engine manufactureres torque specs. Torque the nuts to 70ft lbs.
[B] Due to the expansion rate of ALUMINUM, it is recommended that the torque should be 65ft lbs.
So which do I number do I go by 70ft lbs or 65ft lbs?
[A] Torque values are based on 75% of the fasteners yield strength. Use the manufacturers torque sequence but do not use the engine manufactureres torque specs. Torque the nuts to 70ft lbs.
[B] Due to the expansion rate of ALUMINUM, it is recommended that the torque should be 65ft lbs.
So which do I number do I go by 70ft lbs or 65ft lbs?
Last edited by Omniscient; Sep 16, 2006 at 12:11 PM.
On permanent hiatus
Joined: Jul 2004
Posts: 9,716
Likes: 0
From: A forum with actual tech
My Golden Eagle studs had to first be torqued to 25 ft/lbs, then stretched by loosening and tightening them one by one three times to 50 ft/lbs, and then a final torque value of 75 ft/lbs. I think the ARP are the same way, but I am not sure. 65 ft/lbs seems low since the OEM torque value is 60 ft/lbs.
Junior Member
Joined: Feb 2005
Posts: 214
Likes: 0
From: Northern Virginia
turning u inside out
Joined: Oct 2003
Posts: 2,545
Likes: 0
From: cortland, ohio
My Golden Eagle studs had to first be torqued to 25 ft/lbs, then stretched by loosening and tightening them one by one three times to 50 ft/lbs, and then a final torque value of 75 ft/lbs. I think the ARP are the same way, but I am not sure. 65 ft/lbs seems low since the OEM torque value is 60 ft/lbs.
On permanent hiatus
Joined: Jul 2004
Posts: 9,716
Likes: 0
From: A forum with actual tech
No.
Torque them to 25 ft/lbs and then torque to 50 ft/lbs. One at a time, loosen 1/2 turn, then re-torque to 50 ft/lbs. Do this 3 times per stud and then do a final torque to 75 ft/lbs. Keep in mind, this is all done in the normal criss-cross fashion working your way out.
Torque them to 25 ft/lbs and then torque to 50 ft/lbs. One at a time, loosen 1/2 turn, then re-torque to 50 ft/lbs. Do this 3 times per stud and then do a final torque to 75 ft/lbs. Keep in mind, this is all done in the normal criss-cross fashion working your way out.
EG6
Joined: Jan 2005
Posts: 1,159
Likes: 0
No.
Torque them to 25 ft/lbs and then torque to 50 ft/lbs. One at a time, loosen 1/2 turn, then re-torque to 50 ft/lbs. Do this 3 times per stud and then do a final torque to 75 ft/lbs. Keep in mind, this is all done in the normal criss-cross fashion working your way out.
Torque them to 25 ft/lbs and then torque to 50 ft/lbs. One at a time, loosen 1/2 turn, then re-torque to 50 ft/lbs. Do this 3 times per stud and then do a final torque to 75 ft/lbs. Keep in mind, this is all done in the normal criss-cross fashion working your way out.