What do YOU torque your ARP headstuds too?

[Gamble97]

I've seen people do 90ft/lbs, I've seen 95ft/lbs, I've seen 110ft/lbs.
What do you do?

 

[Calan]

Depends on the lubricant. Around 85 ft/lbs with ARP Moly lube; 120ish with 30w oil (IIRC).

 

[black_gst]

i did 95lbs with moly lube

 

[standard235]

I did 97 with Moly Lube.

 

[dsm-onster]

Depends on the lubricant. Around 85 ft/lbs with ARP Moly lube; 120ish with 30w oil (IIRC).

Ditto.

Never had a problem ever after many head swaps with the same studs wen using 30weight at stagest up to 120ft-lbs. Torque in 4 stages. With a large gap between the 3rd and last.

 

[99gst_racer]

It depends on the stud diameter (6-bolt and 7-bolt do have different recommended torque values), the lubrication used, and the stud material.

When I ran standard 11mm ARP's, I torqued them to 80 ft/lbs using moly lube.
With my 11mm ARP L19's, I have them torqued to 100 ft/lbs using moly lube.

 

[Calan]

95+ on standard ARP's and moly lube seems high to me. Just go with the recommended values on the data sheet that comes with the studs.

 

[99gst_racer]

95+ on standard ARP's and moly lube seems high to me. Just go with the recommended values on the data sheet that comes with the studs.

Agreed. The manufacturer usually knows best.


If anyone has a few minutes to kill and is interested in reading why torquing to 95+ ft/lbs w/ moly is a horrible idea, read this: http://www.dsmtuners.com/forums/bolt-tech/381426-fastener-tech-101-a.html

 

[Gamble97]

Ah wtf, I used the moly lube that came with it and did 30/60/90ft lbs. I didn't know anyone used 30w oil and could go higher. I may go 95 or 100lbs to be safe, not sure yet. Btw these are 6bolt studs.

 

[Calan]

Ah wtf, I used the moly lube that came with it and did 30/60/90ft lbs. I didn't know anyone used 30w oil and could go higher. I may go 95 or 100lbs to be safe, not sure yet. Btw these are 6bolt studs.

Going higher isn't "being safe". The bolts have a specific yield strength, and should be torqued to a certain percentage of that.

The different values for each type of lubricant is due to how they handle friction between the threads and mating surfaces. The net amount of pressure being exerted by the threads should end up being the same after torquing, theoretically.

 

[Gamble97]

Going higher isn't "being safe". The bolts have a specific yield strength, and should be torqued to a certain percentage of that.

The different values for each lubricant is due to how they handle friction between the threads and mating surfaces. The net amount of pressure being exerted by the threads should end up being the same after torquing, theoretically.

Damn you are smart. I will leave them alone then.

 

[Calan]

Damn you are smart...

Nah... I just read a lot and stay at Holiday Inn Express whenever possible.

 

[Calan]

Agreed. The manufacturer usually knows best.


If anyone has a few minutes to kill and is interested in reading why torquing to 95+ ft/lbs w/ moly is a horrible idea, read this: http://www.dsmtuners.com/forums/bolt-tech/381426-fastener-tech-101-a.html

Excellent article Paul! (Should be moved to the tech articles though...I never would have found it )

 

[99gst_racer]

Excellent article Paul! (Should be moved to the tech articles though...I never would have found it )

Thanks, and good call. I'll copy it over there right now.