Log in

View Full Version : Re-torquing ARP headstuds

Pages : 1 2 3 4 [5] 6 7 8
scheides
05-12-2009, 10:25 PM
Just get the A1 L19 studs and follow the directions that come with them. They are cheap for the Evo/7-bolt compared to 400-500 for a 6-bolt or 600-800 for a Supra.

IMO, I'd really assess your goals with this car. Will you really be taking advantage of the L19's or would you be alright with regular arps?

IDK, 400whp is about my limit w/o building the motor, and I don't really plan on doing much more than where I'm at.

Damn it shane, really?
4g63tcrazy
05-12-2009, 10:37 PM
L19's! L19's! L19's! L19's!
niterydr
05-13-2009, 07:38 AM
I assume you are using the right TQ spec? They are different for which type of lube you use. You can also try a slightly higher torque. We found it effective on Josh's car at delaying head gasket failure to a higher HP level.

You may want to lossen the nuts up and take them off just so you can besure they are nice an lubed up.

Yeah it helped to keep the heads from lifting, which was actually the failure, not the clamping force of the studs. The difference between 78 to 95 to 110lb/tq was huge.

Chris,

I'd say if you are already pushing coolant you won't stop it. The "path" has been found and it is exponentially weaker now. I would suggest to pull it apart, make sure your surface roughness value of the block and the head is what your head calls for, and put it back together. Typically ARP rates their fasteners at 75% yield strength.

Or go with a stronger (higher tensile strength) head stud.
scheides
05-13-2009, 09:02 AM
How is surface roughness measured?
Mwolf83
05-13-2009, 09:06 AM
With a RA tester. Go to a machine shop and they should have one. They arent cheap so they might be hard to find one. The shop I work 4 has them and they are $2000+.
scheides
05-13-2009, 09:10 AM
Also, I bought the ARPs as 'the last set I'll ever need' and now look what happened. Why should I waste my time and $$ on these L19's?

Shane, what headstuds were in that 700whp evo?
scheides
05-13-2009, 09:12 AM
With a RA tester. Go to a machine shop and they should have one. They arent cheap so they might be hard to find one. The shop I work 4 has them and they are $2000+.

Is this something mobile? I mean not like I'm gonna wheel the car down there....
Halon
05-13-2009, 10:11 AM
OK keeping that mindset, why waste time and $$ on more of the same ones your having problems with right now?

You have all the info at your finger tips, it's your call dude.
Shane@DBPerformance
05-13-2009, 11:21 AM
Also, I bought the ARPs as 'the last set I'll ever need' and now look what happened. Why should I waste my time and $$ on these L19's?

Shane, what headstuds were in that 700whp evo?

AMS L19s. Same as Titan, A1, etc.

Cometic headgasket. No ghetto copper spray. No O-rings.
Mwolf83
05-13-2009, 11:40 AM
Is this something mobile? I mean not like I'm gonna wheel the car down there....
Yes it is mobile, fairly small actually. You can google it (not many results, but they are there, pics I mean)
Here is a link to a pic:
http://pracownia.mechaniki.com.pl/info/2_jakosc/graphics/chropowatosciomierz.jpg
they come in all shapes and sizes.