I'm in mid re-assembly and can't seem to find the torque setting for the bolts that hold the headers to the head. Does anyone know?

Thanks

 

C'mon guys I know someone has the answer.

 

Don't know for sure, but 22 ft/lbs should be plenty making sure you tighten them in the correct order starting in the center, up and down. Then loosen them up in the reverse order and tigten them down again to 16 ft/lbs.

 

Send a PM to Stephen @ Imagine Auto. He will supply the correct information to you. If you still have a problem e-mail me and I will ask Rob @ S Car Go Racing for you.

 

Tighten to 25Nm (that's 19 ft/lbs) but definately don't overtighten as the bolts from Porsche are pretty weak and have seen them break the head off even at 19lbs with a properly calibrated click type snap on torque wrench. A higher grade fastener is preferable. Problem is that there is so much heat there that it tends to weaken the bolts over time (like the old 911 exhaust studs)

 

Oh, BTW, it is a good idea to replace the exhaust manifold gaskets while you're there (and make certain they are on correctly-it is possible to put them on with the gasket off-center of the port)- if the gasket leaks at all that will throw false air into the exhaust stream and give you a CEL.

 

18 ft/lb with Wurth copper paste.

 

Opps

 

Gotta love this Board! Thanks Guys!

 

An 8x1.25 typical German exhaust stud with nut is 18 to 20 ft/lbs.

For some reason Porsche uses a bolt. Which likely needs slightly less due to less stretch. IMO 18 ft/lbs is a good value.

Trivia Question:
Why does Porsche use a bolt instead of a nut with a stud?

Jeff

 

18Ft lbs with anti seize. offical value from Porsche.

Porsche moved to a bolt for better toque pattern and less chance of breaking. All of the earlier cars used studs which would erode at the half or seize the nut to it and snap. The larger bolts gives a better opportunity to remove it. Remember to tighten it first, then loosen it.