What is the word on lubrication of wheel studs for race cars?

[GUMBALL]

Originally Posted by winders

Maybe all the fasteners are specified to be installed "wet" on an Indy car. That is not the case with a Porsche street car setup for racing.

A racecar is a racecar is a racecar . . . . . .

[dannobee]

Originally Posted by Walt Fricke

... But how do NASCAR with their glued on nuts approach stud lubrication? ...

No lube on wheel studs. Minimum torque is 40 ft lbs, but that rule changed, then changed back. Spec for our 5/8-11 studs was 140 ft lbs, the minimum torque rule was only to keep tire changers from saving fractions of a second by letting the gun hammer once or twice instead of enough to fully torque the lug nut.

As you know, we glued our lug nuts on with weatherstrip adhesive for green flag pit stops. Lug nuts were 1" and used a special socket that allows engaging with the gun at full speed, with a spring to push out the lug nut. Teams could use double ended lug nuts (the tapered cone on both sides) to eliminate the chance of putting it on backward.

But this will all become a moot point as nascar said they will switch to one big nut for wheel attachment this year.

[mikePTH]

Originally Posted by dannobee

No lube on wheel studs. Minimum torque is 40 ft lbs, but that rule changed, then changed back. Spec for our 5/8-11 studs was 140 ft lbs, the minimum torque rule was only to keep tire changers from saving fractions of a second by letting the gun hammer once or twice instead of enough to fully torque the lug nut.

As you know, we glued our lug nuts on with weatherstrip adhesive for green flag pit stops. Lug nuts were 1" and used a special socket that allows engaging with the gun at full speed, with a spring to push out the lug nut. Teams could use double ended lug nuts (the tapered cone on both sides) to eliminate the chance of putting it on backward.

But this will all become a moot point as nascar said they will switch to one big nut for wheel attachment this year.

MSI studs/nuts for your team?

[dannobee]

Yes. Way back when it was ARP, then gradually migrated to MSI.

[Walt Fricke]

Dan - since all I "know" about NASCAR is pretty much limited to TV commentators, I appreciate your contributions here. I've tried to find NASCAR's rules on line, but haven't been able to. Working with PCA's Club Racing rules has me always a bit curious about other series (especially professional ones) with regard to safety rules.

I have wondered how glued nuts would work, but elastic weatherstrip adhesive answers that? Stretches enough to keep the nut on the bullet ended stud?

But center locks in NASCAR? First EFI, then this? What's next - IRS (like every production sedan nowadays)?

[safe]

Originally Posted by 962porsche

when it comes to putting any lube on a wheel stud , nut or bolt this is a DO NOT EVER DO THING!
1st is all auto makers give you a torque spec of a dry clean stud. lubing a stud nut or bolt will give you a incorrect torque and lead to an over torqued wheel fastener!

Obviously you haven't read the Porsche workshop manual. It clearly states that the threads and mating surface between the wheel and nut SHOULD be lubricated and torqued to 130 Nm.
On the newer (996+) Porsches with wheel bolts with an integrated kone-washer the lube should be applied between the the washer and bolt.

[911pcars]

Porsche TSB:


Name change:
Optimoly HT equivalent ?



A close facsimile seems to be Permatex Copper Anti-Seize.

Sherwood

[winders]

Originally Posted by 911pcars

A close facsimile seems to be Permatex Copper Anti-Seize.

Except that Permatex Copper Anti-Seize is a grease and certainly changes the torque requirements and Permatex specifically states in their Copper Anti-Seize TDS that it is not for use on lug nut or stud applications.

So, other than that, sure, it's a close facsimile.....

P.S. I have a hard time believing that the Optimoly HT or its replacement does not affect torque requirements regardless of what Porsche says in that bulletin.