Metal valve stems??

Posted By: R_Blaha

Metal valve stems?? - 05/04/10 03:21 PM

I bought a set of bogarts used and they have rubber valve stems. My question is I thought to run at a NHRA track you needed the metal valve stems, is this still true? I know these wheels went 10.69 @ 133mph with no problems but I don't know if it was a IHRA track or NHRA. I plan on running at a NHRA track. Thanks

Posted By: 9 Sec Phill

Re: Metal valve stems?? - 05/04/10 03:23 PM

Put them in anyway...

Posted By: maximum entropy

Re: Metal valve stems?? - 05/04/10 03:40 PM

Quote:

Put them in anyway...

Posted By: dave571

Re: Metal valve stems?? - 05/04/10 03:50 PM

I'm pretty sure you would need them by the rules at that kinda speed.

I think that stems are commonly missed by the tech guys. I think mine have been checked once.

Worth installing

Posted By: Blucuda413

Re: Metal valve stems?? - 05/04/10 04:34 PM

You should be able to get them at your local NAPA store. The short style are much cheaper there than the mail order houses.

Posted By: W.I.N. Racing

Re: Metal valve stems?? - 05/04/10 09:23 PM

Metal screw in valve stems, front and rear quicker than 12.00sec. dem's the rules

Posted By: ProStDodge

Re: Metal valve stems?? - 05/04/10 11:03 PM

/w what he said!

Metal stems needed at 11.99

2010 NHRA

5:1 TIRES
Tires will be visually checked for condition, pressure, etc. and must
be considered free of defects by the technical inspector prior to any
run. All street tires must have a minimum of 1/16-inch tread depth.
Temporary spares, space saver spares, farm implement or trailer
tires prohibited. Metal, screw-in valve stems mandatory in tubeless
tires, front and rear, on vehicles running 11.99 or quicker.

Posted By: RodStRace

Re: Metal valve stems?? - 05/05/10 01:40 AM

Okay, real stupid question here...
"Metal, screw-in valve stems"
I've seen plenty of metal stems, but they all seemed to be the nut and rubber washer style.
They don't "screw-in" to the wheel.

Am I mis-reading?

Posted By: jst19600

Re: Metal valve stems?? - 05/05/10 03:01 AM

Ive got tubes in my fronts so i dont need a metal valve stem.Verified this with the division 5 director.

Posted By: pro6pakRR

Re: Metal valve stems?? - 05/05/10 05:54 AM

But if I'm right,when I was SFI cert inspector,the tubes had to have metal valve stems. A lease in Div 3

Posted By: ProStDodge

Re: Metal valve stems?? - 05/05/10 07:37 AM

Quote:

Okay, real stupid question here...
"Metal, screw-in valve stems"
I've seen plenty of metal stems, but they all seemed to be the nut and rubber washer style.
They don't "screw-in" to the wheel.
Am I mis-reading?

RodStRace - no such thing as a stupid question!

The valve stem you are referring to are the proper ones - I suppose it would be more correct to specify "bolt-on" or "screw-on". But in effect they need to have a metal body and mechanical attachment.

The reasoning for the metal valve is to reduce the chances of something breaking the valve stem loose (or dry-rotting off). I remember back in the days of being a tire/battery guy, we used to knock the old rubber ones out with a single whack from the side rather than trying to pull them out. A little side pressure cuts'em right off!

Pro6pakRR - current wording would indicate otherwise.

"Metal, screw-in valve stems mandatory in tubeless tires"

Scott

Posted By: pro6pakRR

Re: Metal valve stems?? - 05/05/10 08:00 AM

what's it say about tube's?

Posted By: R_Blaha

Re: Metal valve stems?? - 05/05/10 02:39 PM

Cool thanks for the replys, I will have to switch them out, I'm in the 11.80's with a drag radial on this car.

Posted By: ProStDodge

Re: Metal valve stems?? - 05/05/10 03:29 PM

Quote:

what's it say about tube's?

I found nothing mentioning anything about tubes in all of ET (pro, super pro, sportsman), Stock/Super Stock, S/G, or general regs.

The above quoted 5.1 tire reg was pasted in its entirety from the general regs.