[Vwdiesel] TDI tires

[Val Christian]

Actually we use N2 in aircraft tires, expecially ones which get hot and 
go high (turbine).  There are reasons for it, which escape me at the 
moment.  It's not all about the N2 tank, because the N2 molecules are
larger, and leak less.  The N2 is relatively inert, and does not 
oxydize rubber coumpounds at higher (hot landing) situations.  The N2
is dry, and keeps moisture out of the system, which reduces corrosion,
especially without O2 present.

Also the FAA has issued ADs (Airworthiness Directives) requiring N2
for tires in certain aircraft.

If Nick would just put balloon tires on his Silverado, then he could 
float over heavy traffic with the He fill.  Or he could take a whiff
of the stuff before officer friendly comes to the window, so he can 
charm with his Donald Duck talk.

> 
> I say go with helium.  :)
> 
> Nick
> 
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of James Hansen
> Sent: February 29, 2012 12:24 PM
> To: LBaird119 at aol.com; Vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] TDI tires
> 
> There is so much nonsense flying around this nitrogen in tires bit, it's a
> big tires sales gimmick.  The ONLY measurable advantage you get is the fact
> that it is DRY gas going in to the tire, not carrying a level of humidity.
> Humidity levels in the tire exacerbate the change in pressure experienced
> when temperatures rise in use. So the tire droid wet mounts the tire with
> soap and water, away goes the advantage, then uses nitrogen to fill and acts
> like he's using space shuttle technology. 
> You can achieve the exact same results with using dry air, that has been
> dried on purpose through a dessicant or refrigerant dryer.
>   
> That said, we use nitrogen on the race cars, mainly because we can buy a
> relatively inexpensive tank of the stuff and not have to have another piece
> of equipment to maintain at the track to run air guns and fill tires, and it
> lasts 2 seasons per tank.  To fill properly, you need to fill, drain, fill
> drain, to purge the moisture from the interior to have any advantage
> whatsoever- it does not take much water in there at all. 
> If the hole is big enough to let out O2 and CO2, N2 will follow. Physically,
> yes, N2 is bigger, but we use these silly thin race tires, and they leak
> down through the sidewall over time same as with air. 
> 
> To use their logic, if you fill your tire, let all the small molecules leak
> out (no more than 20% is possible) then refill, you have concentrated the
> nitrogen in your tires.  Do it a few times, and you have nearly pure
> nitrogen in the tire, which you could then sell to the tire shop... hmmm.
> -james
> 
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of LBaird119 at aol.com
> Sent: February-29-12 11:06 AM
> To: Vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] TDI tires
> 
>  
> In a message dated 2/29/2012 3:26:28 A.M. Pacific Standard Time,
> toensing at wildblue.net writes:
> 
> The  benefit of nitrogen is slower loss of air as I am told nitrogen
> molecules are  larger than other air molecules.
> 
> 
> 
> 
> 
> I've always wondered just HOW much benefit there really is from  that, 
> considering the atmosphere is nearly 80% nitrogen.  I would think  moisture 
> content would have more to do with it than the fact that it's 20% more
> nitrogen.
>    Loren
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