I'm pretty sure I have my facts straight. I spent wayyyy too much
time in school to mess up the basic stuff too bad. If you are so
certain something I wrote here is wrong, please back it up with
facts, references to textbooks, scientific journals and the like, or
mathematical evidence.
Les
--- In Diesel-RVs@yahoogro
>
> Go back to school Les!
>
>
> -----Original Message-----
> From: Diesel-RVs@yahoogro
RVs@yahoogroups.
> Behalf Of lshields20
> Sent: Wednesday, January 02, 2008 1:46 PM
> To: Diesel-RVs@yahoogro
> Subject: [Diesel-RVs] Re: 07 Toyota/Nitrogen
>
>
>
> I "think" the air loss through migration is mostly in one's
> imagination. If nitrogen did "migrate" through the tire more slowly
> than oxygen does, what would happen? Some oxygen would migrate
through
> the tire leaving the nitrogen behind. Add plain air to make up and
the
> process repeats. After several such episodes, what do you have left
in
> the tire? It would be nearly pure nitrogen. The process called
gaseous
> diffusion and is one method that can be used to enrich uranium for
> fissile purposes.
>
> Loss through the valve stem is much greater than through the "pores"
> in the rubber.
>
> I must have the best set of Michelins ever made on my 2004 Dutch
Star.
> For the first two years I owned it, I never added air (and I do
check
> them frequently). I have added air about twice since then. Both
times
> were to compensate for me reducing pressure while traveling in the
> south, then adding air to make up during cold months up north.
>
> I highly suspect the transition between summer and winter is the
main
> reason people find they need to add a couple pounds to their tires.
> The ambient temperature change between summer (say 80 degrees) and
> winter (say 20 degrees) is enough to cause a several pound change in
> pressure. At least a pound a month from summer to winter.
>
> I don't believe Costco is run by idiots. I think it is run by very
> good marketing people. If a store can provide a perceived value
> (whether or not it is an actual value) when selling a commodity item
> (a particular tire is pretty much the same no matter where you buy
> it), people are more likely to buy where they get the perceived
value.
>
> Les
>
> >
> > Then why does Costco fill all the tires they sell with nitrogen.
You
> > cannot buy nitrogen from them--it is only something they provide
at no
> > cost for their new tires. I don't believe that Costco is run by
idiots.
> > There must be some value. In my case, the only difference I've
seen
> is a
> > much, much lower of air loss due to migration. But that is a very
> > worthwhile difference for me.
> >
> > Bob Clerc
> > @ Casa Grande, AZ
> >
>
>
>
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1 comment:
Why not buy textbooks from online bookstore? I get 2 textbooks from a online bookstore and save me more than $200. All the textbooks are BRAND NEW. That's great. You may visit the web to see any help.
http://www.cocomartini.com/
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