I still say it is what they painted the rims with as they mounted the
tires. Maybe not the 'magic goop' I referenced, but just a better brand
of the regular clear goop, or some lube concoction they mix up on their
own. I have never seen a tire mounted completely dry- that is a LOT of
friction to overcome. And there are clean rims, and CLEAN rims. A
half-hearted swipe with a brush, or maybe blowing compressed air around
it, versus a close inspection with eyes and fingertips to find any rough
areas that need another pass with the wirebrush to get the grunge off.
In the old days, Mercedes used to call out for repainting the rims, in
their tech manual.
You don't have to "remove the oxygen first.Think of a glass of fluid, mostly
water with some 20% gatorade now take pure water and add it to the glass until
it over flows, continue pouring for an other 30 seconds. Will the glass be pure
water? likely not, but will it contain very much gatorade? I think not. The same
is true with gases. If you fill a container with NO2 it will displace all the
other gases. Could there still be some oxygen hiding in your container? Yes of
course. But if you take the gas and change it from 21% O2 to maybe 1% or 0.5%
that is a huge improvement.
I think he is using the overflow analogy incorrectly but his point is
the same. If the tire is at one atmosphere with air, you fill it to
proper pressure and the original 20% oxygen is now diluted to about 1/30
of its total content.
I guess you can fill the tire, let it deflate and fill it again to purge
Personally, I use a secret blend of gasses in my tires. It has argon
and carbon dioxide too. For $10 each I'll fill yours.
Well, I wasn't talking about tires. I thought this thread was about preserving
food with inert gases, but since you asked. One could easily use the same
process that home brewers use to clear the O2 out of the head space of a keg
before carbonating their beer. In short, pressurize and depressurize in quick
succession. if you double the pressure with pure NO2 (which isn't much, standard
atmosphere is about 14.7psi, so only about 30 psi) then drop back to no pressure
differential then fill once more you'd already be above 90% pure NO2.
1% Argon, CO2 many others
so your tire starts at 78 parts Nitrogen. double the pressure, it's reasonable
to assume you've added 100 parts nitrogen. depressurize, cutting each components
presence by half. 178 parts out of 200, becomes 89 out of 100. once you
pressurize it again back to tire pressure 32-45PSI you are well above 90%. you
can never get to 100% this way. but if you do the math it takes 5 successions to
get above 99%. Are most tire shops venting tires to attain high purity of gases
in tires? Probably not. I never have promoted it's use in tires any way. But,
one thing that hasn't been mentioned: Nitrogen for tires is guaranteed dry air.
if you live in a humid climate and the compressor has run all day and hasn't
been drained, you better believe that the air they are pumping into your tires
is saturated with water. using NO2 is one way to be sure they're not introducing
water into your tire and rim assembly.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.