I'm Considering Nitrogen vs Air Again

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726
Location
EU
Colour coding of cylinders for a modern shop in general is the most critical. Can't have LiquiMoly's "Leichtbau Reifenfüllgas" with advanced chemistry filled in just some tires of a vehicle and 80 or 95% Nitrogen in others at the same time. Alternative fills without approvals are probably even illegal for uses other than far from public roads youtube.com/watch?v=LRMDTzPIXfo#t=1m44s
 
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507
Location
South Carolina
Oxygen probably doesn't leak out any faster, it just gets absorbed by the oxidation of the tire rubber. Nitrogen acts somewhat like an inert gas and doesn't readily combine with rubber.
 
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327
Location
Pennsylvania
If tires leak air but not nitrogen, then we have invented a very inexpensive gas separator. Fill it with air, then according to this idea, everything but nitrogen will leak out, top of with air again, everything but nitrogen will leak out. At this point you are 90+% nitrogen for free.....
 
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744
Location
USA
Hello,

When the tires on one of my previous cars became over 5 years old, I had to add air to them more often than I wanted to because it slowly leaked. Then I was suggested to use nitrogen and it helped a lot. I only needed to get them topped off 2x a year after a while, with nitrogen. Then I got rid of that car and got a car that I put a new set of tires on, and the tech told me that air will work just fine on these tires and it did.
But then I traded that car also and the car I have now has Goodyear Assurance tires that have maybe 30k miles left on them. I put 40 PSI in them and I noticed the other day that after about 3 months, I now have 36 PSI when the tires are warmed up after driving the car. I seemed to lose about 8 PSI. So again, I'm thinking of running nitrogen so it will hold the PSI for longer periods of time. I only drive the car about 4k miles a year, so these tires could last me 7 years. It will cost me about $20 + tax for nitrogen in 4 tires, with free top offs if needed. Or maybe the tires won't leak much more and will stay in the mid 30s PSI.
Any thoughts on this without condemning me for using nitrogen? It seems that older tires don't hold the PSI like new tires do, and I only drive 4k miles +/- a year so I tend to have older tires on my cars lately. I think it will be well worth the $22 to get it and have more stable PSI in the next 5+ years on these tires.

Air is about 75-80% nitrogen 🤷‍♂️
 
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7
one key can be moisture in the air being compressed. a lot of places do not have air dryer inline on their compressor. more moisture...the higher the affect of ambient temperature will have on the pressure. Nitrogen systems have a dryer as well as high end air systems. go to a place connected to a body shop, they have to have dry air to paint. see if that achieves the same performance that you got from nitrogen.
 
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1,534
Location
iowa
I've owned a N2 generator since 2005, and I will never fill any of my 11 sets of tires, or the thousands of other tires I've filled with wet compressed air. Might not be much of a difference, but it is better no matter how you slice it. Oxygen has zero benefit when it come to tires, inside, or out.
 
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3,195
Location
Western S.C.
Initial fill: 78%
2nf fill: 95.2%
3rd fill: 98.9%
All for free.
Only if all the oxygen magically vanishes between fills.
That's impossible, because the equilibrium vapor pressure of oxygen in the tire will never fall below that in ambient air, roughly 3 psi. Therefore, no matter how many times you add air, or how long you wait, outward permeation of oxygen will never raise the percentage of nitrogen above about 92% , assuming typical car tire pressure.
 
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2,138
Location
Somewhere in time
Only if all the oxygen magically vanishes between fills.
That's impossible, because the equilibrium vapor pressure of oxygen in the tire will never fall below that in ambient air, roughly 3 psi. Therefore, no matter how many times you add air, or how long you wait, outward permeation of oxygen will never raise the percentage of nitrogen above about 92% , assuming typical car tire pressure.
Sweet.
 
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391
Location
Greenville SC
I've owned a N2 generator since 2005, and I will never fill any of my 11 sets of tires, ...
I'm curious of the details on your N2 generator. What brand is it? How pure is the N2? What is the moisture content? Do you feel that water or O2 is the more significant a problem with "nasty" compressed air?
 
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