The obsessed people have already changed their oil at 70% so looking at something else to obsess about with their carAre you contending that pure nitrogen behaves differently than air due to temperature swings? Because if you are you need to go back to school bud.
The only theoretical advantage of pure nitrogen is that it might lose less air mass to leakage over time, but that is dubious.
Any and all variance in pressure in your tires day to day is due to temperature of the gas in the tires.
Air being 98% oxygen and nitrogen those are the only 2 molecules we really care about.The obsessed people have already changed their oil at 70% so looking at something else to obsess about with their car
Ian as you are an engineer, random side question on this nitrogen thing. If the theory of nitrogen in tires is that the nitrogen molecule is larger and therefore doesn't "leak out" of the tire like the oxygen molecule then over time, wouldn't all of our tires slowly increase the nitrogen %? We start at 78. If a little oxygen leaks out then we might be at 83%. We add a little more 78% air but we are still at 81% let's say on a blended basis. Then more oxygen leaks out and now we are at 85%. So over the long term (until we have a tire change) we get even more than 78% nitrogen naturally.
Is that true or is it incorrect that some of the gases leak out but nitrogen is less likely to?
Helpful and makes a lot of sense. Given the sizes you mentioned I agree that it wouldn't be the case that somehow oxygen just leaks out of the rubber. So we are talking general leakage. Which then really negates whatever rationale someone baked up for "Nitrogen Fill"Air being 98% oxygen and nitrogen those are the only 2 molecules we really care about.
Oxygen is only 3% smaller, so it really can only be a totally negligible difference in passive leakage due to the molecular size. Some nitrogen snake oil salesmen will tell you it's important...
I don't have any scientific data to back this up, but I would wager a good amount of money that the top 2 sources of air mass loss in a tire are leaks at the valve stem, and hitting potholes where the sidewall bead momentarily separates from the rim. Neither of those scenarios matter if you have a 300 picometer molecule or a 292 picometer molecule.
In the scenario where oxygen leaks but nitrogen does not, yes what you are describing about net nitrogen percentage increase would be true.
If there was any truth to the lower seepage due to larger molecules we would be filling our tires with argon, which is a much larger molecule than both nitrogen and oxygen.
Nitrogen filling tires is snakeoil. Hoax. Scam. Doesn't work.I never had this issue with Nitrogen
OK Question
I had 2 pilots and both had nitrogen in tires , got MDX Type S and no Nitrogen in tires , I asked the dealer and they told me they do not believe in it, so question, do you do yours come with it and how hard is to change it to nitrogen, my tire pressure is all over the place mornings 34-36 afternoons 42 winters drops as low as 28 PSI it drives me nuts I never had this issue with Nitrogen
That's the first great explanation about my fluctuationsThe major advantage in using nitrogen is that it's dry. The moisture in the air is what contributes to most of the pressure fluctuation with temperature. Service stations with large compressed air tanks rarely blow down the moisture.
