Community Forums

buddy110 · 03-31-2023, 12:18 PM

Anyone researched cost etc of replacing the air in our tires with nitrogen? It's more stable and does not change pressure with temps. All my BMW's have it. I hate checking my pressures every trip.

Gooma · 03-31-2023, 12:22 PM

The air we breath is 78% nitrogen. If you want to pay for the remaining 22%, go for it.

wolfe10 · 03-31-2023, 12:29 PM

Quote:

Originally Posted by buddy110

It ....does not change pressure with temps.

Then your BMW has found a way to OVERCOME PHYSICS!

Nitrogen, like all gasses follows the Ideal Gas Law (PV=nRT).

Will there be less PSI change for a given temperature change for Nitrogen than "wet air"? Sure, as water is not a gas.

Very little difference in PSI change for a given temperature change for Nitrogen compared with dry air.

Old-Biscuit · 03-31-2023, 12:44 PM

N2 ....BMW plausible

N2.....RV -------- WHY?

Besides....if the RV tires need adjusting you will end up using AIR cause few places have N2 stations

Arch Hoagland · 03-31-2023, 12:55 PM

Quote:

Originally Posted by Old-Biscuit

N2 ....BMW plausible

N2.....RV -------- WHY?

Besides....if the RV tires need adjusting you will end up using AIR cause few places have N2 stations

I saw a gas station here in Clovis California that had a nitrogen fill station. I was driving at the time and didn't see what, if any, was the price to use it.

I'll try to find the place again and check it out, I'm curious too what the cost is although I'll never use it.

jaydee325 · 03-31-2023, 12:58 PM

So nitrogen alleviates the effort of checking tire pressure before each trip? You have the wrong concept there. What if you pick up a nail? Or, valve stem o-ring fails, or valve core leaks.

Not running tire pressure monitoring system?

In my opinion, the only people making out on filling tires with nitrogen are the marketing folks!!

buddy110 · 03-31-2023, 12:58 PM

Quote:

Originally Posted by Old-Biscuit

N2 ....BMW plausible

N2.....RV -------- WHY?

Besides....if the RV tires need adjusting you will end up using AIR cause few places have N2 stations

But theoretically, they should not change much if any

buddy110 · 03-31-2023, 01:03 PM

Quote:

Originally Posted by Arch Hoagland

I saw a gas station here in Clovis California that had a nitrogen fill station. I was driving at the time and didn't see what, if any, was the price to use it.

I'll try to find the place again and check it out, I'm curious too what the cost is although I'll never use it.

You have to evacuate all the air first then fill. The actual fill isn't expensive, but the purge process is tricky

Quote:

Originally Posted by jaydee325

So nitrogen alleviates the effort of checking tire pressure before each trip? You have the wrong concept there. What if you pick up a nail? Or, valve stem o-ring fails, or valve core leaks.

Not running tire pressure monitoring system?

In my opinion, the only people making out on filling tires with nitrogen are the marketing folks!!

I monitor my pressures all the time. On more than one occasion I have had to bleed off excess pressure while driving in the extreme heat, then recheck and often refill in the morning. I'm just a bit lazy and I love the convenience of not hauling out the compressor and filling tires. Perhaps I should just bite the bullet and get an air doubler.

Old-Biscuit · 03-31-2023, 01:07 PM

Quote:

Originally Posted by buddy110

But theoretically, they should not change much if any

Wrong concept

4 myths about N2 and tire inflation
https://www.aaa.com/autorepair/artic...late-car-tires

Great of you have an Airplane or Race Car

wolfe10 · 03-31-2023, 01:08 PM

Quote:

Originally Posted by buddy110

On more than one occasion I have had to bleed off excess pressure while driving in the extreme heat.

Wow. Would love to see a tire manufacturer's recommendation to bleed off pressure due to driving (assuming not a huge increase in ambient temperature between before driving and while driving).

Said another way, the tire engineers all know what the PSI change will be for a given temperature rise (because of driving and/or increase in ambient temperature).

That is why all tire manufacturers specific recommended PSI when cold, where cold= before driving at current ambient temperatures.

SteveJ. · 03-31-2023, 01:10 PM

Quote:

Originally Posted by buddy110

You have to evacuate all the air first then fill. The actual fill isn't expensive, but the purge process is tricky

I monitor my pressures all the time. On more than one occasion I have had to bleed off excess pressure while driving in the extreme heat, then recheck and often refill in the morning. I'm just a bit lazy and I love the convenience of not hauling out the compressor and filling tires. Perhaps I should just bite the bullet and get an air doubler.

Quit bleeding them off unless the cold pressure is too high due to relocating from the tundra to someplace warm in the winter. Daily bleeding due to pressure rises from running them is not recommended anywhere that I have seen. In fact, it is recommended that you do not do that.

buddy110 · 03-31-2023, 01:12 PM

Quote:

Originally Posted by wolfe10

Wow. Would love to see a tire manufacturer's recommendation to bleed off pressure due to driving (assuming not a huge increase in ambient temperature between before driving and while driving).

Said another way, the tire engineers all know what the PSI change will be for a given temperature rise (because of driving and/or increase in ambient temperature).

That is why all tire manufacturers specific recommended PSI when cold, where cold= before driving at current ambient temperatures.

Yes, and in fact my pressures were set cold both times per weigh in and Michelin tire guides. That said the temps were in the 100's driving at ~65 mph. Both times it was the rear, not front tire which signaled high pressure.

Good info from all
Thanks

buddy110 · 03-31-2023, 01:16 PM

Quote:

Originally Posted by SteveJ.

Quit bleeding them off unless the cold pressure is too high due to relocating from the tundra to someplace warm in the winter. Daily bleeding due to pressure rises from running them is not recommended anywhere that I have seen. In fact, it is recommended that you do not do that.

Well the alternative was to drive over inflated, so I bled them down.

I raced for years in road race circuits. Bleeding off or adding pressure was a pit stop routine. A hot tire is not only greasy, (losing grip) they can explode. I realize the RV world is a different animal, thus my question for the board.

SteveJ. · 03-31-2023, 01:22 PM

Quote:

Originally Posted by buddy110

Well the alternative was to drive over inflated, so I bled them down.

I raced for years in road race circuits. Bleeding off or adding pressure was a pit stop routine. A hot tire is not only greasy, (losing grip) they can explode. I realize the RV world is a different animal, thus my question for the board.

The definition of over inflated is the pressure being more than the recommended at ambient temperature. The tires are engineered with the specific thought that they heat up and pressures increase as they are used. This is baked into the design. By deflating them once under way you are actually running the tires under inflated.

I'm not gonna do the leg work but do yourself a favor and do the research. We are not running in a race with racing compounds.