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#2610101 - 04/26/12 05:27 AM Re: Nitrogen pressure fluctuation due to tempurature? [Re: hardcore302]
Garak Offline


Registered: 12/05/09
Posts: 12067
Loc: Regina, Saskatchewan, Canada
Originally Posted By: hardcore302
Well, turns out I got a nail in it.


There you go. I guess the simplest explanation tends to be the best one. It looks like you keep an eye on your tire pressure regularly. Therefore, if pressure goes down significantly between regular checks, you have a leak. wink

I did have a leak in the G, too, a couple months back. The TPMS was picky enough to catch it long before riding on a low tire was even an issue. After it went off, I monitored it closely. I was losing 1 PSI per day, when the other tires weren't. Therefore, a leak.
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#2610828 - 04/26/12 08:38 PM Re: Nitrogen pressure fluctuation due to tempurature? [Re: hardcore302]
hardcore302 Offline


Registered: 11/23/09
Posts: 2452
Loc: Suffolk County, NY
yep! I work accross from a junk yard. It's a mess over there. The dog is cool, though.
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#2611287 - 04/27/12 12:12 PM Re: Nitrogen pressure fluctuation due to tempurature? [Re: Quattro Pete]
George Bynum Offline


Registered: 12/18/04
Posts: 174
Loc: Greenville SC
Originally Posted By: Quattro Pete
Also, how has the shop extracted the existing air and moisture that was already in the tire before they started pumping in the nitrogen?
I asked the local Costco tire manager that soon after they started using their nitrogen concentrator. His response was that they use about as much from the tank flushing as filling.

Re the question on it being dry ... it is my understanding of the concentration process that the water vapor is removed by the same membrane process that removes the oxygen. BUT I DON'T KNOW.

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#2611559 - 04/27/12 06:04 PM Re: Nitrogen pressure fluctuation due to tempurature? [Re: hardcore302]
Shannow Offline


Registered: 12/12/02
Posts: 28029
Loc: a prisoner island
I'd also ask Kestas' question...

there's more water in the assembly lubricant than could possibly be carried in with the air.

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#2611633 - 04/27/12 07:13 PM Re: Nitrogen pressure fluctuation due to tempurature? [Re: hardcore302]
GMZ Offline


Registered: 06/04/06
Posts: 251
Loc: Virginia
Nitrogen does fluctuate with temp I dont care what application. I work on a nitrogen boosted hydraulic powered gun mount and when we take readings there is a plate with a 20 psi difference for every 10 deg rise in ambient temp.
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#2612010 - 04/28/12 07:59 AM Re: Nitrogen pressure fluctuation due to tempurature? [Re: GMZ]
Astro14 Offline


Registered: 10/10/10
Posts: 5001
Loc: Virginia Beach
Yep - same with aircraft hydraulic accumulators. Nitrogen charged, and pressure varies with temperature...you have to compensate for temperature when doing the pre-flight inspection to know if it's at the acceptable pressure or not.
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#2612213 - 04/28/12 02:24 PM Re: Nitrogen pressure fluctuation due to tempurature? [Re: hardcore302]
calvin1 Offline


Registered: 08/08/07
Posts: 779
Loc: Indiana, USA
Back of the napkin fun: The pressure for an ideal gas (N2 is close enough) at 85F (303K) should be about 8% higher than at 45F (280K). This assumes (wrongly, but by how much I have no idea) that the tires don't expand any as the pressure increases. 35PSI at 45F will climb to 38PSI at 85F; the reverse is the same.
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#2612406 - 04/28/12 07:13 PM Re: Nitrogen pressure fluctuation due to tempurature? [Re: hardcore302]
Shannow Offline


Registered: 12/12/02
Posts: 28029
Loc: a prisoner island
And easily verifiable in the stupid weather we've had here this year..

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#2612841 - 04/29/12 10:58 AM Re: Nitrogen pressure fluctuation due to tempurature? [Re: calvin1]
Astro14 Offline


Registered: 10/10/10
Posts: 5001
Loc: Virginia Beach
Originally Posted By: calvin1
Back of the napkin fun: The pressure for an ideal gas (N2 is close enough) at 85F (303K) should be about 8% higher than at 45F (280K). This assumes (wrongly, but by how much I have no idea) that the tires don't expand any as the pressure increases. 35PSI at 45F will climb to 38PSI at 85F; the reverse is the same.


And, in light of that, I will adjust my monthly cold inflation pressure check (and fill) by 1 PSI/10 degrees F if the weather is unusual on that day. E.G. if it's normally 70, but that day it's 50...I will adjust to 1-2 PSI below normal...conversely, if it's 70 that day, and normally 50, or about to cool off, I will go 2 PSI over the normal cold pressure setting...so that my cold pressure setting is correct for the normal anticipated temperature range...

Just a bit OC...similar to most BITOGers and their oil selection...
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