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post #11 of 16 (permalink) Old 02-10-2009, 04:17 PM
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Default Re: Tires

This doesn't relate to "tires" especially, but back to the ever going subject of "nitrogen" in the tires. (Which I've always felt was not necessary.)
Had my pickup in for a lube change this morning and mentioned I wanted the tires serviced with 35 pounds because I have been having to add 8 to 10 pounds monthly since December and nightly temperatures well below freezing. I have a set of "Mag" wheels on the truck and the lube center advised me that they were getting so many complaints about air loss with mag wheels that they've decided the loss occurs because of the fluctuation of temperatures from night to day noon. They are planning on installing "Nitrogen" tanks for winter tire service because of this problem. (interesting.) Seems that nitrogen does not leak as fast as the air with the change of temperature.



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post #12 of 16 (permalink) Old 02-13-2009, 07:55 AM
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Default Re: Tires

Nitrogen?

Is this a matter of air expanding and contracting due to temperature variation greater than the expansion and contraction of the gas Nitrogen due to temperature variation?

If nitrogen is, indeed, a factor in improving mileage - reducing CO2 emissions, reducing dependence on foreign oil, looks like we'd be fools not to use it.

How hard is it to extract Nitrogen from the air - enough to fill tires?

Really, I meant how energy intensive is the extraction of nitrogen from the air? How does it effect the carbon footprint of a prius.

(What exactly IS the carbon footprint of a Prius?)

Steve

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post #13 of 16 (permalink) Old 02-13-2009, 09:37 AM
 
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Default Re: Tires

Pure dry nitrogen is used in aircraft and race car tires, but it is completely insignificant in consumer tires. It is not worth driving any extra distance to get, and not worth paying anything extra for it. Recall that ordinary air is 79% nitrogen, and ordinary tire pumps already remove most of the water vapor from air.
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post #14 of 16 (permalink) Old 02-13-2009, 10:41 AM
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Default Re: Tires

However, that is why I brought the subject back up. I had ridiculed the use of it in standard car tires and figured it's use as a marketing gimmic only. If I have to put eight more pounds of "air" in my "mag wheeled" pickup truck at the end of this month I'm taking it over to Discount Tires and having all four serviced with nitrogen for the rest of the winter.



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post #15 of 16 (permalink) Old 02-13-2009, 11:32 AM
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Default Re: Tires

Maybe your mag wheel(s) have a pinhole leak. It's not unheard of.
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post #16 of 16 (permalink) Old 02-13-2009, 02:54 PM
 
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Default Re: Tires

If the tires are losing pressure it's because there is a leak (bad bead, poorly-sintered wheel material, etc.). Pure nitrogen will not fix leaks.
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