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Nitrogen in the tires

18 messages,  Last post on Aug 11, 2009 at 6:09 PM

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#15 of 18 Re: our local tester reports in [tidester] by m6user Jul 23, 2009 (6:37 pm)
Replying to: tidester (Jul 23, 2009 3:54 pm) Air has always been reliable for me as well but I still had to add air at least a couple of times a year. Do I need the full nitrogen? Not at all but it is very nice to have have full tires all the time and not have to check nearly as often especially when it's cold as a welldiggers a** out.   I wonder if the nitrogen, because of it's molecule density, is less inclined to contract in cold temperatures. Usually when it's very cold tires need a little more air but mine stayed full all winter. This could all be a coincidence of new tires and a great seal/installation job but it sure is a pleasant experience. Replies to this message: tidester (Jul 23, 2009 9:03 pm)
#16 of 18 Re: our local tester reports in [m6user] by tidester HOST Jul 23, 2009 (9:03 pm)
Replying to: m6user (Jul 23, 2009 6:37 pm) I wonder if the nitrogen, because of it's molecule density, is less inclined to contract in cold temperatures.   Under "normal" conditions, nitrogen and oxygen molecules both behave pretty much as ideal gases so their density variation with temperature will be substantially the same.   The relevant factors are molecular size and molecular speed. Nitrogen molecules are larger than oxygen molecules (by about 6%) so they will be less likely to escape through a "hole" in a single encounter. On the other hand, nitrogen molecules travel a little faster than oxygen molecules for a given temperature (also about 6!) which gives them more frequent opportunities to escape. In the end, it should be pretty much a wash between the two molecules.   On the other hand, the air that you pump into your tires has some water content which is not present when you use pure nitrogen to fill your tires. Water vapor accounts for some of the pressure in your air-filled tires and it can leak out more quickly than either nitrogen or oxygen.   In any case, I'm glad you're happy with your new tires and your N2!   tidester, host SUVs and Smart Shopper
#17 of 18 Need my Nitrogen Tires Filled by dago55 Aug 11, 2009 (6:00 pm)
I have been chasing the dealership I purchased my Nissan Versa from about getting my tires filled; since unbeknown to me the tires are filled with nitrogen. Each time I have called the dealership; plus stopped in they tell me the machine is broke. I check with Discount and Big O and they don't carry nitrogen.   I live in AZ and my tire light is on and my tires are low...Can you add air to the nitrogen tires without damage. Any ideas, I am getting very ticked off... Replies to this message: m6user (Aug 11, 2009 6:09 pm)
#18 of 18 Re: Need my Nitrogen Tires Filled [dago55] by m6user Aug 11, 2009 (6:09 pm)
Replying to: dago55 (Aug 11, 2009 6:00 pm) You can add regular air to nitrogen filled tires. It will just dilute the nitrogen a very small percentage. Normal air is about 80% nitrogen and 20% oxygen. So by putting air witht the nitrogen you would have just a couple of % oxygen versus about 100 nitrogen. Over time, and without additional nitrogen you would get closer to a regular air mixture.   I have had very good luck in Chicago area with two vehicles with nitrogen(nothing added for almost a year in both vehicles). Maybe the high temperature of AZ affect the nitrogen more. I wouldn't know about that but it is certainly ok to add regular air.

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