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#1
10-30-2010, 11:19 AM
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The only gain I think is real, is the Nitrogen does not expand or contract under hot and cold conditions... thus keeping your tire pressure the same under either condition... but that is a tiny gain for $30, IMO.
__________________
  Pro motocrosser since 2005. First time BMW owner. 2002 4.4 E53 
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#2
10-30-2010, 12:58 PM
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It has been repeated and believed like an internet rumor, but is just false. Nitrogen, like air, obeys the ideal gas law. It cannot escape this reality: PV=nRT End of story. But the back story: Uncontrolled fill in tires includes moisture. Although atmospheric gases follow the ideal gas law, MOISTURE does not and will create pressure variations as it heats. When race cars, aircraft tires are filled with 99.99% pure technical nitrogen, care is taken to eliminate any moisture. Great. Unfortunately this "moisture free' condition is not assured with commercial 94% pure nitrogen generators. They take a truth (race cars abd jets use 99.9% pure, moisture free nitrogen) and use just the nitrogen part (94% with limited moisture control) to convince people ALL the benefits will be included. Even sillier are the claims of safety, tire life, never needing to check air pressure, etc...
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#3
10-30-2010, 01:20 PM
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Im positive nitrogen has this property. But I will say that we do keep the bladders that we fill is 99.9% pure, moisture free nitrogen. The bladder is the black rubber piece in the bottom right corner.  ^^^ In this case the the "gas under pressure" is the nitrogen that is held in a rubber blader, to keep it from being contaiminated by any oil that may be present. As the shock heats up to over 300* that heat would drasticly change the propertys of how the shock worked, if the bladder was filled with comp. air. Filling it with nitrogen keeps the shock working consistantly from first using it and its cold, all the way up to OP temps.  (I'm bad speller... sorry)
__________________
Pro motocrosser since 2005. First time BMW owner. 2002 4.4 E53 Last edited by Jordo; 10-30-2010 at 01:32 PM.
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#4
10-30-2010, 01:36 PM
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Sorry you are not a physicist. Nitrogen is inert, that is critical in many sealed components- it decreases corrosion and breakdown. True. But it still expands with temperature. You cannot change that. As you point out, MOISTURE FREE is the key! You get that from a green bottle with a tag that says "99.99% certified moisture free technical grade" Like I said, so many people have been told "nitrogen doesnt expand" that even 'professionals' will believe this! I am sure you were told this, and now you hold that as a belief. The person that told you- yes, he believes it as well. Sorry to break that bubble, but nitrogen expands.
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#5
10-30-2010, 01:42 PM
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Originally Posted by Jordo  I disagree. Nitrogen is used in suspension componits for the benifit, of its ability to not change in pressure from hot to cold. (well some change, but much less then norm. compressed air) I worked in a -performance only- suspension and motor shop for a few years building Motocross suspension. Im positive nitrogen has this property. But I will say that we do keep the bladders that we fill is 99.9% pure, moisture free nitrogen. The bladder is the black rubber piece in the bottom right corner. (I'm bad speller... sorry)
__________________
Pro motocrosser since 2005. First time BMW owner. 2002 4.4 E53
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#6
10-30-2010, 01:54 PM
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You cannot say "Nitrogen doesn't expand" but then say "well some, but less than "norm" compressed air." Either the discussion is "does nitrogen obey the ideal gas law and expand just like air and all other gases or does it not?" As a separate issue, we can discuss the impact of MOISTURE in nitrogen and the impact of moisture in air. Moisture free air = moisture free nitrogen Uncontrolled air< moisture free nitrogen Uncontrolled nitrogen at tire store = uncontrolled air at tire store So why spend $30 for nitrogen at the store? IF as JCL comments, the nitrogen is drier than the air (and there are no specs on this, no claims on this, no data on this) then the DRIER the fill the better, but otherwise no benefit.
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#7
10-30-2010, 03:45 PM
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"There is no significant difference in expansion and contraction characteristics of nitrogen compared to air when moisture is absent. Expansion or contraction of either gas, in relation to temperature change, occurs to a similar extent over the commonly encountered pressure and temperature ranges relevant to the discussion of tire inflation. There is no practical difference as long as the gases are dry in a fixed volume container such as a tire." The difference is completely due to moisture content, not because it is Nitrogen. Nitrogen is inert, and that is why it is used in shocks, e.g., does not promote corrosion or degradation/oxidation of bladder or seals.
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