Nitrogen vs compressed air

[Just Weird]

On ‎5‎/‎25‎/‎2018 at 11:43 AM, Sam Lin said:

The AutoExpert guy isn't usually wrong with his science, but he's often wrong with the assumptions that he bases his science on. This is intentional, his channel is a shill advertisement for his car buying service, and by being controversially wrong he gets more viewers.

 

Nitrogen tire fill has the benefit of less pressure variation due to temperature changes, whether seasonal, or from tire heat during each drive. This actually has nothing to do with the nitrogen itself, but with the moisture/humidity level inside the tire. If you fill from a compressor with ambient air, you are concentrating atmospheric humidity into your tire. The tire lube that is used to mount every tire onto its rim also is liquid and ends up inside your tire. That moisture expands and contracts with temperature much more than the air does. You can fill with another bottled gas like CO2 or Argon and get the same results. You can also fill with compressed air that has been through a good dessicant dryer and get the same results. The difference is subtle - most street cars will see around a 1psi hot difference between dried air/N2 and "normal" compressed air. Useless on a street car, may get you the last tenths of a second on a race car, which is why all professional race teams fill nitrogen. Scroll to the last graph here for a real-world study:

https://www.mojotiretools.com/N2_FAQ_Q01.htm

 

There are other benefits to nitrogen fill. While the molecule size is theoretically going to leak a little less, in reality that will never be enough to be measurable. More importantly, another large benefit is again tied to the lack of humidity - if you get low quality tires or have internal tire damage that exposes part of a belt, a dry filled tire will not have the belt begin to rust - that rust can creep along the belt into the tire carcass and cause a delamination. If you have actual standing water inside your tire, this becomes a very large concern. (Don't laugh, it's entirely possible to get liquid with the crappy fill hoses at many tire stations - air cools and condenses droplets of moisture in the hose, those drops run down to the base of a loop in the hose, and after a fill or 2 that water comes out into your tire in liquid form. If you've ever heard liquid gurgle while filling, or seen a spray of mist out of the filler, that's liquid potentially into your tire. To guard against this, trigger the machine to fill and hold the nozzle open with your hand so it blows some air and purges the hose before you connect it to your tire valve).

 

If your rims do not have 2 opposing valves, you can still purge over 99% of the moisture from within by doing multiple fill, vent to atmosphere, fill, vent to atmosphere cycles using nitrogen or dried air. One of the new Bangchak near the head of Phahonyothin actually installed a nitrogen generator when they opened, and had it feeding their tire fill. I did this fill/vent/fill/vent process a number of times there. However, they clearly didn't maintain the generator and it faulted after about 6mo, at which point they simply removed it and replaced it with a normal air compressor.

Yawn...

[transam]

12 minutes ago, Just Weird said:

Yawn...

Hey, you Honda Click guys should stay in your domain....

[HAKAPALITA]

They all come from the Darkside where the peasants live.


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