Any one know of a tire place serving up nitrogen in NH, MA or RI ?

It's getting to that time of year when a change over would be most practical with the temp changes.

 

Just like snake oil.....snake air!!

Worthless.

 

Science, Very Simple science.

Colder ambient air and varying temperature increase / decrease due to friction.

Why do you think that every jet (not put-puts) in the country has nitrogen in the tires?


I have seen Mystery Oil (snake oil) successfully used in an airplane engine to loosen up a sticking ring and for long term storage.

 

Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.

I guess if I was coming out of -20 to -30 temps and slamming on a runway at 150 mph I would want 20% more nitrogen in my tires.

Or if I was racing where I would want a little more stable tire pressure, I would use 20% more nitrogen.

But on the whole I don't think its worth the bother, but I do like those little green caps.

 

Right you are!!! And science doesn't support any reason at all to run nitrogen in the tires of a street car.



The ONLY reason the FARs require transport category aircraft to run nitrogen in their tires is because it's an inert gas - actually, the FAR doesn't specify nitrogen, but it says that 95% of the inflation gas must be inert.

A 767 or 747 tire pressure is in the range of 200 psi. When the gear is retracted and stuffed into a very small gear well with fuel and hydraulic lines running all throughout, you can have a big problem with a wheel well fire and a source of high pressure oxygen. The wheels have fusible plugs that will melt due to high temp from the tire flexing or a fire in the wheel well that allows the tire to depressurize rather than burst - they burst when the pressure reaches something around 1,000 psi, which would be like several hand grenades going off!!!

If the several hundred psi gas that came blasting out of the hole when the fusible plug melts was "air", the oxygen in the air would act like a blow torch!!!! I'm sure you've blown on a fire to fan the flames. An inert gas like nitrogen won't fan the flames at all - might even help to smother the fire if it reduces the oxygen concentration in the area.

There's nothing in the FAR that says anything about the moisture content of the gas used to inflate aircraft tires, but that may be the only reason to run nitrogen in car tires is because it's DRY!! The humidity is almost totally removed from it, and the humidity in normal air may allow the pressure to change a little more with variations in temperature.

However, EVERY gas will comply with the laws of science/physics - every gas will expand when heated, or if it's constrained in a fixed volume container like a tire, the pressure will increase. All gas will do that, including nitrogen.

Selling nitrogen to fill tires on street vehicles is a "profit center" for a tire shop - they make money doing it!!!

When filling tires using nitrogen, if the shop just drops the pressure to zero, the tire is still filled with a bunch of air. If they then bring it up to operating pressure with nitrogen, you'll probably be running 85% to 88% nitrogen vs. the 78% in the air we breathe.

To really "fill" the tire with nitrogen, the shop needs to have a machine that will evacuate the air out the tire so that when they fill it with nitrogen you get close to the 95% required in transport aircraft tires.

Good luck finding a location near you to do it, but as others have said, it's really not going to do anything for a street driven car.

Bob

 

A few good points here.

http://www.tires-inc.com/nitrogen.htm

http://www.motorsportreport.com/inde...=1:latest-news

http://www.theautochannel.com/news/2...17/004282.html


Here's some more downside.

http://www.thetruthaboutcars.com/200...with-nitrogen/

I think that I'd stick with the black caps.

 

Actually, the type of gas in the tires IS in the equation on that one. It's the ONLY reason that an inert gas is required in aircraft tires.

Take a look at the NPRM that changed FAR 25.733:

http://rgl.faa.gov/Regulatory_and_Gu...d!OpenDocument

Because of the oxygen content when using compressed air there were several tire explosions from volatile gases given off from the tire liner at high temps - and that's why paragraph (e) was added to 25.733 that requires an inert gas in aircraft tires.

Regardless of what gas you use to inflate a tire, if the temp goes up up the pressure goes up.

If you want to put nitrogen in your tires, go ahead. I think Costco stores can do it for you.

Post over in the Regional/Northeast section of the forum and maybe more people will have info on locations near you.

Bob

 

Regulations are typically written in a reactive way. All this really proves is that something happened once and the reg resulted as an epitaph.

Safety isn't the result of regulation.


Thanks, I'll check Costco

 

Any welding supply shop.

Ed LoPresti

 

the IRL doesn't use 100% nitrogen but, they do have tens of thousands of dollars in compressed air drying equipment

it's all about the moisture content

 

Exactly..........it's very friendly for your air tools. Especially here in Florida. But nearly useless in your street tires.........unless you get it free, at the same price as air !!!!