NOS is considered an "oxidizer" due to the fact that fuel needs air or o2 to burn. Yes, NOS has slightly more 0xygen than air (about 10% more) but this will make no difference in aging of rubber etc. (Especially in racing, as most tires only last a few weekends on the outside)
There should be more of a concern with filling tires with air, since there is moisture in the air and this can provide problems in the tires as far as pressure swings as the water vapor gets heated it turns to gas, and increases pressure more than it would if you used just NOS or Nitrogen or even C02.

everyone gets scared of NOS. I think they are confusing it with Nitro Methane. NOS , is basically just air in liquid form, as most commonly seen.

MK

 

Mark,
Interesting. As I stated in my post, no expert, just trying to think it through.

If moisture is the "killer" here, I would think a drier cartridge (tube filled with silica jel) in the air line before it gets to the tire would be good, cheap insurance. The silica gel can dry air to a dew point of -40 and be easily regenerated in any oven.

 

Air is used to boost hp, by superchargers and headwork. since the increased Oxygen content is slightly more, it would not be a factor in oxidizing your tires anymore than just plain air. the temp of the tires and pressure dont really change that much. (more temp than pressure, as even racing we only see a 4-5psi difference from racing to cold tires. And thanks to Boyles law, the temp goes up and then the pressure goes up the same percentage. {i.e 5psi is 134% })

it is used to make more HP by haveing it in liquid form, under 1000psi of pressure and alowing this mass flow to be matched with fuel. 10lbs of NOS can be matched with 1/12th the amount of fuel and produce 50hp for about 12 x 15 second shots!!

MK



>>>>>>Yikes Using NOS to fill your tires!

i am no expert in this topic, butNOS is a powerful oxidizer (that's way it is used to boost engine power (more oxygen per volume than air, means you can put more fuel and gernate more power). I would expect to NOS to oxidize the the rubber in the tires and make it brittle. The reliablility folks call this rapid aging. Increasing temerature and pressure increase the rate that this happens.

IMHO, this is to be avioded since the failure will be from the inside out and may not be detected until it is too late.

--------------------
Harry

 

MK,

Thanks for the info. You are adding to my trove of knowledge. Thanks!

 

I really like Nitrogen!!!! A small tank with regulators and hoses/fittings is not too expensive! I run eight open road races,use air tools and fill my friends tires on a single tank about the size of a scuba "single 72" type. The refill is $12.00!

Cheers

R

 

Any processed gas will work well as it will be pure and dry. Scuba is the cheapest per psi, but yout have to be certified. The dry gas will help regulate your heat pressure gain. What about helium? We could have a negative weight in the tire...hmmmm

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by ltc:
<strong>Anyone ever used one of these (aluminum) portable air tanks?
<a href="http://www.tricktank.com/tanks.html" target="_blank">http://www.tricktank.com/tanks.html</a>
85-125psi, aluminum, apart from price it seems pretty good, lightweight.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">I bring one to the track all the time, it's nice and light.

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Ed Newman:
<strong> .. snip ... What about helium? We could have a negative weight in the tire...hmmmm</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica"><img border="0" alt="[hiha]" title="" src="graemlins/roflmao.gif" />

Unfortunately, helium is one of the most difficult gases to keep in a container due to the small molecule size. At where I used to work, we use helium to find microsopic leaks. The rubeer in the tires would be extremely porous. Also, if I am not mistaken, the thermal conductivity of helium is very different than that of air. This may lead to performance issues due to heat gain or loss when running.