Nitrogen experiment

[Kasey Lewis]

Because I do get bored at work sometimes, let me make sure I've got this right. According to Mitch and Jeremy, there is no difference between compressed air and compressed nitrogen in my tire over a 30f differential. There will be a negligible difference in pressure changes one to the other. So if I set my pressure at 28psi and 170f then heat to 200f I will get the same pressure reading either way, whatever it may be?

And would an industrial oven be an acceptable test, say 20 min at 170f then 20 at 200f?

My obviously incorrect data showed 24psi hot on the warmers 170f, and 30 hot off the track at 200 with compressed air, and 28 and a little over that on nitrogen.

[Mark Windham]

http://bit.ly/14k4w1s

[Kasey Lewis]

http://bit.ly/14k4w1s

Bubba if I believed everything I find on google search....I'd be 4" longer....and I don't trust an engineer farther than I can throw him. As a real world systems technician, I've had to fix massive clusterf$@&s some engineer said should work perfect because the math says so. It's my time to waste and so I shall! :p

[Jim Dugger]

I think it's a worthwhile test. You may find you have to do this on subsequent days you are able to achieve the same temp and humidity levels, allowing for the wheel to fully cool to the same temperature before starting the test each time.

[Ryan Warren]

My obviously incorrect data showed 24psi hot on the warmers 170f, and 30 hot off the track at 200 with compressed air

Am I the only one who sees a six lbs rise from "on warmers" to "off track" as a crazy high increase? what rubbers are you running?

[Mitch Williams]

Because I do get bored at work sometimes, let me make sure I've got this right. According to Mitch and Jeremy, there is no difference between compressed air and compressed nitrogen in my tire over a 30f differential. There will be a negligible difference in pressure changes one to the other. So if I set my pressure at 28psi and 170f then heat to 200f I will get the same pressure reading either way, whatever it may be?

And would an industrial oven be an acceptable test, say 20 min at 170f then 20 at 200f?

My obviously incorrect data showed 24psi hot on the warmers 170f, and 30 hot off the track at 200 with compressed air, and 28 and a little over that on nitrogen.

I didn't say there would be no difference in Nitrogen and air. I said that you were wrong when you said your tires, filled with Nitrogen, had no pressure change when the temp changed. In the second post on the previous thread you said that your tires were 28 PSI all the way from cold to 200 degrees F. I say that's impossible. Jim even posted an easy-to-read graph that showed the difference between dry Nitrogen and moist air. You may indeed prove the laws of physics to be incorrect. They used to think the earth was flat and that the universe rotated around the earth. Both of those ideas were proven to be untrue. "Lewis's Law" may replace those laws currently accepted as fact........but I doubt it.

I'd still volunteer to help Allan figure out how much pressure he loses on his way from the track to the pits. That would be interesting and useful.

[Jim Dugger]

Am I the only one who sees a six lbs rise from "on warmers" to "off track" as a crazy high increase? what rubbers are you running?

Yea, that's a LOT. 1-2 is common.

Time to get a pyrometer and see if those warmers are working, too. I've also found I get quite different results from track-to-track unless I'm on my Honda generator. Line loss, loads and all... TWS power is complete garbage.

[mark niemi]

Because I do get bored at work sometimes, let me make sure I've got this right. According to Mitch and Jeremy, there is no difference between compressed air and compressed nitrogen in my tire over a 30f differential. There will be a negligible difference in pressure changes one to the other. So if I set my pressure at 28psi and 170f then heat to 200f I will get the same pressure reading either way, whatever it may be?

And would an industrial oven be an acceptable test, say 20 min at 170f then 20 at 200f?

My obviously incorrect data showed 24psi hot on the warmers 170f, and 30 hot off the track at 200 with compressed air, and 28 and a little over that on nitrogen.

just put your head in the oven. that's probably what mitch is considering.

[Kasey Lewis]

Yea, that's a LOT. 1-2 is common.

Time to get a pyrometer and see if those warmers are working, too. I've also found I get quite different results from track-to-track unless I'm on my Honda generator. Line loss, loads and all... TWS power is complete garbage.

I'm always on my own power, and hopefully the new carbon MotoD's I got work well, they always seem to be hot. Ill be keeping a log now on my tires to see cold/on warmers/off track pressures. Maybe I just drink too much.

[Kasey Lewis]

Am I the only one who sees a six lbs rise from "on warmers" to "off track" as a crazy high increase? what rubbers are you running?

Michelin power cups. Like dugger said, I need to check my warmers. Would 4-6 be normal for cold to off track? They always seem to be hot. Temp gun said they were close, but I only check randomly with the gun.