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Old 05-08-2014, 01:22 AM   #131 (permalink)
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Old 05-08-2014, 01:35 AM   #132 (permalink)
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Interesting , to bad its been edited for release.

I mentioned the psi as I have a paper on gases and psi and various temperatures and it stated this:
r403a
@ 68 *F is 142 psig
@ 122*F is 318 psig

That's all I know !
I'm not trying to poop on your idea, I am just worried about those numbers :-)
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Old 05-08-2014, 01:57 AM   #133 (permalink)
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Quote:
Originally Posted by ecomodded View Post
Speaking of heat
Won't the heat generated by the tire raise the psi of the R404a quickly ?
I don't know. Maybe this why they use the CO2 in the half CO2/404a mix, to quell some of the properties that make R-404a a good heat mover.
I cant find any definitive, aaa ha, reason for the CO2 that stands out.

The 2 main ingredients of R-404a are kind of cool.
R-143a (aka canned air) has some interesting inferred absorbing properties.
R-125, HFC-125 is kind of neat too, in its other life its used for fire suppression, it pulls heat away from burning material so fast it shuts down the combustion decompression process, in addition to suffocating the fire. Not a bad material to have inside your tire.
R-134a, (only 4% of the blend) is there to make the other 2 play nice when inside a heat pumping system.

So R-125 sounds like the best thing, but I would be willing to bet its already been tried by its self and not favored.
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Old 05-08-2014, 02:31 AM   #134 (permalink)
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I'm wondering if they use a pressure relief valve , because something is fishy with the psi or I "think" something is fishy with it..
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Old 05-08-2014, 05:17 AM   #135 (permalink)
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Quote:
Originally Posted by ecomodded View Post
I would like to find a way to fill a tire with a durable dense memory type of foam.
There must be a super foam of sorts that would work.
I did use goo in my old mopeds tires until my rear tire blew up and I nearly crashed.
The bicycle repair shop pointed out that the tire was damaged earlier on but I had failed to notice it because the goo sealed the gap.
Without the sealant I would have spotted the leak earlier and not have endangered myself. Maybe I could have removed the cause and even save the tire...
The same is true for tires filled with foam of course.

So tire sealant may be a solution for emergencies to seal leaks that cannot be fixed in another way, but prefilling tires with sealant or foam is rather dodgy.
A leak is a sign of tire damage, it needs inspection; the fact that the tire goes flat forces you to inspect it. It is a safety feature

My car has an emergency repair kit aboard but I will only use that if there is no alternative, and then change the tire at the first opportunity.
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Last edited by RedDevil; 05-08-2014 at 05:23 AM..
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Old 05-09-2014, 02:29 PM   #136 (permalink)
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Quote:
Originally Posted by ecomodded View Post
I'm wondering if they use a pressure relief valve , because something is fishy with the psi or I "think" something is fishy with it..
F1 and indy cars use a pressure relief valves on their tires. It takes the guess work out of how much to inflate the tires when they are cold.
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Old 05-11-2014, 02:59 AM   #137 (permalink)
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Quote:
Originally Posted by ConnClark View Post
F1 and indy cars use a pressure relief valves on their tires. It takes the guess work out of how much to inflate the tires when they are cold.
Good tip ConnClark , I looked into it and found these cheap ones available retail.

some info:

Click image for larger version

Name:	temperature psi valves.JPG
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Size:	28.8 KB
ID:	14985

Stop trying to guess how much your tire pressure will increase as the tire temperature increases (and struggling until the pressures come up to where you want them)! Just set the tires to your desired pressure and let these relief valves automatically vent excess pressure as you race. Their reliability has been well proven by thousands of circle track racers from Sprint Cup on down. Features lightweight aluminum construction (only 9 grams), built-in 100 mesh filter and an enclosed poppet for protection from dirt. They can also be locked shut. To install, just drill and tap a 1/8 NPT hole in the rim near the valve stem. If your rims are too thin to tap (steel wheels, for example), just drill a 11/32 inch hole and use the (included) sealing jam nuts on the inside of the rim. The lightweight valves do not affect tire balance. As delivered, the adjustment range is from 15 to 30 psi. Pressures from 3 to 15 psi can be obtained by changing to the (included) low-pressure springs. For pressures from 30 to 38 psi, simply install the (included) shims above the standard springs.
```````````````````````````````````````````

Although they would leave your tire low on air when you stop driving and they have cooled off , after realizing that point I think they best used in races like the label says..
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Last edited by ecomodded; 05-11-2014 at 03:38 AM.. Reason: add although..
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Old 05-21-2014, 08:47 AM   #138 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
I run 'em to failure and extract the last possible mile. Sometimes that means blowouts and flats. Sometimes I deem the tire a good candidate for getting a tube if the tread is still deep. Never has it caused anything worse than a minor inconvenience.

I'll have to look for a date code on the wide whites the '59 wears in the spring when I get it out- they have to be 20 years old and their gonna stay on there until they physically can't.
Drama queens want more regulations: Just How Dangerous Are Aging Tires?

Got the '59 out- codes must be on the inner sidewalls; couldn't see any on the side with the wide whites.

Edit: Yup, code on the inside: 196, or April 1996- 18 years old. Amazing thing is, they sit outside all summer. After sitting inside all winter they aren't even low on air!

Quote:
Originally Posted by oil pan 4
On cars its more like 12 years, the side walls just crack so much you wash you car one day and see soap bubbles forming on the side wall. And then you just found that slow leak you have had for a while.
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Old 12-19-2015, 02:06 PM   #139 (permalink)
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The successor to nitrogen tires:
http://ecomodder.com/forum/showthrea...air-28914.html
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Old 12-25-2015, 05:47 PM   #140 (permalink)
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very informative. thanks guys.

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