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Old 04-25-2017, 01:16 PM   #1 (permalink)
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Fun video time! How many PSI to explode a 20 year-old, dry-rotted tire?

Answer: 220 PSI!

Quote:
220 PSI CAR TIRE EXPLOSION !
We found a couple of these old tiers so we figured that we need to test and see how much pressure can these tires take. Our main goal was to see a tire explosion. Some people call it tire blow out ( tire blowout) or tire burst but it surely is a tire explosion. A tire blowout doesn't sound like a tire explosion.

So anyway we took out our compressor that can pump out to 200 psi. We hooked the tire to the high pressure compressor and started inflating the tire. For our surprise we pumped 200 psi and maxed out the compressor but no tire explosion. Nothing happened, the tire inflated, stretched out a bit and that is it. There was no tire explosion.

But we are stubborn and wanted to see a tire explosion, so this is what we did. We took our carbon dioxide tank that had 360 psi of pressure inside of it. We went out to the forests because we know that with this kind of pressure the blowout ( tire explosion ) was not safe. We took all of the needed safety precautions and hooked everything up. We started to pump the carbon dioxide in to the tire and finally at 220 psi (16kg/cm2) we saw the tire blowout. The tire explosion was phenomenal. It sounded like a gun shot. But for our surprise there were no debris flying around. The tire neatly blowout on the side leaving a huge open gab.

We liked the result and wanted to repeat our tire explosion. So we hooked one more tire up. This blowout send the tire flying in to the air with leaving us searching the near by bushes to find the tire.

After we were done all of the tires were disposed of properly and nothing was left behind.

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Old 04-25-2017, 02:07 PM   #2 (permalink)
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Haha, fun video! Explosions are so entertaining...

That being said, I'm probably going to keep my tires at 50 psi for now.
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Old 04-25-2017, 02:19 PM   #3 (permalink)
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Not much to gain by going a much higher, anyway!



Experiment: coast down distances (rolling resistance) @ various tire pressures
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Old 04-25-2017, 03:14 PM   #4 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
How do you know for sure...???

You can't technically say that till you take the chart all the way to 219 psi...

The trick is don't let it go to 220 psi...

I would like to know, and I'm pretty sure there are other inquiring minds here that would really, really, really, like to know.



So Metro.

Do it...



Do it.

For the sake of science.

For this forum.

For the children...



I would also like to take this time to say "Thank you".

Ahead of time...

You know...

Just in case...





>
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Old 04-25-2017, 03:30 PM   #5 (permalink)
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Good idea! I'll set up the camera on a tripod... hopefully my heirs will (a) find it near the blast radius and (b) can figure out how to post the results.
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Old 04-26-2017, 02:19 PM   #6 (permalink)
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Cool video, thanks Metro.

I wonder what it's rated pressure is, probably 35psig for an older tire? If so, that's still about four and a half times it's rated pressure.

Typically in engineering, things are designed to a safety factor. Safety factor of 2.0:1 means that it was designed to twice the rated load. For the products we design where I work, because the failures could cause death, safety factors are 4:1, 6:1, or 10:1. I can see tires being in the same category, so I would expect a 4:1 or 6:1 safety factor. I'm impressed that the tire still has such a high burst pressure considering it's age.
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Old 04-26-2017, 03:37 PM   #7 (permalink)
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Factors to consider:

1) That 220 PSI is static pressure. In driving, you'd likely see jumps as the wheel goes over bumps & potholes. (It'd be interesting to see if anyone has actual data on this.)

2) 220 PSI is cold pressure. Drive for a while and the heat will increase the actual pressure. so maybe 150 PSI or so would be the max cold inflation pressure.
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Old 04-26-2017, 03:51 PM   #8 (permalink)
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I'm not going a pound over 125. I like the smoother ride of the low 100's.
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Old 04-26-2017, 08:07 PM   #9 (permalink)
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Old 04-26-2017, 09:33 PM   #10 (permalink)
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Quote:
Originally Posted by freebeard View Post
Technically the split rim, well split, the tire looked fine

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