Normal tire pressure is about 30-40 PSI and a bad rupture can kill you or break your bones even at that pressure if you’re standing next to the tire.
This person has just installed four bombs on their vehicle that will go off at the slightest inconvenience. A 90 PSI car tire is an imminent risk of death to the driver and everyone around them. Do not let your friends or family do this.
There are a lot of tragic stories of people that had the idea “I’ll slash the tires to this trucker to teach him a lesson” but instead they got a physics lesson
If it were up to me to do so, I’d remove the valve core to let the tire vent some pressure. Might still recommend some safety glasses for it though because if you don’t have a good grip on that core it’s going to fire itself out of the valve stem like an air rifle pellet.
If you don’t have a valve core removal tool then you can also just press down on the tip of the valve core with a small screwdriver or something, but you might be risking some damage to the core doing that, and you’re going to be sitting there an awful long time listening to it psssshhhh its way back down to 30. Even if you do damage the core it’s nothing that isn’t fixable at a tire shop though.
DO NOT TRY TO REMOVE THE VALVE CORE AT THOSE PRESSURES.
Just do the push thing. One slip and that core at best is lost at worst injures you or a bystander. They are finicky as hell when you get to the last few threads.
Also, the higher the pressure is, the faster it will deflate. It won’t take that long. Plus, if you do decide to pull the core. At 90psi air rushing out from a small orifice like that is loud enough to cause hearing damage.
Slow controled release of pressures is the standard procedure for any pressure vessel. Be it a tire at 90psi, a radiator at 15psi, hydraulic excavator at 5000psi, or a fuel injection pump at 30,000psi.
I suppose though, even If handled correctly and if the valve happens to incur no damage during pressure release, the tires will still be garbage after that, won’t they?
Uhhhhhhhh take this with a grain of sodium. But probably not, when your have your wheel at let say max psi on the side wall, so my truck tires are rated for a max of 80psi. Passenger car tires are typically 50psi. Now when you are driving along you hit a big pot hole or ride over a curb. When backing out of the drive way. In that moment that tire pressure will spike as wheel collapses in. Mind you it’s very brief and probably designed for that.
Now The best way to tell would be to look for belt shift or separation. It’s pretty easy to see. There will be basically a bulge on the side of the tire or in the center. Where the belting split apart and the rubber in that spot can stretch like a balloon. You will feel it to. The fucked tire will vibrate alot when driving. Very noticeable. Like rattle your teeth noticeable.
I didn’t figure 90PSI to be all that dangerous, we use a cheetah tank at my job sometimes for seating tires and that fires at 120PSI, but it’s through a much larger orifice - so it wouldn’t be as loud as through the valve stem. Losing the valve core is also a real possibility.
I, a professional dumbass and mechanic, would probably pull the cores at any pressure up to but definitely not exceeding 100, and may very well regret my decision to do so. Any normal people who value their safety and don’t deal with tires on a daily basis, and don’t have a stash of a thousand spare valve stems 20 feet away, should exercise more caution.
Thanks for calling me out on that, I probably don’t respect lowish high pressures as much as I should. I’ll try to keep an eye on that (from behind my safety glasses).
For the non car-folks in this thread :
Normal tire pressure is about 30-40 PSI and a bad rupture can kill you or break your bones even at that pressure if you’re standing next to the tire.
This person has just installed four bombs on their vehicle that will go off at the slightest inconvenience. A 90 PSI car tire is an imminent risk of death to the driver and everyone around them. Do not let your friends or family do this.
It’s 110-120 for semi trucks. Just a note to not linger by their tires. Blowouts are statistically uncommon, but there’s a lot of trucks out there
There are a lot of tragic stories of people that had the idea “I’ll slash the tires to this trucker to teach him a lesson” but instead they got a physics lesson
And is there non-deadly way of disarming those bombs then?
If it were up to me to do so, I’d remove the valve core to let the tire vent some pressure. Might still recommend some safety glasses for it though because if you don’t have a good grip on that core it’s going to fire itself out of the valve stem like an air rifle pellet.
If you don’t have a valve core removal tool then you can also just press down on the tip of the valve core with a small screwdriver or something, but you might be risking some damage to the core doing that, and you’re going to be sitting there an awful long time listening to it psssshhhh its way back down to 30. Even if you do damage the core it’s nothing that isn’t fixable at a tire shop though.
DO NOT TRY TO REMOVE THE VALVE CORE AT THOSE PRESSURES.
Just do the push thing. One slip and that core at best is lost at worst injures you or a bystander. They are finicky as hell when you get to the last few threads.
Also, the higher the pressure is, the faster it will deflate. It won’t take that long. Plus, if you do decide to pull the core. At 90psi air rushing out from a small orifice like that is loud enough to cause hearing damage.
Slow controled release of pressures is the standard procedure for any pressure vessel. Be it a tire at 90psi, a radiator at 15psi, hydraulic excavator at 5000psi, or a fuel injection pump at 30,000psi.
I suppose though, even If handled correctly and if the valve happens to incur no damage during pressure release, the tires will still be garbage after that, won’t they?
Uhhhhhhhh take this with a grain of sodium. But probably not, when your have your wheel at let say max psi on the side wall, so my truck tires are rated for a max of 80psi. Passenger car tires are typically 50psi. Now when you are driving along you hit a big pot hole or ride over a curb. When backing out of the drive way. In that moment that tire pressure will spike as wheel collapses in. Mind you it’s very brief and probably designed for that.
Now The best way to tell would be to look for belt shift or separation. It’s pretty easy to see. There will be basically a bulge on the side of the tire or in the center. Where the belting split apart and the rubber in that spot can stretch like a balloon. You will feel it to. The fucked tire will vibrate alot when driving. Very noticeable. Like rattle your teeth noticeable.
This is good advice.
I didn’t figure 90PSI to be all that dangerous, we use a cheetah tank at my job sometimes for seating tires and that fires at 120PSI, but it’s through a much larger orifice - so it wouldn’t be as loud as through the valve stem. Losing the valve core is also a real possibility.
I, a professional dumbass and mechanic, would probably pull the cores at any pressure up to but definitely not exceeding 100, and may very well regret my decision to do so. Any normal people who value their safety and don’t deal with tires on a daily basis, and don’t have a stash of a thousand spare valve stems 20 feet away, should exercise more caution.
Thanks for calling me out on that, I probably don’t respect lowish high pressures as much as I should. I’ll try to keep an eye on that (from behind my safety glasses).