this post was submitted on 02 Sep 2025
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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).
Yeah, I learned the hard way about pressures and what they can do. Not as hard as others mind you.
I started as a mechanic. Used to have a blast with the cheetah. Hell, I used one to clear out a blocked storm drain one time. That was hella fun. I do a lot of hydraulics now. Around the 90-100psi, you start to run the risk of injection injury, too. Not likely but possible. That's why they have the safety tips on the blow guns. If the back pressure builds up over 25psi or something, the rubber let's off and let's the air by pass. Had a co worker loose a thumb with a paint sprayer. Got to close with the hand he had thick ass leather gloves too. Unlucky I wasn't there when it happened. probably could have saved it if I rushed him off the e.r sooner but he didn't know then what hydraulic injection is about and brushed it off. He showed me the next day and told me about it. Boy I near threw him over my shoulder and dragged him to get there faster.
^ great response too