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Tire Deflators

Jeepaholic

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Jan 30, 2017
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Northern California, CA, United States
Okay, so lets toss this back. We're all good at deflating. What do you use for a portable inflator? I'm considering this:
https://www.amazon.com/gp/product/B005ASY23I/?tag=wranglerorg-20
Viair 00088 88P Portable Air Compressor
I built a co2 tank. 10 lbs, inflates a 35" tire 16 plus times. It is amazing! This is my full deflate/inflate set up. About $250 for all of it. Works very well, and one less thing to worry about needing electrical power hook up.
20170314_200231.jpg
 

Serbonze

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Okay, so lets toss this back. We're all good at deflating. What do you use for a portable inflator? I'm considering this:
https://www.amazon.com/gp/product/B005ASY23I/?tag=wranglerorg-20
Viair 00088 88P Portable Air Compressor

Here is my reply from this thread: https://wranglertjforum.com/threads/small-compact-air-compressor.387/#post-23790


Just thought that I would add to this discussion since I just bought a Viair compressor. I considered an on-board air option, but I really liked the ability to take the Viair with me in any vehicle. Having it on road trips will be a great option.

I originally bought the 400P like Chris has. I got it home and tested it out, and after one fill up I realized that it wasn't the right model for me. I quickly found that the compressor never shuts off, so the only way to get a pressure reading is to remove the clamp from the valve stem and use another pressure gauge or walk back to the compressor, shut it off, back to the tire to get a reading, back to the compressor to turn it back on, then back to the tire. I'm very lazy, and I just knew that I would eventually get frustrated by either of those two options so I returned it.

A call to Viair solved the issue, as they recommended the 400P-Automatic. That unit shuts off once it reaches 145psi, and uses a standard style inflation gun. It was only $20 more and still provides the same 2.3CFM.

https://www.amazon.com/dp/B000X9B32M/?tag=wranglerorg-20

I swapped out the inflator that came with the compressor for an Astro 3018 igital Tire Inflator. It actually works as deflator too, and is more precise reading for those of us that are OCD about matching numbers. Completely unnecessary, really.
 

Jerry Bransford

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Nov 9, 2015
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11,954
Location
Escondido California
I've had multiple types of tire deflators over the past 20 years but settled on the type of deflator sold by Currie and ARB I bought 12-14 years ago. Their design is faster than most other methods as it uses a cool design that both completely removes the tire stem valve for fast deflations, as well as keeping the valve confined inside so it can't be lost.

This one...

154-0809-01-z%2B10-tire-deflators%2Bcurrie-ez-deflator.jpg


None of the automatic tire deflators I ever used were consistent enough. They'd never get all the tires to the same pressure every time. That was even after I had a set I had owned for some time 'calibrated' by the manufacturer's rep at a 4x4 show. Not to mention they're slow since they only depress the valve stem, they don't remove it. And since these types are all dependent on a small internal spring to know when to shut the air flow off, it's not likely to keep its setting for long.

Even this "octopus" deflator rig I made many years ago that deflated all four tires at once was nothing but a PITA that for some reason that still doesn't make sense never got the tires evenly deflated either. This was slow too for the reason as the automatic deflators, it didn't remove the valve stem.

octopusjpg.jpg


Only my Currie deflator has worked so well that I've never wanted anything else. That it's fast is icing on the cake. That people using those little screw on deflators consistently want to borrow/try my Currie deflator is pretty telling.
 
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05 Blue Unlimited

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Apr 27, 2016
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Oro Valley, AZ,
@Jerry..."a PITA that for some reason that still doesn't make sense never got the tires evenly deflated either."

Your rig is a intresting idea but as you stated it is a PITA. The pressure will never reach equilibrium. It will get close over time but never the same (its a law). As designed there are a a couple of obstacles namely the valve stems but also the T connectors.

These all work to reduce flow which is exactly what you want...a lot of it and fast. Also to work optimally the hose lenghts from each tire to the relief valve should be the same. From a design standpoint you can calculate the flow through each orifice (fluid dynamics) and adjust the componants to optimize the design BUT you will be left with the valve stems which ultimately kill the idea from a time perspective.
 
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