Thoroughly frustrated with my deflators

WLDRIDE

WLDRIDE

WLDRIDE
Supporting Member
Joined
Oct 12, 2019
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Location
SouthCentral Colorado
So, upon recommendation from this group, I purchased Coyote deflators. I bought the set that is supposed to come preset from the factory at 12psi. They actually ranged from 11.6 to 13. I chatted with Harry (the inventor), via email, and he told me that he allows the factory a variance of 2 psi, plus or minus, when they ship them. So, okay, I spent quite a bit of time several days ago getting them dialed-in to 12.3, 12.4, 12.4, and 12.5 (Anything between 12 and 12.5 was going to be close enough for me.)

I went wheeling yesterday and used the newly-dialed-in deflators without a second thought. But, when I got home, and went to re-inflate my tires, I found them to be 10.8, 11.3, 11.2, and 12.7. And this was right after several miles of highway driving, so the tires were warm. Bummer.

Thoughts?
 
Spring loaded pressure regulators are rarely that precise unless they are used for laboratory/medical purposes.
Air pressures that low... can cause small bead leaks on the trail when the side walls are flexed against obstacles. There could be some sand or small debris between the tire bead and the sealing surface of the rim causing the air pressure to slowly leak out.
If you are concerned about bead leaks; spray some soapy water at the tire bead to see if there is a slow leak.
 
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If you aired down immediately after driving theres a good chance they will be higher than after sitting for a while and the air cools off. The last wheeling trip for me aired back up to 28 psi after running 10 psi all day and the next morning I checked and they were all 23-24 psi once the air cooled off
 
Loosing a bead isn't the end of the world. I wouldn't worry at all until I got below 7 psi. Visually it will be really obvious when your tires get that low. You might consider airing them down to 5psi so you know what it looks like. Then take them to 7 and 10. That way you can always double check with a quick walk-around. Once you see how low 5 and 7 really are I think it'll put you at ease.
 
mrblaine said:
Based on everyone's mortal fear of losing one, I suspect that they believe it is gone forever never to be found again.
Click to expand...
Much like any activity if you push the limits things happen. Losing a bead is generally not one of the things to fear. Now if it happens every 50’ then it’s a problem.

This also assumes you prepare accordingly.
 
Apparition said:
I think it was @Mr. Bills that knows all about these
Click to expand...

I own Coyote deflators, use them frequently and recommend them, if that is what you mean.

As far as knowing "all about them," the person to correspond with would be Harry Llewellyn at Coyote Enterprises. He knows more about tire deflators and how the various options in the marketplace operate than anyone, anywhere.

The comment, "spring loaded pressure regulators are rarely that precise unless they are used for laboratory/medical purposes" has no application to Coyote deflators and exhibits a lack of product knowledge about them.

Unlike Stauns and many of the cheap Chinese knockoffs, Coyote deflators have a lock collar that allows one to "use an open end or crescent wrench-like tool to safely lock-in your destination pressure setting with peace of mind that it will stay set forever."* Coyote deflators are also advertised as being capable of having "destination pressure repeatability within ± 0.2 PSI."* They are made in the U.S.A. (Staun's are made in Australia), and come pre-set from the factory at 12 psi +/- 2 psi or you can have Harry Llewellyn set the pressure for you at your specified value +/- 0.5 PSI.

I respectfully submit that such accuracy and repeatability is more than sufficient for airing down jeep tires, even to pressures lower than @WLDRYDE's desired 12 psi. I think the variance in pressures he experienced was related to changes in ambient temperature, tire temperature, etc. and that after using his deflators a few times he will zero in on his "forever" setting which may or may not be his initial 12.0-12.5 value.

Now as to @WLDRYDE 's tire with the greatest pressure, what position was it in on the vehicle? Is there any reason it might have run slightly hotter resulting in slightly higher pressure? Alignment, toe-in? Its a slippery slope that I would avoid if I were him. Just use the deflators and go have fun. :)

______________________________________________
* The Coyote Enterprises product description and FAQ pages should answer most questions and eliminate many common misconceptions about accuracy and repeatability:

https://www.coyoteents.com/deflators/
 
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Mr. Bills said:
I own Coyote deflators, use them frequently and recommend them, if that is what you mean.

As far as knowing "all about them," the person to correspond with would be Harry Llewellyn at Coyote Enterprises. He knows more about tire deflators and how the various options in the marketplace operate than anyone, anywhere.

The comment, "spring loaded pressure regulators are rarely that precise unless they are used laboratory/medical purposes" has no application to Coyote deflators and exhibits a lack of product knowledge about them.

Unlike Stauns and many of the cheap Chinese knockoffs, Coyote deflators have a lock collar that allows one to "use an open end or crescent wrench-like tool to safely lock-in your destination pressure setting with peace of mind that it will stay set forever."* Coyote deflators are also advertised as being capable of having "destination pressure repeatability within ± 0.2 PSI."* They are made in the U.S.A. (Staun's are made in Australia), and come pre-set from the factory at 12 psi +/- 2 psi or you can have Harry Llewellyn set the pressure for you at your specified value +/- 0.5 PSI.

I respectfully submit that such accuracy and repeatability is more than sufficient for airing down jeep tires, even to pressures lower than @WLDRYDE's desired 12 psi. I think the variance in pressures he experienced was related to changes in ambient temperature, tire temperature, etc. and that after using his deflators a few times he will zero in on his "forever" setting which may or may not be his initial 12.0-12.5 value.

Now as to @WLDRYDE 's tire with the greatest pressure, what position was it in on the vehicle? Is there any reason it might have run slightly hotter resulting in slightly higher pressure? Alignment, toe-in? Its a slippery slope that I would avoid if I were him. Just use the deflators and go have fun. :)

______________________________________________
* The Coyote Enterprises product description and FAQ pages should answer most questions and eliminate many common misconceptions about accuracy and repeatability:

https://www.coyoteents.com/deflators/
Click to expand...
From reading your previous posts on them you’ve nearly convinced me to buy a set. So in my mind, you know all about them. Maybe not everything though ;)
 
Mr. Bills said:
I own Coyote deflators, use them frequently and recommend them, if that is what you mean.

As far as knowing "all about them," the person to correspond with would be Harry Llewellyn at Coyote Enterprises. He knows more about tire deflators and how the various options in the marketplace operate than anyone, anywhere.

The comment, "spring loaded pressure regulators are rarely that precise unless they are used for laboratory/medical purposes" has no application to Coyote deflators and exhibits a lack of product knowledge about them.

Unlike Stauns and many of the cheap Chinese knockoffs, Coyote deflators have a lock collar that allows one to "use an open end or crescent wrench-like tool to safely lock-in your destination pressure setting with peace of mind that it will stay set forever."* Coyote deflators are also advertised as being capable of having "destination pressure repeatability within ± 0.2 PSI."* They are made in the U.S.A. (Staun's are made in Australia), and come pre-set from the factory at 12 psi +/- 2 psi or you can have Harry Llewellyn set the pressure for you at your specified value +/- 0.5 PSI.

I respectfully submit that such accuracy and repeatability is more than sufficient for airing down jeep tires, even to pressures lower than @WLDRYDE's desired 12 psi. I think the variance in pressures he experienced was related to changes in ambient temperature, tire temperature, etc. and that after using his deflators a few times he will zero in on his "forever" setting which may or may not be his initial 12.0-12.5 value.

Now as to @WLDRYDE 's tire with the greatest pressure, what position was it in on the vehicle? Is there any reason it might have run slightly hotter resulting in slightly higher pressure? Alignment, toe-in? Its a slippery slope that I would avoid if I were him. Just use the deflators and go have fun. :)

______________________________________________
* The Coyote Enterprises product description and FAQ pages should answer most questions and eliminate many common misconceptions about accuracy and repeatability:

https://www.coyoteents.com/deflators/
Click to expand...
Someone needs to put their rig in the shade, let it sit there for a few hours and then make the pressure in all the tires the same. Now pull it out into some place where the sun is on one side of the rig and the other side is in the shade. Let it sit that way a few hours and then check the tire pressure. Report the results.
 
Apparition said:
From reading your previous posts on them you’ve nearly convinced me to buy a set. So in my mind, you know all about them. Maybe not everything though ;)
Click to expand...
Harry is the only one out there in the deflator business who came up with a unique way to control the pressure and unique enough that he got a patent on it.
 
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mrblaine said:
Someone needs to put their rig in the shade, let it sit there for a few hours and then make the pressure in all the tires the same. Now pull it out into some place where the sun is on one side of the rig and the other side is in the shade. Let it sit that way a few hours and then check the tire pressure. Report the results.
Click to expand...

Its raining today.

Maybe tomorrow.

But maybe not.

I'm awfully busy being retired.

;)

____________________

Newsflash/Edit:

As usual, Harry Llewellyn has already done this experiment and more. His article, Temperature and Tire Pressure, is here:

https://www.coyoteents.com/temperature-and-tire-pressure/

If you read the article carefully with some attention to Mr. Llewellyn's methodology and reasoning you will understand why @mrblaine speaks highly of him.
 
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Never had much problem with the Stauns deflation pressure drifting once I set them.
This set of deflaters have a knurled lock ring to hold the pressure setting.
This set was purchased around October 2003.

As for leaving a vehicle in the sun; the pressure in the tires can vary as much as 5-7 psi depending upon the ambient OAT. Airing the tires up or down at one elevation and driving to another elevation will also change the tires air pressure.
 
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Pull the core out...once they start to whistle put the core back in. It's about 9 psi on my setup. Close enough. If it wheelhops I let more out.
 
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What bothered me was that, after spending hours setting the deflators in the "lab" of my driveway, and getting them dialed-in to the point that they were all between 12.3 and 12.5, they were then so far off out in the "real world" of the backcountry. Sun was not an issue, it was a cloudy day. None of the tires were slowly leaking around the bead; that wasn't the case before or after this wheeling trip. At least for me, they have not proved to be "accurate within ± 0.2 PSI."
 
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