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Old 11-20-2016, 12:26 PM   #1
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Portable Air Compressors

It's time I quit kidding myself that using my coach's compressed air outlet is a viable solution for keeping my coach tires properly inflated. I can put the air hose on a tire for minutes and see little or no change to the pressure reported on the tire gauge. I don't think it's an issue of insufficient pressure since the system appears to be pressurized to 160 PSI according to the dash gauges. I'm guessing it's an air volume issue. However, regardless of why - it simply ain't getting it when it's time to top off the P295/80R22.5 tires on my coach.

I'm thinking it's time to investigate picking up a compressor that's designed to handle this. Anybody got any suggestions / recommendations for a compressor that will do the job. Again - I'm looking for something that will handle BIG coach tires (P295/80R22.5) inflated to 100+ PSI.
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Old 11-20-2016, 01:16 PM   #2
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Portable Air Compressors

A lot of us use this one.

Click image for larger version

Name:	ImageUploadedByiRV2 - RV Forum1479672989.558771.jpg
Views:	276
Size:	76.5 KB
ID:	144792

It's also sold under the Porter Cable name.

https://www.amazon.com/PORTER-CABLE-.../dp/B006CVXGR0
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Old 11-20-2016, 01:26 PM   #3
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I went with a 12 volt Viair. They have a specific one for RVs but I just went with a lesser version. It works quite well.
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Old 11-20-2016, 04:48 PM   #4
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Originally Posted by Clifftall View Post
A lot of us use this one.

Attachment 144792

It's also sold under the Porter Cable name.

https://www.amazon.com/PORTER-CABLE-.../dp/B006CVXGR0

X2.....takes all the stress out of air pressure issues. Lightweight and takes up minimal storage space.

Key is to get a good quality dual head truck chuck to use with this compressor.

Using a Milton chuck and a Milton dual headed air pressure gauge works well for me.
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Old 11-20-2016, 05:47 PM   #5
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Quote:
Originally Posted by Clifftall View Post
A lot of us use this one.

Attachment 144792

It's also sold under the Porter Cable name.

https://www.amazon.com/PORTER-CABLE-.../dp/B006CVXGR0
I have the Porter Cable version of this. Put a good truck tire air chuck on it with quick connects. Works great. Easy peasy.

Vince
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Old 11-20-2016, 06:00 PM   #6
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I started with an electric pancake compressor that could deliver >125 lbs but replaced it with a ViAir 12v portable unit. Love the ViAir. Expensive, but worth it, IMO.
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Old 11-20-2016, 07:34 PM   #7
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I have the Porter Cable version of this. Put a good truck tire air chuck on it with quick connects. Works great. Easy peasy.

Vince

x2 Finally got it after being frustrated with two of the little V -air things. This fits nicely in the rear storage compartment and makes life much easier. ?Can air up anywhere.
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Old 11-20-2016, 07:41 PM   #8
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We have the Porter Cable and love it. BUT one of things that make it easy is a straight lock on air chuck like this one: CTA Tools 1930 Straight Lock-On Air Chuck. Easy Peasy
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Old 11-20-2016, 07:42 PM   #9
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I went with the VIAIR 450p works just like a compressor that has a tank but doesn't. No need to switch it off between tires as it has a pressure switch built in. Solid unit, built like a tank but not cheap. You usually get what you pay for.


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Old 11-20-2016, 09:05 PM   #10
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If you have a generator, is there any advantage to a 12v over a portable 110? I understand that 110 will have more oomph (technical term) than the 12v.
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Old 11-20-2016, 09:18 PM   #11
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If you have a generator, is there any advantage to a 12v over a portable 110? I understand that 110 will have more oomph (technical term) than the 12v.
I have the Viair RV unit. It is more easily stowed, lighter, and quieter than my AC-powered compressor. It does have less oomph, but I can top off my tires to 100 PSI easily. I do not like the coiled hoses, but the do reach from front of 34' MH to rear tires if stretched out. Straight hoses would be better.


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Old 11-20-2016, 09:29 PM   #12
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If you have a generator, is there any advantage to a 12v over a portable 110? I understand that 110 will have more oomph (technical term) than the 12v.
I went with the 110 because its easier to get to a 110v outlet than my batteries plus I can use the compressor around the house as well for small jobs
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Old 11-20-2016, 11:36 PM   #13
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I had the same problem and replaced the air chuck with a good quality one from NAPA Auto Parts. We had a bad chuck and the problem is solved.
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Old 11-21-2016, 06:03 AM   #14
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Originally Posted by SpaceNorman View Post
It's time I quit kidding myself that using my coach's compressed air outlet is a viable solution for keeping my coach tires properly inflated. I can put the air hose on a tire for minutes and see little or no change to the pressure reported on the tire gauge. I don't think it's an issue of insufficient pressure since the system appears to be pressurized to 160 PSI according to the dash gauges. I'm guessing it's an air volume issue. However, regardless of why - it simply ain't getting it when it's time to top off the P295/80R22.5 tires on my coach.

I'm thinking it's time to investigate picking up a compressor that's designed to handle this. Anybody got any suggestions / recommendations for a compressor that will do the job. Again - I'm looking for something that will handle BIG coach tires (P295/80R22.5) inflated to 100+ PSI.
Your air system runs between 120 and 130 psi, not 160.

There is also a flow problem due to the lenghts of small lines and regulators running from the tank to the air fitting and then thru the hose you use. All of this adds up.

The static pressure will be there but while flowing, no to much.

It's the same reason the tire guy has a big hose on the big tire gun.
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