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Old 12-16-2015, 08:30 PM   #1
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Good 12 volt air compressor

I am interested in purchasing a good 12 volt air compressor needing a good solid 110 pounds on motor home tires. Most of what I have reviewed are weak and don't have very good reviews.
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Old 12-16-2015, 08:46 PM   #2
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The ones by Viair are industrial quality.....some of the best made

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Or there is this one which is not bad for the price

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Old 12-17-2015, 08:57 AM   #3
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Check out the Viair products and choose one that meets your needs. They won't be cheap, though.

It's simple & inexpensive to make a small compressor deliver very high psi, but it takes more components and better engineering to produce one that can deliver any appreciable volume of air (SCFM) at higher pressures. If you only need to add a 1-2 psi to a large tire, one of the low SCFM types works ok, but if you need 10 psi in a 22.5" tire, the el cheapo models won't cut it. Get something that has at 2+ SCFM at the pressure you need.
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Old 12-17-2015, 09:15 AM   #4
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Originally Posted by Gary RVRoamer View Post
Check out the Viair products and choose one that meets your needs. They won't be cheap, though.

It's simple & inexpensive to make a small compressor deliver very high psi, but it takes more components and better engineering to produce one that can deliver any appreciable volume of air (SCFM) at higher pressures. If you only need to add a 1-2 psi to a large tire, one of the low SCFM types works ok, but if you need 10 psi in a 22.5" tire, the el cheapo models won't cut it. Get something that has at 2+ SCFM at the pressure you need.
Can you show links for examples of such gadgets that will air up my 22.5's
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Old 12-17-2015, 09:23 AM   #5
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I have an extremeaire compressor on my truck and it has worked flawlessly for well over ten years. 100% duty cycle I have a tank cutoff pressure switch at 145psi. I have it mounted under the truck in a fairly protected area and fabbed a box for it out of some scrap diamond plate I had laying around so while it is somewhat protected it is still outside under the truck and still works great.
https://www.extremeoutback.com/produ...mpressors.html
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Old 12-17-2015, 09:28 AM   #6
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I had a Viair and it broke before even filling up a 2nd tire. But many folks here swear by them, so I think I may just have had a lower end model, or a lemon.

Now I use this one and carry it on board, works like a charm.

Porter Cable CMB15 150 PSI, 1.5-Gallon Oil-Free Fully Shrouded Compressor | ToolBarn.com
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Old 12-17-2015, 12:30 PM   #7
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Can you show links for examples of such gadgets that will air up my 22.5's
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I recently bought one of these. It's up to the task.
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Old 12-17-2015, 12:48 PM   #8
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Originally Posted by TexasTom View Post
I had a Viair and it broke before even filling up a 2nd tire. But many folks here swear by them, so I think I may just have had a lower end model, or a lemon.

Now I use this one and carry it on board, works like a charm.

Porter Cable CMB15 150 PSI, 1.5-Gallon Oil-Free Fully Shrouded Compressor | ToolBarn.com
I use the same compressor. It does the job but sometimes takes a while. I also use a pressure gage with a clip on air chuck. I then wrap a piece of velcro around the handle so it can fill without me having to kneel by the tire.

http://www.amazon.com/gp/product/B00...rch_detailpage
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Old 12-17-2015, 01:24 PM   #9
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I bought this one. Only used it once and it works fine, so no data on durability.

Amazon.com: Viair 40047 400P-RV Automatic Portable Compressor Kit: Automotive
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Old 12-17-2015, 01:34 PM   #10
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So why do you want a 12 volt compressor?
Standard 110 volt compressors are much better at inflating today's large volume high pressure tires, can be found at any Sears, Lowes, or Home Depot, and with a standard extension cord it's easy to reach all your tires.
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Old 12-20-2015, 02:45 PM   #11
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Got the Viair 400P-RV. We have 295 - 80's that require about 123 lbs. Takes care of the job without issues. Worth the $$$.
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Old 12-21-2015, 05:53 AM   #12
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I have an extremeaire compressor on my truck and it has worked flawlessly for well over ten years. 100% duty cycle I have a tank cutoff pressure switch at 145psi. I have it mounted under the truck in a fairly protected area and fabbed a box for it out of some scrap diamond plate I had laying around so while it is somewhat protected it is still outside under the truck and still works great.
https://www.extremeoutback.com/produ...mpressors.html
Those are some awesome 12 volt compressors. If I didn't already have a VIAIR 450-P, I would be all over that 12 volt ExtremeAire Magnum. I hate it when things like this happen.

Anybody in the market for a good-as-new VIAIR 450-P? LOL

Bruce
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Old 12-21-2015, 06:05 AM   #13
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I preferred not to annoy my neighbors with a noisy compressor so I bought a Power Tank. I can set the pressure to 175 psi and quickly top off the 22.5s on the truck and the 17.5s on the trailer. A 10 lb filling lasts more than a year.

Not cheap but no wires to drag around.
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Old 12-21-2015, 04:22 PM   #14
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Ditto on the Viair compressor. I bought mine on eBay for about half of what they cost new. It was new open package but was listed as an off roading item instead of an RV compressor. It worth the money compared to the cheap 12v compressors and a lot handier than the 120 v pancake.
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