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Re: AIR COMPRESSORS CFM RATINGS [message #124992 is a reply to message #124984] Sat, 07 May 2011 13:49 Go to previous messageGo to previous message
Carl S. is currently offline  Carl S.   United States
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma:
Senior Member
Peg wrote on Sat, 07 May 2011 10:37

Carl S. wrote on Sat, 07 May 2011 11:36

Here is what I went with:

http://www.gmcmhphotos.com/photos/showgallery.php?cat=5506

The explanation is in the captions. My original Dana compressor would pump up the tank to 140 PSI, but made an embarrassing amount of noise doing it. The new Viair is much quieter and does the job in less time. It is a 100% duty cycle unit and specs can be found on Viair's web page. There are some 25% and 35% duty cycle units that actually pump at a higher CFM rating, that would also be more than adequate since they do not operate constantly.

Jim K. also has a (I believe Firestone) compressor on his site that is a bit larger and will pump up the system faster, if you feel you need that.

I have put a considerable amount of time into my air system, including JR Slaten "Power Level II" dash valves, an electronic regulator, from Jim B. an adjustable safety valve, from Jim K, and numerous nuts and ferules, to stop annoying leaks.


Nice set up Carl.
Quiet is good and we haven't even gotten to the generator. Rolling Eyes
Thanks for your link to your documentation. I love it when the links are in the post....Saves us newbies from doing a search and getting lost. I personally forget what I'm searching to find because I get fixated by some other thing regarding GMC motorhomes that came up while I am doing a web search to find a person that was mentioned in a thread as an expert or a source...
A.D.D kinda...or maybe is...never was a medical condition when I grew up...So maybe I have it...doesn't matter...I enjoy the links for less complicated research without distraction.


Thank you.

It took me quite a while to get the air system sorted out. The P.O. didn't use it and just filled the air bags using Schrader valves at the bags.

I started with the obvious leaks, Fittings on the air lines, the pressure regulator, the safety valve, etc. I eliminated the switch that turns on the dash light (low air light) because Jim B. told me that was usually a source of leaks. I wired the compressor to a relay and added a second relay to turn on the low air light, so I can see when the compressor is running. I still had leaks and finally traced them to the Power Level valves. After I replaced those, things were much better.

At a Saguaro Jetset rally last year, I pulled in to the RV park with my compressor running, and Steve Ferguson came up to me and said "that's the noisiest Dana air pump I have ever heard". I hadn't had anything to compare it to, so I didn't realize... I had been wanting to do something with the compressor and, weighing my options, decided to spring for the Viair that Jim B. handles,instead of rebuilding the Dana. It works well for me.

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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