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Old 06-05-2011, 11:53 PM   #1
Kevbz's Avatar
Join Date: Apr 2011
Location: O'Fallon, MO
Posts: 1,637
New project, OBA system...thoughts

I want to do an OBA system for no other reason than doing it. As for the back story I have a 99 2.5L with no a/c. I put a new altonator on the other day and realized with no a/c I have a ton of room on the pass side (stock airbox is gone also) so got to thinking and figured having no a/c could be a good thing.

My thoughts...

I am going to use a stock a/c compressor as my air source. I am shying away from the york style because of the additional fab work. Also I can then use a stock a/c length serp belt. I can use the pigtail/cannon plug that is just sitting there from the factory harness since i have no a/c to get a switch to the cab to kill the system until I need it (if i can find the other end, i am thinking its behind the climate controls)

Plumb in a small air filter, then inline oiler and then to the intake port.

Plumb out a line with a check valve, then a pressure switch on a tee (thinking 85/on 120/off) then into a tank, then out the tank with a 135 relief valve, gauge to the cab, and enough hose to reach around the whole jeep.

I am not going to use a oil/water seperator because I am not going to be running this for more than tire air and occasional quick air tool/maybe air up an air mattress camping. Maybe if there room and i can plumb it to look nice I will.

I am limited by my tank size. I have two areas under the body, one being right in front of the gas tank up hi, the other being along the frame rail on the driver side, or possibly in the open area when the airbox was. I can find 1/2 gallon up to 2.5 gallon in different configurations (long skinny, short and round) but being online I cant check fit unless i buy them.

Does anyone have a tank mounted under the body or in the engine bay? Anyone know the psi output of a stock a/c compressor? Is a 1/2 gallon a joke in size and not worth it? (its 6"x6.5"x7") what type of CFM's do I gain with a tank? I've heard the a/c compressor air is going to be hot...all copper/brass to the tank or high temp flex lines?

looking for thought and observations...and its much appreciated

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Old 06-06-2011, 02:31 PM   #2
Join Date: May 2010
Posts: 2,220
I'm in the middle of doing the exact same thing.

As far as temp, they supposedly get hot so most people use a small coil of copper pipe on the output of the compressor, which then feeds into the regular high pressure air hose. You could run copper all the way to the tank, but I would say thats way overkill. Everyone so far seems to be OK with just a small coil.

For tank size, I haven't heard of anyone using a 1/2 gallon; from my research, most seem to be using mainly between 1-2.5 gallons with a few 5 gallons here and there. Although I have seen several people not using any tank at all because they were simply using the compressor to fill their tires. Even without a tank it seemed to be working fine, so I'd say you would be OK with 1/2 gallon as long as you remember your limitations with it.

Other than that it sounds like you're on the right path. There is a post in General Discussion on here that has some good info, and there is much more on Do a little searching and you can find a lot of info on the subject.

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Old 06-06-2011, 05:46 PM   #3
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Join Date: Apr 2011
Location: O'Fallon, MO
Posts: 1,637
I was only thinking a tank for the remote chance of a small impact for lug nuts or maybe an air ratchet. I guess theres the cool factor like a gauge in the cab (but I will be out of the cab when using it so...??)

I didnt see much on here but I will check out Jeepforum.
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Old 06-07-2011, 02:13 PM   #4
Join Date: May 2010
Posts: 2,220
Yep, thats what I was going to use mine for. I mainly want it to air up my tires, but I figure there will be that time when it would be nice to run some air tools so I figure I might as well put a small tank in there. Might as well do it right the first time.
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