I've been playing with the idea for an OBA. What I'm thinking about is a small(2-3gallon) tank mounted under the frame. Then mount a 12v pump to it. Something like the ones you see at Wally World for ~$50 or so. You could wire a switch to turn it on and off with a pressure valve to shut it off at a given pressure. I realize it probably wouldn't power air tools for long, but to air up it might work. What ya think?

Keith

I have been kickin around the same idea for awhile. I have a tank and a 12V compressor (labeled 'truck':rolleyes: ), i think i'll mount in in my ZJ for airing up chicks at the mall with flats:D I just keep the ZJ around to haul my dogs, they love to ride, i've got other rigs to wheel so I don't want to put a bunch of money in it that could be spent on my trail rig. But on board air is a good thing to have...I think i'll get out in the garage Thursday and see what I can fab up. I'll post anything I come up with.

Let me know how it works out. With a flatty spare space is hard to find. And there's this space between the rails behind the rear axle that looks like it would be perfect for that.

Keith

I think a 3 gallon tank will air up a 33 from trail to street, but not more, then you are just working with the output of the electric.

Before I put my york in I ran a small caddy electric with my 2.5 gallon tank.

I did reseat a bead with it, and did air up tires a couple of times but it was sloooooow.

Keep in mind the puny electrics get even slower at altitude so if you are wheeling up in the mountains they really suck.

Well I guess that kinda shoots that idea in the a$$. Should have figured someone would have already tried something like that. Guess I'll have to make room under the hood for a York. Thanks for the reply.

Keith

Originally posted by Cutter
... i think i'll mount in in my ZJ for airing up chicks at the mall with flats:D ...

Rememeber Lewis, you have to plug their ears when you start to air the chicks up or you can't properly seat the bead.....

Ed

Ed, don't you have to go and extend the wheelbase on your mower or something?:D

I'm temporarily using this set up with a 5 gallon tank (XJ's are good for something) I can fill 2 tires quick and that's about it, not to mention it takes forever to fill the tank.

If you're dead set on 12V air, pick up a rear A/C compressor from an '88 or newer GM Suburban. It's an A/C compressor that runs on 12V power. I don't think you'll be able to run tools on it, but at least it'll fill tires.

If your throwing the 12 volt compressor idea around why not buy several of them and tie them in together. Redrum runs 3 of them I think. Speeds things up a little rather than having 1 compressor trying to fill a 3 gallon tank you can tie 2, 3 or whatever together. Just a thought in my puny mind.

There was a guy in the DFW area that had done this with 2 of those 12v pumps and a fire extinguisher tank. Seemed to work fairly well.

Funny you should mention the multi-pump setup. The idea popped in my head too. You can get a few of those air-ride suspension pumps nice and cheap, mount 'em up and dump them to a tank.

...but all in all, you're wasting a bit of space for something that can be taken care of by one York.

The guy running those compressors from DFW is Redrum. He can fill tires up at a decent speed and pop beads back on. If it works and you want to try it...go for it.
I run a York and love it.

My york will run an impact gun with a 1 gallon tank.I was going to
use 2 one gallon tanks because they would be easier to mount than 1 big one. Haven't gotten the second tank yet and not sure that I need it. You can't beat the york.:skull:

well, I set up my little tank and pump on the bench today...19 min to fill a 5 gal tank. Aired a tire down to 8# and it took a looong 25 min to get to 24# (my normal street pressure) and the pump stopped on the first and only tire, came back on later so I guess it has an internal breaker. I say it failed the test;)

I timed airing up one tire in my garage using my caddy compressor and it was about 10 minutes from 8 to 25 (35x12.15 on 8" wheel) But my garage at elevation 770 feet.

When I aired up at Loon lake, elevation about 6400, the set of four took like an hour and 15 minutes. and I had a 2.5 gallon tank at 110 psi for starters.

Here's a good link with some useful info

http://4crawler.cruiserpages.com/4x4/CheapTricks/OnBoardAir.shtml