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Old 06-25-2010, 09:56 AM   #1
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On Board Air

Trying to get some ideas where to install on board air and air tank. Would appreciate some ideas. I was thinking of putting the compressor on the drivers side where there is a platform between the fender and firewall but also wanted some ideas on where to but an aux tank.

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Old 06-25-2010, 10:03 AM   #2
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A good place to mount the air tank is underneath, between the frame rails on the driver's side just to the rear of the transfer case. Most of us with OBA systems with York belt-driven compressors mounted our air tanks there where it is out of the way and well protected from damage on the trail. In nearly ten years of use, never did a rock even scratch my air tank even though most of my wheeling is done on the rocks.

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Old 06-25-2010, 10:16 AM   #3
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being lazy I put my tank on the rear fender well. friend mounted his under the battery tray. My next plan is to weld up the roll cage and use it as a tank. for the compressor I use the stock A/C in it's original location.
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Old 06-25-2010, 10:19 AM   #4
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I've just got mine installed a week ago - the compressor is where you thought you might put yours, and the tank is where jerry's is.







Pressure Regulator/Relay is hooked to th firewall and those bars with some zip ties.




The compressor fit was a bit tight and I needed to move the cruise control can up a bit. But I'ts in there quite nicely and doesn't rub on anything so I'm happy.
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Old 06-25-2010, 10:22 AM   #5
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My next plan is to weld up the roll cage and use it as a tank.
Good luck getting it to hold air for long. As many welds as there are on a cage, it's nearly impossible to get a cage air tight.
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Old 06-25-2010, 01:31 PM   #6
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Why do you need a tank? If you are going to run hi volume airtools, like a sandblaster or paint spray gun etc. then yes.
But a small impact will run fine on just the compressor alone.
Usually the purpose of OBA is to re-inflate tires - the compressor can do that without a tank.
A York is pretty bulky, takes lots of room. I use a Mitsubishi - almost the same as a Sanden except for the mounting - they are used on Jeeps and Dodges for AC. Small and round, no tank.
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Old 06-25-2010, 01:41 PM   #7
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A tank is not bulky and requires no useful room unless you choose to mount it where it is in the way. And regarding using a tank with air tools, show me a single shop compressor meant for air tools that does not have a tank.

Then the biggest problem without running a tank as a buffer for air tools is the air pressure switch would be constantly cycling the compressor solenoid on-off-on as the air tool is used. The air tank serves as a buffer so that doesn't happen.

Having run a small out-of-the-way (underneath so it doesn't get in the way) air tank with my York-based OBA system, I would never not want to run a serious compressor setup without a tank. There is no drawback to running a tank and a lot of benefits. Not to mention an air tank significantly reduces the time required to refill tires, all other things being the same.
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Old 06-25-2010, 02:07 PM   #8
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Good points Jerry - The Mitsu or Sanden has either 7 or 9 pistons, so pulsing isn't a problem. It uses a reed valve that switches between them.

I used an airtank for awhile - underneath like you do. One day the hose to it blew - so I bypassed it - a trail fix. I didn't notice any real difference with or without it. Instead of fixing it I took it off.

As far as switching in and out - I use a 90 lbs limit switch - with an airtool it does turn the clutch on and off between bursts - it's that fast. But the clutch is designed to cycle in an AC system anyway.

It inflates a 35 12.5 from 10 to 28 lbs in one minute at idle, revving the engine a little cuts that time down.

Yorks are usually fairly pricey at wrecking yards, nobody wants the Sandens, so they are super cheap.

The most difficult part - I run a short serp belt from the alternator. I got a pulley from another alternator, used a lathe to cut out the center then welded it to the existing alternator pulley, making it a double pulley. That gave a drive pulley for the compressor.

I mentioned it because it's a relatively simple, cheap, and space saving installation. And of course - I don't follow the heard.
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Old 06-25-2010, 02:10 PM   #9
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Yorks are usually fairly pricey at wrecking yards, nobody wants the Sandens, so they are super cheap.
I paid $35 for my used York F210 from my local auto parts junkyard where they had at least a dozen on the shelves for me to choose from.
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Old 06-25-2010, 11:24 PM   #10
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He He - good price! A friend paid I think $125 for one from a pick-a-part. And - the crankshaft was bent! Ya gotta watch what ya get.

Actually I got mine from a Jeep dealer - it was a take-off because it leaked. I took off the end plate and unwrinkled the gasket.

Whatever works for you, this just shows there's more than one way to do it.

BTW - some folks add a separator to drop the oil out, that's fine but they run the drain back into the system trying to recycle the oil. It also catches water (water drops out of the hot compressed air as it cools), it gets into the system too. Not so good.
Best to catch it in a separate container.

A side benefit of the tank is it helps catch the water and oil.

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