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onboard air compressor


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14 replies to this topic

#1 crockettbrat

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Posted 20 June 2007 - 12:03 AM

Hey there:

Has anyone here modified the a/c compressor to compress air? I've found some good stuff on line, and think I might go for it during the ej swap. Just looking to see if someone here has already done it. My brat has a/c and the ej22 donor has a compressor too. Instead of having a/c I thought it would be slick to have compressed air for tires and tools, ect. There seems to be plenty of room for a tank behind the seats in the bed, or maybe even under the bed. Any thoughts would be appreciated.

Daniel

#2 nipper

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Posted 20 June 2007 - 12:14 AM

The AC compressor uses the oil in the refrigerant as a lubricant, so you would wipe it out. Some compressor have oil in a crancase, but they still use the refrigerant to help lubricate the moving parts.

What do you want to do with a compressor?


nipper

#3 crockettbrat

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Posted 20 June 2007 - 12:51 AM

The AC compressor uses the oil in the refrigerant as a lubricant, so you would wipe it out. Some compressor have oil in a crancase, but they still use the refrigerant to help lubricate the moving parts.

What do you want to do with a compressor?


nipper



Air up tires after being on trail, run air tools. An inline oiler would have to be installed to the air inlet side and a filter to capture oil on the outlet side would be installed to keep oil out of your tank, tires, ect. The oil captured in the outlet filter can be then piped back to the inline oiler.

#4 nipper

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Posted 20 June 2007 - 09:52 AM

A while ago someone else wanted to do the same thing, and it was just easier to install a regular air compressor.

Even if you could use the OE AC compressor, you still need an air tank. Also a subaru AC compressor may not move alot of CFMs

Now if you use an older york style compressor
http://coloradok5.com/york.shtml

i just dont know if it will fit under the hood.

nipper

#5 grossgary

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Posted 20 June 2007 - 10:09 AM

how much do you plan on using it. alot or emergencies? for emergency use i'd just have an extra tank to throw in the back whenever you go wheeling. fill the tank at home with your compressor and take it with you. then it's not always there and you have to worry about mounting, lines and the a/c deal.

you can get a power inverter. check loads and demand and this might be all you need for emergencies. or install another alternator and maybe you can roll your home compressor right in the vehicle with you.

#6 GeneralDisorder

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Posted 20 June 2007 - 11:14 AM

Talk to Jerry (bratsrus1). He has a air system using an EA81 AC compressor in his lifted hatch. Works great. He used a semi tractor air tank, and it's got a pressure guage on the dash. I've seen it in action - pretty cool.

This is a common mod for on-board air systems actually. The oil for the compressor largely stays IN the compressor (unless you roll the vehicle) and you can add a bit now and then just like with any air-tool as the ports are on top of the compressor.

If all you want is to air up a tire, a lot of folks in the off-road community just carry two spares inflated to 70 psi, and a hose fitted with two locking shrader adaptors. This way you can repair a punctured tire then hookup one of the 70 psi spares to it and you will have two 35 psi inflated tires as the pressure will equalize between the two. Most quality tires have no issue with being inflated to this level - they are over engineered anyway, and remember that a 35 psi inflated tire will have quite a bit of expansion anyway as the road heats up the tire and air inside. A cool tire with 70 psi isn't much of a problem. SOA ran 60 psi in the little Justy LSR bonneville racer to reduce it's rolling resistance - those were 12" tires running at 120 MPH !

GD

#7 nipper

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Posted 20 June 2007 - 11:52 AM

i like the 70psi spare tire idea.....

nipper

#8 crockettbrat

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Posted 20 June 2007 - 12:39 PM

Great ideas everyone.

I think the real deal is that I'm having a blast playing with this brat, and my work schedule is allowing me time to goof off, so I keep creating projects that I "need" to do. This onboard air project is one of these things. I'm also the guy in my group of friends who gets the call when someones vehicle is in need of assistance. Having the ability to bring air tools along and not a compressor would be fantastic, so I think I'd use it often. I'll post as I move forward on this.
thanks USMB:clap:

#9 Scott in Bellingham

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Posted 20 June 2007 - 01:52 PM

Great ideas everyone.

I think the real deal is that I'm having a blast playing with this brat, and my work schedule is allowing me time to goof off, so I keep creating projects that I "need" to do. This onboard air project is one of these things. I'm also the guy in my group of friends who gets the call when someones vehicle is in need of assistance. Having the ability to bring air tools along and not a compressor would be fantastic, so I think I'd use it often. I'll post as I move forward on this.
thanks USMB:clap:


keep us updated as Im planning on doing this on my EA82 wagon

#10 baccaruda

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Posted 20 June 2007 - 02:37 PM

get a stock air compressor from a GL10 that had air struts, or same from a Cadillac or Lincoln or somesuch.

#11 nipper

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Posted 20 June 2007 - 03:43 PM

The CFM is too low for air suspension on a car. The airlines were really small, so he could never run an airtool enough to make it worth while.

another link

http://www.4crawler....nBoardAir.shtml

google on board air compressor, you will get more ideas.


nipper

#12 bratsrus1

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Posted 20 June 2007 - 10:53 PM

Hi This is Jerry, come to the show and you see my on board air system that i have on my hatchbrat. I have it set at 125 psi works really good, the air horn works really good also honk honk.:grin: Thanks Jerry

#13 crockettbrat

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Posted 21 June 2007 - 12:20 AM

Hi This is Jerry, come to the show and you see my on board air system that i have on my hatchbrat. I have it set at 125 psi works really good, the air horn works really good also honk honk.:grin: Thanks Jerry


Hey Jerry:

I wish I could make it this year. Maybe next year. I didn't know I was going to be a subaru owner until a few months ago and didn't find the USMB until after that. My summer vacation time was already planned. I'm having a blast with my brat and will pm you when I get moving on my ej swap for one of your kits for the 5sp d/r install. I'd love to see pics of your ride and onboard air, or maybe I'll see it next year. Thanks.

Daniel

#14 WoodsWagon

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Posted 21 June 2007 - 10:02 PM

A while ago someone else wanted to do the same thing, and it was just easier to install a regular air compressor.

Even if you could use the OE AC compressor, you still need an air tank. Also a subaru AC compressor may not move alot of CFMs

Now if you use an older york style compressor
http://coloradok5.com/york.shtml

i just dont know if it will fit under the hood.

nipper


I saw one of those under the hood of a 74 subie wagon, being used as an aftermarket AC system. Those compressors are BIG.

#15 kiwi subbie

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Posted 22 June 2007 - 10:32 PM

there was this big green toyota at my old course that was fitted with an electric compresser for running stuff off it like airtools and stuff. it was cool :burnout:




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