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Making a under hood air compresser out of AC compr

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JERRY

07-05-2003 19:36:58




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Any one got any good Ideas???




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Roger

07-08-2003 21:05:43




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 Re: Making a under hood air compresser out of AC c in reply to JERRY, 07-05-2003 19:36:58  
It would be nice to add an oil scavenging setup to an AC compressor to get a bit more use out of the oil. Rotary screw compressors scavenge oil by inserting a long metal (copper or steel) 1/4" line right down to the bottom of the air/oil separator filter. This line is then directed back to the intake of the compressor so the oil that is drawn out is mixed into the intake air and returned to the compressor. I am thinking a filter arrangement downstream of the discharge of the compressor, far enough away so it doesn't get too hot, preferably a metal bowl with a sintered metal filter. Most of these bowls have a 1/8' NPT fitting on the bottom for an autodrain. Why not attach a compression fitting and hook up a copper line. Direct this line back to the compressor to return oil to the sump. You would need to perhaps drill and tap a hole in the sump of the crankcase to attach the copper oil return line. Since the compressor is sealed anyway (no PCV valve), would crankcase pressure be a problem? You would have to put a small orifice in the compression fitting at the filter to reduce the velocity of the air/oil mixture coming back through the line. The only downside I see would be moisture in the oil.

Just an idea.

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buickanddeere

07-07-2003 20:00:00




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 Re: Making a under hood air compresser out of AC c in reply to JERRY, 07-05-2003 19:36:58  
Why not have something portable, with warranty, no head aches, works well, has controls,relief,reserve tank and doesn't cost very much and has value. Go to the Home Despot or similar and get a small portable gas or electric compressor.



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big m

07-06-2003 20:53:44




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 Re: Making a under hood air compresser out of AC c in reply to JERRY, 07-05-2003 19:36:58  
Link
Check out this link.



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Richard Fazio

07-06-2003 05:05:00




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 Re: Making a under hood air compresser out of AC c in reply to JERRY, 07-05-2003 19:36:58  
I had one of these also. Worked pretty good. The a/c no longer worked. So I hooked up the compressor to an air hose. When you put on the a/c he compressor would run. Mine did not have a tank. If you had a small tank it would work a lot better. You need a saftey pressure release on the output side. I just came off the output of the compressor to a tee with the saftey, then to a quick disconnect sticking out from the grill. Kept a flex hose in the cab. You do have to keep an eye on the oil in the compressor it will blow out and the unit will lock up.

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Eric

07-11-2003 18:06:52




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 Re: Re: Making a under hood air compresser out of in reply to Richard Fazio, 07-06-2003 05:05:00  
Where is the oil in an A.C. compressor and how do you keep track of it?



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rhudson

07-05-2003 20:36:03




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 Re: Making a under hood air compresser out of AC c in reply to JERRY, 07-05-2003 19:36:58  
my first shop compresser was make from an old ac compresser from a ford car, modified the suction side with a 3/4 npt nipple and used a small spin on oil filter for an air filter. i had to keep an eye on the oil sump level (no longer a closed loop as in freon circuit) it was low on cfm but not pressure.



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Bob

07-09-2003 19:56:22




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 Re: Re: Making a under hood air compresser out of in reply to rhudson, 07-05-2003 20:36:03  
How is an air conditioner compressor normally lubricated?



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T_Bone

07-06-2003 07:41:50




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 Re: Re: Making a under hood air compresser out of in reply to rhudson, 07-05-2003 20:36:03  
Hi Jerry,

Like the others said "piston" compressors work well for air, but radial compressors suck for anything including AC.

I used a small air tank, semi trailer/tractor, with a standard check valve/unloader/contactor combo switch. This lets the compressor build about 125psi, shut down, then blow down the compressor pressure so it'll restart easy.

Add any type of air filter you want including your existing carb air filter.

On the York compressors, Fridgeaire A-4, A-5, compressors also workes well, there is a plug about mid-case that can be used to add oil. I use a squirt can with whatever oil I have, 10w30, 30w, 20w50, etc. about 1pint each time.

If your not in a hurry, I can use my 1/2" impact wrench to remove/install lug nuts. I have two used refrigerant tanks tho.

T_Bone

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