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On board air with AC compressor

Old 03-25-2019, 11:14 AM
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Year: 1986
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Default On board air with AC compressor

The question on another thread was asked: How do you convert an AC compressor to air compressor?

First you need to know that there is a fundamental difference between the two types of compressors. The oil type air compressors have an oil ring, like an engine does. AC compressors are designed to run with oil dissolved in the refrigerant. In fact when you buy a new compressor it has oil in it that is forced out into the refrigerant from pressure in the crank case of the compressor. So if you run an AC compressor, you need to keep it oiled. Some have used air tool misters and others have dribbles a little oil into the intake when running. But this is a pain in the rear. You can run oil in the crank case if you vent the crank case when it runs. That way any oil is forced back into the crank case by any air escaping past the rings into it. Here is a video of my set up. Bear in mind that this has all the bells and whistles you could want. How much of it you add on is up to you.

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Old 03-25-2019, 11:16 AM
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The minimum you will need is a vent for the AC compressor, a check valve, or back flow preventer in the line, a pressure gauge, relief valve, a pressure valve and a pressure tank. It is easiest to use a manifold to hook up all this stuff on.
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