Originally Posted by lotus
Can I use the GM type A/C (round) compressor for onboard air or do I have to find a york? Do I need to add something to lubricate it since it is a dry comp?
I won't consider a Sanden or other type of radial compressor for an OBA compressor,
Simply because they don't have a 'Wet' crankcase.
Since the radial compressor doesn't have an oil reservoir, you have to add an oil 'mister' in the intake tract, then use an oil separator to get the piston lubrication back out of the air stream after the compressor,
You wind up with a dry compressor that doesn't last long, or you wind up with an air tank full of oil muck.
A York still needs an oil separator after the compressor, but since it is crank case oiled, and the intake air is NOT being injected directly with oil, there isn't very much oil that comes through a York.
It's very manageable.
The third choice for OBA compressor is an 'Oil-less' electric compressor.
No oil issues at all with an electric compressor, and if you aren't constantly using the compressor (and most of us don't) the electric is much easier to mount, cheaper and cost effective.