I'm interested in building a surface supplied air compressor for two divers.
22 cfm@150 psi. I know that the big difference is vegetable oil in the
crankcase vs. petroleum based oil, but just wondering if anyone had any
experience with this. A new one especially made for diving is going to run
about $7500, and one could be put together from components for less,
provided the air generating part is compatible with breathing air.

Anyone?

Steve