Has anyone here ever built an air compressor using two of the four cylinders to pump air?
I need a large compressor and keep eying the old 914 engine sitting there.

I was thinking of making a new intake manifold so two cylinders would get only air. Maybe pull the exhaust pushrods and take the air out of the sparkplug hole thru a check valve.
Or, maybe I could take it out the exhaust ports and leave the exh valve operational.
Now that I think of it, closing both intake and exh valves and using check valves on the intake and exhaust ports would result in a "pump" every stroke.