Here is my 8 gallon air compressor doing work. I needed lots of air and had not ran this thing in a few months so I figured I would drag it out.
Its a 5hp 30+ year old briggs and Stratton. The compressor is a siamese twin cylinder. Uses most of what little power the 5hp engine can make.
This is the compressor I want to replace. The tanks are rusted from years of having the drains replaced with pipe plugs (not by me). I have a Honda GX200 engine and I was going to make the air tank about 12 gallons and I was going to use the same compressor unit, just drive it a little faster with a bigger engine pulley.