Saw an air compressor the other day that is used to run jackhammers, and it was what appeared to be a Ford V8 engine. It used the left bank of cylinders to run and the right bank to pump air. Also heard of guys using a Volkswagon engine to do this (2 cylinders to run and 2 to pump). Anybody ever make a project like this from an old engine sitting around? I was just thinking something like that would sure run my sandblaster better than my 2 HP Sears.