Right now it's a couple of 10b corps. I would also assume it would need to be low pressure too. I can't really imagine smog pumps putting out much at all, lest they would be super chargers..
I had even thought of an aquarium air pump, besides the 110VAC aspect they seem well equipped. They are 100% duty cycle, designed to work with resistance to the pumpage (12"+ of water above them) and are small. Maybe even one of those cheapie tire pumps with no air tank and a piston the size of your fanger would do, they wouldn't be pushing all that hard so the non-100% duty cycle might be OK.
But when the hypoid gets warm I'm sure it slops all over the place, which probably means back into the tubes, when being forced out by air. I want to vent mine up to either the air cleaner or to the top of my snorkle so I'm worried about pluggage. I was thinking a piece of 1/2" copper tube as "hard line" for front/rear with flex lines going to it would probably carry enough volume that even if the fluid did get all up in there, that air could still pass by as it pooled in the lower half of the tube.
I haven't been able to find much on the military apps exact workings. I was wondering if they were positive pressure, and had a short exit tube with water check valve. During normal operations the air is pumped in, and then out, and when the water closes the valve the axle is going to be cooling off and the air shrinkage will be supplimented by the pump. Only problem there is which will leak first, oil seals or check valve, to let the building PSI out? Hmm....
