I noticed that OS makes a 4 stroke engine for RC cars. That would be something to try this on. Might have to make a custom cam to take full advantage of it, but I bet it could work. I imagine it still wouldn't be worth it ($ wise)

Another thing, does this thing have the ability to actually compress air or does it just move air? Why don't any of these people who design this stuff show a test like that? It could be like a leaf blower....moves a ton of air but when it comes to compressing air it generates very little pressure. All this person has shown by putting a piece of paper in front of the outlet is that at most, it's just a leaf blower. That's just more proof that it's worthless and the builder knows it.