Chevy, when I was a teenager, I had a go-kart with twin McCulloch 2-strokes on it. Now, blowers of any kind have been the apple of my eye since day-one out of all the other go-faster goodies available to us nut-cases. (You can see that reflected in the research time given to the above link, a labor of love). So, I'm thinkin', how can I blow these 2-strokes? Well, the most obvious source for makin' one up when you're a teen and down on bucks is the impeller from a vacuum cleaner. Now, I sold the kart before I could bring the project to fruition, but like you, I was thinkin' about how to do it. I still think a 2-stroke that sucks mixture into the crankcase and uses the piston to pressurize it into the transfer ports could benefit from a modest increase over atmospheric pressure to stuff the crankcase. It wouldn't work to eliminate the transfer ports and stuff the mixture directly into the chamber, because it would simply be blown out the other side at the exhaust port.