turbo vs. supercharger

[madmax]

I've been on this forum for about ten years. Been lots of talk about 2-stroke superchargers. Portgrinder may be the only one that has come close to get it to work. Many have tried and failed. Too bad we cant pull up the old forums.

The year the M7 came out Mac at Mountain performance started advertizing a supercharger kit for the M7. Never made it to production. I've been into his shop and talked to him a number of times. Says he has some patented gaget that goes on the exhaust side of the motor to deal with the back pressure issues. He told me that after losing 2 diamond drives in the test M7 he gave up and would just concentrate on 4-strokes. Dont know if I believe it, the diamond drive holds up pretty well on some high hp turbos, why not on his supercharged M7?

 

[portgrinder]

This is why a turbo works. It is and infinatly variable exhaust restriction that happens to make boost while praportionally keeping the exhaust pressure higher.

A computer controlled exhaust restiction could do the same thing for a supercharger but has not been done yet.

We got close. Problem was we were trying to also make it "clean" at the same time and our Cat's melted the sh*t out of our valve system.

I got to play around with sleds alot. With other peoples money. Probly why I damn near failed engineering. Twice we put streetbike engines in sleds. They worked awesome, and this was before yamaha did it. Dry sump, trans removal, cable steering, custom efi, pretty sweet.

That was about 10 times easier than trying to get a supercharger to work.