Thanks Turk 1, I read through the whole thread, and did searches on other forums. It really does look like this would be a solid 3d engine.
So far, nobody had tried a 16-4, could it if it can turn a 15-8.

BTW, how much thrust would i get out of this 90 turning a 15-6 or 8 prop close to 10,000?

Also, thanks for the comment Ed, if i go with saito, it will be the saito 82.

At the moment I am between the saito 82 and the Sk 91 but am leaning toward the sk because of the price.