Is there any type of cheat sheet somewhere that gives the pipe diameter for certain size turbines? I'm mainly interested in the diameter for a K320. Also want to know if the 320 is limited to 50 or so pounds of thrust, can I use a smaller diameter? I have a scratch build project starting soon, and a 110mm is all I can fit. I already have a 320 sitting on the shelf and would rather not buy a smaller engine.

Thanks!