Rotary porting faq
 

http://www.rotaryengineillustrated.com/porting/15.html

Actually there's alot of good stuff on the site. Just browse around! Enjoy rotofiles!

Edit: Here's how this thread is going to work.

Post a link. Post a diy faq. Anything really that adds to the thread......

I'm doing motor research again and this idea just popped into my head.