Build Or DIE Trying! a 1993 FD story by Tem120

3 minute(s) of a 128 minute read

the reason you cant rev a rotary to 20000 RPM is because after a certain RPM , The Eshaft starts to flex and that flex causes wobbling of the rotors , 

So if you lighten the rotors the flexx is LESS on the E shaft 

But then , You clearance the rotor , for when it DOES flex even despite the lightening , The sides of the rotors will wobble some and when it does normally the rotors will contact the irons , but by removing and clearancing when it wobbles it has More room where it wont contact the Irons . so you can rev the motor even higher 

scalloping what that does is it is sorta the inverse of a port the rotor iselve's edge will be incontact with the port , since you have a limit of howmuch you can port the irons without ruining the engine , This allows for quicker opening of the ports , 

, and then ofcourse balancing at your target RPM range so that when you do Rev the crap out of it any wobble is minimized by being balanced . 

basically those rotors have had the WORKS done to them LOL