Can you swap out a rotary engine for a 4 cylinder?

 

sure, with enought time/skills/money u could do anything

 

I'm pretty sure someone on torquecentral.com has done that. Search that site and you should come up with it. I don't believe anyone is going to offer the correct mounts for it so you'll probably have to make your own or have them made. That's the hardest part of the whole thing - once your motor and trans are in, you just need a driveshaft to mate the two and the rest of the swap is just like any other.