Have you guys notice that the renesis 13b rotor housings have this indentation on what use to be the exhaust port. Like if this was intentional by mazda since older 13b housings are becoming more scarce,This indentation plus some machining and machining a sleeve could enable the peripheral exhaust port..

What you guy's think??

 

I think the problem would be cooling the sleeve. It would have to be some type of threaded insert because if the temperatures involved would make any epoxy or adhesive fail in that area.

 

It wasn't "intentional" but it was for a reason. They used as much of the old tooling as possible.

I don't know about the RX-8 engine or the FD, but even a series 5 FC rear end housing has the boss machined and tapped for a top-mount starter that they haven't used since, what, 1973?

All Series 3 engines have a boss for a turbo oil return in the front cover, too.