I have been reading here for a while but this is my first post so please bear with me.

My Idea is to fill the normal exhaust port and carve out an exhaust port in each side housing.

If I am right this will give you better control over the timing and more exhaust flow. The exhaust flow could also be limited, like the secondaries are in the intake, to help with torque. But I am getting ahead of my self.

I know you will have to make a custom manifold and make sure the old exhaust port is filled properly and perfectly smooth on the inside. You will also have to modify the cooling lines since you will be cutting into them.
What would you use to fill the port?
Would their be expansion problems?

Am I missing any tasks or pit falls that would be associated with this kind of mod?

Is the mod worth the effort?

Are their any rotary shops that do this kind of work?

I know these are alot of questions and I apreciate any info you can give me.

 

pointless and nearly impossible..... why not just buy renny side plates and save yourself a few years?. Or maybe just stick with the PP exhaust. Side exhaust isnt all that great, it doesnt have nearly the timming of PP exhaust, think honda civic exhaust timming insted of race car. also a good streetport will match its cross sectonal area. The main reason mazda went side echaust is emissions. It alowed them to run zero overlap, The renny would have more power with overlap.

 

You're already wrong...
PP ports flow significantly better.


-Ted

 

thanks for the info

 

not at low rpm.

for a turbo motor, there could be some serious power gains in having a moderate overlap perhipheral intake port and side exhaust ports.

 

And the proof is where?



-Ted

 

Well, there's a better way to go about doing this. If you just buy Renesis rotor housings, you don't have the peripheral exhaust port. Bingo, problem solved.

I think I recall mention of the intermediate plate being a little thicker for more exhaust port volume on the Renesis... so modifying the stock irons wouldn't work too well. In fact, with the stock irons being hollow in places... well.

IMNSHO, side exhaust gives some interesting opportunities in NA motors... possibility of having some of the wilder intake port setups be a bit more streetable because of the exhaust port dwell, for example.

But either way, easier to just start with Renesis rotor housings and irons.

 

Trouble is the rene middle dosen't separate the the exaust port from front to back. so there is no way to actually tun the exhaust. so you would end up breaking even on power at best. But I don't even see that happening.
Now if you could separate the front and rear exhaust pulse in the middle, then you may ba able to get some extra power and still maintain street drivablity since you would be able to stop the exhaust gas bleeding inthe the intake charge as the apex seal slids past the port.