20bfd3s

goal is to archieve 450hp on the renesis turbo engine in rx8.
is it possible to fit 13-rew 8.5 CR rotors to the renesis engine?
is there any porting available for renesis?
i thought to fit 13-rew to rx8 but engine mount is very different... thus probably better is to rebuild renesis.
please advice.

slo

iTrader: (1)

Try posting this on an Rx8 forum.

BTW the 13b-rew came with 9.0 CR rotors. Its the S4 T2 that came with 8.5CR.

I think in the very least the rotors would need to be scalloped like the Rx8 rotors are

diabolical1

iTrader: (3)

i've seen pics of ported Renesis housings around here somewhere. i'm tempted to say they were done by guitarjunkie28, buy don't hold me to that.

rotarygod

iTrader: (1)

The Renesis uses different side seals. They are wedge shaped to help keep carbon buildup out of them. Some people feel that it may be possible to machine out the 13B rotors to accept the Renesis side seals but they are also 2mm farther out towards the edge of the rotor. The rotors are also shaped slightly different. The 13B rotors are more "round" in profile while the Renesis rotors are more "triangular". Hopefully you understand what I mean. It is hard to tell by looking at them individually. You just have to see them next to each other. As a result of this slightly different shape, the side seals are also shaped slightly differently. You can probably get away with not using a cutoff seal but the side seals are the biggest issue to work around.

BLUE TII

iTrader: (9)

As far as sideseal design, from what I've seen on my 13BTs lots of good smokeless premix and emmisions removal will definitley keep you carbon free and is probably a good idea on 450RWHP 13B.

Rotary God- Would the position of the 13BT sideseals on the rotor work w/ the early opening Renisis port or would it drop the leading sideseal edge into the port as I am thinking it would?

Hmm, so Renisis rotors in earlier 13B would allow earlier port opening...

Node

iTrader: (1)

I've seen a REW mounted in a RX-8 at sevenstock. No idea how though.


As for fitting 13b rotors into a renesis, you would have to mill your own extra side seal slots in them. I'm also not sure if the normal side seals are in the same position or not.
The RX-8 also runs a shorter apex seal to reduce wear since it doesnt have to be strong enough to sustain moving over the peripheral exhaust port.
I'm sure a normal 13b apex seal in a 13b rotor would work if you could make the new side seal slots.

Also on the renesis they run real sloppy clearances on the side seals which is one reason why they are having a lot of possible engine recalls.

You could possibly mill the rx-8 rotors combustion chamber, but they are a supposedly shitty cast (compared to previous designs) to begin with, and probaly don't have a whole lot of meat.

It will be a pretty hokey set up no matter what. But defiantely look into machining the extra side seals.

And now that I think of it. I'm positive that the 13b side seal position is different from the one on the renesis. The 13b's side seals contact the corner seal and the renesis is further back or something like that.


Theres a good thread on no pistons by judge ito and crispeed about how much **** the renesis rotors really suck. And the cliff notes for that answer are "lots of ****"

Renesis rotors are turds.
13b=champion
-Ben Martin

Node

iTrader: (1)

IDEA!!!!!!!!!!!!!!1
Run the stock rotors, and do methanol injection.
BDC (AKA Brian Cane) has had fantastic results w/ a top mount intercooler on a second gen and a big turbo (60-1 or 62-1 or something).
He's reduced his duty cycles from nearly maxed out to 50% by replacing the fuel w/ the methanol injection and he is running 24-25psi on pump gas.
I believe that would be able to handle the high compression along w/ some very good ignition and a very good ECU.

Good luck w/ your project

PM me if you can't find the thread and I'll try to help you finding it. It may not even be on this forum as a matter of fact haha

20bfd3s

Rotarygod, Node, thank you very much! things are much more clear now!