rotarygod

You won't get 300 hp naturally aspirated.

hondasr4kids

What you mean by this? You mean that the renesis exhaust ports are better than the older 13Bs exhaust port?

rotarygod

The Renesis exhaust manifold is just worse than the exhaust ports themselves. That's why we aren't seeing much in the way of gains from exhausts. The exhaust is fairly good compared to the actual ports in the engine.

TeamRX8

iTrader: (25)

RG, IMO you're still hung up on typical exhaust theories that aren't going to apply to this engine until you port overlap into the timing cycle. Given that, the OE design is actually not that bad or critical even. That's why you aren't seeing the usual header gains. Yet to prove it myself, but slowly working on it.

rotarygod

Once you see a Renesis exhaust port, you'll know what I mean.

T-von

Another way to test the exhaust port area differences is if we had an old 13b with the same greddy turbo with Renesis 10.0 compression rotors and compare the spool differences. This would give us a better indication when comparing the flow differences between the two engines exhaust ports since both engines displacement is exactly the same. Now I know manifold design would play a big part but the PP exhaust manifold could be engineered similar to the greddy piece.

drivelikejehu

on a two rotor no way (unless your ****** awesome) but on a 3 rotor, easy.

rotary crazy

well, the guys fron new zeland sell parts to built your own 3 rotor engine and 4 rotor engines using 13b parts, I think it can be posible but it will be harder than an old 13b and more expensive.

SomeGuy_sg

13B and Renesis rotors and side plates are not compatible. Cause of a oil ring thingy i think ..hehe..

rotary crazy

my race engine its a street port 13b with renesis rotors

drivelikejehu

yep renesis rotors are fine with 13b parts and vice versa. side plates arent compatible mainly becuase of the side exhaust, but im sure theres other reasons. i dunno has anyone ever tried that?

rotary crazy: what are the specs on your engine? did you notice anything with the rx8 rotors being scalloped?

rotary crazy

I dit not built the engine, some one in florida dit (he is a weird guy I will ask him firts if I can say his name here) there is some machining of the rotor to take 13b side seals thats all, and power its totally diferent than it use to be with series 5 NA rotors, they are sclloped difrently( going on memory) but cant tell you exatly how diferent they are, maybe RG can give you a better idea.

Im trying to get him to built me a NA 20b street port with renesis rotors for street use but he is really busy this season

rotarygod

It's easy to use Renesis rotors in a 13B. You just leave out the cutoff seal. That's it. They drop right in. You can't machine them to use the 13B side seals. The grooves are already larger than in the Renesis. The nice thing is that you can buy oversized side seals for the Renesis that will allow you to get to clearances smaller than they come in the RX-8.

drivelikejehu

you must have some serious cash flow. especially if you arent doing the work yourself. damn it must be nice...

BaronVonBigmeat

Here's a photoshop rendition of what jehu had sketched out in the other thread.

drivelikejehu

well you have to remember the intermediate plate is much thicker because it holds a stationary gear and bearing, or else it wouldnt be doing anything to spin the shaft. with it being alot thicker, the ports will be spaced out more and fit much better.

Renesis_8

http://www.mazdatrix.com/r-20.htm

Not for street use tho...
________
Glass pipe

ddub

It can be, I've seen people use them on the street and daily drive. Tuning is key, exhaust setup is also key, it can be done...

drivelikejehu

thats a RACE engine, a whooooole different ball game. when you say youve seen people drive them on the street do you mean from here to there, or to and from work everyday as a daily driver?

everything on that engine is completely custom or different in some way. you wont be able to find a replacement part from anywhere but there. and a p-ported engine typically doesnt see the streets everyday...

but theres always exceptions to the rule.

ddub

To and from work. It was this crazy dude from around my area, it was a Pineapple Racing p-port with carb tuned by Rob over at Pineapple and lots of other goodies. Also ran nitrous with it on the street.

Of course there are exceptions, always are, I was just pointing out that some people ARE crazy enough to do it

drivelikejehu

that is defiantely crazy! just curious, what was the gas mileage on that thing?! i drive 45min to work everyday, thats a hell of a lot of gas even for my stock FD.

ddub

No clue, never asked him. If you're driving a pport on the street, I don't think you're too concerned about gas mileage

rx8wannahave

I just saw pictures (finally) of what you all mean when you say porting, street port, etc etc. The Pport is pretty radical I must say so that guy is pretty nuts about his rotary, lol.

A question, why is helping the car breath better increase fuel consumption? I would think that would help things out...not just for power???

rotary crazy

so all I need to put renesis rotors in a 13b are new side seals? wich side seals?

rotary crazy

Lets just say I really love this hobbie

and people like me are the ones that are going to buy your kit if you get it finish