Fickert

iTrader: (6)

So I have been heavily researching to do a hybrid Renesis Hybrid build instead of my REW. Mainly for he uniqueness of he build and I have a pristine renesis motor I can use for the build, while I don't have a complete REW block yet. On top of it all, I should be able to sell the REW parts and damn near break even with everything I need to start building the Hybrid motor.

Anyways, I am trying to get some stuff answered before I start selling off my REW parts to fund the remaining housings and rebuild kit.
- Will utilize GSL-SE rx7 housings since there is no machining involved. And Mazda is manufacturing brand new ones for much less than even good condition used REW housings.
- Likely will machine the rx8 rotors to accept REW deeper apex seals. Thoughts?
- Use mostly OEM Mazda rebuild kit, swap out for HD water jacket seals and Goopy Apex Seals
- Greddy or Nicon Rotary Oil Pan (will the Nicon Rotary REW oil pan work?)
- Custom Manifold with BW SXE363
- Large Street Port or Half Bridge.
- Oil return to front cover
- V mount intercooler and custom piping
- Using Adaptronic management
- ACT 6 puck clutch
- LS Coil Kit (Will upgrade IGN-1A Coils)
- DW400 brushless fuel pump with return
- Other stuff I am sure I am missing. Most of the REW swap components are getting swapped over.

I have a lot of the swap components already aside from the rebuild components, Intercooler/piping, manifold, and rx7 Housings.

Some of the bigger questions I have that I have no been able to really find:
- The GSL SE rx7 housings are being manufactured new from Mazda. This raises the question, are they using the same coating as the REW or would you think they are using the standard coating that was originally applied on them? I emailed Atkins to see if I could get an answer but I haven't gotten a reply from them.
- Machining deeper apex seal grooves for REW seals? Is boosted Renny seals really an issue? I heard people complaining they can fall out.
- Questions regarding corner seals. Do people prefer OEM or solid corner seals?
- Any other input if anyone has info on hybrid builds. I am digging around and its amazing to me how little info there is. It might be worth while to do a couple videos from the build and what I learn. Not much of a social media guy though.

TeamRX8

iTrader: (25)

if you intend to build a Renesis engine with RX7 rotor housings you’ll be wasting your money, but then it’s your money to waste if you want

Fickert

iTrader: (6)

Team I was waiting for your reply. With only as much energy as you want to apply, please list reasons why.

TeamRX8

iTrader: (25)

well ok, just remember you asked

less reliability
same power maybe, likely not
costs a lot more
way more hassle and aggravation
no overall benefit

but go ahead and be *special*, except not really because others already made the mistake of beating you to the punch. Kyle Mohan was probably the only one to get anything close to a positive result and I shudder to think how much resources he poured down the drain on it. I’m kind of thinking you’re not in the same boat or at least from the perspective of having your own shop and level of experience, but maybe you won the lotto or are a multimillionaire with cash to burn. There are others including on here, no real results to back up their talk or $$$ up because they were either less than honest or were too embarrassed to post them. They all have different engines now, but in case that isn’t enough ...


I even thought it was a great idea a long time ago, because I failed to think it through back then too.

adding BP to Renesis plates = double fail

but the perhaps the best reason is you haven’t done your homework and don’t really have a good grasp on what you’re proposing. It’s just a hodge podge of bad ideas off teh intrawebz and dreaming about them being something special when in the awake world they’re not.

my recommendation is to delete post #1 and go back to an REW build. Even a Renesis engine with modified RX7 rotors from Petitt would make more sense. Or just a Renesis, it’s that bad of an idea.

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sinkas

there a re a few of thees running in Australia, but none of them seem to have been very successful,
and one shop that builds them seem to do a very bad job at it,
I keep hoping @brettus will do one

TeamRX8

iTrader: (25)

it won’t matter who builds it. Many years ago some people thought they were doing this in Japan and making high output, but they were mistaken and it was just a full NA 13B conversion instead.

Brettus

iTrader: (2)

Haha ..... There's no way I'll be doing a hybrid like the one proposed here. I think the big thing that those doing these lose sight of is the reason why the Renesis works so well as an N/A engine. That being the sophisticated intake system that maximises air velocity to achieve great volumetric efficiency across most of the rev range. Adding a PP intake for example destroys all that good work.
As far as the exhaust goes ... adding a PP exhaust whilst retaining the side ports does increase the power potential for a turbo Renesis but at the same time it destroys any chance of decent response. So you are still left with an inferior engine to an REW not only in that respect but in other ways as well.
I still have ideas of building on my mini PP exhaust N/A engine experience and applying that to a turbo PP exhaust Renesis. The concept would use similar ports to what I've already tried with the aim of making a responsive 500whp whilst retaining Renesis drive-ability.

UnknownJinX

Mazda has a patent that showcases a peripheral and side exhaust port rotary, but that's turbocharged and the peripheral ports are quite small compared to the 13B ones.

Just with my limited understanding, the increased exhaust flow area is great for high end but bad for low end and turbo response because it hurts flow velocity. It could work if there is some kind of valve that shuts off some of the ports at low RPM and open them up at high RPM but that's complex and rotary's high exhaust temperature will challenge the durability of such system.

TeamRX8

iTrader: (25)

Brettus

iTrader: (2)

Similar to this ?

UnknownJinX

Oh yeah, I remember you showcasing this a while ago.

How is it working out?

Brettus

iTrader: (2)

It works great, although I'm not getting anymore power than a fully built stock engine.
I've raced a few 8s now and I get a few car lengths on most of them so it's definitely at the upper end of what's possible for a Renesis but it's not the leap forward I was hoping for.

Kimura

If you really want to copy the design use something like a gsl-se center plate that doesn't have the exhaust port?

TeamRX8

iTrader: (25)

yes, I looked into it just to eliminate the Siamese exhaust port on a Renesis. The injector angle is different which requires a modified fuel rail and in this particular case you still have the outer side exhaust ports, Renesis rotors, and so on. I didn’t get as far as how the port profile lines up with the Renesis LIM. I wouldn’t bother with it any more than the contraption above. These ideas are not well thought through imo. There’s no point even having a wastegate on there, but that’s a different subject in a different thread. It’d be better to keep them separated to avoid cross-talk confusion. The place to discuss this other bad idea is here:

https://www.rx8club.com/series-i-maj...roject-270529/

Does pulling away from other cars of undetermined power level and other relative factors prove it pulls better at high rpm or does it prove than an otherwise stronger engine is suffering more at low rpm than high rpm or any number of alternative scenarios? It’s just like I stated previously above. When you aren’t providing any verifiable reference point you can paint it any color you want.

Brettus

iTrader: (2)

I'd just point out that the valve arrangement in the pic is equally as successful as the manifold it's mounted on, which is actually your own design. As such that's one of the few "contraptions" you have had the guts to create. Much easier for you to sit on the sideline and belittle all others that would dare try anything new.

TeamRX8

iTrader: (25)

edit: I don’t have anything against you Brettus and am sorry you feel that way, but you misinterpret multiple things on multiple levels. I still hope it does prove to work for you and look forward to the results if that day comes.


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