LookThatsMe

hey my friend is sellin his renesis motor for 1800 with 2 trannies one for spare parts... and i was wondering if it would work/fit in an 87 na... im willing to do some custom fab to make it fit...

RexRyder

iTrader: (10)

Yea it works/fits. You need A LOT of custom fab tho.

1987RX7guy

iTrader: (3)

lol



Its not going to be PRACTICAL.

For the fab work you need to do you could probably buy two FC's.

neu

lol, i dont see what the problem would be with buying 2 fc's to make one... i think i've used 3 or 4 to make 1 if i counted all the parts from different cars :P

1987RX7guy

iTrader: (3)

my point is that it will be very costly since the RX-8's engine has a lot of new technology that isn't easily adaptable to the FC. Like the TB being drive by wire. How the hell do you get that to work without the Rx-8's electronics? How do you keep the MOP system working and the controls for all the Intake variations. Its way too much bullshit to be practical. Buy a nice TII and forget about the 8's engine.

LookThatsMe

alright let me put this better i get the motor, 2 tarnnys, wiring harness, and ecu a complete swap in another works teh front clip without the body

1987RX7guy

iTrader: (3)

See you next year when you figure it out

LookThatsMe

alright i gues the renesis wont work out for me... time to look for a TII or 3rd gen

Funkspectrum

iTrader: (5)

get a TII....make more power with less $$....

Roddimus Prime

i'm new so don't take my post as fact...just asking...

the renesis is a 13B just like every subsequent rxy from 86+ (if i'm not mistaken). The engine should bolt right up in the same location with the same mounts...you may have some hood/firewall clearance issues but I don't think it'll take that much work to get the engine in. DO plan on trying to fabricate your own throttlebody adapter plate so you can reuse on older style TB. I'm not sure how much if any electronics from the RX8 you'll even need.

The rotary engine doesn't have to worry about variable valve timing or so forth...if you switch to a standalone like Haltech R6X you shouldn't need the ecu for hardly anything.

I'd love to see it done. Once more renesis engines become available I'd love to start trying different swaps with them. I can't wait to see the new renesis-powered miata.

Icemark

Ah, you have not seen one yet have you???

Mounts are different for every rotary engine made for every gen. You can't bolt in a renisis anymore than you can just bolt in a 13BREW or 13BRE into a FC. Custom mounts will be required (as well as a custom oil pan, and probably a custom FC front subframe).

gerbraldy

whats with the crazy exhaust on that renesis? why'd they make it come out the plates instead of the rotor housings???

Icemark

lower emissions, lower noise, better control over exhaust cycle venting.

gerbraldy

ahh I C. Whats the compression on those rotors too? Has anybody made more power with rx8 rotors in a n/a 13b (non renesis) then the traditional 9.7 ones?

Icemark

Close enough to be almost the same thing as the S5 non turbo... 9.7 vs 10.1

Evil Aviator

Use a Motec ECU or convert to a manual throttle body.

Once again, use a Motec ECU or convert to manual operation and/or premix.

I can't argue against that point.

gerbraldy

dam, you learn something new everyday. So there isn't really much reason to put a renesis into an FC unless you want a bunch of headaches and expensive/kinda fast car.

ddub

Nope, Renesis is actually 10:1


EDIT
Damnit Mark, you edited your post heh.

Icemark

???

gerbraldy

How much would a nice set of custom rotors cost, I'm just throwing numbers but something like 11:1. I in no way plan on doing this just the curiousity is killing me. Prob way too expensive for my blood.

ddub

Your post, when I first read it, said the renesis rotors were the same as the s5 n/a, before you changed it.

lastphaseofthis

iTrader: (8)

yea i sacond that, i read it too :P

ddub

Eh it doesn't matter, his point is still valid that they're pretty close, and there's not a huge reason to try and use the 10:1's concidering the cost and it's more difficult.

andrew lohaus

based on the geometry of the 13b, 10.0:1 is about as high as it gets. mazda has never made anything higher; and if someone did i'd imagine there woul be porblems with consistent combustion since the "bathtub" of the rotor face would be so flat.

no one has made aftermarket rotors yet to my knowledge, so sufice to say it would be VERY expensive.

Icemark

Hmm sure it was my post??? I didn't change anything... if I did there would be a last edited comment at the bottom of the post.