guitarjunkie28

it's for an fc, but oh well. thought you guys might get a kick out of it.
and this thing has to be ready for mazfest dave will no longer sleep.

army_rx8

how come one of the housings says 13b on it while the other 2 say 20b?

guitarjunkie28

because the motor went boom. that's why my buddy got it so cheap. fear not though, the rotor housings are compatible.

Moostafa29

I'll take it if you're feeling generous :D . Where do you live btw G.J.?

guitarjunkie28

so.cal

he's $12k into parts for this so far.

FONZIE

darnit I'm confused. Is the 20b the renesis?

Who makes the eccentric shafts for these beasts?

guitarjunkie28

na, that's a cosmo motor. it's going in my friend's 91 rx7.
i just posted it up here for the hell of it.

JeRKy 8 Owner

Whats it get like 10mpg (highway miles)?

guitarjunkie28

na, it should get high teens/low 20's on the freeway.
there's a bit of extra weight to deal with, but there won't be much load on the engine at cruise, so we'll crank up the timing and lean it out in those spots.

of course when he steps on the gas......well, you KNOW what's gonna happen then (at $2.85 a gallon). i think i may end up tuning it on 87 for low boost, but we'll see what happens with it.

IZoomZoomI

haha low 20 mpg, even with an extra rotor it gets better mileage :D

guitarjunkie28

AND, unfortunately, i've been asked to make this pass the sniffer, so it'll have the air control valve hooked up and fully functional.

it's still not smog legal, but at least it'll pass the sniffer.

ZoomZoomH

iTrader: (1)

i want to hump that intake port... is that wrong???

Ajax

is that thing purple? or is that just black in odd lighting?

rotarygod

Is that thing painted purple?

Ajax

haha! i beat you to it!

guitarjunkie28

it's color-changing paint :D

let's see how well it holds up to the engine heat. hey, at least it looks sexy just sitting there.

guitarjunkie28

here's some good color shots.

tuj

Mazda does. :-) The 20b was used in the Cosmo in Japan. The numbers of these engines are quite limited. The rotors and housings are the same as the 13b, but the center-housings are different. No its not a Renesis because amongst other reasons, the exhaust is perhipheral, not side.

Ajax

It's pearl purple! i love that color. It's one of my favorites!

My first 6 RC Car bodies all used a combination of that paint.

Ajax

But mazda is currently making a 20b renesis engine for racing. It was announced a few weeks ago.

rotarygod

No they aren't. It has just been referred to as a Renesis purely from a reference standpoint only. The new race engine dubbed R20B is actually based off of the old 13G 3 rotors which preceded the 20B. There still wasn't much difference between the 20B race engine and the 13G. The new R20B is an all peripheral port engine. No side ports anywhere.

guitarjunkie28

feel free to do so at your convenience. i'll leave some brakecleen out for cleanup :p

tuj, the rotor housings are different castings completely...but they are compatible. other than swapping the sleeves in the 20b housings, the only real mod i had to make to the rear rotor housing was drill 2 of the bolt holes a little larger for the 2 big tension bolts--piece of cake.

Ajax

I stand corrected.

So it's all naming eh?

Well that's gay. I really wanted to see how they ran those side ports on the center rotors too..

tuj

Hmm, I didn't know that. I knew that one of the center plates was different, but other than that I thought it was all interchangeable/identical. Why didn't they use 13b casting's on the housings? Seems like that would have made more sense.

That aside, I would still love to see a real 3 rotor Renesis. I would think it could get more hp than the 20b (given the Renesis makes more than a NA 13b) in street form, altho less than a 13g, but the 3 rotor Renesis would idle and pass emissions. I am holding out hopes that a new rx-7 will have a this engine.

guitarjunkie28

i'll get some pics for you in the next few days if i can. the sleeves in the 20b are really restrictive, but they offer a lot of noise reduction (it came out of a luxury car). i've got another cosmo 13b with the sleeves intact that i can take pics of.