toxic_d

Any thoughts on the prospect of hacking up two engines... i.e. 13B from an SE and 12A...

The thought is to use the ends from the 12A and build a 4 port 13B with REPU rotors. Then the left overs would be nice to build a 6 port 12A with electronically actuated secondaries.

Any thought yea or nay and ideas welcomed.....

Toxic_d

Blitz0309

im going to say nay

Metallic_rock

yeah on first one nay on 2nd... Why would you want a 6 port 12a?

Keaponlaffen

Ditto.

What would the gains be?

Most people want 4-Port 13B's, but you want a 6-Port 12A....

680RWHP12A

ill; go with metallic rock on this one!!
6 port 12a? YUCK!

toxic_d

Well the idea is that I wma going to go turbo on the 13B and the NA 12A with 6 port Would theoretically make more power... Mega squirt injection and all with rpm switches attached to solonoids to actuate the secondaries.

What I would end up with is a fun as hell engine without having to do the TII swap (Iknow everyone thinks that is the ideal way to go) and a 6 port 12A to play with to see how the JDM 12A 6 port may have felt.

toxic_d

Also I'm getting more yea and nay than reasons to go along with the aswers...

nosajwrx-7

I say do it if you want. A 13b 4port will be nice. A 12a 6port, aahhhh, welll, it should be a fun project, might not be worth the money invested into seals and gaskets. It will be a good learning experience. Plus, the more engines you build the better you get (in theory). I would suggest you do the 13b 4port first though, just incase you start running short on time/money/ambition.

REVHED

Go for it. You might as well put the left over parts together and make another engine while learning more in the process.

One thing though, why do you want to use REPU rotors? Earlier rotors have lowers compression than the GSL-SE ones.

QuagmireMan

what do you have to lose??


oh yea money pride dignety
just kiddin do it and let us know how it comes out in the end. Take picture

The_7

how about an engine with one 12A rotor and one 13B rotor? a custom eshaft, 12A side housings, and front parts, 12A front counterweight, 13B rear counterweight. do you think with the correct counterweights, balence would still present a problem? you would get a 2 rotor with more torque than a 12A but more rev happy than a 13B. if it worked the results probably wouldn't be TOO noticable, but it would be pretty cool.

toxic, your idea sounds like a fun project; i dont think the 6 port 12A would have any performance benefit, but it would be sweet because it probably has never been done.

toxic_d

The idea behind the REPU rotors is to reduce slightly the compression to be able to run a higher amount of boost...

Oh and the 6 port 12A has been done in Japan by Mazda...

REVHED

Ahh, you didn't mention it will be boosted.

toxic_d

Oh yeah and the 13B willl be boosted.... I'd like to get about 13-14 lbs in there.

brianw

I beleive that is a proven combo.Ican't recall exactly but i can dig up the info if you need it. The combo takes 12a & 13 b parts w/ the high compresion 12a rotors. I'm going to build one also so keep us posted!

toxic_d

yeah let me know what you have found....

fatboy7

According to RB, all 74-85 13Bs had the same compression ratio, Mazdatrix says otherwise. Unless you've already got access to the REPU rotors and rotating assembly, I'd stick with the -SE ones, because the parts are easier to find. The .2 difference in compression ratio would only affect the boost limit half a pound at 14.7psi.

toxic_d

Any thought as to whether a s4/s5 turbo intake would fit this properly?

brianw

Has anyone out there got a hold of the Reneis rotor yet, I mean come on 250hp stock! this thing is awsome I can't wait till they start sowing up in the yards.I called the dealer and there 6k+ for the block but maybe if a guy got Real lucky he could find one at a yrd or something. It sure would be the ****!