I'm wanting to start my new motor. I have heard alot about putting four rotors together I think it's called a 23a. I want to know if I sould use a piar of 12a or 13b blocks. Any input would help.

 

Holy crap, that's a big job. Your biggest two problems would be 1.) hmm, this engine's way too long for my car .... and 2.) the eccentric shaft. Manufacturing a two or three-piece shaft is what gave mazda such a hard time with the 20B as well as everyone else who's tried to make one. If you find a good way to do it, I'd love to hear it run.

 

Mazda had a 4 rotor 26B racing engine. It was a peripheral port that developed tons of power. Good luck in getting one of these. The easiest thing to do would be to have someone custom build the parts. There are some people in the world that can make one. Jeff Bruce in New Zealand makes custom 3 and 4 rotor engines as well as Scoot in Japan. The Scoot 4 rotor is based off of the 12A. You can't just use a pair of engines. You'll need some custom housings and a custom e-shaft, oil pan, computer, engine mounts, etc. You'd have to relocate the radiator farther forward as well as too many other things to list. Your easiest option would be forced induction or just stick with a simple port job for a little more pep. If you just have thousands of dollars to spend though then go ahead. It is a much bigger project than you realize.

 

I read about a dirt track guy that I believe used a 4 rotor. He said the car made tons of power but if anything broke then he had to custom make the part to fix it. He eventually gave up on it.

 

why would you need custrom housings or a computer?

 

You wouldn't need the computer if you were going to stay with a carb. You will need to custom build the intake and exhaust manifolds though. For the housings you can't just use the end housings bolted together so you would need something like the 20B front/center plate or have a standard plate custom machined to accept a stationary gear for a 3rd rotor. Each case would require a new e-shaft. The custom 4 rotor at Granny's Speed Shop was in fact built using 2 engines bolted together but it wasn't quite this easy. The eccentric shafts had to be machined and a special coupling made to join them. Their project didn't look easy either and it was much longer than a standard 4 rotor would be due to the increased length between the engines.

 

Here you go!

http://members.tripod.com/~grannys/4rotor.html

 

custom e-shaft - the guy in kiwiland the made hitmans 3 rotor can make one
you might be able to get 2 ida+manifold to work
custom header
tension bolts
make a mount

could be done
8k maybe.....
but it would be pretty ghetto

 

did that chef guy on here complete a project like that?

 

i think as much as i hate to say it, go with a v8 unless someone comes up with mass production of a kit with the parts to do it, but thats doubtful

 

I'll have to find it but I think there is a kit out there for three.

 

you could do it with 2 12A's and an extra intermediate plate. Headers would have to be bought and welded together, two IDA manifolds could be used. Now, come up with a four rotor E-shaft.

 

Quagmire, turn from thy ways. You're falling away from the truth, and I fear for your soul.

 

Building a four rotor isn't a matter of "being possible" but a matter of "can I afford it". And well, I know I can't... Just imagine the cost of the custom intermediate housing, and E-shaft. Then the work on intake and exhaust manifolds. And the cost of two carbs, and the problems getting them synchronised...
If you're able to spend a lot of money, a 20B might be a smarter move. You'll "only" need a custom engine mount and exhaust, and a ECU to get the thing running. 350-400hp easy, and way more if you go single turbo.
I hardly think a 4 rotor 12A based engine would be making more and it wouldn't cost less either...
Now, don't see this as a statement that a 20B swap is cheap...

 

If I were ever going to do a 4 rotor, or even a 3 rotor, I would put it in my Dodge Dakota 4x4.

Now that would be cool, and teach DC a lesson for not releasing the 5.7 Hemi in the Gen III Dakota. There is plenty of room and the lower CG/less overall weight would be awesome. Show up at Daktoberfest, embarass several people and then, after the fact, show they were put to shame by a rotary.

...just day-dreaming...

--Brian TC

 

He was gonna, but ended up scraping the idea.