codaxx

Does any one know who could make me an eccentric shaft for a 4 rotor and approx. how much it would cost?
Or where could I get a 4 rotor motor i under stand there really hard to come by. Any help would be greatly appricated.

DomFD3S

You're obviously a newbie, but that's ok. Here is some info for you.

1) A 4 rotor engine is VERY rare. Pretty much the only ones in existance were either made by Mazda (probably numbering less than 10) or custom designed and put together by certain shops (Autoexe, etc.).
2) If you are going to put this engine in a car, it will most likely have to be a race car and not a street going car. The amount of torque would be very strong. (You didn't specify a NA engine or forced induced one). The amount of horsepower would also be pretty high itself.
3) The length of the engine would be very long, requiring a lot of cutting to be fit into an FD.
4) You had better have the money to get this to work. It takes a lot of fabrication as well as figuring out which ecu can run the beast.

There is more info. Just search.

black99

Just with the 4 rotor into rx7 idea in general I hope this doesn't start to become a weekly thing like the 3 rotor questions all the time.

codaxx

Ive got the money. Ready Ive been waiting quite a while. Its going into a race bred rx7 and I was planning on having it turbo. But where is autoexe? And any guesses how much just to make the motor.

codaxx

yes the 3 rotor is a little played out. But a 4 would be unreal. Ive found a chassis welder who says he can do for 2,600 thats with remaking the front crossframe and undercarriage. He ows me a favor. He says he might just convert the font to a tube frame. Mabe. By the way its a 93 FD

JoeD

4-rotors are getting played out now too.

i would suggest that you try to swap in a 5 rotor!

JoeD

newbies crack me up...

black99

Autoexe is in Japan, I've personally never heard they were building a 4 rotor but we in the U.S. don't exactly get all the news from japan. But maybe Domfd3s heard something about it. Also Scoot Sports(Japan) is building a 4 rotor car at the moment. If you hit the 20B section of this forum you'll find some news on 4 rotors. Scoot's plans are to use 4 12A housings I think. I would suggest you'll probably have to have the eccentric shaft made in NZ or Australia by one of the insane rotary guys down there. Or you may try contacting www.pineappleracing.com as they might know a little about where to get parts to build a 4 rotor.


Here's a link to the 20B forum:

https://www.rx7club.com/forum/forumd...?s=&forumid=95


Are you going to do the work yourself? If not estimates in the 100k+ range to get someone to tackle this prodject. As everything would have to be custom, and you'll need a huge turbo for forced induction.

DomFD3S

Well, IF you do have the money...more power to you.

My estimation of what this project may cost you is close to 6 figures. If it is going to be a race bred RX-7, you might as well go w/ a full tube chassis. The stock chassis (in my opinion) will probably not be able to handle all the power (since you are going to be racing the car). You will need to get it welded/reinforced so you might as well go w/ a full tube chassis. That in itself is going to cost quite a bit. Then you'll have to fabricate the body/shell. And that is just a small part of what it takes. After that, you will need to fgure out which turbo or turbos would be right. Fuel supply will be addressed. Some sort of ecu to make it run, etc.

I think my estimate of close to 6 figures is about right.

Autoexe is a tuning shop found in Japan. To create a 4 rotor? It is custom so it would be hard to say. You may want to contact Pineapple Racing as well. See if they can help you out since they are in the US.

gfelber

Call Jim Downing. He, Mazda, and Autoexe have the only "official" 4 rotors in existence (using factory spec e-shafts). Last year he quoted a figure of approximately $100K for the engine and stated that, at that time, there were only 4 functioning 4-rotor engines.

As far as a race car goes- it would be cool, but probably a bad idea in the long run. The 4 rotor is very low on torque and fairly heavy (400 pounds, not including intake, exhaust, or accessories). It was/is (currently at LeMans) typically rendered uncompetitive due to imposed restrictions. In fact, it only qualified something like 17th the year it won LeMans. That's right, 16 cars dropped out ahead of it.

As far as power, Jim quoted something like ~700 HP NA and ~420 torque, unrestricted. With the variable length intake trumpets, torque jumps up to 450 lb/ft.

For $100K you could build a much better boinger with loads of torque.

Good luck,

Gene
www.purplemantis.com

DomFD3S

Damn black99, you pretty much said exactly what I posted...hahahaaa.

codaxx: even black99 estimates a figure of about 6 figures. For that price, you're not too far off from buying a Porsche 996 Turbo ($125,000) or a R34 Skyline from Motorex for that matter ($90,000).

black99

Yeah DomFD3S I am a mad typing fool. hahaha I probably shouldn't have said 100k+, you could probably do it for a little under that. But I don't think you want to get into this if you have a budget say less than 80-90k.

I know a little about going 3 rotor and the costs as I've thought about it before. And I've read a little of the 4 rotor threads and judging buy what it costs for a 3 rotor including the car, it's going to cost you alot to go 4 rotor. Especially with making a turbo manifold, finding a turbo big enough not to strangle the ports, and your tube chassis, exhaust system , EMS, etc. The fuel system would be a major work of art in itself to flow that much power. You realize that 3 rotor PP turbo drag motor can make 1500hp, think about what a 4 rotor motor PP'd would do.

Then you have to find someone who can tune the car when it's all said and done and hope you have a good tuner in the U.S. that doesn't detonate it. You have to really love rotarys and be really committed to this prodject to spend that kind of $$ on it. Granted the car would be a monster when done.

mmaragos

Pineapple will take a (your) 13B-REW, scavenge parts and make a 4 rotor. Site listed above.

Yashiro Engineering builds a custom R26B. Their website has been down. I have a contact at work, if you want it. The engine is about $45K.

http://www.hurley-engineering.ltd.uk/ can make you a six rotor.

http://www.gurumotorsports.com might be able to help you get a custom e-shaft.

black99

Damn, mmargos has the hookups... lol

codaxx

Yeah but to make a 3 rotor with 1500 your talking aboult a rebuilding it every race. And this wont only be a dragger. I was planning o traeating the 4 rotor as 2 2 rotors not sure if this is possiable a few few peole have said that would be the easy way to go. May sound stupid somebody got to try it. How much power in that R26B motor

black99

I don't know if that motor 1500hp 3 rotor was rebuilt after every race or not. I was only told by Greg that someone in philly has that. I personally see no reason to spend the $$ on a 4 rotor if you aren't going to max it to it's potential. How much HP do you want?

codaxx

Im shooting 1000+ with race fuel and 22 psi. The 4 rotor produces insane amount of torque too. This would be more for just to say I can than anyother real reason. I would race it except i am a shitty track driver. Not a bad dragger. The oter major advantage 1000 Hp out of a four has the same reqalability as 500 out of a 2. So i wouldnt be rebiling it all the time> i could jump it to 1400+ for races. Its all hypothtical at this point. But looks very realitic. I am a fully certified TIG welder so the mounting i can do my self that is where a lot of money goes. It all cost on how much the shaft is. Then ill order it and work form there.

Blitz0309

supposivly you can get pinapple racing to make you a 4 rotor, you can allways shoot them a message about it. www.pineappleracing.com

black99

codaxx, in theory your idea sounds like a good one. I guess you'll want just a large street port or would you go bridge port? Any idea what turbo you would use? It would have to be huge. Also the aussie guys hang out in the single turbo forum they know alot about turbo sizing and can tell you if they've ever seen a 4 rotor and might be able to give you some reccomendations.

codaxx

Just talked to pinapple.They said they have a kit that basically bolts 2 13Bs together. I Was plaing on running 2 KKK stage 2 kits on it. He had a pretty reasonalbe price that could fin in my buget quite well. Sorry guys dont want anybody to copy it and do it before me. But here what im figuring with 2 fresh motors his shaft and kit mounting it relaoction FMIC and radiator. And me mounting it my self.25k+

Chronos

I've always recognized that one of the Rx-7's strongest points is it's 50/50 weight distribution due to the engine positioning of the 13B. Naturally if you get a 4 rotor monster engine in there it would destroy the ratio...but if you're getting a whole new body for the car, i guess you can address that issue.

Basically, if your goal is to maximize the amount of power you can get from rotory than I don't really see a reason to keep the Rx7 body...maybe go with a Supra or something that has more room in the engine bay?

CYM TKT

iTrader: (4)

maybe you need this turbo hehe.



they use it on a mustang dragger. Its the Turbonetics T-105 which is capable of supporting 2000+ HP

CYM TKT

iTrader: (4)

here it is installed:

codaxx

Yeah but I already own an FD. whats that turbo cost 20G's. Also with that much power i can afford to add some wight in the back to re balance it. One other suggestion was move both engine and transmission back remake interior to stay close to the 50/50 wegith. Im not building a new body. just mabe some new front pieces. Also supras suck Rx7's are way cooler.

RyanREX

If you read the new Car And Driver find the article about the 4 rotor corvette concept. I wonder where we could get one....