CJarrett

How much power can be made from a normally aspirated rotary engine? The stock one, ported, periferal ported, whatever.

Also, has anyone ever run an NA 3 rotor?


I tried searching but it didn't seem to work for me.

1987RX7guy

iTrader: (3)

250 whp a bit more probably with the new rotors that are available from the renesis.

RoToReX7

i think i have a little less than 8294765018436506345WHP

Evil Aviator

320+ HP peripheral ported, but it is nowhere near street legal, and the sound has even been known to shatter windshields of nearby racecars.

Yes, that is/was the standard for many road racing classes. The 13G was the first NA 3-rotor race engine that was produced for Mazda-sponsored race teams. It made about 475hp. The 13G was replaced by the 20B Race engine. Once again, these are not steet legal.

Some examples of both here:
http://www.teamspencer.com/cars/index.html

See here for lots of rotary engine info:
http://www.monito.com/wankel/wankel.html

1987RX7guy

iTrader: (3)

hmmm not that I read the tittle your not really limiting it to FC's if so the 26RB from the 787B le mans car had 650bhp N/a.

YakATK

4 rotor engine....mmmm.....4 rotors......man what I would do for an NA 4 rotor in my FC.....

In response to the original post. If your looking to keep the car streetable to an extent I would say no more then 230-240 at the flywheel. That would be from a big streetport with quite a few other mods as well. Go bridge or Peri and you start loseing streetability big time, mainly because an exhaust system would have to be overly restrictive for amount of exhaust flowing. Or you could just drive around with it insanely loud which is not all that recomended as the cops tend to dislike loud cars. But from a Bridge or Peri port I think 260-280 at flywheel from an NA is about right with other mods as well. Although I am not totally sure on that number.

CJarrett

Evil Aviator,
Some great vids on that first site you posted. 1 of the cars they say they own, says turbo charged, but the rest are NA? They are making great power. I mean, if I could get 300hp out of an NA 3-rotor and streetable.. that would be amazing. I'm sure a 20b is expensive though right?

Digi7ech

iTrader: (1)

A 20B by itself goes for about 4k and then it takes alot of moeny to get it into a FC.

Evil Aviator

As best as I can remember, the Lola B2K/42 originally had a 2-rotor turbo engine. What Team Spencer has done to the car lately is anybody's guess. The web site could have a typo because it lists it as having a turbo 3-rotor engine. As far as I know, the other cars are still non-turbo.

Yes, you could get 300hp out of a streetable non-turbo 3-rotor. However, the production 20B-REW comes stock with twin turbos and is rated at a conservative 280hp, so I don't see much point in going through all the work and expense to make it into a non-turbo engine just to get basically the same horsepower. You can get a good, used 20B-REW for about $4,000, but it will cost you another $6,000 to $30,000 to make it work in your car, depending on how you do it , what parts you use, what you start with, and how much work you can do yourself. The last time I checked, the non-turbo 20B Race engine sold for about $42,000 new. The 20B conversion is one of the most difficult modifications to the RX-7.

mazdized

218 RWHP with streetable exhaust and 20 mpg hiway milage.

CJarrett

What mods did you get for 218rwp?

mazdized

Holley 700 CFM carb., dual 2 1/2 inch exhaust, Jbridge port with late open intake timing, 9 lb. fly wheel, Mazda comp. pulleys, 9.7 rotors, stock ignition system, and a $3 air filter from Pep Boys. @9,300 rpm.

Ryde _Or_Die

Is that with a 6 or 4 port engine?

bill Shurvinton

Guru racing are getting 360+HP at 12,500 RPM from a bridge using their 2-part eccentric. Probably not a streetable combo, but dashed impressive.

mazdized

83 12 a side housings. I think 6 port is limited once you try to get over 180at the wheels, but correct me if I am wrong. I am planning to run the same carb. on a street port with S5 turbo side housings. 2 1/2 inch sigle exhaust. I hoping for 190-200 at the wheels. I heard some EP and IT 6 port put down some good power but I am not willing to spend big $ to squeez all there is from a 6 port, and I don't want to experiement. I know a 4 port with carb. will run good and have the result I am looking snd that is why I am not wanting to run 6 port. I think 6 port is best left stock.

Ryde _Or_Die

No I agree. I don't see a point in using a 6 port engine to try to make power for the most part.

13bgxl

Are you talking about the 13B-REW in the 3rd gens? The type RS and RZ from Japan have 280hp with 2 rotor twin turbo. I was hoping a turbo 3 rotor would kick more *** than that!?

The Unsent

so, you can add a 3rd rotor in your engine housing. About how much would that cost entirely??

Evil Aviator

I don't understand your question, so I'm going to take 2 guesses:

If you are asking if I made a typo with the 20B-REW designation, then the answer is no. The JC Cosmo 3-rotor engine is called a 20B-REW. Some people call it a 20B for short, but this is rather confusing because the 3-rotor engine that Mazda called a "20B" was a race-only non-turbo engine sold by Mazda to their sponsored racers. They now call it a "20B Race" to help reduce the confusion between it and the 20B-REW.

If you are asking if it takes a 13B-REW to make 300hp, then the answer is no. You can do it with a 13BT. For example, see the 13BT turbo kits here:
http://www.srmotorsports.com/sr86trbo.html

Please remember that the 20B-REW is the engine from a luxury car, not a sports car. Besides, many people think that Mazda low-balled the dyno numbers for political reasons. Anyway, with the right modifications a street-ported 20B-REW can make 550bhp at 15psi boost. If you slap on a large single turbo, the horsepower potential moves up to the 600-1,000hp level. Also note that the advantage of the 3-rotor is torque, not horsepower, so it will make a great deal more torque than a 13B of the same peak horsepower rating. I did not go into this earlier because this thread is about non-turbo engines.

In the US, it would cost a great deal more than what you would pay for a used 20B-REW. However, you could shop around foreign countries that have low wages (Australia, Mexico, etc.) and see what kind of deal you can get.