alfy28

yay for a 20b 8, then i woke up . good morning all

rotten42

rather than 3 rotors just give me a nice supercharger.

dmorales

I vote for a MazdaSpeed 4 rotor Turbo Nitorus RX-8 from the factory. With 30mpg highway and 23mpg city.
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PeteC

Holy CRAP!!!! er, ah, so when is that technology going to trickle down to the street? I'd love to drive to work in that every day.


And really, what's the technical difficulty in producing a three rotor? I'd always heard that the ecentric shaft was too complicated/expensive to mass produce effectively once you went from two to three rotors? Any truth to this? If so why not do like a lot of GP bikes and mate two smaller two rotor motors together? (Like two mini renesis motors tied together )

saturn

Werd.

JRH13NJ

that be sick, is there any motorcycles with rotors?

vOc

Give me 300+whp and I wouldn't care if it was powered by a rotor shaped twinky.

rotarygod

Suzuki and Norton both made them. I know there were a few others as well.

SlayerRX8

I want 4 rotors. They put down huge numbers, and sound AMAZING.


Here's a vid of a 4 rotor rx-7 at the drag strip. Just wow.
Click here to see Video

Raptor75

For me the best would be a factory made turbo. The rotors should be lower compression 8:1, and use a veritable vain turbo (same advantages of a twin sequential with out the complexity). You may also want to increase the width of the engines center section which separates the two rotors to allow a larger shared exhaust port. You end up with a turbo which should surpass the RX-7 3rd gen in horse power and reliability. You don't get the weight penalty of a 3 or 4 rotor and you get a factory warranty.

rotten42

That thing sounds awesome!!!

dmorales

The more rotors the more high-pitched smooth sound. My friends are amazed at how my Rx-8 sounds, and I'm all stock. I just wish it was a little louder, but the exact same sound.
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9291150

Never sold well, and been out of market a long time. Very awkward looking bikes, pricey, and ran really hot.

But what is this thread asking? If people want the 3 rotor or who would say no to more power? Everyone likes power, but I'd pass if it severely compromised the reason I like the renesis, like smoothness, high RPM's, a linear power delivery, light weight, reliability...

As for a 3 rotary renesis, it would likely provide even worse fuel economy and emissions that wouldn't pass strict emissions testing up here at plate renewal time.

SilverEIGHT

Racing Beat CatBack!

dmorales

Is there a noticeable difference. I've read many posts where people say they can barely tell a difference. And I can barley tell a difference fromt he audio clips I've heard.
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RENESIS_NEENJA

Ahh yes... the dirty things I would do...

RX26b

Smoothness? Equally, if not moreso than the 13B. As for the other issues you mentioned why would you believe any of them would be severely compromised? Reliability? Should be the same, no? All you're doing is adding another rotor thereby upping displacement 50%. And that third rotor with a bigger block would maybe add 100 pounds. I'll have to dig up an older issue of Sport Compact Car where they did a write up on Pettit's 3 rotor turbo for the FD. IIRC, the coolest thing they said about the car (other than alot more power and torque) was the fact the 20B sounded very much like a V 12.

I'll bet if there was enough demand that the engineers could make a 3 rotor turbo pass emissions. I mean, if Bugatti can have a 16 cylinder monster do it, why can't Mazda with a 2 liter?

PhotoMunkey

I remember reading a post where the poster said (Zoom44 perhaps?) that the 13B was maxed out for rotor size because the size of the ports couldn't be increased due to physical room restrictions, hence the limited N/A power.

With forced induction couldn't the rotor size (width) be increased, even if it meant that we'd have to run 4 spark plugs per rotor to help with the flame front speed? Can you imagine the increase in torque AND horsepower from a 16B or 18B with light forced induction?

Something wicked this way comes...

dmorales

Because it's a rotary...it just is...







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RX26b

Can you imagine if they shrunk the rotors down a tad, kept the 16B or 18B size you alluded to, made it a 3 rotor 1.8 liter...and turbo'd the damn thing. Freakin' 10,000 rpm redline easy, and a nice top end thanks to the one or more turbos.
I'd be willing to bet the weight penalty would be negligible comapred to the 13B.

I'm gonna dig up last year's state emissions report I had done on the FD. It passed with flying colors. The car's bone stock; but even if you were to add 50% more pollution (representing the 3rd rotor) in each category it would still pass.
Of course, today's standards are stricter, but that's something left to the engineers at R&D to solve.

People are just too content with the anemic power (relative to other high performance cars in its price range) of the Renesis, and don't seem receptive to the idea mentioned in my first paragraph. I say if you're gonna burn up a gallon of fuel every 16 to 20 miles, why not get 12 to 15 but have 400 horses at your disposal. Who's with me?

Tamas

iTrader: (1)

I think you're wrong. I remember reading about turboed cars that (unless you were pushing them) used even somewhat less fuel in normal driving than their NA counterparts. That's because they ran leaner.
However with a NA 3-rotor, you're guaranteed to burn more fuel - and will have probably worse emissions than with the 2-rotor, be it turbo or NA.

Easy_E1

iTrader: (2)

Have you not heard of a PORIPHRIAL PORT ?
This is when the side intake ports are blocked off and an intake port (65mm ID) is created directly in the rotor housing. Racing Beat did this with their Bonneville Record try. I believe it was a Third gen. RX-7 with a 900HP Periphrial Port 20B.
I had an NA 13B Periphrial Port that had a little under 300hp.
Just think Racing Beat had three turbos on their engine.
Here is a pic of the rotor housing and a pic of RB's engine.
Just think how much fuel and air you could push through a pair of 65mm intake ports. Is your brain spinning now.
Note the intake and exhaust ports in the rotor housing, no side ports.

Tamas

iTrader: (1)

It's "peripheral"

Wankel_lover

Hey man...I'm 50!

rotary crazy

no, the ports are not max out, it has been proven by a lot of tuners that the renesis can still make power up to 10,000 rpms. what will hapeng if you make the rotors bigger is a lower red line but more low down torque and more power with maybe a 8,700 rpms red line.

I think a 3 rotor engine base on a 12a renesis can be a killer engine a lot of hp and torque combine with hi rpms capability.

there are a lot of ways to make a 3 rotor as fuel eficient as a 13b as long as you dont step on it

and remember that a bigger engine moving the same weight around will always be less stress

A 3 rotor engine in stock trim is much more smooth than a 13b

imagine a 2500lbs kabura type car with a 12a based renesis 3 rotor (or should I say a 1.8 lt 3 rotor), 280hp 220 lbft of torque with a 9000 rpm red line