i figure its got a good power to wieght ratio,its relativy simple.

the only hard part would be motor mounts and attaching it to the trans.

they are also cheap,especialy if i went with a carb.

for me it would be double the power with half the engine weight.


i was thinking something like the 20A , it should be plenty of power ,or at least as much as i would ever need.



what do you think?

 

do a I think there is a good one out there on it. w/pro & cons on it.

y'know you're gonna get get the flames,so put on those asbestos undies.

 

i dont care about flames. thats why they make coldfire.

 

Hey!? Its Wellington with another crazy idea! WhoDaThunkIt?!

Lol, Ive never seen it done, but if you could get somewhere with it id be the first one to congratulate you.

Of course i am more of the kinda guy to shoehorn a SBC into an rx7, not the other way around.

The thing with the rotary is theyr not too reliable, have no torque, and are pretty damn heavy for the amount of displacement...

FYI if you can get ahold of that (3 rotor) cosmo motor is its not cheap... so if your going to go cheap this isnt the way to do it.

Gas mileage isnt very good either...

 

Just to clarify im not flaming, id love to see it done, but you keep coming up with crazy ideas and not doing anything!

Build something mild blowing already!

 

thats why he wants a 30 gallon tank lol

 

but if i had the cash for a REAL rotary.....


http://www.rotamax.net/index.html

put a twin turbo set up on the big one,it should have 250 hp and weigh 200 pounds, and it should still get 35mpg city,at least!!!


but for the price and the power and the gas milage, the duke is plenty for me.

but if i had the money.......

 

Torque would be a huge issue. I drove an early rx7 with a 13b, and even the owner was disappointed with the lack of low end torque. Its just the nature of the beast with a rotary. Now throw in the fact that you have a heavier car, and it would suck imho. He also blew 3 motors (apex seals) in the course of a summer Finally called it quits

 

yeah,rotarys have some down sides.

i think ill just build a 2.5 into a 3.0 stroker.

 

very interesting idea definitly. yes the torque is an issue, stock. if it was to be done a turboed one would be the way to go you, i think these things are capable of like 5-600hp+. at that point i dont think torque would be much of a issue, youd have enough, plus theres the fact the they rev insanly high.

sbc into a rx7 you say been done, there was a guy putting an ls1 into a 3g rx7 a while back, im sure hes done now, it seened like a real pain but he had the money.

as for the 3 rotor cosmo motor, good power but there notorious for leaking oil, even new ones i believe.

as least it would be different.

personally if i were going to swap in a japenese motor into a camaro to be different my sugestions wuold be 1. sr20dett, nissan skyline over 300hp twin turbo. 2. twin turbo 300zx motor, 300hp. 3. toyota supra motor twin. 4. either the mitsu or wrx turbo 4. the wrx flat 4 might be interesting since i know they can ba built to put out 500+. all in all i think ill stick with v8s though, easier to put in and work on and parts area a hell of alot cheaper.

 

they aren't that unreliable
I know of many with 200k+ miles (like my own) and a few that have pushed 300+k miles


most of the problems deal with stuff other then the engine making the motor unreliable


and iwth the 20b
your right IF he could find one it isn't going to be cheap at all

and the motor isn't that heavy
can lift the whole thing up by hand with everything attached other then the intake/exhuast manifold.
wasn't too heavy

ang gas mileage was around 22mpg avg or so with around 50/50 hwy/city mileage

have hit a peak of around 30mpg on the freeway before though that doesn't happen often. most hwy mileage is around 25mpg or so

 

mpg at least??
wanna share what your smoking?
only way your going to achieve those numbers is with an act of g0d. not using a carb but instead using EFI and leaving out the fuel delivery to the point of just about not running

also I don't see how this is much different then a normal rotary so why are you calling it a REAL rotary?

 

Man just admit it, this motor would be no good in a heavy third gen. Most aren't convinced that they were the best for even the rx7. Everyone has there own opinions but thats mine. Add to the problem the lack of knowledge about them, and the fact that they WERE unreliable, finicky motors and it is a bad choice.

 

have a 13b out of a 85 Rx-7 GSLSE with 5-sp trans if yout interested complete with 2 extra boxes of rotary parts let me know thanks george

 

it won't be a good choice in the thirdgen I admit that

still don't see the unreliable part though.
unless you want to talk about how people don't understand them and break them? or how the parts attached to the motor aren't always the greatest
let me ask you this. what do you think would happen if we took the radiator out of your car and instead replaced it with one that would work for a geo metro motor but nothing more? when the motor breaks due to overheating is it your motor that's unreliable or the fact that the cooling system sucked?

 

So your telling me that all these people have problems with their wankels because there putting too small of a rad on? Or that they came from the factory with crappy components? I'm not being a dick, I just don't understand what your saying?

 

make it a 3.0 stroker w/ twin turbos, you should still be in the 20's in gas mileage and be really quick, but im a rumble grumble sound fan instead of the pissed off coffey can sound, but it would be pretty cool to see it done!

 

not all the problems are external component related but there are some issues with the rotary that aren't motor related exactly.

they can be fairly durable and handle a good amount of power. one of their weak points is they don't handle misstuning well. but that doesn't mean the motor is junk. it just means you can't tune.

a few problems with some rx7's
fuel injectors/fuel pump close to being maxed out already on the Turbo cars.
radiator way too small for the car gets too hot things go bad.
the way the rotary handles too much boost? it cuts fuel to one rotor, the rear. next thing you know the car doesn't like it runs lean and detonates so goes boom.
the stock ECU can't handle tuning changes very well. part of it being it doesn't know how much air really goes into the motor when using more then stock boost or even worse when using an aftermarket turbo. it's not like you guys where you reprogram the chip. it's either aftermarket ECU which is best or a piggy back but those still don't give relaible performance. With doing that though your still not addressing the timing issue.
stuff like this. and this is how it came from the factory. mazda played cheap with a lot of the components that get attached to and run the car. and the little jap men couldn't solder worth a damn either.
plus one thing I don't like and this is directly motor related. it is weak when it comes to mistakes. if you can tune it right it should be reliable. one thing though the motor doesn't handle tuning mistakes very well. on that part it is unforgiving and weak. piston motors at least when making a mistake generally tend to be more forgiving.
but still in a way that still doesn't mean the motor is weak. it means that you couldn't tune it right. though still would be nice if it was more forgiving to those mistakes while someone learns how to tune

 

I see what your saying, I call that finicky. A lot of your points would explain why once you blow the motor, and try to replace it the replacements tend to not last long at all. I still think it would be awesome to put a sbc in one.

 

I would say a SBC in a firstgen rx7 would be nice
car stock weighs around 2200-2400lbs or soand is already setup for RWD which makes it nice.

the N/A rotary isn't that bad. most all my problems have been other stuff going out. driveshaft a few times, a tranny and a pulsation damper stuffl ike that. the motor itself is still going strong last time I was able to drive it.
N/A doesn't really have all the finicky stuff and isn't so sensative. most tend to last 200k miles or so. but as always there are exeptions. if he put on in his car though the rotary prolly wouldn't be much different then his duke just with worse gas mileage. so turbo would be the only real way to go. unless he knew what he was doing all he is doing is putting a time bomb in his car as many don't know how to tune a rotary with boost right. (I'll be honest I don't very well )

 

They actually sell a lot of stuff for the conversion, mounts, crossmembers and stuff. Maybe if I come into a lot of money I'll tryi t It'd be funny to see people lookign around for the muscle car, and an rx-7 pulls up beside them

 

An ls1 in a rx7 will still land you with that often sought after magical 50/50 weight dist. And probably weigh exactly the same as a turbo car.

Also the trans tunnel is huge. From what ive heard a sbc can be shoehorned right in.



Ive still got an old L98 laying in my backyard that just might make its way into one of those things... i think a turbo is in its future.

 

you would still have the cut the firewall up a bit if you want the motor near where the stocker sits.
the weight with an LS1 is still off from 50/50 by a small amount unless you start removing some more stuff from the front or add some weight to the back. still fairly close though.
if anything though I would prefer a little rear weight bias.

 

.........what about a diesel elctric from a locomotive?....... you're fired!