I'm not the greatest on rotary design, but I looked up on how to couple 2 13b rotaries together, and it is proven to work (produces ~560hp with stock internals, prior to making performance ones, on low compression with pump gas) though I am unsure of the 13b rotary length, space for the modded cooling system, the space for the second 12v battery to power the starter using 24v, or if I can mate up a Porsche 6 speed to the rotaries using an adapter plate (or a Pontiac G6 6 speed if it can handle the power). Plus if I take this on, I might want some help making my 4 rotor Fiero, if anyone is good at rotaries, or know them more or same level as I, then please lend at least words of advice. The 2 eccentric shafts will be opposed 180 degrees and connected at the center. The end weights will be removed so the eccentrics would be unbalanced, though once opposed 180 degrees, it counteracts the imbalance, but makes a weird idle. Along with only running 1 spark plug per rotor. If anyone got any ideas on how to use all 8 spark plugs, and run a 12v system to run the starter, and mate up a manual trannie, all within the back of a Fiero (that should have a tubular frame by then, when I do this im gonna do all my frame work to the fiero so it dont twist and die.) please give me a little insight!

Before you ask these questions, ill answer them:
Q:Why are you doing this to a Fiero?
A: Rotary engines produce a very very smooth power curve, and they transmit more power to the ground than piston driven engines, they lack a dead stroke, since it all happens in rotary motion. Also they have no valves, so my RPM potential, as long as the eccentric shafts are balanced just right, is unlimited.

Q: What are you building this thing for?
A: For cruising as a fun driver, street racer to beat ricers and muscle car owners, and show rotaries have more potential than what people give them. Also it is going to be made for track racing, so the body will be redone, top chopped, new wings, etc so I can adjust my ride just how I want it.

[This message has been edited by Racing_Master (edited 11-15-2007).]

I have many chicken cooker parts I would like to get rid of. Rotisserie
I have a lot of experience with them.
In my opinion a true sports car is lacking power options
The old English cars, Italian cars, even the old Jap cars have non.
First gen S models
240Z, 260Z, 280Z before they got slow and heavy
I have enjoyed my S models the best, No p/s, No Auto trans, thinner seats, No sun roof, No a/c, No rear wiper, No power locks or windows.
It is amazing what a few hundred pounds added to a car can do to a Rotary

As I recall, Mazda made a three rotor version of the engine based on the 13B, and I seem to recall hearing about 4 rotor designs. Yep... here they are.

3 rotor 20B: http://www.caranddriver.com...rs-3-rotor-rx-7.html

4 rotor 26B: http://www.mulsannescorner.com/mazdar26b.html Note that the 26B weighs almost 400 lbs.


Better yet.... go with the MYT engine. It is lighter than the 13B, but has about ten times the equivalent displacement. See: http://www.angellabsllc.com/Engine_cmparison.html

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FierOmar

Im not the richest son of a gun here, so I am trying to do the cheapest method for the power and have it rotary. I looked up the other rotaries, and the 3 rotor would not be as good as a 4 rotor, and they do not produce as much power. The R26b 4 rotor was Mazda's lemans engine, and they would not sell that at all for cheap, while I can get 2 used 13bs for 600 each from the scrapheap in decent condition, or get 2 remanned 13bs for 1500 each.

are you talking about making 1 motor out of the 2 13b's

cause that is possible, you just have to get a custom eccentric shaft, i think mazda trix sells it

The biggest problem you'll face with a rotory in a Fiero, is the exhaust ports on the engine will come out right where the driveshaft is. You'll have to be pretty creative to work out the exhaust issue.

quote Originally posted by scooz14: are you talking about making 1 motor out of the 2 13b's cause that is possible, you just have to get a custom eccentric shaft, i think mazda trix sells it

Yes I am making 1 engine out of 2. Though I am gonna try to do all the work by myself. If Mazda Trix sells a 90 degree opposed eccentric shaft I might have to look into that one, because the power would be more even than a 180 degree opposed eccentric. Though I might have to do a bit of work to the ignition system so instead of using the leading plug wire for rotor 1 and the trailing rotor 1 plug wire for rotor 3, I would have to have a custom distributor or a brand new EFI system with computer and redone harnesses and everything.

i heard somewhere that you cant to it transverse, because the exhaust is right where the tranny's half shafts go. you might be able to do it with an audi 5000 transmision, or a porsche transaxle. but that would mean lengthening your car by about 8 to 14 inches after the firewall.

thats what i have heard.

JC

quote Originally posted by Deabionni: The biggest problem you'll face with a rotory in a Fiero, is the exhaust ports on the engine will come out right where the driveshaft is. You'll have to be pretty creative to work out the exhaust issue.

I might try and run it longitudally and find a transaxle for it to be mounted this way, or if I run it transverse, then the exhaust would need a sharp bend, therefore cutting flow. I see what you mean there. I think in this case its all about finding the right transmission to mate up with it. That should be another question, possible 6 speed transmissions to mate up to it :P

EDIT: if I run it longitudally the trunk would be 100% removed, along with the GT Air pump that is in there. Giving me room for the transaxle

[This message has been edited by Racing_Master (edited 11-15-2007).]

I know that two rotor Mazda rotaries have been bolted together several times. I don't know how the crankshaft was delt with or how reliable they are.
Many V16s of old had crankshafts too long for their own good. One I remember one (Mercedes maybe?) took the power off of the crank in the middle to avoid overstressing a long V16 crankshaft.
I have long fantasized about putting two engines back to back positioned transversely with the drive coming off between them via beveled gears. This way the engines rotate in opposite direction canceling the effects of rotational inertia of each engine. The cost of such a project would be prohibitive unless one happened to work at some custom fabrication shop. Thus this shall remain little more than a fantasy.
Imagine though, two 500 cu. in. caddy engines giving you 16.4 liters. Two twin rotor Wankles would be sweet too.
The real advantage of rotary engines is their compact size, not power to weight ratios. Much of the volume occupied by reciprocating engines is taken up by the crankcase which must provide room for all those pesky connecting rods to thrash about. The RX8 engine is virtually under the dash making it a front-mid engine car.
You (plural, as in ya’ll and yous guys) may want to check out this web site:
http://www.freedom-motors.com/