vipernicus42

iTrader: (4)

Sorrow,

I don't s'pose that "23a" is ported is it? with all the power it makes, you wouldn't *have* to, but if you mildly street ported it...

Or hell, even J BRIDGE ported it, you could stick it in one hell of a drag car!!

Jon

RotorMotorDriver

iTrader: (1)

Why is there no space for a CAS or a dizzy on that thing?

~T.J.

12abridgeport

I've seen some 3,4 rotor setups on the internet using 13b and 12a but would anyone have some actual information on them. How it drives, torque, hp?

Also it would probably going to be a real pain to tune one of those motors the right way, at least the 3 rotor. It is a lot more challanging than a standard 2 rotor.

Jeff20B

iTrader: (13)

RMD, it's got an FD front cover.

Hey peejay, you forgot to mention that the stationary gears would need to be changed going from 13B to 12A rotors. There's a 5mm difference. 12A to 13B, they'll be short. But if starting from a 13B, you'll need the 12A gears, otherwise the rotor bearings will get chewed up if not aligned properly during assembly, or it just won't go together at all (it'll sit up 5mm and you'll get out the BFH and...).

RotorMotorDriver

iTrader: (1)

Ok...FD front cover...I thought they used CAS also?

~T.J.

Jeff20B

iTrader: (13)

Nope, they used a trigger wheel, like in the pic. I guess it allowed the FD to have even more accurate timing than a CAS.

V8kilr

I always thought it stood for "a" = carb "b"= FI, guess i was wrong,

ah well now i know, and knowing is half the batlle,

"/\ dont pay any attention to the drunk "

RotorMotorDriver

iTrader: (1)

Ahh...So thats what that goofy thing is...A trigger wheel.

Im so glad I have this place to teach me everything I need to know .

~T.J.

rotary emotions

You guys seem to forget about the racing engines Mazda build. It is true that the 10,12 and 13 stand for capacity, but some 13B-based three and four rotors were not called 20B or 26B like the production 20B or later R26B racing engine. There was also the 13J and 13G. These were 3 and 4 rotor versions of the 13B engine, but were stil called "13" by Mazda.
Also, someone mentioned the R130, and was impressed by a FWD rotary car. Well, again, this isn't at all strange.
The 1967 NSU RO80 was FWD, so was the Citroen GS Birotor. The NSU was FWD using a in line gearbox and engine, the Citroen had the engine mounted transverse.

Amagi82

Me too... are you sure it isnt A= carb, B= Fuel injection??

Pedestrian X

im sure there is alot more to it then that

Maguire

iTrader: (1)

If that was true. then the 4-port 13b wouldnt be a 13b.

Any speculations on what the "J" and "G" stand for?

Jeff20B

iTrader: (13)

I guess it is true, because the RX-4, REPU, and Cosmo had 4 port 13Bs stock.

So who here is going to transverse mount a Mazda rotary into a front wheel drive car?

Maguire

iTrader: (1)

why would anyone want to do that?

Amagi82

That would suck, but it WOULD be nice to transverse mount a Mazda rotary into a mid engined car! Imagine, 1st gen MR2 with 500hp turbo 13b With the car reduced to 2200lbs, it would be a rediculous display of horsepower

REVHED

I've seen it done in a mag... 13B pp in an older front wheel drive 323. His brother also had a 20B pp in the same kind of car coverted to rwd. Kiwi's are crazy.

PeteyTurbo

FYI,Dave @ KD Rotary has built a 3 rotor engine with 12a housings and rotors..Call it what you will..He has the Ec. shaft custum made and it was put in a car and set up for N/A with a street port I believe..If I'm not mistaken, it made 300 or so at the wheels..

Jeff20B

iTrader: (13)

I've seen some low res picks of that 323 at badrotor.com. I might have access to my aunt's FWD 323 some day. Maybe I could...

V8kilr

wouldnt a 3 rotor 12a slap right in a 1st gen with no mods excpet to the rad for clearance?

rotary emotions

To install a custom built 12A based three rotor into a 12A chassis you'll need a seriously modified engine bracket, or need to modify the crossmember (better idea). Other then that, it'd be rather straightforward, as there's space enough under the hood of a 1st gen. But just imagine all the work to get an exhaust made up, an intake system done, ignition setup...
That said, you can get a 3 rotor 12A done by Hurley.
visit them here: www.hurleyrotary.com/
RX-777 Specification
• Triple rotor engine
• Triple 1 3/4" HIF SU carburettor
• Special HME inlet manifolds
• Exhaust manifold and free flow exhaust system
• Heavy duty clutch assembly and bearing
• Triple rotor distributor
• Rev-counter conversion
• Drive in / Drive out

Price from £4500


The RX-777 conversion gives 160 mph performance combined with an economical 24 MPG at 70/80 mph motorway cruising.

Jeff20B

iTrader: (13)

I wonder how much they'd charge for a shortblock? Maybe I'll take the the triple carb setup too.

BRealistic

When you mention E'shaft, that means the crankshaft, right? And I doubt the 250hp AND 24mpg at 80mph claim on that engine. A stock 13b wouldn't get 24mpg, let alone a three rotor making 250hp.

Maguire

iTrader: (1)

i with draw my statement about the fwd rotary setup. Because a rotary Austin Mini would be insane. That is the only car i think think of that would make it worth the effort.

that price is in euro's right? That's $5200 US dollars. Sounds like a deal to me. and less of a hassel than a 20B

rotary emotions

Maguire, that price is British Pounds, not Euro's.
BRealistic: it's called an Ecentric shaft, not a cranckshaft. Crackshafts are for piston engine's. If you look at both the cranckshaft and the excentric shaft, you see they hardly look alike. Hurley is a serious firm, so I have no reason to doubt their figures. Obviously that MPG will be under ideal conditions, but still.

BRealistic

You say tomahto, I say Ketchup.