I've read the faqs and they're not 100% clear on which series of the RX-7 had a carbed 13B.
From what I've read the 2nd generation and up all came with EFI.

I'm looking for a 6-port, 13B that has a carburettor and knowing the series, dates, models, etc. would help when I ask the local importers for an engine.

Thanks

 

Pretty much all the 13b's came FI except the pre 78 13b's.

 

I found this on Wikipedia :
North America was the only market to have offered the first generation RX-7 with the fuel injected 13B.

That's good news for me - it means that there should be plenty of 1st gen 13Bs with carbs to choose from.
What I don't know is if the carbed ones sold outside of North America were 4-port or 6-port engines.
Is there anyway to tell a 4-port from a 6-port when looking at an assembled engine? Any tell tale shape or markings on the inlet manifold?
That would be really helpful when I purchase an engine.

 

The only 13Bs carbed from the factory were the '74-'78 4-port 13Bs found in the RX-4, RX-5 Cosmo, and REPU. If you want a carbed 6-port, you'll have to get a fuel-injected one and convert it yourself. There have been a lot of people who have done it, and Racing Beat offers kits.

 

Thanks for the info.

 

No that doesn't mean there are plenty of first gen 13Bs to choose from. It means every first gen outside of North America came with a 12A. All factory carbed 13Bs are four ports. All factory N/A FI RX-7 13Bs are six port. All factory turbo RX-7 13Bs are four port. Post a WTB in the first gen section someone sells one thats already been converted every now and then.

Personally if your going to go with a carb though I'd recommend the four port. I'm preferential to a six port myself but it doesn't really give more power than a four port, just smoother better tailored power when combined with fuel injection. Of course I'm preferential to fuel injection as well. Having said that if your going to go carb get a decent street port and a good carb and you'll have pretty decent power. Just make sure to get a new fuel pump if your going to need one for your carb.

 

If you're planning on any porting at all, go with a 4-port. Makes things much easier and you can safely port much further.

 

Although the 12a turbo that was offered in Japan was Fuel injected, it was not a 13b.
There was a 13b EFI produced in Japan at the same time, but was used in a Cosmo. It was released in early 84-85 which was the same time as our 13b 6 port(also known as GSL-SE). The Series was called 13b RE-SI which stood for Rotary Engine Super Injection. I have seen a few of these forsale on Ebay.

 

It seems that the importers in my area are getting hold of carbed 13B engines which means that they must be from other models such as the RX-4s and not RX-7s. That would be the 4-port 13Bs that produce between 110 and 125HP.
I'm not against EFI but it costs more to get a car running than a carb when you don't have the control unit (going into a bug). Even the cheapest solution such as MegaSquirt costs as much as another used 13B. With the carbed one I can just bolt it on, hook up a few wires and fuel and fire it up.

I'll take a ruler to make sure that they are 13B and not 12A engines.
Thanks for the helpful info.

 

So get a EFI motor and change it to a carb. They sell 6-port intake manifolds for the 85 13b GSL-SE motors. Even sell intake manifolds for the 86-91 NA motors. Using a high compression motor will give you more power than those old 4 port 13b's

 

Actually, a better thing to do would be to use Y (SA/FB 12A) or R5 (later J-spec 4-port 13B) irons with GSL-SE or R5 housings and GSL-SE rotating assembly and make your own 4-port 13B. Then you get the massive power potential of the 4-port with the higher compression, lighter rotors, and the better chrome of the later rotor housings.

And just so you know, you'll know it's a 13B because it has "13B" stamped on the rotor housings.

EDIT: Or, even more ideally (and more expensive), a TII engine with S5 rotating assembly sans turbo.

 

The TII is a 4 port as well?

 

^yep...actually every factory turbo rotary was a 4 port, 12a's, 13b's, and 20b's

 

Technically the 20B is a six port.

 

oops, ya got me...i was only thinking of ports/rotor (2 vs 3)


damn you and your technicalities