has anyone here set up a gen1 12A with 5/6 ports at all?

theres a guy int he city that has one. anyone here done it and what kind of difference did you notice?

 

Well. The 12a did not have 6 ports.
The early 13b did not have 6 ports, it had 4.

I dont know why youd want to put a 12a in FC anyway.

 

The 12A 6 port wasn't sold in the US.

 

There was a 12A 6-port (carbureted) sold starting in '81 in Japan.

There was a US-only model RX-7 sold in '84 and '85 called the GSL-SE, it has a fuel injected 13B 6-port in it.

Making a 6-port 12A block would be easy with readily available parts - just put GSL-SE endplates on a 12A. Voila, 12A 6-port. The hard part is getting an intake manifold for it that has the 6-port actuators, my guess is the only place you can get a manifold for a 12A 6P is from one of the Japanese engines that came that way. Any other way would render the 6-ports useless and you might as well just go with a big street port.

FCs are kinda big and heavy, I don't know why you'd want to put a 12A in one other than, say, having a dead FC and a live 12A and nothing better to do with your time. (Hey, I was considering it for a short while...)

 

Big and heavy? Hey! My SA is heavier than my FC (base model) by 200 LBs...Must be that damn thermal reactor.

 

misunderstanding. the 6 ports were going into a gen1(non gsl-se) not a gen2.

i believe he used gen2 parts to accomplish this. that what i hear anyway.

so it was a 12a in gen1 w/6 ports.

 

It can be done if you use the irons from an '84-'85 GSL-SE. I don't think the FC water jackets match up properly. However, I don't understand why you would want to go through all that work when you could make much more HP by streetporting your 12A.

 

Right, the hard part would be locating or making an intake manifold for the 6-ports... it'd end up that for less hassle you can make a street port 4-port that makes more power.

 

Mixing FC and 12A engine parts does not work. The coolant seals are in different places.