Is ther any reason i should rebuild this extra engine i have? would it be worth my while or should i just get rid of it and concentrate on my 12a? i have a 79 rx-7. let me know... thanks

 

i'm bout to be putting my 6 port 13B into my 84 GSL... i think it will totally be worth it... street ported mmmmm it'll be fun... too bad i don't got the float kit for my holley

 

Are you asking if you should replace the 12a with the 13b? It depends on how much you value torque and your bank account, I suppose.

 

Do it! Rebuild the B and swap it in when your 12A let's go.

 

No, just give it to me,lol. Really it's worth it. Your looking at 34hp in stock injected trim than your 12a. Don't recommend that you do the injection/ecu thing though.
Put a mikuni 44phh on it with the RB header system, lightened steel flywheel. After that you will be saying " DAMN, RX7doctor sure is a wise man",lol. rx7doctor

 

okay maybe you guys are right.. but i thought there wasnt as much to do to the 6 port isnt it harder to find intakes?

 

that kind of answers a question i had. are the intakes for the 13b 6 ports different than the 4 ports or turbo engines?....if i had a gsl-se 6 port with rb intake, could i use the same intake on a TII engine? i guess not?

 

Proper 6port inlet manifolds should have seperate tracts for each of the inlets on the end plates. I have previously had an aftermarket one that didn't.

I believe you can fit the 2nd gen turbo inlets to a 6port inlet but the air flow gets nasty as the ports don't line up.

Were you after stock or aftermarket inlet manifolds? I use a 48ida on my 6port and use the aftermarket inlet manifold. I wouldn't have called it rare....

You can get adaptor plates that will mate an early factory 13b carb inlet manifold to the later 13bT block - it should therefore be doable to make an adapter to fit any 13b inlet to a 6port ~ with the actuators removed.

My 6port was rebuilt with a late 1st gen centre plate, and the centre plate tracts and the 3rd and 4th tracts in the end plates bridged. Its only being run in, (the carb is set for a stock6port and the timing is at about 0deg) but it seems to show promise.

 

No, just give it to me, Really

 

Like was mentioned above, you should be able to get an intake with 6 separate ports for the engine depending on the carb you're using. Somewhere on this board, I've posted a couple of vendors that I've found for a 48 IDA. If the engine's ported, it should easily make 200hp at the flywheel and have noticably more torque than the 12a.

 

okay sounds good... i guess i will try to rebuildit... i have another question though.. are the accessories on the outside of the engine the same on the 12a and 6 port 13b? like the alternator and all that

 

carburated 13b! www.peircemanifolds.com will be ur friend on that one too

 

one thing i missed to ask...

will the intake manifolds, header, etc. work for an 86 and up 6 port 13b, from a 84-85 gslse 6 port 13b? is the only difference between these motors the internals?

 

your link is wrong you spelled pierce peirce

 

If this is an S3 6 port, use 12a end plates and bridgeport it. I personally think the 4 port has far more potential than the 6 port. It's easier to get past 200 hp with a ported 12a than it is 6 port.

The only thing I haven't figured out yet is a good source or choice for the intake manifold. There are, however, adapter plates to go from 6 port to the 12a intakes. Finding one might be an entirely different matter.

 

thanks for the advice i will contemplate it..

 

You can make just as much power street porting a 6-port as you can street porting a 4-port.