Hey just wondering if anyone can tell me if i can put 12a endplates on my 13b 6 port to convert it to a 4 port. David at Rotamotive told me if i want more power im better of with a 4 port...I blew my engine up and am about to rebuild it i have a 12a out of my old rx7 sitting around can this be done and if so what other modifications would have to made? Would be greatfull for any help..

 

Much easier to just use turbo housings and irons because of the seal grooves are difffernt.

 

Thanks for the help mate

 

Won't putting 12a endplates on a 6 port turn it back into a 4 port engine? or am i missing something somewhere?

 

Yes, but the grooves are different. Turbo end plates would be the way to go if a 4-port is what he's seeking.

 

If your 6-port is the original gsl-se motor then the coolant seals are the same as 12a,
if its out of an 86 or later thats when you would have the problem with coolant seal grooves.

 

Wouldnt the port timing off a t2 engine not be optimal for NA performance?

I read the 6 ports dont have much material to port, but I would think the 6 port setup would have best poewrband, Why not 6 port bridgeport?

Are you going for peak hp?

 

True

 

Interesting, I asked in the 2nd gen forum about building a NA engine based off my s4 t2 irons, and Aaron told me the 6 port would b better platform.

Id the 4 port is better for peak hp, how much peak hp are we talking about? When would powerband kick in?

 

Maybe the OP isn't staying N/A

 

The OP is from assie land. They didn't get the GSL-SE so that means his 6 port is '86-'92, so the coolant seals are going to be a problem.

 

Im running the T2 side irons and a 12a center on my 13b NA. Still breaking it in but it feels strong so far.

 

did you have the irons machine for the orings?

 

IIRC the 13B-REW had the same coolant paths as the 13B N/A, so maybe he could get some REW irons? The only problem would me mounting the motor at that point...

Maybe he could use side plates off of an older 4 port 13B, like from a REPU or something.

 

My engines mild extend ported with series 4 throttle body with series 5 turbo... I was told buy my mechanic that 6 ports dont have much material to port..I think im gonna stay with the 6 port it still had plenty enough power to keep me happy

 

Nah its turbo

 

Oh, turbo, i was thinking na the whole time

 

No I had the grooves filled on the TII plates before lapping.

But I have seen motors run 2 orings in each groove before. Cant say how long it will last like that but I have seen it done.

 

I thought gsl-se's were 4 port. I think i've heard that before.