s2rx7

can a 13b 6 port go into a 82 rx7 or does it have to be 4 port.

Metallic_rock

look at siggie... you can do a 6 port, but why? 4 port = the win!!

peejay

13Bs are just longer 12As.

13B 6-ports are just 4 port engines with different end housings.

Now there are different *generations* of 13B, but they aren't important if you aren't trying to mix and match internal parts or housings.

Metallic_rock

What he said /\ If you want, you can take that 6 port and turn it into a 4 port just by swapping out the end housings with ones from a 12a. Then get a 4 port intake. I love mine!!

peejay

Assuming you are starting with a '85-earlier 6 port. cRemember what I said about different generations...)

hornbm

Yep, the rotor housings gotta be from an 85 or earlier. In 86 they moved the water jacket groove to the side housing.

hotty

hmmm.. i didnt know that.. the 12A and 13B have the same size housings.. so really.. the only difference in them are the rotor width's, and rotor housing width's along with some other things such as the E-shaft? cool

peejay

Exactly.

In fact from '74 to '78 the 12A and 13B used the same side housings. The parts on the sides of the rotors from '74-85 are also the same, 12A and 13B.

Only difference is rotor width and the attendant differences due to length.

1stgen4life

iTrader: (1)

were there any power differences between the pre '86 13B and the later ones? If so, would a 13B from an fd fit in a fb?

hornbm

The power differences werent so much as in the blocks themselves, but the real power came from a MUCH better designed intake. That and the option of turbo. However getting that the FI for those intakes (in the stock form) is a roayal pain in the ***.

hotty

cool peejay.. thx for the info.. anything else i could "know more about"? I'm curious.. i thought i knew quite a bit, but always willing to learn more.

1984se

like it !

1984se

https://www.rx7club.com/forum/attach...postid=2270620