4 port n/a vs TII
 

On the engines what is the difference besides the rotors? are the side housings all the same?

I have a TII motor and want to turn it to an n/a but I dont know if the ports are the same. Are they the same?

I'm not exactly sure on this one, but I think that the intake ports are different than the older 13b's. Don't take my word on that though.

regardless of 4 port or 6 port, all 74-85 13B engines have the water o-rings in the rotor housing, and all 86 and up 13B's have them in the side housings. that's the first difference.

furthermore, the newer 13B's have a different intake stud/bolt pattern which makes bolting intakes meant for the older engines, functionally impossible.

if you really want to build an N/A 4 port engine based on the 86+ T2 engines, then you will have to choose your intake setup very carefully (especially if working on a budget) because your choices are going to limited. the only manifold i know that will bolt to them is for Weber carbs and you can get them through Mazdatrix.

Thanks :) So the weber carb manifold will bolt up onto the 13bt?

That was my plan all along.. To get the weber wrap around manifold and I guess That it also needs an adapter to fit up to a 13b. but mazdatrix sells all of that.

But basically how the ports and how the manifolds bolt on to the engine is the same?

no. no adapter needed for the one i'm talking about. it's the manifold for IDA (and it's derivative) carbs.

here is a picture of it. [img]C:\WINDOWS\Desktop\santo diablo 02\Pictures\rotary files\13BT IDA manifold.jpg[/img]
and here is the link to the site: http://www.mazdatrix.com/r-idamanifolds.htm

i think they also have holley intakes for the 13bt's

mike