what do you guys think of the port differnce ? between the fc on the right that had some porting done and the fd in the middle that had some porting done and the 13b re on the left with nothing done. 13b re

 

that is one helluva HUUUUGE port :o

 

i think whoever told you that the one on the left had nothing done to it is FOS.... the interior looks like its been smoothed out and polished.... i'd need a closer picture of the port to believe that one...

 

That's a major difference there! lol

 

That's huge! How could that not be ported?

 

13B-RE (cosmo) ports are that big from the factory, i am comparing right now. Yes, their HUGE!!! This is why these sidehousings are so wanted... Big, big big power capabilities


-Markus

 

i have a re engine going in my car right now it just got delivered, that and a bunch of other goodies. i was amazed with the ports as well so thats y i bought one for my car

 

Yeah, the order of port size goes like that (13B-RE, 13B-REW, 13BT). And the Cosmo ports are quite sizable. But there is also a bit of an optical illusion going on when you look at the port opening (were it meets the manifold). Both the 13B-RE and 13B-REW have their port runners at an angle entering the housing, were the 13BT is nearly perpendicular (right angle). So this makes the port on the REW and RE look bigger then it actually is (again, they both actually are bigger {especially width}, just not as big as they look {height}). I attached a pic to help visualization. If you actually took a cross section of the REW or RE port that was perpendicular (right angle) to the runner walls, it would be smaller and now you’d be comparing apples to apples when looking at the 13bt port. The quick sketch is not actual measurements.

Pic to big to attach sorry, but you get the idea I hope.

~Mike.............

 

What exactly would be the difference between a 13b-re engine, and a 13bt engine streetported to those sizes? What is the CR of the 13b-re? Is it any stronger, extra dowling, etc?

 

i seen them both side by side i just recieved the re and i have put the rew next to it and the re is taller ports a wider, not only that but the upper intake is sick the primerys are the same size as the secondarys and there bigger than the rew intake

 

The secondary might be the largest of all the 13B series, but the primaries are some of the smallest in the 13B series.

There is really nothing specially stronger about it - the later 13B-REW engines are supposed to be better.

All Cosmo turbo compression ratios are 9.0:1, and the rotors are basically identical to the Kouki FC turbo 13BT ones.


-Ted