I'm building a copy of the performer x for my B18C
runner 8.5"- 8.75"
plenum 2250ml

Anyone know the inner diameter of the runner?

 

nobody knows?
44mm inner diameter can be?

 

I'll measure mine this afternoon for you when i get home.

 

Ohh thanks!!!! Please!!!, I need this measure to complete the project.
it is for a crx swap B18C 11.8:1

 

Just curious, by why not buy one? If you're trying to replicate it, just seems much easier. That's me though.

 

If I lived in the US I do not doubt, where I'm from is very expensive to import

 

Ahhhh gotcha.

Good luck!

 

Please, anyone who knows the measure?

 

Measure the port entry on the head? I can't imagine it would be different by that much.

 

I not think so, if not all aftermarket IM have the same diameter runners.
itr manifold, b16, skunk, all, the entry port on the head are equal only to match the head port, but the internal diameters of runnes are different.
sorry for my Inglés.

 

I have a few different intake manifolds I could try and measure for you later today. I think I have a blox ITR style, oem ITR, Victor X, and a few LS manifolds.
If you have a general range of runner inlet size, you could probably get close to what your looking for. Then design in your taper to the port entry.

What country are you in?

 

ok thanks, it would be Helpful for me !!!
I am from peru

 

Your measured 44mm sounds about right in the range of the manifolds I just measured.

I was measuring about 1.8 inches in the OEM ITR and the Blox ITR copy and about 2 inches on the lightly ported victor X. These are rough measurements.

 

Beautiful ladies down there ☺.
Post pics of your manifold. Love seeing custom built stuff.

 

OEM ITR
Right around 1.8 - 1.9 inches.

 

ooooh thanks !!!, is a very valuable information !!!
and the length of the runner of the ITR and BLOX is the same as performer x ?? 8.5 "- 9"
When I finish I'll upload pictures of custom IM

 

This is OEM ITR. Runner for cylinder 3.
Tape measure was not straight so I estimate 8 inches or so. The Blox is pretty much the same.
I'm pretty sure the performer X has longer runners.

 

Blox ITR style
8 inches

 

Good information that you contribute, what I'm not sure is whether the plenum of the performer x is 2250ml, It is a measure that I took another thread, but I'm not sure...

 

About 48mm.

 

I just checked my gsr performer x and the port outlet size (where the manifold meets the head) are 2" or 51mm in diameter. Hope that helps your build.