I need help sizing my exhaust port to my new bridged intake ports. I don't have a template for the exhaust, so I'm just going to make my own template. The exhaust ports were streetported by RX7store previously, but I think I should make them a bit bigger and put a larger radius on them. Can someone give me an idea of how much I should port up or down? I've already got a pretty good idea of the shape and radius size I'm going to make, I just need some experienced input on how much to port up or down.


Pic of current port size:





Here is a pic of the bridge size:

 

This is a racing beat template on a practice housng. I used this on the street port motor I'm building. Others said it is pretty big so it would probably be pretty good for your bridge. Almost no material is removed from the top of the port so it opens earlier but has stock port closing time.

 

i'll try to snap some photos of my RB race template against an old housing for you.

 

Thanks guys, the pics are very helpful, and give me a good idea of what I need to do.

 

okay ... not very pretty at this stage, but here is one of the preliminary photos just after i got my race templates from RB. keep in mind this is a 12A, but ... it's the basic shape that you wanted, right? as you can see, it's a bit wider and it closes much later.

 

okay having a little technical difficulty here ... my file is too large and i don't seem to have editing software. so i'll keep trying.

 

attempt #6


yeah! success