Hey, I know some of you guys have ported your exhaust manifold. I know i could gasket match both ends but what else would be involved? I know it's probably not worth much but i can pick up a used on on CL for 50 bucks so it might be worth a shot. What do you think?

 

You dn't want to gasket match the headlfange unless the head itself is gasket matched as well. The step down will cause flow issues. Just port match. Ported stock manifolds are in most cases the stock turbo manifold of choice. There are some REAL nice tubular ones that will out perform the ported stocker, but the ported stocker wins in the bang for buck catagorey.

 

How do i go about port matching? Make a template off of the head and trace on the manifold?

 

Anyone? Or is this not really worth anything?

 

I am actually doing a write up on this for the Evo 10..complete with flow bench numbers and a how-to. I'll update this thread too when it's on there for your viewing pleasure.

 

Actually I'm not truely 100% how the pro's do it. But creating your own template would probably work.

 

i'd love to know how to go about doing this. I have a bigger 02 sitting on my desk for over a year...might as well do this at the same time.

 

Just send it to PPI. They have some pretty good prices over there. I just dropped mine off this weekend. Go PPI because they port off a head template.

 

The whole point of making this thread is that i want to do it myself, lol. Maybe if i do it i'll try to make a template of the head and draw it in ProE. I can then make a 1:1 print and you guys can print it and port away. If only it wasn't my DD for now...

 

No. Don't port the manifold at the head.

To port match the turbine side, clean the flat section of the exhaust manifold with some brake clean (so you can trace your mark). Hold the gasket onto the turbine housing, put four bolts in the holes to properly align it and trace the area to enlarge. Remove it and port away. Put back as necessary to check progress.

Be prepared to to buy some very strong bits and cutting fluid is a must.

 

just call bushur. period.

 

In order to port match the manifold you are going to need a template which you probably know. How the vendors do it and same way I do is use a flange for a turbo kit which is machined to match the head and then trace it out. I am porting tomorrow and can take some pictures of the process if you guys like. I don"t recommend going this route unless you plan on porting more than just one manifold since the flange costs at least $50. The turbo to manifold gasket is is the proper port size for the bottom of the manifold. This is cast iron so carbide bits are needed and cost a lot.

 

Thanks for the tip, Knew i would be dealing with carbide

 

Anyone have any feedback from their porting job? I'm probably going to start on this sometime this week.

 

Which part do you really want to know about? Looks like we have all answered everything.

Bits needed:
Carbide burrs ( Cylinder with a round tip and a tree work great for me)
No need for stones as the carbide did most of the work
Sand paper rolls (60 and 120 grit)

As far as the runners go since you basically can't touch the port sizes which to me is the most important part you can at least clean them up. The stock manifold does have little craters inside that have allowed carbon deposits to build up and wouldn't hurt to smooth those out. Six inch carbide bits and long extension on the sand paper rolls do a great job for that. Then flip that sucker over and go to town gasket matching the turbo side. I would also port the hotside if I were you to match them up. That is basically it.