2G exhaust manifold porting

[dugjr24]

I recently bought a used exhaust manifold in good shape and the guy told me it had been ported. Now correct me if I am wrong but the exit of the manifold that connects to the turbine measures 6cm in diameter. I measured it and it was exactly 6cm. Now my turbo is ported to 7cm and I know I'm not getting the full benefit with a stock manifold. What I am trying to figure out is if the new manifold should measure larger than 6cm if it was ported?

 

[blcknspo0ln]

6cm is stock.. he lied to you.

go buy a diegrinder and carbide bits and port that sumbitch out

 

[dugjr24]

thats what I thought. I knew it should have been bigger than 6cm. thanks man

 

[1993eclipseGS]

Maybe it is ported. Is the lip gone on the collector side? If you look in it, There would be a step if it wasen't ported. You would be able to see the lip/step.. For the side with the 4 runners, Put the gasket up to it.. If they match with the gasket, It was ported. If it wasen't ported, The gasket holes would be bigger then the exhaust manifold holes..

Here's a pic of mine that I did.

 

[maximumbob]

Well it could have been "ported" to their particular standards. For example they could have cleaned up the inside of the collector and edged the dividers. However to answer your question the typical port job does consist of removing the inner ridge where the metal ring sits. This makes the opening about 7cm so people just go ahead and port match it to a 7cm gasket.

 

[OneGeeAWD]

if your not sure then just match it up to a 7cm gasket. if it doesnt match then port the bi*** til it does, that way you can be sure your getting the full benefit of a ported manifold even if the guy you bought it from did clean it up a little bit.

 

[dugjr24]

yea it doesnt match up to a 7cm gasket and the lip is still there. So I guess I have some porting to be done in the future. Thanks for the help guys.

 

[blcknspo0ln]

you could always send it to me for a small fee and i'll port it for you

 

[jmc94gsx]

You need to see places like BR port. You really don't need to spend that much time, smoothing out the runners and removing the lip at the collector are the main things, other that that you will not need to do too much more.
For those about to port match, be careful and aware that there are two different types of exhaust manifold gaskets, a composite one and the metal bilayer. THe composite has larger ports, if you port match you will really hog this out which is not a performance benefit. To match port you will not have to labor too much to get the job done.
If you have a good air compressor, die grinder, and a carbide bit port matching will not take a lot of time, about 5 minutes or so for each runner ported and matched.

 

[dugjr24]

I dont have any of that. I'll probably just have a local machine shop do it for about 30 bucks.