Port matching on turbo ?

[k2diesel]

I'm getting ready to install a 12cm wastegated turbine housing that I got from glhs. Has anyone match ported a turbine hot side housing to the exhaust manifold? O K, and how about the center web that divides the two ports at the inlet to the hot side housing, anybody ever grind material away to accomplish a path for exhaust gases to flow ( or at least be equalized ) from the front non-gated port, to the rear gated port? TIA K2

 

[Greenleaf]

Set the gasket onto the turbo flange and trace around the I. D. grind to match then polish. Do the same to the flange on ther manifold. Then do the same to the inlet ports of the manifold. Go in as far as you can, porting and polishing. If your concerned about getting to thin... ... do more polishing than porting. OR throw caution to the four winds and grind away. These manifolds are not rare and a new ATS will look better on your truck IMHO



Scott

 

[Mad Bomber]

We have a person on www.NWBombers.com that does it all the time. BTW he port matched the turbo and Ex manifold for me. Follow the link it should help you http://www.webpowerplus.org/~pwrwagn/cgi-bin/forum/ikonboard.cgi?;act=ST;f=3;t=5406

 

[JLEONARD]

I ported my 16 housing prior to installation in the manner that GL described.

Jay

 

[CDegner]

I had HDM48 do mine as well. He spends some serious time on it and does it well! He did both my 16cm and non-wastegated 14cm that I am running now.



If you do your own, be cautious in 2 spots. ON the lower corners, the outside shows a couple indentions. If you grind all the way to match up with your gasket, you will be really thin on your housing and iwll probably break through if you get your EGTs up a little to high.



BTW, I also had him port my manifold. I saw a significantl reduction in EGTs and much faster spoolup after having the work done. I can now run 80 down the freeway and my EGT is about 625 with 8 lbs boost.



Carl

 

[BushWakr - RIP]

Just use some care... if you go too far you can reduce gas velocity and wipe out some/most of your porting gains.

On the inlet to the hot end housing, you'll see the dark sooted up marks left from the gases as they've entered the housing.

Bevel those at an angle inward a short distance and then do some smoothing of the pockmarking in the cast... from there polish in as far as you can go.

On the manifold the same applies. You want to create a slight venturi effect (my words) as the gases enter the runners... . again, reach in and smooth then posish as much as possible.

If you go easy on your first attempt you can always go back and do more.

Gaskets are cheap right...

Guy's like Dave have lots of experience and can just "feel" the right amount/depth/finish needed... . us guys who are trying it out need to be careful. In fact it was Dave and Piers who offered some of the above advice on this process.



I did my hot end housing, the intlet and outlet on the manifold and and at highway speed I saw roughly 80*F reduction in temps. ... . not bad for a first attempt.



pb... .

 

[Joseph Donnelly]

Having spent 12 years on turbo development while at Cummins, Mark Chapple (TST) told me it is a waste of time.

 

[Gary - K7GLD]

"Having spent 12 years on turbo development while at Cummins, Mark Chapple (TST) told me it is a waste of time. "



HMMMmm - "waste of time" in what parameter?



Some guys are primarily looking for more power, others for faster spoolup - some want to lower EGT's - and HAVE according to a couple up above... Before *I* would want to toss out a blanket condemnation of the practice, I'd sorta want to know what exactly the end goal was for the owner...

 

[Mad Bomber]

"Having spent 12 years on turbo development while at Cummins, Mark Chapple (TST) told me it is a waste of time. "



HMMMmm - "waste of time" in what parameter?



Some guys are primarily looking for more power, others for faster spoolup - some want to lower EGT's - and HAVE according to a couple up above... Before *I* would want to toss out a blanket condemnation of the practice, I'd sorta want to know what exactly the end goal was for the owner...

Good point Gary, I'm wanting less EGT's and free flowing. It seems that when Dave Miller did mine he port matched the manifold to head and had to take 3/16 off every port off my ATS. JMHO this has got to help free flow more and that = lower EGT's.