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Old 10-15-2008, 08:46 PM   #1 (permalink)
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Default Porting exhaust manifold tips and tricks?

I am going to port/polish and ceramic coat my exhaust manifolds. Started on it a little tonight. I can see why it would be beneficial the edges look very thick and restrictive. I'm looking for advice from those that have done it. I'm using a die grinder, I have a dremel but that just seems to small.
What kind of bit do you recommend. I'm using a grinder bit but seems to be very, very slow. Pic's of your finished product would be good too.
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Old 10-15-2008, 09:22 PM   #2 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

I've never done it on a 3s. But They way I've always done my V-8's is take and old gasket and put it up to the ports, typically the ports will be smaller than the gasket so take some black spray paint (or whatever color you have) and spray the ports using the gasket as kind of a "stencil" for lack of a better word. After that take your dremel and starting going at it. Just keep grinding metal until you get to the edge of your paint line. Then Hours, days, weeks, months, years later itching and covered little shards of metal take a bolt and cut a notch in it then fold some sand paper up and slide it in the notch. put your bolt in a die grinder or even a drill will work and start polishing. go from like 180 or 320 grit and work your way up. I could spend hours and hours and hours porting/polishing. I typically don't do manifolds, Lots of head work though
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Old 10-16-2008, 06:40 AM   #3 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

I just took material out until the inner 'ring' of material was tangent (or flush, however you want to look at it) with the hard metal 'ring' on the outlet (which matches the gasket hole).

It's also important to port match your turbo's turbine inlet - you don't want any ledges, you want it as wide and smooth as you can get it. Afaik.
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Old 10-16-2008, 09:14 AM   #4 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

Did you use carbide burrs, like in the picture. I was using more of a grinding disk seemed real slow. If these will make it faster I'm going to buy some.
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Old 10-16-2008, 09:16 AM   #5 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

Yep I used a die grinder with a tip like that, I can't remember what shape it was. It was pretty beefy.
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Old 10-16-2008, 09:21 AM   #6 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

Instead of a bolt and sand paper, use a flapper wheel for polishing.
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Old 10-16-2008, 11:37 AM   #7 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

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Instead of a bolt and sand paper, use a flapper wheel for polishing.
That works too. But Its has just been my past experience that using the bolt trick leaves a more uniform and even polish because you aren't haven't to actually touch the edges with anything hard and it also gets all four sides at once instead of having to do it one wall at a time. Just hold the bolt in the center of the port and the sandpaper just kind of "slaps" the inside walls as the centrifugal force stretches the paper out.
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Old 10-16-2008, 11:44 AM   #8 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

i just recently ported my turbo exhaust sides and have done my manifolds. definitely get carbide tips. they will chew thru the metal like butter. took me 2 hours on my turbos and probably less than that for my manifolds.
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Old 10-16-2008, 11:45 AM   #9 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

my question is, how much do you actually gain from this? Is it worth the headache of pulling your manis out?
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Old 10-16-2008, 01:09 PM   #10 (permalink)
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Default Re: Porting exhaust manifold tips and tricks?

u should get quicker spool up on the turbos. it's not necessary, but i'd do it if the stuff was coming out anyways.
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