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Old 09-30-2007, 08:54 PM   #1
upjeeper
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Default Which carbide burrs for a port/polish job?

i'm going to stop by Airgas later this week and get some bits to do a port and polish of my tgv's and intake, maybe even my heads. Which shape of burrs do you guys recommend? there are trees, flames, cylinders, balls, etc...thanks
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Old 10-01-2007, 12:51 PM   #2
gumby647
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I tend to use mostly ovals and the cylinders with the rounded ends. You want to make sure to get the aluminum burrs because the steel ones will load up real fast. You'll also want some various sizes and grits of sandpaper cartridge rolls and some scotchbright x-buffs to finish it off.
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Old 10-01-2007, 01:15 PM   #3
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ovals, acorns and small barrels are quite useful...balls can be too...unfamiliar with flames...?
don't forget your sanding barrels and flap wheel sanding bits.
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Old 10-01-2007, 01:53 PM   #4
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for surface polishing, the 3M bristle discs work AMAZING...

I polished my entire intake manifold, & ported and then polished my TB with the bristle disc....as well as various other engine parts. good stuff.

I wish they made a similar product on a longer shaft for use in recessed polishing...
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Old 10-01-2007, 03:26 PM   #5
upjeeper
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i'm looking at getting some off the burrs that are 6 inches long for internal work to my TB and manifold. You guys didn't find you needed anything that long?

the flame shaped ones look like this

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Old 10-01-2007, 03:56 PM   #6
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Quote:
Originally Posted by IllNastyImpreza View Post
I wish they made a similar product on a longer shaft for use in recessed polishing...
You could use cratex points or wheels. I usually find that after sanding I can get my desired surface finish with the x-buffs. I do like to use cratex in the combustion chamber though since I feel it's easier to control and there's less chance of damaging a valve seat.
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Old 10-01-2007, 04:15 PM   #7
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i've been looking for one myself and i can't find one that long.

Quote:
Originally Posted by upjeeper View Post
i'm looking at getting some off the burrs that are 6 inches long for internal work to my TB and manifold. You guys didn't find you needed anything that long?

the flame shaped ones look like this

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Old 10-01-2007, 08:41 PM   #8
subaru5614
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for surface polishing, the 3M bristle discs work AMAZING...

I polished my entire intake manifold, & ported and then polished my TB with the bristle disc....as well as various other engine parts. good stuff.

I wish they made a similar product on a longer shaft for use in recessed polishing...
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Old 10-02-2007, 11:41 AM   #9
IllNastyImpreza
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Quote:
Originally Posted by gumby647 View Post
You could use cratex points or wheels. I usually find that after sanding I can get my desired surface finish with the x-buffs. I do like to use cratex in the combustion chamber though since I feel it's easier to control and there's less chance of damaging a valve seat.
where can I find that stuff ??
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Old 10-02-2007, 11:56 AM   #10
gumby647
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I can usually find everything I need from McMaster Carr, Enco or MSC. Goodson and Silver Seal usually have more of the specialized engine stuff.

Oh yeah, If you are doing something small you can get Dremel cratex stuff at Lowes/Home Depot.
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