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Discussion Starter #1
Will I receive a gain or anythign from porting and polishing my 60mm b20 tb. I have ported my intake to match the tb, but would it help anything to port and/or polish my tb since the butterfly inside is only 60mm anyways.

I put this in the forced injection section because it is goin on a turbo z6.
 

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As long as the IM is port matched to the TB then it's good.
 

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Discussion Starter #4
Ok.

I know on some of the dsm and jeep they will take a tb and port it out to match a bigged butterfly.

I have also seen some that where smaller at the opening than they where at the butterfly and have seen some smaller behind the butter fly.

What do you mean port matching = bad?

I'm not port matching the intake to the head.
 

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Why would port matching be good?
Think about why a TB that's smaller than the opening in the IM would be good.
(Think one-way street).

The butterfly is probably 60mm. If you hog the TB out, you won't have the TB work correctly.
Won't pull vacuum, won't respond properly, etc.
 

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Discussion Starter #6
I still dont see why port matching a tb to a intake mani isnt a good thing.

Everything I have read says if you upgrade the tb you need to port match the intake.

If your not goin to open up the intake opening then whats the point of getting a bigger tb.

The bigger the tb the more air it allows in. If the opening in the intake is the stock size you not goin to allow more air in and what does come in is goin to be more turbulent do to the fact its hitting the sharp edges of the intake mani opening.
 

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Discussion Starter #9
Thats what I was sayin openin up the mani as big or bigger than the tb. I didnt realize that design to these tb's until I got it all apart cleaning it.


I have a tb like this, bored to 70mm. check out polar bear tuning.
I didnt know if people did it with Honda tb's or not. I know with the jeeps its kinda hard to find a big one for them and they are really high when you do.
 

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While on the subject of port matching TB to IM can a z6 IM be bored to 62mm? Or should I save up for a Skunk 2 IM (since I am going to get one for some engine bay bling) and use my LS TB with that and use the stock z6 TB with the z6 IM till then?
 

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Discussion Starter #12
I was able to port mine out to 60mm no prob. I am sure you could go further if you wanted to. I have still got approx 1/4" thick material where the flange transitions into the plenum.

Are your sure your LS is 62mm? I thought they where the same as the b20 at 60mm. Mine is a b20 tb.

This is what it looks like opened up to 60mm.
 

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I was able to port mine out to 60mm no prob. I am sure you could go further if you wanted to. I have still got approx 1/4" thick material where the flange transitions into the plenum.

Are your sure your LS is 62mm? I thought they where the same as the b20 at 60mm. Mine is a b20 tb.

This is what it looks like opened up to 60mm.
Well for the anti-reversion the LS being 60mm the IM would have to be bored to 62mm correct? Awesome that the intake manifold can be opened up so much.
 

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Discussion Starter #17 (Edited)
Any one have the thoughts on a Intake mani thats painted black? Will it cause probs with it being black. Probs like heat soak or anything.

I cleaned it but its all tarnished up and grayish looking. Not like clean aluminum. So I was thinkin flat black. Here is a pic of it as it sits right now. Or should I just leave it how it is?



You can see the color diff between the tb and the intake.
 

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in for thoughts about boring the throttle body; wondering the same thing.

and for the intake mani, that looks pretty clean to me, i wouldnt paint it... it would be a pain in the ass to take off if it ever started flaking or whatever. plus i like the silver look anyways, if anything id hit it with a silver paint.
 

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were talking about material properties not light absorption and it conducts the heat throughout the surface not radiating it... but thats not even the case here, were talking about paint. it wont have any negative effects on the manifold
 
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