Uneven bore (circle) on ported blox intake manifold, will any problems occur?

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Old Apr 15, 2012 | 07:32 PM
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Icon2 Uneven bore (circle) on ported blox intake manifold, will any problems occur?

I ported my intake manifold with a dremel tool to about 2.75 inch or 70mm throttle body omni and it is a little uneven of a circle will that affect idle. I am thinking that it won't because the throttle body and gasket will be blocking the excess ported area. I really want to find out because other wise I will try to fix it, and if it is fine and will run the same either way I will leave it alone.
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Old Apr 15, 2012 | 07:39 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

im sure it'll create some turbulence in the plenum. how it will effect performance, i dont know..
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Old Apr 15, 2012 | 07:43 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

so it should be fine then? It won't create an idleing problem because the throttle body and gasket is blocking off the excess area I ported off, right?
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Old Apr 15, 2012 | 08:06 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

did you grind into the IACV or FITV area?
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Old Apr 15, 2012 | 08:27 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

no i didn't hit either area so do you think it will be ok?
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Old Apr 15, 2012 | 08:34 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Ill get a picture up asap.
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Old Apr 16, 2012 | 08:47 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

how do you put a picture?
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Old Apr 16, 2012 | 08:47 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

of my own
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Old Apr 16, 2012 | 08:52 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?



will this be ok, and do you think any problems shall occur?
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Old Apr 16, 2012 | 09:31 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

doubtful since your boosting and not relying on a smooth vacuum draw like NA
of course, this is my hypothesis and not actual fact.
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Old Apr 16, 2012 | 09:56 PM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

ok thanks any more input would like to install or do I have to take it to a shop to have it all evened out?
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Old Apr 17, 2012 | 04:06 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

I highly doubt that will cause you any issue. I'd be looking elsewhere before i started pointing my finger at that for idle issues.
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Old Apr 17, 2012 | 04:37 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

The only thing I could see would be turbulence in the intake manifold, but even before you bored that out the air would have hit the edges of the intake manifold and caused turbulence too, I think you'll be okay.
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Old Apr 17, 2012 | 06:10 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

cool thanks everybody I haven't installed it yet but now I will And I was wondering should I try to even it out or just leave it alone and it's going together with a omni 70mm throttle body
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Old Apr 17, 2012 | 06:43 AM
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Icon2 Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Originally Posted by turbolsvtecej1
cool thanks everybody I haven't installed it yet but now I will And I was wondering should I try to even it out or just leave it alone and it's going together with a omni 70mm throttle body
ANY INPUT?
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Old Apr 17, 2012 | 07:17 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Just try it...
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Old Apr 17, 2012 | 08:23 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

As long as the hole on the throttle body is bigger than the hole on the manifold they'll be no issue regarding turbulence on this matter.
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Old Apr 17, 2012 | 09:03 AM
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Icon2 Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Originally Posted by rich7777
As long as the hole on the throttle body is bigger than the hole on the manifold they'll be no issue regarding turbulence on this matter.
Their almost the same size but I was wondering if I should try to make it as even as a circle as possible or should I just leave it alone, and put it on?
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Old Apr 17, 2012 | 09:07 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

You could if you wanted, you won't gain from it though. Like i say as long as the throttle body hole is smaller than the inlet hole you'll be fine.

P.S. Sorry i got what i posted above mixed up.
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Old Apr 17, 2012 | 09:08 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Find somebody with a lathe and do it the right way.
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Old Apr 17, 2012 | 09:10 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Originally Posted by rich7777
You could if you wanted, you won't gain from it though. Like i say as long as the throttle body hole is smaller than the inlet hole you'll be fine.

P.S. Sorry i got what i posted above mixed up.

Ok thanks very much greatly appreciated was thinking I was screwed for a moment their "whew"
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Old Apr 17, 2012 | 09:12 AM
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Icon2 Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Originally Posted by speedooo
Find somebody with a lathe and do it the right way.
what do you mean kind of like a line bore like what you would do to make the girdle and main caps true?
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Old Apr 17, 2012 | 09:15 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Originally Posted by turbolsvtecej1
Ok thanks very much greatly appreciated was thinking I was screwed for a moment their "whew"

No problem Basically what i was getting at is that you don't want the flow of air to hit a step. If its going from small > big it wont. But if its going from big > small it will.
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Old Apr 17, 2012 | 09:16 AM
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Default Re: Uneven bore (circle) on ported blox intake manifold, will any problems occur?

Originally Posted by rich7777
No problem Basically what i was getting at is that you don't want the flow of air to hit a step. If its going from small > big it wont. But if its going from big > small it will.
ok cool understand you now, I was thinking the same thing lol
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