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Old 08-14-2011, 09:43 PM   #1
tonka9999
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Question Porting the H23 IM or Double stack? or Both

I just got my second H23 IM
"Double Stacking" is an option that i have ... but what if you where to port the IM as well. So have the IM double stack and ported...? has any body tried it? If it worked is there a DIY on how to Port IM? Thanks

Last edited by tonka9999; 08-18-2011 at 06:01 AM.
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Old 08-14-2011, 09:53 PM   #2
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I wouldn't bother porting the IM. I assume this is going on an F22A... The manifold will flow just fine. Too much airflow, and the engine won't know what to do with it.
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Old 08-14-2011, 10:29 PM   #3
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That make since... hey it a smaller Pic this time Im learning! haha Thanks
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Old 08-14-2011, 10:35 PM   #4
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Quote:
Originally Posted by deevergote View Post
I wouldn't bother porting the IM. I assume this is going on an F22A... The manifold will flow just fine. Too much airflow, and the engine won't know what to do with it.
especially if you are not tuning the ECU.
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Old 08-14-2011, 10:43 PM   #5
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You could try extrude honing. That allows the best possible porting, provided you still wanted to go that route.
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Old 08-14-2011, 10:45 PM   #6
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Quote:
Originally Posted by The G-Man View Post
especially if you are not tuning the ECU.
Damn Gary, haven't seen you around in a bit!


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Originally Posted by The Producer View Post
You could try extrude honing. That allows the best possible porting, provided you still wanted to go that route.
That's true... but that's probably a good deal out of his price range. Extrude honing is stupid expensive.
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Old 08-14-2011, 10:52 PM   #7
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Quote:
Originally Posted by deevergote View Post
That's true... but that's probably a good deal out of his price range. Extrude honing is stupid expensive.
I guess that explains why I've only read about it!
Has anyone on here done it?
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Old 08-15-2011, 01:33 AM   #8
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If your going to do anything to the intake manifold, the term you want is flow balancing and gasket matching. The service I had on my intake manifold was just this, and the imperfections in casting were smoothed out/removed. To take full advantage of the gasket matching, I would also need to have intake side of the head ported/gasket matched as well.
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Old 08-15-2011, 03:34 PM   #9
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ok what about just gasket matching the two IAB spacer's and TB?
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Old 08-15-2011, 03:41 PM   #10
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Quote:
Originally Posted by tonka9999 View Post
ok what about just gasket matching the two IAB spacer's and TB?
CHRRacing is where I had my intake manifold flowbalanced/polished/gasketmatched. The IAB spacers do not even need to be modified. If my throttle body had been bored, CHRRacing would have matched the opening of the throttle body to the plenum as part of the service also.











Hybrid Intake:


A6 Runners w/Flow Numbers:

Plugged gutted IAB spacer:

H23 Plenum


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Old 08-18-2011, 06:00 AM   #11
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Good help

Im going to try do it all my self...at least polishing them! Thanks for the info and pics!
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