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How to port a JDM ITR header

Discussion in 'Engine Building' started by civicious, Dec 14, 2004.

  1. civicious

    civicious FüK-VTEC VIP

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    Ok, stock the JDM Integra Type-R headers come welded on the inside of the flange, and just a couplea spot welds on the outside. This has GOT to kill the flow somewhat, so I decided to do something about it. First, I welded the runners to the flange on the outside. After welding the outside, I took a pneumatic dremel and got to work grinding down the inside of the runners. Took me about 45 minutes per runner to grind it, then around 5-10 per runner to polish it with a battery Dremel. It's not perfect, but it'll flow a LOT better without that weld on the inside.

    [​IMG]
     
  2. 92civicb18b1

    92civicb18b1 The Trisexual

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    ehh...
    [​IMG]

    Yours is a little choppy, It's actaully gonna fuck up the flow, it will flow a little better but it's gonna be directed in all different directions and shit. I think you should go back at it and try to smooth it out a little more.
     
  3. cycloneb18c3

    cycloneb18c3 Senior Member

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    looks good to me, but I know the welds have to be really strong where the pipes connect to the flange. Ive seen a couple aftermarket type r headers that have blown a hole where the pipes connect to the flange. 1 is the powercore jdm type R, and the other one was a DC one.
    I think you left the welds inside partially intack, but just grinded them down so they were smooth, correct?
     
  4. civicious

    civicious FüK-VTEC VIP

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    The exhaust is going one direction....out. I polished the runners so they're perfectly smooth, you can't really tell in the pics.

    And yeah, we left the welds partially intact, we just smoothed them out. The outer welds are there for support.
     
  5. swanny

    swanny Senior Member

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    Looks good, you shouldve ran your car with it as is then port it and give us a butt dyno.
     
  6. StyleTEG

    StyleTEG Senior Member

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    Don't forget that the whole inside is going to be covered in carbon anyways, so surface texture isn't going to make much of a difference.
     
  7. civicious

    civicious FüK-VTEC VIP

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    :slap:

    you're wrong. The ITR headers have a weld on the INSIDE of the header, that sticks about 2mm into the tubing. I'm not going to get 2mm of carbon buildup anytime soon.
     
  8. AllMotorMonster

    AllMotorMonster Senior Member

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    Welcome to about 2 years ago.....

    NEways......

    Great MOD for the JDM ITR header, it's just a bitch grinding down the original TIG welds and making them nice. Makes nice LOUD noises and drives the neighboors NUTS when doing them.

    As for "but if it hindered power..... blah blah blah", it's been proven to add 10+ WHP just from porting the manifold.
     
  9. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Wow. That's a big jump- but nothing surprising, considering how much the welds block flow right after the flange.
     
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