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Thread: 1st gen 7 - coolant passages in intake manifold

  1. 03-14-2007, 01:46 PM #1
    mccletus
    mccletus is offline Junior Member
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    I'm new at this, so hopefully you guys will cut me some slack .

    I'm working on prepping the car for IT (eventually), and during some recent work where I had the intake manifold off, it was recommended I plug the coolant ports going to the intake manifold. I had figured that would not be permitted, but I was told it was considered a part of the emissions system and therfore legal to plug.

    The question is can I plug these? It sure makes taking the manifold off much easier.

    Thanks
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  2. 03-14-2007, 01:55 PM #2
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    dickita15
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    That is the way I understand it as well. When I bought my car the intake was filled in with some kind of foam but the block was not plugged so I still need to use the o rings and gasket.
    dick patullo
    ner scca IT7 Rx7
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  3. 03-14-2007, 02:51 PM #3
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    lateapex911
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    Specifically allowed, "Authorized mods" D,1, d. page 296 of your 2007 GCR. If you don't have the 2007 GCR, you should get one ASAP, it'll save a lot of headaches.
    Jake Gulick


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  4. 03-14-2007, 02:58 PM #4
    mccletus
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    Doh, I completely missed/skipped over that line. Welp, I'm an idiot. Thanks.
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  5. 03-26-2007, 09:12 PM #5
    kbailey
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    I've been curious about this mod...anyone know the HP gain?
    Kevin Bailey
    ITA/IT7 WDCR

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  6. 03-26-2007, 09:45 PM #6
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    Speed Raycer
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    Don't know the HP gain but the coolant/water loss during a manifold swap is nil!

    On a down side, every motor I've done this too has gone in the crapper by shear coincidence
    Scott Rhea
    Izzy's Custom Cages
    It's not what you build... It's how you build it
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  7. 03-27-2007, 09:48 AM #7
    johnny yanez
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    on the other hand,, i have plugged the intake water passages on every one of my rotary mazda since the early 80s and rx3, rx7 12A motors, never had a problem with the motors. raced rotary for about 20yrs.
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  8. 04-04-2007, 09:03 PM #8
    miketrier
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    Keeping coolant out of thi intake keeps the carb and fuel cooler (less hot) and seems to help performance. I can't say by how much, however.
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  9. 04-06-2007, 11:28 AM #9
    Hahn63
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    It might keep the manifold cooler since it is getting baked by the exhaust. You know a special manifold cooler!

    Roland
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  10. 04-06-2007, 01:52 PM #10
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    Speed Raycer
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    It might keep the manifold cooler since it is getting baked by the exhaust. You know a special manifold cooler!

    Roland
    [/b]
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    Scott Rhea
    Izzy's Custom Cages
    It's not what you build... It's how you build it
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  11. 04-06-2007, 02:21 PM #11
    Hahn63
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    Scott ,I hope you know I was joking.....or was I?

    Or maybe we need a exhaust radiator!? Now what would that look like?

    Roland
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