Your Intake Manifold and You

Discussion in 'Mazdaspeed 3/6 Engine' started by AYOUSTIN, Mar 5, 2016.

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  1. AYOUSTIN

    AYOUSTIN Silver Member

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    Interesting. Where'd you find that out?
     
  2. Enki

    Enki Motorhead Platinum Member

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    When I made that statement earlier I had looked at the throttle body rubber gasket thing and found this:
    IMAG0545.jpg

    Kind of a shit picture but shows why I would think that.
    Unfortunately, now that I've checked the head side, I can't find any markings that match this one, so either it's a defect or damage (this is a used manifold) or I'm half right.
     
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  3. John

    John Full Fledged Member Gold Member

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    The flash and parting line mismatch tell me this gasket was molded as one piece, not extruded or something. I'm not sure what the cross-gasket grooves are because potato. If I had to guess, the groove the gasket goes into has some pointy ribs in it to help retain the gasket in the groove before the parts are assembled, and being in it over time has caused those. Or maybe the gasket was across parting lines in the parts or something. Also if you inspect the gasket for the gate locations, you might find it's the knitline opposite the gate. That's the last area to fill, and if molding parameters aren't optimized for that shot it would be the first sign.
     
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  4. Redline

    Redline The Notorious One Gold Member

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    Yeah, those lines convey injection molding to me too. I still think that with the correct profile of gasket material that a cut/glue and mount with RTV approach would hold boost just fine, so long as the correct materials/sealant are used.
     
  5. John

    John Full Fledged Member Gold Member

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    I think it could perhaps be made to work, or a multiple O-ring approach be made to work, but just using the stock gasket is cheap and easy enough. But sometimes I just can't resist doing overly demanding asian father. LOL
     
  6. Redline

    Redline The Notorious One Gold Member

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    Stock gaskets are perfect for IM to adapter plate. I'm thinking about the adapter plate to head connection. Is that what you're referring to?
     
  7. John

    John Full Fledged Member Gold Member

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    IM to adapter plate is with the stock FoST manifold gasket. When I say stock gasket I mean the stock 'speed mani-to-head gasket, which it sounds like is the plan for the adapter plate to head (Austin 3:46)
     
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  8. Becauz_Racecar12

    Becauz_Racecar12 Greenie N00B Member

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    Great write-up! Definitely thinking of modifying my intake mani to single runner now!
     
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