valve cover breathers

Discussion in 'Engine Topic' started by giggity, May 4, 2016.

  1. 80sz

    80sz Veteran Member

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    Thx copo!
     
  2. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    Damn, that is a cool project. I'm too lazy, I just bought a small vented can.


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  3. giggity

    giggity Veteran Member

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    so your not using valve cover breathers at all, just a catch can with PVC?
     
  4. COPO

    COPO Veteran Member Lifetime Gold Member

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    Yes, plus I have the factory hose from the pass side cover to the air cleaner and the PCV is hollow with a small orifice.

    [​IMG]

    [​IMG]
     
    Last edited: May 6, 2016
  5. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    So instead of using a pump or header to create negative air, you used the pistons.
    The steel wool blocks the mist, so you are still clearing the block of a little contamination and pressure from blow by!!!!

    Again, excellent project, very smart way to fix one issue, without causing another!!!!!


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  6. giggity

    giggity Veteran Member

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    Isnt that big tube from your valve cover to your air cleaner essentially a breather?
     
  7. COPO

    COPO Veteran Member Lifetime Gold Member

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    I guess. All it has in the breather is a flame arrestor plus the baffle in the cover on both sides.
    [​IMG]
     
  8. mrdragster1970

    mrdragster1970 Veteran Member Lifetime Gold Member

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    I'm assuming you don't run a gauge????
    It might be a good test to run a sealed system.
    It would help keep the windage down.

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  9. Orange71

    Orange71 Veteran Member Lifetime Gold Member

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    Where did you get the hollow PCV valve?
     
  10. COPO

    COPO Veteran Member Lifetime Gold Member

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    GM used to sell lots for the trucks that were consuming oil, then someone told them to stop selling them.

    Search on GM's part number 12572717 fixed orifice PVC valve.
    http://www.gilfether.com/low-manifold-vacuum-pcv-for-chevrolet/428/

    Here are the P/N's for the fixed orifice PCV valve -
    - ACDelco #CV948C,
    - AC Delco #12572717.
    GM no longer stocks the PCV valve.

    Substitute for GM 12572717 fixed orifice PCV valve
    BWD PCV484
    FRAM FV410
    WELLS PCV371
    DEFENSE FV410
    AIRTEX 6P1241
    CARQUEST 76-2698 in Canada

    http://www.nastyz28.com/forum/showthread.php?t=296555
     

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