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  1. #1

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    Side draft manifold.

    What are the pros and cons to using a side draft manifold on a 97 gp12?


  2. #2
    Moderator OsideBill's Avatar
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    Here is a Post from several months ago you will need to go through all of it at the end TJ Race has some pointers I believe from what I have read that it is an improvement cons are possible water ingestion I have never tried it so hopefully someone will jump in and help.


    http://www.greenhulk.net/yama/showth...draft+manifold
    OsideBill

  3. #3
    Flying Scotsman's Avatar
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    Just do it I wish I had.

    No downside

    Upside is more low end and midrange pull.

    SCOTT...............

  4. #4
    ....back from the dead.... J-ME's Avatar
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    You are very wrong Scott, there are many downsides with water ingestion being one of them.

  5. #5
    Flying Scotsman's Avatar
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    I have no water in my hull so its no problem.

    If I did I would find out why and keep the water out.

    SCOTT............

  6. #6
    Flying Scotsman's Avatar
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    I agree with J-ME if you dont have a dry hull then dont do it.
    SCOTT.............

  7. #7
    Moderator OsideBill's Avatar
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    What are the things to look for as far as generic water leaks in the GP Hull? I had the ride plate insert problem and suspect the previous owners repair contributed to water leaking there. But my hull always has a couple inches in it. What are the tips and tricks here?

    OsideBill

  8. #8
    Hydrotoys's Avatar
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    On of the BEST things to try is this.

    In a dry driveway, put your drain plugs in, pull your seat, and fill your ski up about 6-12" of water. Make sure that you do not get any in your carbs or engine.

    Crawl underneath for about 15 minutes, and start looking around. You might just be surprised...or not.

  9. #9
    ....back from the dead.... J-ME's Avatar
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    The seat seal is the biggest culprit on the GP, the front storage lid is a close second.

    The shortie ("sidedraft") style intake manifold provides quicker throttle response but moves the torque peak up the rpm band. Not exactly where I would want it.

    Works best with triple pipes,IMHO.

  10. #10
    Duke's Avatar
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    There is a noticable power increase throughout, on single
    or tripples. The down side is the water injestion potential.
    I believe Riva made a splash shield at one time.

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