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  1. #1

    Riva Dyno Testing

    hope jerry doesn't edit my link lol
    http://rivaforums.com/groupee/forums...4/m/3871080771

    Looks like it shows the A/F ratio and they seem pretty safe.
    I know we had a previous thread about the engine running lean with the various stages.

    I wonder how much lower the waterbox mod makes it.

    What would be a damaging A/F reading less than 11 ?


  2. #2
    Site Admin Green Hulk's Avatar
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    The waterbox mod does absolutely nothing for you until you port the head.
    I noticed no difference with my basically stock ski when i did the waterbox mod. Sounds good though

  3. #3
    Was your air filter customized then.
    Wouldn't more air flow in need more air flow out ?
    and doesn't the modded waterbox provide that ?

  4. #4
    Site Admin Green Hulk's Avatar
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    I was running the Riva air intake at the time I modded my waterbox. I felt no difference in acceleration and I gained nothing on GPS.

    I think the stock waterbox is perfectly capable of handling up to 8100 RPM's. When you start slinging your prop at 8400+ RPM's then you want to open it up.

  5. #5
    JFizzleJR's Avatar
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    MIKE AND FRANK-
    IT IS OCTOBER
    IS THE 300 HP READY YET ?

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