GT40 Ski Nautique with Carbon Fiber Mods

Discussion in 'Inboards' started by SharkFM, Oct 3, 2010.

  1. SharkFM
    Joined: Oct 2010
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Canada

    SharkFM New Member

    I have a 97 Ski Nautique with the 310 HP GT40. I stripped it and replaced the platform, floor panel(s), motor box and seats with Carbon fiber, reducing weight to about 2000 lbs (stock is 2400 lbs). The boat is smokin' fast.

    Got a new CNC ACME 422 4 blade on it, and for 34 MPH I rev at 3330 rpm.
    WOT i rev at 5100 rpm speed over 76 km/h ~47 mph.

    422 12.50 15.50 .105 cup 4 1" RH

    Should I have gone with this one???
    668 12.50 15.50 .150 cup 4 1" RH

    I think i need to see the torque curve of the motor.
     
  2. powerabout
    Joined: Nov 2007
    Posts: 2,913
    Likes: 63, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    you want to make a mid mount ski boat go fast???
    take the engine out and put it into something else
     
  3. SharkFM
    Joined: Oct 2010
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Canada

    SharkFM New Member

    Reduce the wake for slalom and increase efficiency
     
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