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Thread: Rude 300 prop

  1. #1
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    Rude 300 prop

    I recently purchased a 20' Concord Mach II with a 300 HP Evinrude. The boat was sold without a propeller and I was told to purchase a 14.5 x28p. After taking the boat on the lake I feel this prop is wrong for the boat and need some suggestions/help. Here are the problems I experienced and my current set up:

    Problems:
    WOT only 4000 RPM (untrimmed)
    Motor bogs down and dies when pulling skier out of the hole
    When the boat reaches plane the propeller slips and cavitates. This causes a loss of acceleration and plane


    Setup:
    Evinrude 300 (dyno at 360)
    10.5" setback on jackplate
    Motor and jack plate in highest position
    28p Raker 3-blade propeller
    20' Concord Mach II

    One other thing I have a question about is the rpm at idle and when put into gear. The engine idles in N between 1200-1500rpms. When shifted into gear rpms drop to 600-800 and the engine struggles to keep running if you do not feed it gas. To me it seem the engine idles fast in neutral and slow when in gear. I would like to adjust the engine to idle around 1000 when in N and in drive. Would this be ok or is there a reason for the difference in rpms?

    Thanks for the help.

    Jarratt

  2. #2
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    i have a 22 foot with a 300 rude and i have a 28 raker and they are bad out of the hore to ski i would go to 23 or 25 just to ski with i can pull a skirer with a 25 chopper
    Adrenaline junkie for life

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    is yours a 3.6 liter or 4.0 ???
    Adrenaline junkie for life

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    It is a 91'. 3.6 liter I think.

  5. #5
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    the 3.6 has lees bottom power revs more i would run a lower pitch for ski and biger for top end the raker doesnt work well on my boat i would try a over the hub prop not through how heavy is your hull ???
    Adrenaline junkie for life

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    1200 lbs.

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