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  1. #1
    Petty Officer 3rd Class WhereBob's Avatar
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    Apr 2004
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    Lincoln, NE
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    81

    Default Mods to a 3.0 140 hp mercruiser to pull a skier?

    What can I do to a 3.0 140 hp mercruiser inboard to get more power or torque to lift a slalom skier out of the water?

    Thanks

  2. #2
    Honorary Moderator Emeritus Don S's Avatar
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    Aug 2004
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    Default Re: Mods to a 3.0 140 hp mercruiser to pull a skier?

    Either a bigger engine, or under-prop it so you get more low end, but less top end speed.
    The prop forum would be the best place to post your prop size question.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  3. #3

    Default Re: Mods to a 3.0 140 hp mercruiser to pull a skier?

    My 18' works just fine for pulling folks up and out of the water, I run a 14.5x19 Solas Rubex prop.

    The performance upgrade thought I too got early on was soon shattered by the fact that there's nothing out there. Nothing short of a cam, port / polish the heads, over bore the cylinders. At that point, you're looking at spending more than it's worth for the meager gains you would get out of our little 4 bangers.

    One of the big errors we make is thinking in terms of a car, the power band in a boat is totally different. From what I see it's much flatter in a boat than a car and a boat motor is meant to be run wide open if you want to go fast. Forget torque figures and realize it's all about how many horses you can crank out. For us, it's pretty much 140 and that's it.

  4. #4
    Petty Officer 2nd Class
    Join Date
    Aug 2008
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    Dallas, TX
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    179

    Default Re: Mods to a 3.0 140 hp mercruiser to pull a skier?

    ^^^^^Don't forget however,

    In a boat, just like a vehicle - "torque" is what gets you moving. HP determines how fast that movement will be....


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