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  1. #1
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    Screw outboards, I want a Cummins

    I've been driving a Cummins pickup for over 30 years now,

    They don't break down, and for the price of outboards now.

    I want a Cummins, and I'm sure they can twist a tall prop with ease. Torque monsters, I'm hooked on torque

    High HP is cool on a motorcycle, my red line is 10,500, but it doesn't really come on till 6,000 rpm, which is cool for a

    race motor but not a heavy boat, but in the water with high drag, give me a motor that spins 1,600 RPM and makes

    serious power, oil changes at 15,000 miles on the road, that's crazy good.

    Does anyone know the price of a mercury 6.7 full set up?


    https://www.mercurymarine.com/us/en/...ry-diesel-6-7l




    That new 52 ft Kraken would get much better fuel mileage with two Cummins than 48 cylinders of gas.

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  3. #2
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    I love my 480 Cummins in my 390 Sea Ray Motoryacht.

  4. #3
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    That's a sweet ride, I've seen older Express Cruisers but those Motoryachts are rare,

    Have you done any trips?

    I would like a large condo on the water someday.

  5. #4
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    Those are impressive power numbers for an engine that is going to see the duty cycle that a marine environment places on an engine.. EG sustained high load situations.. For the high GVW commercial type on road applications they detune the engines quite a bit... I guess in the water there is near endless cooling ability available given a large enough heat exchanger.

  6. #5
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    I didn't know Mercury had a diesel offering,

    I'm looking at a 39 Sea Ray EC 1985 that I can get for free by removing the present running gear.

    So I was thinking diesel, but the 39 has prop tunnels so It has a shallower draft,

    I have an aluminum 30inch swim platform motor mount so I guess outboards will be an easy repower

    These boats are 14 ft wide and normally cruise in the low twenties, with tops in the low 30's so a step above a trawler

    So I have two low-hour 250XS 25-inch motors that are sitting in my garage for ten years

    So I hope to start there, but I'm not sure what to do with all the space from the large engine compartment ... dreams.

    I've always wanted a condo on the water, speed is not important.

  7. #6
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    I loved my 390EC, outboard repower would be cool and the space would be crazy!
    TJ @ Baker Engineering
    Tuff 24 300xs
    Tuff 16 90 Yammie
    3.75@199mph with LSX power!!!

  8. #7
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    How about a Mercury Diesel outboard?

    Click image for larger version. 

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    Last edited by skialot2; 03-11-2024 at 12:17 PM.

  9. #8
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    it is too cheap and simple to buy from someone upgrading, like 400 Veraldos I saw a
    pair for $15,000. I bet 400hp outboards will run a lot better than the 454 CI motors that are coming out, transmission, shafts, and big props, It will be a lot lighter with outboards, one guy said I could run in some shallow water if I didn't fill the prop tunnels and set the outboards behind so they would get a clean flow, that will be an experiment.

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  11. #9
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    You cannot beat those Cummins diesels. They push my Sea Ray Motoryacht with ease.

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