mounting outboard to inboard/outboard

Discussion in 'Powerboats' started by pcromien, Mar 5, 2006.

  1. pcromien
    Joined: Mar 2006
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    pcromien New Member

    I would like to mount a 90-125 horse 4 stroke to a hull that currently has a 4 cylinder volvo i/o, the boat is a 21 foot double eagle. where would I find the brackets to hold the weight of the new outboard, or do I just weld up my own and mount:?: ? any idea of the cost or any special problems I may encounter?
     
    Last edited: Mar 7, 2006
  2. tlmopsman
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    tlmopsman New Member

    DandDMarine have a good website. I'm also in the process of figuring out how to do this with a 20' hydroswift cuddy.
     
  3. pcromien
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    pcromien New Member

    mounting bracket for outboard conversion


    any luck finding material on what is involved in converting to outboard with a bracket?

    Paul
     
  4. dereksireci
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    dereksireci Senior Member

  5. pcromien
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    pcromien New Member

    thanks a bunch, I will investigate the links you suggested. It definately gives me more to go on.
    Paul
     
  6. LEASEGUY
    Joined: Jul 2006
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    LEASEGUY Junior Member

    brackets

    google outboard brackets, gill makes many bolt on brackets that include flotation . your transom is probably very strong if it currenty has an i/o but check the intergrity of the wood when you remove the intermediate housing.
     
  7. funkyblues76
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    Location: Archdale, North Carolina

    funkyblues76 Junior Member

    What's the best way to remove/fill hole in transform from previous ib/ob?
    Thanks!
     
  8. LEASEGUY
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    LEASEGUY Junior Member

    When you remove your I/O make sure your transom isnt rotted, i made a template to form a wooden plug several layers thick to match transom thickness. I glassed the plug to seal it and glassed it a second time as i postioned the plug in the transom. When it setup i glassed it inside and out to a smooth finish,then used boat life as a bonding agent and i sandwiched the whole deal with 1/4 aluminum plate in and out, bolted the plates together with stainless bolts right through the transom. still solid after 17 years .
    My plates were about 2 feet high by 18 inches wide( from rub rail to just above the plug) very solid. You might do with less but all your horse power is pushing rigt on that spot. The switch to ob from I/O dropped 300lbs off the back of the boat and moving the prop back a bit which decreased draft by 9 inches. Really worth doing.
     
  9. funkyblues76
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    Location: Archdale, North Carolina

    funkyblues76 Junior Member

    Thanks! Do you have any pictures? How did you attach new motor?
    Thanks Again!
     
  10. LEASEGUY
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    LEASEGUY Junior Member

    Sorry no pics in progress. the bracket that the motor goes on has 6 bolt holes.
    The technical aspect is height and ride position,you likely have less wieght back there now and your draft will be shallower, make adjustments before you start drilling holes.
     
  11. charmc
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    charmc Senior Member

  12. Jim Williams
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    Jim Williams Junior Member

  13. charmc
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    charmc Senior Member

    Jim,

    While the "Cap'n D" article I cited uses wood plugs, resin and FG only, it looks like you are using a similar method with the addition of metal fish plates inside and out. This will add considerably to the strength of the repair, and I think it's a good idea. Being conservative about reinforcing a transom can only be good. Some transoms are built with a wood core, and moisture leaks from the I/O through hull opening can weaken the core in ways that can't be seen. Add that to the fact that the boat was designed and constructed with the weight of the I/O drive train all on the stringers, and now it will all be on the transom. It would seem that extra reinforcement is a good investment. Aluminum plate should be OK, but you'll need to make it thick enough to give the same strength as stainless. It should still cost less, and it's a lot easier to work with. Leaseguy's results, 17 years of service, "reinforce" (sorry 'bout that) the point.
     
  14. Jim Williams
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    Jim Williams Junior Member

    Sorry LEASEGUY, I was intending to point funkyblues76 to my thread.
     

  15. funkyblues76
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    funkyblues76 Junior Member

    Jim, thanks for the info. Let me know how the bracket/engine instalation goes.

    Thanks
     
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