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Thread: 18 Needs New Engine & Drive - Any Ideas?

  1. #1
    Join Date
    Aug 2015
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    18 Needs New Engine & Drive - Any Ideas?

    We already knew the outdrive had to change before it becomes hard to find parts for it. Also since it's original, their is no trimming up the drive which we would like to have. Any ideas for what kind of outdrive to replace it with? We were thinking of a Volvo Penta Duo-Prop system because it might be easier to make the switch from what we currently have. Or should we go the Mercury route?

    Keep in mind that we are skiers so we do want to get out of the whole fast but at the same time want to have that top end for when we want to go fast.


    Thanks in advance,
    Jamie W

    1990 Sweet 16 and 1976 X-18

    Converse Bay on Lake Champlain

  2. #2
    Join Date
    Dec 2004
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    Check prop pricing before you make any decision . Volvo d/p props can cost more then some boats.
    A winner is just a loser that got up and did it one more time.
    1959 Biesemeyer - 4pt Hydro Drag - 2013 ACBS Winner - Best Race Boat
    1967 Nova Marine - SuperNova24 - ACBS Winner - 2012 Best Race Boat - 2016 Peoples Choice & Best Non Wood
    1972 John Allmand - Nova 19
    1982 PolarKraft -Jonboat - Crab Killer

  3. #3
    Join Date
    May 2001
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    Are you interested in a total resto ? If not then there is a 280 t for sale in the parts section bolt the drive up and get the rest of the season out of it then add the trim pump later. Or pull the motor glass in the transom and cut a new hole for a new Volvo or merc
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  4. #4
    Join Date
    Mar 2005
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    The Volvo Duo-Prop is a very nice set up, and the counter-rotating props provide for a very stable ride. They are also very expensive. I don't know if any of the current outdrives will be able to use the existing transom cut out. It is most likely that you will need to redo the transom and cut a fresh hole for whatever drive you choose.

    If money was not an issue, I believe I would go Volvo Duo-Prop.
    “Oh right, because you walked into strippers discount warehouse and said ‘Help me showcase my intellect.’” - Archer

    Grand Rapids, Michigan
    1985 Donzi Criterion SS
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  5. #5
    Join Date
    May 2003
    Rep Power
    Just my .02c , but Bill is right about the transom cutout part. One thing is certain though . If you now have vintage Volvo stuff and do a 'modern' re-power then you'll have to have the old transom cut out filled and re-done.
    All of the new stuff , Volvo included , now utilizes the Merc pattern hole.

    Also , I did a complete re-power on mine in 2007 from old Ford Merc Alpha to GM Volvo DPS-a . I tried the single prop SX-a first but the boat was virtually undriveable .
    The DPS-a switch over was unbelievable . And if you want serious punch at all speeds you're gonna get it in spades. I think that in a package format the DP units are only a couple of hundred more than the single prop unit package.
    Expect to pay about $1400 for a propset though .
    Just because something's old doesn't mean you throw it away !

  6. #6
    Join Date
    Jul 2004
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    Quote Originally Posted by speed demon View Post
    We were thinking of a Volvo Penta Duo-Prop system because it might be easier to make the switch from what we currently have.
    Just for you:
    Why is faster never fast enough.

  7. #7
    Join Date
    Feb 2005
    Rep Power
    If it was mine I'd go with the 280 as suggested by Mattyboy Bolt on and go is always the better option in my book. What engine is in it now? What's wrong with the motor in it now that it needs a new one?
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish

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