volvo 280

Discussion in 'Sterndrives' started by capbodine, Aug 7, 2012.

  1. capbodine
    Joined: Aug 2012
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    Location: los osos,ca. usa

    capbodine New Member

    Hello, this is my first post so bear with me. I have a 20ft. searay that had a 302 ford omc out drive. the omc is history and I would like to take the 4.3 volvo 280 combo that i have out of a donor boat and mate the drive unit with the 302 and install it in the searay. can anyone tell me the parts needed? I am aware of the transom mods, that is the easy part for me. I assume that different manifolds will be required and would like advice on that subject as well, as to after market or factory.The biggest question would be the mating of the engine to the 280 Volvo drive. Thanks in advance.
     
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    You need to change the gears to 1.65:1 ratio to start with. It may be possible to put a really low pitch propeller, but won't be very efficient.
     
  3. capbodine
    Joined: Aug 2012
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    Location: los osos,ca. usa

    capbodine New Member

    Thanks Gonzo, is there a easy to tell what ratio it has now?and what about bell housing?
     
  4. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    The easiest way is to turn the input shaft and count how many turns it takes to make the prop shaft do one turn.
     
  5. whitepointer23

    whitepointer23 Previous Member

    why not use the v6, you can make it the same horsepower as the 302. if your 302 is a 2 barrel carb the v6 will be pretty close to the same output anyway. 4.3 parts are much easier to get than 302 marine parts. and cheaper.
     
  6. tuantom
    Joined: Jan 2005
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    Location: Chicago

    tuantom Senior Member

    My 280 has a 1.61 stamped into it, either under the zinc or right where the shaft enters the unit.
    I agree about keeping it simple by using the 4.3, but a bell housing from any year pre-sx small block ford should work. eBay probably has some listed.
    Osco,Barr and others still make exhaust manifolds kits that'll work for the ford.
     

  7. capbodine
    Joined: Aug 2012
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    Location: los osos,ca. usa

    capbodine New Member

    Ok back to the project, I now know that it is a 3.8 not a 4.3 and the out drive is a 280T model that has power trim. I also know that it has the 6 cylinder final drive ratio and my question is what is the best path to proceed in changing that, order new parts, take the lower unit to a shop or search for used replacement?
     
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