transom angle

Discussion in 'Boat Design' started by noclue, Nov 15, 2022.

  1. noclue
    Joined: Nov 2022
    Posts: 2
    Likes: 0, Points: 1
    Location: us

    noclue New Member

    I am trying to swap a 1994 4.3 mercruiser into a 1974 sea ray with a 10 degree transom angle but the donor boat had a 15 degree transom.
    do I have to change the angle of my transom to 15 degrees?
    when I try to mount it to the 10 degree transom it seems to be binding the transom plate to engine bushings too much
     
  2. baeckmo
    Joined: Jun 2009
    Posts: 1,654
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    Location: Sweden

    baeckmo Hydrodynamics

    The nominal transom angle for Merc:s is 13 degrees, meaning that this is the angle between the transom and the flywheel plane. If you reduce the angle to ten degrees, the engine shaft has to be angled down three degrees forward. The consequence is that there must be room to lower the fw engine mounts correspondingly.

    Your observation re binding is proof of the pudding.
     
    DogCavalry and fallguy like this.
  3. noclue
    Joined: Nov 2022
    Posts: 2
    Likes: 0, Points: 1
    Location: us

    noclue New Member

    Thank you!
    I wasn’t sure about the donor boat angle it’s long gone now.
    I was just about to try lowering the front.
    Good to know that it should be 13 Degrees, very doable now!
     
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