Shaft angle for old inboard project

Discussion in 'Inboards' started by Luchog, Dec 6, 2005.

  1. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    I grew up in Montevideo and did a fair amount of cruising in the Uruguay and Parana.
     
  2. Luchog
    Joined: Dec 2005
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    Location: Rosario, Argentina

    Luchog Junior Member

    I have talked to many people on this topic and I'm handling the possibility of doing a rear engine install with a V-drive unit to avoid cardanic transmission and possible issues there.
    Since this will require a wider shaft angle it will help lift the stern to handle engine/transmission weight (800lbs aprox).
    I'm looking for a Velvet V-drive 71c, but I can get a good deal on a new Paragon V-drive, any suggestions?
     
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    As long as it is rated for the HP there is no major difference.
     
  4. dsharp
    Joined: Jan 2006
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    Location: Freeport, texas

    dsharp Junior Member

    Before you buy the 1.5 Paragon v-drive you need to make sure you can get the bigger prop under the boat unless you're planning on changing the strut. If you decide to go straight inboard- engine placement is often dictated by the depth of the oil pan and bellhousing with respect to the crankshaft centerline. You should be able to get the dimensions from the manufacturer. They're all about the same for the small block chevy's. You can always move your fuel tank or have a tank built to mount across the stern up against the transom if you're worried about being bow heavy. I don't remember the weight on the paragon v-drives but they are heavy as hell. I personally don't care for v-drives. As a mechanic it's hell to re-pack and check the stuffing box. I like to keep my eye on the stuffing box. If you're going to leave the boat on a trailer it won't be that big of a deal though. I've seen my dad do this type of conversion about 10 times. He would lay 2 sheets of plywood down in the shop and draw out the bottom of the boat to figure out the struts, shaftlog placement and dimensions. I should have paid more attention.
     
  5. Luchog
    Joined: Dec 2005
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    Location: Rosario, Argentina

    Luchog Junior Member

    It has been a tough choice, but I have decided to do a direct drive install, wich is easier and cheaper, next month we'll start re-doing the stringers, then we'll place the engine and calculate space for the propeller since I have a 1:1 Velvet Drive, wich I might change to 1:1.23 or 1:1.5 but not sure about this yet.
    Fuel thank would be located on the stern against the transom 150lts aprox, and batteries somewhere in the bilge to compesate some weight where needed
    this boat is meant to move some weight since this is a wakeboard boat project.
    any comments are appreciated
     
  6. The Island Man
    Joined: Aug 2005
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    Location: Parksville British Columbia

    The Island Man New Member

    Transmission Ratios

    Hi
    I'm just wondering if you can turn the motor one revolution and the prop two revolutions is that what you mean when you say 1: 1:23 is that like 1 & 1/4 revolutions ? When I heard like a 1.5 to 1 or 2.5 to 1 I always thought the motor was turning more that the prop ? I never heard of it in the reverse ?
     

  7. Luchog
    Joined: Dec 2005
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    Location: Rosario, Argentina

    Luchog Junior Member

    Well, this project has been dead for months now, I've been to busy with work and getting the money needed for the overhaul process.
    I still have the Velvet 1:1, I have a buyer for it and my idea was to sell it and get a PCM 1.23:1 8ยบ drive.

    Now I have found out about Walter direct-mounted V-drives, and was wondering if it might not be better to keep the Borgwarner Tranny and add it a Walter V-drive, but I can't find any princing for them. Does anyone know where can I get pricing for them?
     
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