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    2850 diesel conversion-gctid378232

    Wonder how this diesel conversion worked out?

    http://www.yachtworld.com/boats/1986.../United-States

    From the limited pictures the installation looks neat.

    Wonder how the overall gear reduction was achieved? Can VP drives gear ratio be adapted to the limited 2400 - 2500 rpm of Cummins B 5.9. The top speed seems low for a 200 hp engine with 700 lbs of torque...
    Rod
    1991 4387
    Sidney, BC

    #2
    Not a very clean/neat conversion, if I say so.
    Tony, Cape Cod, MA
    Vice Commodore Bourne Yacht Club
    1994 Carver 390 Cockpit Motor Yacht
    454 Merc Cruisers inboards
    "HOLODECK"
    2014 10' hard bottomed Dink powered by 3.3HP Mariner 2 stroke
    www.bourneyachtclub.com

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      #3
      Roddy wrote:
      ........ Wonder how the overall gear reduction was achieved? Can VP drives gear ratio be adapted to the limited 2400 - 2500 rpm of Cummins B 5.9. The top speed seems low for a 200 hp engine with 700 lbs of torque...
      They used the 280/275 transom shield, so I'm not sure that the C or later drive could have been used.

      The DP-E (diesel drive) is one drive that offers two upper unit ratios (different gear set), which allows for the 1.95:1 lower to be used, and come up with close to 2.30:1 over-all reduction. With the 1.78:1 lower, there would be another blended ratio available.

      But with that much torque, I'd bet that they used the standard 1.78:1 ratio.
      Rick E. Gresham, Oregon
      2850 Bounty Sedan Flybridge model
      Twin 280 HP 5.7's w/ Closed Cooling
      Volvo Penta DuoProp Drives
      Kohler 4 CZ Gen Set

      Comment


        #4
        2850Bounty wrote:
        They used the 280/275 transom shield, so I'm not sure that the C or later drive could have been used.

        The DP-E (diesel drive) is one drive that offers two upper unit ratios (different gear set), which allows for the 1.95:1 lower to be used, and come up with close to 2.30:1 over-all reduction. With the 1.78:1 lower, there would be another blended ratio available.

        But with that much torque, I'd bet that they used the standard 1.78:1 ratio.
        So the 2500 rpm is not a show stopper in this conversion?

        I was queering the 20 top speed and 18 cruising speed are a result of too much gear reduction as the drives are designed for 3900 rpm VP diesels and 5000 rpm gas engines.

        If wasn't for the 3000 miles, I would take look at this 2850...

        Diesel is getting very attractive in BC with diesel hovering around $6.40 gallon and mid-grade gas at $6.00 gallon...
        Rod
        1991 4387
        Sidney, BC

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