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2556 repower 383 stroker with Bravo 3

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    2556 repower 383 stroker with Bravo 3

    I have just completed a complete repower of my 1990 2556. I replaced the 454 Bravo 2 with a mercruiser 383 mag Seacore, Seacore transom assy and Bravo 3 out drive. Also added Merc Eco gauges.

    Net results were an improvement in every category.

    Planning

    Top speed

    Economy

    This package out performs the 454 in every way.

    I run a heavy loaded boat as well.

    #2
    Welcome and thanks for sharing, got any pictures to post of the project?
    1997 Maxum 2400 SCR 5.7LX Bravo II

    Mike

    Comment


      #3
      Welcome to BOC.

      Glad to hear the results were all positive. I have always thought what you would lose is torque would be made up with the weight reduction.
      Phil, Vicky, Ashleigh & Sydney
      1998 3055 Ciera
      (yes, a 1998)
      Previous boat: 1993 3055
      Dream boat: 70' Azimut or Astondoa 72
      Sea Doo XP
      Sea Doo GTI SE
      Life is short. Boats are cool.
      The family that plays together stays together.
      Vice Commodore: Bellevue Yacht Club

      Comment


        #4
        "Nauti Mike" post=761155 wrote:
        Welcome and thanks for sharing, got any pictures to post of the project?
        Yea, we want pics :P
        Dave
        Edmonds, WA
        "THE FIX"
        '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
        (.030 over-Vortec top end-part closed cooled)
        The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
        Misc. projects thread
        https://www.baylinerownersclub.org/f...56-gctid789773

        Comment


          #5
          Would like to find out what props your running

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            #6
            who built the motor, or was it a crate engine or short block?.... I would be interested in seeing the build specs on the engine.
            and im interested in what the boat weighs and what prop you are running as well...
            im in the process of putting a 383 together and hope to see a big improvement as well, but I will be comparing the performance of the 383 against my current 5.7.... which should be a much bigger jump than you seen against your old 454.... ;-)


            NU LIBERTE'
            Salem, OR

            1989 Bayliner 2556 Convertible
            5.7 OMC Cobra - 15.5x11 prop
            N2K equipped throughout..
            2014 Ram 3500 crew cab, 6.7 Cummins
            2007 M-3705 SLC weekend warrior, 5th wheel
            '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
            Heavy Equipment Repair and Specialty Welding

            Comment


              #7
              It would have been nice to get those details. The thread is about 2 years old and OP's avatar & username suggest he's no longer with us
              Dave
              Edmonds, WA
              "THE FIX"
              '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
              (.030 over-Vortec top end-part closed cooled)
              The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
              Misc. projects thread
              https://www.baylinerownersclub.org/f...56-gctid789773

              Comment


                #8
                I am currently running 3x3 22p props in my 90 2556. Not sure of the weight. Full fuel camping gear 4 people and a dog. I also have a kicker motor and a dingy with a motor. And full fiberglass cockpit cover... so pretty heavy lol. With the current set up I am able to get out of hole without trim and up to a top end of 30k. But I’m only getting 3800 rpm wot. I should be in the 4600 to 5000 range. I have about 10 hrs on the motor and so far... I love the 383.

                Comment


                  #9
                  The motor is a merc 383 mag mpi

                  Comment


                    #10
                    Can you get to the top end of the RPM range at the dock? If yes, you're likely over-propped (or bottom is very dirty causing drag). If you can't get to the max RPM range at the dock, you have some other things going on that require investigation (fuel, injectors dirty etc....).
                    Terry
                    1999 Bayliner 3388
                    Twin Cummins 4BTA
                    Fisherman, Cruiser, Boaticus-enthusiasticus-maximus
                    Member Royal Victoria Yacht Club

                    Comment


                      #11
                      383 should easily hit 4800 if not 5000. What’s the drive ratio?
                      Dave
                      Edmonds, WA
                      "THE FIX"
                      '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
                      (.030 over-Vortec top end-part closed cooled)
                      The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
                      Misc. projects thread
                      https://www.baylinerownersclub.org/f...56-gctid789773

                      Comment


                        #12
                        I would really like to see all your data before swallowing what you're dishing up here.

                        Comment


                          #13
                          I ordered Hill marine 4x4 props 18” pitch, so hopefully that will increase my wot rpm to 5000. At the dock I can get 5200. As far as the motor goes it runs great. I replaced the original 454 with the 383 and never repropped so I’m hoping this will fix the issue.
                          Im not sure of the drive ratio. It’s a 97 b3.

                          Comment


                            #14
                            If you dont get that rpm up, you will quickly damage the engine... because its lugging hard..
                            once you are propped correctly and get the operating range necessary for the engine to work as it should, THEN you can run at any rpm without worry...


                            NU LIBERTE'
                            Salem, OR

                            1989 Bayliner 2556 Convertible
                            5.7 OMC Cobra - 15.5x11 prop
                            N2K equipped throughout..
                            2014 Ram 3500 crew cab, 6.7 Cummins
                            2007 M-3705 SLC weekend warrior, 5th wheel
                            '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
                            Heavy Equipment Repair and Specialty Welding

                            Comment


                              #15
                              The motor is a factory repower package. The internals are more from the racing side for more durability and performance than the 350 MAG. The use all forged internals. They don’t publish much on specs other than 350 hp 425 ft lbs of torque.

                              The boat is very heavy. According to the Edmonds launch scales it weighs 8600 lbs fully loaded.

                              I run a 21 pitch Bravo three prop set 4 x 3 I turn up 5000 rpm wot and max speed I have seen is 42 mph. I cruise at 3800 rpm 26 mph at 1.7 mpg. 3800 to 4000 is the sweet spot for peformance and economy. I have tried a hill marine set of 22 pitch and they flat out sucked so bad I returned them.









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