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    2556 Propeller-gctid818092

    My 2556 w/ 350 MAG MPI Horizon (supposedly 300 hp) had a 17-3/4" diameter 21" pitch aluminum prop on it when I bought it, which based on my research seems to be standard for the Bravo 2 outdrive on the 2556. It had small chips at the edges, and I noticed what looked like weld seams where it had been repaired before. After the last outing (where the outdrive wouldn't come up), either it hit something or one one of the welded repairs gave out because the chips on one blade were substantially bigger.

    I'm hesitant to repair the prop again since it's already been repaired at least once. So I guess I'm shopping for a new prop. The diameter and pitch seemed OK. It would occasionally have problems getting out of the hole, but I attribute that more to my reluctance to throttle up quickly and push the engine past 4000 RPM. Was hitting 23 knots (26.5 MPH) at 3500 RPM. Unfortunately I never got it to WOT because the seas weren't calm in the four trips I ran with it. But I did push it close to WOT once - it hit 28 knots (32 MPH) at about 4400 RPM in 2 ft seas before the pounding made me dial it back. This was with half-to-3/4 fuel, and 4-5 people + supplies aboard, so fairly well loaded (honestly I haven't noticed much change in performance as fuel is burned off, except ease of getting onto plane). Does that sound about right performance-wise?

    I noticed Solas offers a stainless steel 17-3/4 x 21 prop for about the same price as Mercruiser's aluminum prop. Are they reputable? Will I have problems with the material change at the same pitch? Any other suggestions for brands? Or is there some reason to stick with Mercruiser?
    1994 2556, 350 MAG MPI Horizon, Bravo 2

    #2
    Solas does make a good prop.

    Provided you keep up on your "zincs" you should be fine in regards to corrosion. And your boat should be equipped with a galvanic isolator as well.

    In regards to performance, a 4 blade prop usually gives you better hole shot and will maintain plane at slower speeds. You tend to sacrifice some top end speed which it sounds like you are not concerned about. Also, based upon the numbers you posted the current prop size sounds about right as 4600-5000 is the max RPM range you want to be in with the 350 Mag MPI. The benefit of a stainless is usually a better top end speed. Stainless is not as forgiving so if you do boat in shallow areas take that into consideration.

    Regardless of the route you go, see if the current one can be repaired as a backup.
    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


      #3
      According to the Bayliner Customer Care website parts manual for that boat, the stock prop is a 15 1/2x18p, if that helps. That's both for the 5.7 and 7.4 motors listed.
      1996 2252 LS Capri Cuddy Cabin. Merc. 5.7L . Port Perry, Ontario, Canada.

      Comment


        #4
        "Ion66" post=818140 wrote:
        According to the Bayliner Customer Care website parts manual for that boat, the stock prop is a 15 1/2x18p, if that helps. That's both for the 5.7 and 7.4 motors listed.
        That'd be pretty small for a B2 drive. Mines 18.25 X 19p
        Dave
        Edmonds, WA
        "THE FIX"
        '93 2556
        Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

        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
          Take a look at powertech propellers. I have one on my B2 drive and like it.
          Kevin & Robyn
          Koppers Kove
          MMSI 338206107
          2001 Bayliner 2452
          5.7 B2 PT BRA3 17p

          Comment


            #6
            "builderdude" post=818145 wrote:
            "Ion66" post=818140 wrote:
            According to the Bayliner Customer Care website parts manual for that boat, the stock prop is a 15 1/2x18p, if that helps. That's both for the 5.7 and 7.4 motors listed.
            That'd be pretty small for a B2 drive. Mines 18.25 X 19p
            2556 FL 1994

            5.7 BRAVO II 2.01

            ENGINE SYSTEMS

            * 34101 5.7LITER MERC BRAVO II ENGINE EA 1

            * 51205 15 1/2 X 18 PROP-MERC I/O EA 1

            * 36315 3" RISER KIT ALPHA EA 1

            * 36617 RISER ELBOW 5.0/5.7 LITRE V-8 EA 1

            * 13997 PERFECT SEAL #4 SEALING COMPOUND PT

            That's from the Bayliner parts catalog on the webpage: http://www.baylinercustomercare.com/
            1996 2252 LS Capri Cuddy Cabin. Merc. 5.7L . Port Perry, Ontario, Canada.

            Comment


              #7
              This has gotten a bit off track. I did confirm it with Mercruiser's prop selector before posting. It recommended 17-3/4" x 21", or 18" x 19" with the Bravo II. Drop it down to an Alpha OD and it recommends a 15" dia prop.

              https://www.mercurymarine.com/en/us/propellers/selector
              1994 2556, 350 MAG MPI Horizon, Bravo 2

              Comment


                #8
                Arrgh. The propeller nut on the Bravo 2 is 1-7/16", not 1-1/16" like most props. Guess I'm putting this 1-1/16" socket on craigslist since it's not worth the shipping to send it back.
                1994 2556, 350 MAG MPI Horizon, Bravo 2

                Comment

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