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Twins on a bracket, preferably 254 photo request

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  • Twins on a bracket, preferably 254 photo request

    Can someone post or email me photos of their 254, or something close with twins on a bracket, running showing where the water is on their engines?

    I have run 21s, 23s, 19s, and I am still getting a ton of slip. I have a fear that I put my engine bracket on too high and will have to pull the engines and lower the bracket.

    My email is my username at gmail since posting is difficult on here.

    Or if winterized, send me a pic showing what height the engine is sitting above the transom mounted on the bracket. Mine is currently 2.5" up which is how they say it should be, but I am producing about 40% slip.
    \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

  • #2
    Scroll down on Jack's build page and you can see his is mounted what looks low to but is actually perfect for a single 25" motor.

    http://www.classicmako.com/forum/top...58&whichpage=6
    1978 Mako 25 - Blind Hog
    1985 Mako 20c - sold
    Fort Walton Beach, FL
    http://www.classicmako.com/forum/top...TOPIC_ID=42841

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    • #3
      I couldnt find a bracket in this photo but I tried for like hours....


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      • #4
        The bracket should be about 1" lower then the transom cap.
        [br]1984 Mako 224[br]1977 Mako 15[br]Clermont, Florida- [br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=37212 -Rewire[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=40627 -Tank/Misc[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=58615 - Aft Box removal

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        • #5
          quote:


          Originally posted by Shakes_26


          I couldnt find a bracket in this photo but I tried for like hours....





          You can keep posting those "transom" photos.
          \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

          Comment


          • #6
            quote:


            Originally posted by Sailor


            Scroll down on Jack's build page and you can see his is mounted what looks low to but is actually perfect for a single 25" motor.


            http://www.classicmako.com/forum/top...58&whichpage=6


            photobucket made sure I could not see them.
            \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

            Comment


            • #7
              quote:


              Originally posted by snappergapper


              The bracket should be about 1" lower then the transom cap.



              My transom was setup for a single 25" and is long gone now that I have rebuilt the transom.

              I just am starting to think my cavitation plates need to be under the water, not at the surface.
              \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

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              • #8
                This is not my video but it is about where mine are running.

                https://www.youtube.com/watch?v=Sk7hFmbVcRM

                Still feel like my performance is terrible.
                \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

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                • #9
                  how are you figuring your slip?

                  what props have you tried?

                  what numbers are you seeing?

                  what motors? what hole are your motors mounted in?
                  76 25 \"Aenigma\"[br]73 17[br]Richland/Long Beach, MS[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=14182[br][br]17 project[br]http://www.classicmako.com/forum/topic.asp?TOPIC_ID=56176

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                  • #10
                    quote:


                    Originally posted by ssfishx


                    how are you figuring your slip?


                    what props have you tried?

                    what numbers are you seeing?

                    what motors? what hole are your motors mounted in?


                    Figuring slip through a calculator and speaking with Ken at prop gods.

                    I started with 15x21p and 4400 rpm gave me 26 knots. WOT would get me 39 knots.

                    Then I tried 15x23P and 4400 rpm gave me 28 knots. WOT gave me 36 knots.

                    I now have 15x19p and at 4400 rpm gives me 28 knots. WOT gives me 41 knots.

                    They are on the highest hole, twin 225 merc optimax motors. We moved them up a hole thinking the engine was too high and got them down 3/4" inch. Did no affect at all.
                    \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

                    Comment


                    • #11
                      I have 2 225 saltwater series in my 1991 251 fwc. Engines are at the highest hole and props are Rev 4 pitch 17. WOT is 38 knots at 5000 rpm. Cruising at 3300 rom is 23-24 knots full of fuel with 2 persons onboard.
                      Guaynabo, Puerto Rico[br]1996 Mako 19, twin Yamaha 85\'s (sold)[br]1991 Mako 254, twin Yamaha 225 OX66[br]

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                      • #12
                        quote:


                        Originally posted by mickyb


                        I have 2 225 saltwater series in my 1991 251 fwc. Engines are at the highest hole and props are Rev 4 pitch 17. WOT is 38 knots at 5000 rpm. Cruising at 3300 rom is 23-24 knots full of fuel with 2 persons onboard.



                        That to me is slow. Maybe I was expecting more, but with the single 225 I was cruising at 26 at 4400 rpm and WOT would get to about 30 knots.
                        \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

                        Comment


                        • #13
                          FWC hulls are a lot heavier than the regular hulls. Also the props are 4 blades which holds the top speed.

                          Before having these engines I had 2 200hp Optimax and top speed was the same but at 5500 rpm.
                          Guaynabo, Puerto Rico[br]1996 Mako 19, twin Yamaha 85\'s (sold)[br]1991 Mako 254, twin Yamaha 225 OX66[br]

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                          • #14
                            quote:


                            Originally posted by mickyb


                            FWC hulls are a lot heavier than the regular hulls. Also the props are 4 blades which holds the top speed.


                            Before having these engines I had 2 200hp Optimax and top speed was the same but at 5500 rpm.


                            Thanks for the information. I am not looking for a high top speed. I am more looking for running these engines in their most efficient RPM range at around 28-30 knots. From what I am told, that is 3400-3800 RPM and I am not getting the speed.
                            \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

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                            • #15
                              Went out this weekend with the wife and I only. Running both engines at 4400 rpm I was at 24-25 knots.

                              When I had the single I would run 4400 at 26 knots.

                              I am thoroughly confused.
                              \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

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