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Transom raising questions

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  • Transom raising questions

    I have a 16 ft jon boat that I use for bowfishing. I need a bigger motor but cant find many that will fit my short 15" transom. I have found enough good deals on long shaft motors that I have decided to raise my transom. I had one guy on a forum tell me that he sandwiched a piece of thick steel between two pieces of 5/8 plywood and bolted it on, and it holds up a 55 horse motor great. I want to put a 40 horse on there and think that this holds up to my skill level

    A few questions about it

    How thick of steel should I use?

    Will I need to use aluminum bolts to prevent the boat reacting with steel bolts?

    Should I bolt the plate to the outside or inside of the boats transom?

    Does it need to go over both sides of the transom?



    OOOOOR

    I buy one of these
    http://www.iboats.com/Transom-Elevat...-view_id.40157

    One question, do I need to drill the holes to mount it?

    Will it spread out the weight enough to not stress the transom?

    Does it need a lip on top of the mount to prevent my motor from sliding off?


  • #2
    Re: Transom raising questions

    Skip the steel.

    There are a couple of ways to do it.

    You can cut two pieces of aluminum and sandwich a piece of plywood, the aluminum will also sandwich the existing transom and extend down at last 6 inches.


    Or you can have someone fabricate a riser from aluminum and either weld or bolt it place.

    Comment



    • #3
      Re: Transom raising questions

      The only reason I was leaning to steel is because I am not sure where I can get aluminum without having to buy a whole sheet, the place I go to now will just use their huge shears and cut me off what I need.

      Comment



      • #4
        Re: Transom raising questions

        Need an idea of what size motor your going to use. The plywood sandwiched between aluminum is best. Steel will work but I would paint heavily (maybe bedliner stuff) with something so that it does not contact the aluminum.
        The Crestliner Restoration

        http://forums.iboats.com/showthread....49#post2218249

        1967 16' Crestliner and 60hp Johnny

        Klamath Trailorboat and 9.9 Johnny

        Comment



        • #5
          Re: Transom raising questions

          Probably 40 horse, I wasnt planning on having the steel touching the boat if I could help it.

          Comment



          • #6
            Re: Transom raising questions

            Originally posted by crablegs View Post
            The only reason I was leaning to steel is because I am not sure where I can get aluminum without having to buy a whole sheet, the place I go to now will just use their huge shears and cut me off what I need.
            If they won't cut the pieces then find another place to by it, its very easy to find a place to buy aluminum cut to the size you want.

            Comment



            • #7
              Re: Transom raising questions

              So would it be better to have two pieces of aluminum with plywood in between? or the other way around

              What kind of design should I go for, a piece of aluminum that slips over the front of the transom, plywood next, then aluminum that slips over the back of the transom?

              Comment



              • #8
                Re: Transom raising questions

                You can use this style outboard lift. It is made specifically for what you want to do.

                http://www.dhcampingandfishingsupply.com/50012.html

                Regards,

                ''Fish Me Gone''



                Democracy will cease to exist when you take away from those who are willing to work and give it to those who are not......Thomas Jefferson




                sigpic
                Find out how you can help prevent the spread of Zebra mussels.
                http://wgfd.wyo.gov/web2011/fishing-1000206.aspx

                Comment



                • #9
                  Re: Transom raising questions

                  Would that spread the weight around enough on the transom? The outboard is a bolt on that Im looking at, would the holes match up?

                  Comment



                  • #10
                    Re: Transom raising questions

                    There should be a plate attached to the boat that will tell what the HP rating for the hull. What doe it say the MAX HP is?

                    As for will your transom be strong enough to hold the raised O/B without more support....we have no idea, you haven't told us the brand, model or age of the boat, or the brand, year and model of 40HP motor you're looking at.

                    Comment



                    • #11
                      Re: Transom raising questions

                      Its a polarkraft 1652 jon boat, older hull, early 70's I think. Im not sure where the plate is on it, but if I use the length x width -90 and divided by 2 (along the lines of that) it comes to 50 horsepower.

                      The motor Im looking at is a 40 merc

                      Comment



                      • #12
                        Re: Transom raising questions

                        Gee, How about bolting two pieces of heavy angle iron to the transom, sticking up. Now bolt a piece of 2X6 pressure treated lumber or two 3/4" plywood pieces flush with the existing transom. That should hold a 40 HP motor.

                        Comment



                        • #13
                          Re: Transom raising questions

                          I had the same trouble your having. Here`s what I did and it works great. Only down fall is it weigh`s about 15lbs. I took some 1 1/2 square tubing cut it 13" long that`s how long my transom is. I needed to raise mine 7" so I went up seven inches with the tubing and welded all the tubing together. Took some 1/8" steel diamond plate and cut it 13"x 12" and welded that to the tubing. So from the top of the tubing it goes down 12" I have a 4" over hang on the transom that I drilled four holes in and put 3/8" bolts through. Painted it with rhino lining type stuff so it doesn`t rust. It works great for me. I looked into this for a month or so at all the jack plates and didn`t like any of them. I took this to the fab shop and he knew exactly what I wanted as he had just finished another one. If you have any questions I can send you all the specs just pm me. Hope this helps.

                          Comment



                          • #14
                            Re: Transom raising questions

                            On a 40hp motor I would use 1/2" bolts. You almost double the bolt strength from 3/8" to 1/2"
                            The Crestliner Restoration

                            http://forums.iboats.com/showthread....49#post2218249

                            1967 16' Crestliner and 60hp Johnny

                            Klamath Trailorboat and 9.9 Johnny

                            Comment



                            • #15
                              Re: Transom raising questions

                              Originally posted by rjn cajun View Post
                              I had the same trouble your having. Here`s what I did and it works great. Only down fall is it weigh`s about 15lbs. I took some 1 1/2 square tubing cut it 13" long that`s how long my transom is. I needed to raise mine 7" so I went up seven inches with the tubing and welded all the tubing together. Took some 1/8" steel diamond plate and cut it 13"x 12" and welded that to the tubing. So from the top of the tubing it goes down 12" I have a 4" over hang on the transom that I drilled four holes in and put 3/8" bolts through. Painted it with rhino lining type stuff so it doesn`t rust. It works great for me. I looked into this for a month or so at all the jack plates and didn`t like any of them. I took this to the fab shop and he knew exactly what I wanted as he had just finished another one. If you have any questions I can send you all the specs just pm me. Hope this helps.
                              You got any pictures?

                              Comment


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