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What performance change can I expect?-gctid398805

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    What performance change can I expect?-gctid398805

    Just purchased a new outdrive for my 1993 5.0 LX 2655. Couldn't get a 1.50 ratio (as was on the boat previously) as they are supposedly on special order so I bought the 1.62 that the shop had in stock. The technician at the shop said there would be very little if any noticeable difference in speed and overall performance; he said at most I may need to change my prop. Anyone here have any similar experience or knowledge about this? Is the shop being truthful to me or do they just give me a sales pitch? Thanks.

    #2
    What drive?

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      #3
      I would use what Mercury Marine recommends.

      Perhaps see if there is a web site that allows you to plug in numbers and determine engine/drive components.

      Just curious... what did the drive cost you?

      .
      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

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        #4
        The leg is a Mercruiser; it cost $1900 plus tax . An excellent price I think.

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          #5
          Going from the 1.47 (1.50) to the 1.62 will not be that noticeable.

          You may need to up your prop pitch a little, but that depends on your WOT rpm's.

          Install it and check your WOT rpm's - adjust pitch if needed.

          Also as a side note, sometimes the 1.62 actually works a little better on marginal power 5.0 or 5.7 engines.

          Comment


            #6
            1.62 is a better ratio for the 5.0 in that boat anyways. You could run 1.84 and it would be OK. It would give you more prop options. I'm betting you probably run a 15 pitch with the 1.50. to get it to plane. 17 tops.

            Comment


              #7
              Jeff H wrote:
              Going from the 1.47 (1.50) to the 1.62 will not be that noticeable.

              You may need to up your prop pitch a little, but that depends on your WOT rpm's.

              Install it and check your WOT rpm's - adjust pitch if needed.

              Also as a side note, sometimes the 1.62 actually works a little better on marginal power 5.0 or 5.7 engines.
              Marine Engine and Propulsion rule #101: There is no substitute for a correct ratio for the engine HP and Torque rating.

              We can try props all day long, and never get things to work correctly and efficiently.

              However, given that this is a 2655 w/ the 5.0L, I would agree with Jeff......, I do think that you'll be OK.
              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


                #8
                It sounds to me like he already owns the new 1.62:1 outdrive. If that's true, shouldn't any discussion from this point on should be directed to making it work for him?

                Comment


                  #9
                  Yep, that's why I posted; However, given that this is a 2655 w/ the 5.0L, I would agree with Jeff......, I do think that you'll be OK.
                  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


                    #10
                    Thunder wrote:
                    1.62 is a better ratio for the 5.0 in that boat anyways. You could run 1.84 and it would be OK. It would give you more prop options. I'm betting you probably run a 15 pitch with the 1.50. to get it to plane. 17 tops.
                    Yes I ran a 17 pitch with the 1.50. I will be trying the boat out on the weekend with the same prop. I will see how it goes with wot and re-pitch if necessary.

                    Comment


                      #11
                      whiskywizard wrote:
                      It sounds to me like he already owns the new 1.62:1 outdrive. If that's true, shouldn't any discussion from this point on should be directed to making it work for him?
                      Yes I do have the 1.62 and it is installed. Will try it this weekend. Thanks for your replies. I will let you all know how it turns out.

                      Comment


                        #12
                        I took the boat out for a 6 hour trip on the weekend. It performed well on the new 1.62 ratio leg. I did notice it gained 200 or so rpm on and the engine can now push the prop past redline. I used the 15 x 17p prop I had on the 1.50 ratio outdrive so I will change it out to a 15 x 19. I think it will make things right.

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