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Good pitch to start with on motor/hull combo?

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  • #16
    Dude I don't think you have done your homework. There is a 10% gray area for the hp limit on boats.

    Other than that my insurance company doesn't care and there are no laws in VA that dictate hp ratings.
    Electronics Troubleshooting Guide
    http://www.cdielectronics.com/support/

    Free Online Outboard Service Manual
    http://www.boatinfo.no/lib/library.html

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    • #17
      I never worried about overpowering a boat, My first was a 15 ft rated for 90hp, Dealer very happily rigged it with a 140hp. I told the underwriter about the overpowering, they made a note of it on the policy and adjusted the premium and happily took the payment.
      I broke no Canadian Laws. I couldn't care less what the Laws are in the US as I don't boat there.

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      • #18
        I hear ya Jimmbo. I think there's a lot of hearsay on the matter. I got 140 stamped on my console so I'm not blinking an eye at the 150. Honestly I will probably only open her up just to get my prop pitch right. Other than that I doubt I'll ever take her over 4000 rpms. I just like the extra torque and I found a nice 150 for under a grand and had a parts 150 of the same year just laying around. Buddy needed the 90 that was on it so he has that now.
        Electronics Troubleshooting Guide
        http://www.cdielectronics.com/support/

        Free Online Outboard Service Manual
        http://www.boatinfo.no/lib/library.html

        Comment


        • #19
          Ok fellas, I figured Id chime back in here and give yall an idea of what I came up with.

          I have gotten the motor up to snuff and she is running great.

          I had suggestions from 18 pitch to 22 pitch prop to get me where I needed to be. I actually traded the 24-25 pitch props that I had for an 18 and a 22 pitch, both rakers. I put the 22" prop on because I felt it would be closer to where I wanted to be. I had the boat set up with an average weight, me and one other, some gear and a full tank of gas(24 gallons). The boat HAULS! At open throttle, trimmed out where I want to be, the boat was moving at 54 MPH and turning 5000 rpms. Smack in the middle of the WOT range of 4500-5500.

          Now, we fish tourneys in the boat also. Fully loaded and adding the weight of a bait tank, and two catfish livewells, the boat was still topping out at 50 MPH and 4800 rpms. And we will RARELY run the boat at WOT with full livewells. We also would only be running that much weight IF we catch two monster cats, and on the way back to the weigh-in.

          What do you guys think, should I step down in prop pitch and try it out? I feel like I am right in swinging range here. The other prop that I have, the 18 will likely bring her up to 5800 at a light load and lose 2-3 mph. (I forgot my prop wrench at home so I didnt try the 18p)

          I am thinking a 20p would be the perfect prop at this point, but I may be just splitting hairs now.........
          Electronics Troubleshooting Guide
          http://www.cdielectronics.com/support/

          Free Online Outboard Service Manual
          http://www.boatinfo.no/lib/library.html

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          • #20
            I would stick with the 22p. Don't see a point in going lower pitch. If your numbers are right you're running 4% slip with it, which is pretty darn good.

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            • #21

              That engine has a pretty large displacement for it's HP, so it will make its peak power either a bit below the 5000 mark or close to it. Propping choices that are on either side of the rpm that gives peak power will result in a lower top speed.
              Dropping down to the 20 will give you about 400 more rpms, it will also give you a better Holeshot and it have better chance of staying above 4500 if you really load the boat up. Top speed will be about 1/2 mph slower. Down side will be a slightly higher rpm for any given cruise speed, or a slightly lower speed for a given rpm.
              RAKER is good prop, as mentioned a few posts back I ran a 20 inch on my Fucht 150, rehubbed it for my Volvo Out drive and used it until I found the Enertia

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              • #22
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                Cool, thanks for all the detailed replies. Sounds like I may have hit the mark with the first prop that I put on there, thanks to all of you guys for pointing me in the right direction.

                I can tell you, 54 on this boat is............FUN.
                Electronics Troubleshooting Guide
                http://www.cdielectronics.com/support/

                Free Online Outboard Service Manual
                http://www.boatinfo.no/lib/library.html

                Comment

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