Motor placement in 18' southwind v bottom
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Motor placement in 18' southwind v bottom

  1. #1
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    Default Motor placement in 18' southwind v bottom

    I am getting close to the mock up point on my 18' southwind v bottom. I have replaced the 1/4 stringers with 2x6x14 lvl and i am installing a rail setup with motor plates. The pump is a berkeley 12jg with a 5" setback-this puts the clean out cap all the way outside of the transom for a popoff later. I have a 545 ford built for the boat, will be going on the engine dyno prior to install but 800hp is the projected #. The boat is a light layup-not sure on exact weight but 2 guys can pick it up and move it in almost bare condition, the seating will be 2 fiberglass buckets so i can place the engine in the optimal spot. Does anyone have a good reference point for me to start from on where to place the motor?
    Thanks

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    Senior Member bc18's Avatar
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    Pm futs he would know

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    Senior Member Futs's Avatar
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    I would start in the original location. Get ready to fight a bad porpose with the pump set back that far.What was done to the bottom?

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    getting ready to do the bottom as soon as i finish glassing the other stringer. I was just going to make sure it was all straight with a 72" level and smooth out the transition into the intake

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    If I move the motor far enough forward will it help with the porpoise issue or make it worse?

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    Senior Member HBInHeat's Avatar
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    Carefull how straight u make the bottom those hulls need rocker at the transom. It seams everone thats pulled it out has porpusing issues. I know on squirtchas old 18 they had to.add trim tabs to fix it

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    id mount it in the boat. out on the deck would just look silly...





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    Quote Originally Posted by bbfsouthwind View Post
    I am getting close to the mock up point on my 18' southwind v bottom. I have replaced the 1/4 stringers with 2x6x14 lvl and i am installing a rail setup with motor plates. The pump is a berkeley 12jg with a 5" setback-this puts the clean out cap all the way outside of the transom for a popoff later. I have a 545 ford built for the boat, will be going on the engine dyno prior to install but 800hp is the projected #. The boat is a light layup-not sure on exact weight but 2 guys can pick it up and move it in almost bare condition, the seating will be 2 fiberglass buckets so i can place the engine in the optimal spot. Does anyone have a good reference point for me to start from on where to place the motor?
    Thanks
    On Southwinds Sal's boat I had to reduce the second set of strake's to about 1/4 the size and extended the center strake's all the way to the transom. The boat just has way to much lift. By moving the pump that far back I only see that the problems with this boat are going to be even worse. I agree with Futs on motor location, but if the boat goes together as is, I only see it being a real handful. Even then I still used a small set of cavatition plates to control the boat.

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    The pump is not set into the hull just yet, I had it set back because I planned on a popoff. It's sounding like I may need to move the pump back forward some. I am prepared to experiment with the setup, but I do not want to have to re-set the intake. What would be the optimal place to start with on the pump then?

  12. #10
    Senior Member ICECREAMAN's Avatar
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    Do you really need a pop-off? That hull isn't really a 100+ MPH hull with out serious work. So if your not busting into the 100+ club maybe you don't really need a pop off, and that would help eliminate one of your set up problems.

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    Senior Member HBInHeat's Avatar
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    Quote Originally Posted by bbfsouthwind:2017706
    The pump is not set into the hull just yet, I had it set back because I planned on a popoff. It's sounding like I may need to move the pump back forward some. I am prepared to experiment with the setup, but I do not want to have to re-set the intake. What would be the optimal place to start with on the pump then?
    Stock location

  14. #12
    Senior Member Futs's Avatar
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    Quote Originally Posted by bbfsouthwind View Post
    The pump is not set into the hull just yet, I had it set back because I planned on a popoff. It's sounding like I may need to move the pump back forward some. I am prepared to experiment with the setup, but I do not want to have to re-set the intake. What would be the optimal place to start with on the pump then?
    The farthest back i would put it would be 2.5"(that would be half in half out) anymore than that will be a set up nightmare. Ask Shaun how his acted when we did the bottom blueprint and a set back. I think he still has handleing issues and has since did more bottom work to remove a little bit from what i did. These boats were not designed to go fast. They were Ski boats. There have been a few that have been runners, but your just pushing the safty limits of the hull design. If you want to go fast, get a different style hull. I would say 90's is about all i would want out of one.
    Sal's was the best running 18 V bottom southwind i had ever seen run. Thing was a monster and had a ton of work into it. If your dead set on doing this, just do a relief notch in the transom to accomodate the pop off.

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    I am already 4 yrs into this project, have layed balsa floors in it and carbon fiber/Kevlar laminated into the floor and stringers, capped the boat etc. So yes I am dead set on using this boat for now, I don't plan to run it past 90 at the most. I came into boats from drag racing cars, so all I'm after is something that comes out of the hole hard. I can cut the hull to move the pump location back forward, so the hand hole bolts should be at the transom roughly?

  16. #14
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    And what so you guys consider a "ton of work" I'm no stranger to the labor involved in things like this. I have not flipped the boat yet to do the bottom so I can do whatever needed to the bottom to make the boat work.

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