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Complete repowering of a brick

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Old 10-07-2015 | 09:13 AM
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Originally Posted by Knot 4 Me
Did you go over what your goals were performance-wise? If top end is you main goal, then 3 x 3's on that hull should be the fastest props. You need to find a set, 4 blade or 3 blade, that you can turn 5,200 RPM at WOT. I'd still be interested in seeing what a set of 4 x 3 XR's, properly pitched, would do on your boat.
Goal was to get out of the hole faster, was not looking for top end. That said, adding 100HP there should have been something. I do come up on plane faster but what helps in this area more is the 4x4, the 3x3 (26) would top out at 5050. Figuring the 24 pitch original props were turning 5200 with original engine, it should over rev with this one.

I agree with the 4x4s causing bow down attitude. I tried a set on my boat, could not free up the bow even at full trim. Went back to the 3x3s so I could get the bow up.

I'd think some work on the 3x3 props would help - it doesn't sound like you have a problem planing with them, so work them to get what you want.

If that doesn't work, it might be the hull design. Mine has wedges on the outboard strakes, and no matter how much power you put in my hull, it tops out around 65. Guys have tried big power - 700 hp in a 4500# 25' hull. THey see just over 70.

Yours might be the same, w/o significant hull mods, you may be topped out.
Was having similar trim issue using the 3x3's. Cannot say it was exact because was looking at that area but not as close. Since rebuild have never been able to trim as before, but also say my gauge doesn't work anymore. Using just from feel and use to hold the trim up button a bit longer after planning prior
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Old 10-14-2015 | 04:56 PM
  #312  
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Pulled the boat out today and winterized.
Here you see a straight edge with the transom and it's right where it should be from my point of view



Here is the hook, first I thought it went across the hull but the only hook is just on the outer 12 inches of the hull and just in front of the tabs, did notice a new discoloration, hope its not a crack, but will get into it later




Last edited by AllDodge; 10-14-2015 at 06:31 PM.
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Old 10-15-2015 | 01:11 AM
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Since your exhaust locations were off center any chance the outdrive is cockeyed? Your hull looks rough. What is all that
flaking stuff? Yes that looks like a crack. I was really cheering for you to get a big gain in top speed. All the work you did last
year and be kind of where you started sure sucks donkey!!
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Old 10-15-2015 | 06:19 AM
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Flaky hull not helping, yes, unfortunately that looks like a crack and it looks like your tabs may be dragging, They should be angled up a bit when fully raised. There is a simple fix for that without relocating anything.
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Old 10-15-2015 | 07:31 AM
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Don't see the drive being cocked, the holes are the same as original. It might be a crack, will get further into it later.

The flaky stuff is paint that is flaking off because I did spot sanding and quick coat of paint. Plan to do a complete redo on the bottom for next season. Had it redone by a dealer three years ago and they did a bad job, ever since I've had trouble with it. Going to take if off the trailer and really get to the bottom.

The tabs are above the bottom of the hull about 1/4 inch. The tabs are a bit above flat just doesn't look like it from the pic.
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Old 10-15-2015 | 12:13 PM
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Looking at that paint, that could change the performance of the hull quite a bit. If the flaking is twice as bad as it was before, I could see the extra HP going into fighting the drag from flaking. IMO, you are going to have to fix that before you'll know what the new combo will do.
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Old 10-15-2015 | 12:23 PM
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It was doing some of the same for past few years, not as bad as this time but some. Just don't see removing 300 pounds (probably more with the rebuild) and add over 100hp and gain nothing on top end. All of this being taken away by some extra paint flaking
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Old 10-15-2015 | 12:26 PM
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On my 22 foot bowrider, I will lose an easy 4 mph throughout the course of the season just from the bottom being scummed up, I could see the condition of that bottom costing you a significant amount of speed.
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Old 10-15-2015 | 12:36 PM
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Agree with growth, but I have ablative paint and any growth that would happen to be on the hull is worn away every time the boat starts moving. Even though you all may be right, the before and after is basically the same when it comes to the hull.

The only thing that makes some since to me is the trim angle. I use to be able to get the bow higher and the stern was deeper, now it all comes up and trim is less. Bow is still up just not as high. Remember I even removed all the anchor and chain and gained almost 1mph using the 26 pitch 3x3

Edit: I got into the crack and it appears to be a hair line into the Gelcoat but only about 2 inches, will need to dig in further later
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Old 10-15-2015 | 02:49 PM
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Originally Posted by AllDodge
Don't see the drive being cocked, the holes are the same as original. It might be a crack, will get further into it later.

The flaky stuff is paint that is flaking off because I did spot sanding and quick coat of paint. Plan to do a complete redo on the bottom for next season. Had it redone by a dealer three years ago and they did a bad job, ever since I've had trouble with it. Going to take if off the trailer and really get to the bottom.

The tabs are above the bottom of the hull about 1/4 inch. The tabs are a bit above flat just doesn't look like it from the pic.
Dodge as I mentioned I redid my hull before this season and it made zero difference in speed, but now that I see yours I can say that mine was much smoother to start with. I had the bottom soda blasted then sanded with 80 then painted with Interlux VC Performance Epoxy with Teflon. Its not rated for in water boats and makes no claims of being an anti fouling paint but man my hull was by far the cleanest in our marina at the end of the summer. My boat stayed in the fresh water lake all summer and my dock neighbor had 1/4 of scum and I barely had any, I did a quick spray with a cleaner and pressure washed it off, no scrubbing. Not sure where you boat but it might be worth doing this instead of reapplying bottom paint. I couldnt be happier with mine
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