Wax it or not???
#1
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Wax it or not???
I have read a couple of threads mentioning waxing the bottom of your boat is not good. Whats the overall consensus?
I think my boat is way too slow for what power I have. 26 foot Baja Force with twin 350 mags, only stock difference is the cams. Running 63 on Gps, 66 on speedo. The props are 23 pitched mirage's. 4750 Rpms. Does that sound right or too slow?
Thanks for all your input.
I think my boat is way too slow for what power I have. 26 foot Baja Force with twin 350 mags, only stock difference is the cams. Running 63 on Gps, 66 on speedo. The props are 23 pitched mirage's. 4750 Rpms. Does that sound right or too slow?
Thanks for all your input.
#2
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I ran the numbers thru the mercruiser site, it came up with 68 top speed. I'm not sure if they take slip into account. You may want to run the numbers yourself, you have a better idea of the weight of the boat.
http://www.mercurymarine.com/cgi-bin...UseBVCookie=no
you can also run the numbers at
http://www.go-fast.com/Prop_Slip_Calculator.htm
Sounds to me that you are right about where it should be.
http://www.mercurymarine.com/cgi-bin...UseBVCookie=no
you can also run the numbers at
http://www.go-fast.com/Prop_Slip_Calculator.htm
Sounds to me that you are right about where it should be.
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I just recently blasted bottom paint off the hull. It is a little rough right now. I have some more testing to do with it the way it is, then I am going to wax the hull or put some kind of speed coating on it and see if it makes any difference. If the wax slows it down, I don't figure it will be too hard to remove it. I will keep you posted. Hopefully, I will have most of the tweaking done this weekend. I will keep you posted.
#6
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RPM's are too low your engines are struggling. Worst case should be no lower than 4800-4850. Of course I'm assuming their MAG'S which are rated at 46-5000.
Either that boat is super heavy or you need to bump down the pitch. Try 21's or 22 Bravo's...
As far as wax goes, there's two schools on thisone. One sez wax it and it will increase speed. The other sez take high grit sand paper and rough up the surface and it will increase speed. Personally I don't think either would be noticible if they did work...
Either that boat is super heavy or you need to bump down the pitch. Try 21's or 22 Bravo's...
As far as wax goes, there's two schools on thisone. One sez wax it and it will increase speed. The other sez take high grit sand paper and rough up the surface and it will increase speed. Personally I don't think either would be noticible if they did work...
Last edited by Reckless32; 03-07-2002 at 01:00 PM.
#7
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On a good day, 2 people 1/4 tank. it will hit 4850. on a bad day, full tank 8 people 45-4600. On the engines, its stamped max rpm 4600 wot. I think a sbc should rev higher. I used to have 21p props on the boat, and I could get 4900, but same top speed. They also blew out real easy. The 23 pitch mirages have great hole shot and same top end. They also have a better midrange.
I would just expect this thing to go a little faster, and I am trying to figure out what might be holding it back. I guess there may not be that fix that makes it break 70's. It just seems like a short boat (26 feet) with twin mags should be faster.
I would just expect this thing to go a little faster, and I am trying to figure out what might be holding it back. I guess there may not be that fix that makes it break 70's. It just seems like a short boat (26 feet) with twin mags should be faster.
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BajaRunner, I have 24' Liberator with twin 260HP SBC's. I had 21P Mirage's on it and was hitting 4700 @ 59.6 on GPS, low fuel and 2 people. I just got 2 new drives and one is a counter rotating alpha and I got 21P Mirage +'s. I have no idea how this will perform but you seem like you are running pretty quick to me for the setup.
What kind of HP does the 350 Mag make?
What kind of HP does the 350 Mag make?
#9
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That makes me feel better...I hear all these people running 75-85 and I am thinking whats the deal. The hp on the 350 mag is not much more..270hp. Keep me updated on the counter rotating as mine are spinning in the same direction. I have heard you dont gain much speed wise but you get much better steering.
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BajaRunner, I'll let you what it's like when I get to splash it. How heavy is your Baja? I figure completely loaded with crew and fuel I'm into the mid 6000 range. Dry is around 5100 or so.