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Alway come here first.... if your not sure, ask us...
anything in writing? hwta was it reoresented as?? who was the shop? what specifically were you told, whats the build sheet say?? |
Basically I walked in to shop said I had to spin a 30 at 5500 to get at least 80 mph he said oh I can do that for ya so I payed the guy and he removed installed the new motor and I trailered it home to test it by myself because he said he no way of putting it in the water so after buying 2000 dollars in props and a bunch of time the best I got was 73 w a 4 blade 28 and I have oil leaking all over builder that we still don’t have. A date to correct maybe next week he said in writing I just have a few notes and the prices for all the additional work like paint job rand r and on the heading it says 700 hp there is no way it’s 700 hp any advice on my next move would be greatly appreciated the motor sounds good but it doesn’t push the boat to the speed I payed for I told him I want an 80 mph. BOat didn’t haggle the price I payed an enormous amount of money for 5 mph at best I feel like I’m stuck ina position |
Originally Posted by phragle
(Post 4629464)
Well... The motor Im finishing should make about 625...Im praying to kiss 80 and that is a 22 foot boat thats a LOT lighter than yours.....
Dry weight best I can find is about 5750,,,given the fact that every mfg's dry weight number is more optimistic than it pitot speedo, with gear people fuel, beer cooler etc your probably looking at 7000 pounds. so when we plug 7000 pounds.+ a constant of 240 ( resonabley good shape single step bottom), 675 hp and an optimistic 8-9% slip. into the bam speed calculator (which is pretty good when given realistic infornation) you get a top speed of 75 mph, per the calculator to hit 80 you need at least 778 hp. blueprint the bottom, put the boat on a diet, you can get close with 675 hp Also when doing the math with your max 71 speed, your motor (if everything else is good) is making about 100 hp less than claimed.... |
Originally Posted by Zone 5
(Post 4629497)
The boat on trailer with 1/2 tank of fuel (50 gal) weighed 7400 lbs on certified scale, Trailer weighed 1700. So boat weight was 5700 with fuel and gear, no passengers.
So adding 200 for operator... https://cimg4.ibsrv.net/gimg/www.off...d062dfc867.jpg |
Originally Posted by phragle
(Post 4629502)
So adding 200 for operator...
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Originally Posted by Zone 5
(Post 4629506)
I think you are being nice to the boat using 250. :-) that hull isn't that good. That boat with around 600 HP ran 72
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i appreciate everyones time regarding my situation im leaning towards a procharger m3sc kit as i do not want to cut up the hatch what do u all think as i am learning to ask the professionals lol
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Whats the compression of your motor?? whats the valve train/cam? Do you have someone that can tune it? Thats a decent size boat with a bravo. are you ready to upgrade the drive and or replace it? Do you have the knowledge to properly setup the fuel system? is the oil system up to the task? Is your bank account comfortable with it??
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I think before you start throwing money at it you need to find out what is in that motor and how much hp it does make.Then start adding hp to it. |
You guys are great Comp is 9.8:1 has brodex Heads 360 cc dart block eagle crank I have a aero 1000 pump w a return line already plumbed also I have upgraded to Xr drive no my bank account is not happy so I’m trying to sell my 509 that ran great and the bravo drive all fresh water stuff w low hrs so that may help not sure what oil system has to do w it but everything u guys say I value greatly don’t want hurt the engine builder name but he sure missed the mark maybe a long winter had his intentions twisted |
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