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Mathematically you are runing 25% slip. Something is not right. That engine makes peak power at 4600 RPM, so you are in the ball park RPM wise. This much slip tells me you've got excessive drag(or you're way over trimming). Maybe the bottom of the boat is dirty, tabs are dragging or it's not trimming out properly.
Bob Full Throttle Marine
Originally Posted by HardmanGT
(Post 3161559)
I recently purchased a pretty rare boat and finding specs or even articles has been pretty tough. The few blurbs I have found online have pretty much come from searching here. http://www.offshoreonly.com/forums/g...ance-boat.html
I am hoping to get some info from you guys. 2002 Rinker Captiva 262 SS, 496 MAG (base) Bravo 1, 1.50, 15.25X24 4 blade Bravo 1 prop. 4800 pounds empty. The engine seems strong and runs smooth throughout the rev range. Whole boat has 40 hours. From what I see, this boat should run at least 60 or better. My best has been 51 on GPS at about 4500 rpm. It acts like it's over propped in my limited opinion. I'm not sure if I am down on power or this boat really isn't as fast as I have heard it to be. Does anybody have thoughts on this? PS-my buddy was out yesterday with hos Baja 272 Islander 502, 420hp. With his labbed prop he is hitting 72-74 on GPS. That boat is even heavier than mine. It just seems to me like there is a problem |
Originally Posted by HardmanGT
(Post 3161559)
I recently purchased a pretty rare boat and finding specs or even articles has been pretty tough. The few blurbs I have found online have pretty much come from searching here. http://www.offshoreonly.com/forums/g...ance-boat.html
I am hoping to get some info from you guys. 2002 Rinker Captiva 262 SS, 496 MAG (base) Bravo 1, 1.50, 15.25X24 4 blade Bravo 1 prop. 4800 pounds empty. The engine seems strong and runs smooth throughout the rev range. Whole boat has 40 hours. From what I see, this boat should run at least 60 or better. My best has been 51 on GPS at about 4500 rpm. It acts like it's over propped in my limited opinion. I'm not sure if I am down on power or this boat really isn't as fast as I have heard it to be. Does anybody have thoughts on this? PS-my buddy was out yesterday with hos Baja 272 Islander 502, 420hp. With his labbed prop he is hitting 72-74 on GPS. That boat is even heavier than mine. It just seems to me like there is a problem Just to let you know a 272 with a 502mag runs about 66MPH. Not sure how he could have gotten those numbers unless he was on the trailor. :lolhit: |
Originally Posted by jeffswav
(Post 3162454)
Your tach may be off, like was said your prop slip it too high. I do think you may be overproped. Where do you have it trimmed at WOT. I would think the boat should run 58-60 MPH. Maybe you are in "Safe Mode" have somone hook it up to a scan tool.
Just to let you know a 272 with a 502mag runs about 66MPH. Not sure how he could have gotten those numbers unless he was on the trailor. :lolhit: I replaced 7 of the 8 plugs today (last one required some bracket removal for access, didn't have the patience today), new fuel filter and separator. Tomorrow I will check the wires with a multimeter and timing. I also found that the idler pulley is on it's way out and throwing off a fair amount of fine black plastic around the front of the engine. This also includes throwing it into the flame arrestor where it is being ingested into the throttle body and intake. |
Originally Posted by bobl
(Post 3162340)
Mathematically you are runing 25% slip. Something is not right. That engine makes peak power at 4600 RPM, so you are in the ball park RPM wise. This much slip tells me you've got excessive drag(or you're way over trimming). Maybe the bottom of the boat is dirty, tabs are dragging or it's not trimming out properly.
Bob Full Throttle Marine I have the tabs all the way up, how would I determine drag? I think I have it trimmed well but see my post above. |
What is your drive ratio? It should be stamped on the drive up by the label.
I see you posted 1.5 so ignore the question. Let us know how it runs after the tuneup. Also, you may want to try a Mirage prop if you want speed. |
Originally Posted by jeffswav
(Post 3163981)
What is your drive ratio? It should be stamped on the drive up by the label.
I see you posted 1.5 so ignore the question. Let us know how it runs after the tuneup. Also, you may want to try a Mirage prop if you want speed. The second prop I tried was a 23 Mirage, didn't want to come out of the hole. I have had the best overall performance with the 4 blade 24. I even have a labbed 23 4 blade on it right now. No real difference. Doing compression test and fuel pressure tomorrow hopefully. The marina can't hook up the scan tool for at least a week they said. Outside of all this, I am stumped. Is this really just a slow boat? |
I had a 99 Rinker Captiva 232 with a 454MagMPI, weighing 4200lb. From the factory, the boat came with a Mirage Plus 21 and top speed was 60-61. They set the boat up with the drive pretty deep--for general family use. My best speed was 63 with a Mirage Plus 23 labbed and some aftermarket manifolds.
You may be over-propped and your drive may be in deep like mine was. It may not be as fast as you are hoping. |
Now that I think about it, I'm sure I remember reading a performance report about your boat. I will look through my mags this weekend and let you know if I find it. I don't remember the numbers being bad...
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Potential is There!
I found the magazine test: Family and Performance Boating,
March 2002. Top speed with a Mag HO 425hp, standard Bravo Drive and a labbed 24 Merc prop (they didn't say which one) was 66. So it seems that 60-62 should be obtainable numbers with your package. One or more things must be wrong somewhere. Good luck with your quest... P.S. They hit 70.5mph with a 500efi and an ITS Bravo drive, same prop. |
Originally Posted by suntimes
(Post 3166977)
I found the magazine test: Family and Performance Boating,
March 2002. Top speed with a Mag HO 425hp, standard Bravo Drive and a labbed 24 Merc prop (they didn't say which one) was 66. So it seems that 60-62 should be obtainable numbers with your package. One or more things must be wrong somewhere. Good luck with your quest... P.S. They hit 70.5mph with a 500efi and an ITS Bravo drive, same prop. |
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