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600hp Dissapointed top speed and take off!

Old 07-21-2011, 11:32 AM
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Join Date: Jul 2010
Location: Sunset, Utah
My Boats: 1989 CARRERA, 23.5 Classic
Posts: 17

[QUOTE=onesickpantera;3458503]I hate to say it but the fact that you're only turning a 21P prop to 5100 tells me you're down on power.

Personally I would try a 23P Rev4 and see what happens. But I'm guessing similar speeds at lower rpms.

Are you getting full timing advance? Jetted correctly for your altitude?[QUOTE]

I am not sure how to check if i am getting full timing advance. It was jetted in Hurricane utah now that i think about it. I boat at 4800ft it was tuned for 3200ft. Is that a big enough differnce to cause that much power loss? And also does anyone kno what the timing should be set at?
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Old 07-21-2011, 12:17 PM
Join Date: Jan 2009
Location: Wilson, NY
My Boats: 1997 33' Scarab...twin 502's.. 05 F350 SD 4x4 CC Dually
Posts: 935

Timing 34* total. It may be a jetting issue...but as stated before, if your turning a 21p at 5100....anything bigger is gonna pull the rpms down into the 4500-4700 range. I think your down on power sir. My old boat (25' Chris Craft Limited) had a slightly warmed up 502 in it. I had a labbed 25p Mirage Plus on it...and it went 67 mph (GPS) at 5000 rpm's. Do you know what jets are in it now ? Did you look down the top of the carb to see if the throttle blades were perfectly vertical with the throttle pushed all the way forward (engine off) ? This will tell you if your throttle is adjusted right, and your actually getting WOT. Just an idea.

Last edited by tinman565; 07-21-2011 at 12:22 PM.
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Old 07-21-2011, 04:32 PM
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Join Date: Aug 2005
Location: Between A Womans Leggs in IL
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Posts: 6,321
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I'm guessing the boat has foam cores and is saturated with water.. Find out what the stock weight is and trailer is and go have the boat weighed..
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