600hp Dissapointed top speed and take off!
#11
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Join Date: Jul 2010
Location: Sunset, Utah
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[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?
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?
#12
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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 11:22 AM.