cant get over 50mph why why

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09-15-2014, 03:07 PM

#41

Jonesyfxr

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I was taught this by a tutor once....

Read something out loud to yourself and if it sounds weird, it probably is.

09-15-2014, 05:44 PM

#42

vintagespeed

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mi wfe ants mee git hrr nam in m idik, do u tattoo werk ? .

09-15-2014, 11:03 PM

#43

Movie muscle

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Quote:

Originally Posted by sparky24

thats strange i had a 22 footer that did 59 consistently on gps with a 300 magnum smallblock and a 17 pitch prop. i think it could have used a 21 pitch too. It had a 1.5 ratio alpha with a snapped off skeg lol

i would think your not actually making 350 hp. Do a leak down on the motor and get the specs on the heads and bottom end.

Well here we have a boat that defies science lol. At 5000 rpm , a 1.5 gear ratio, a 17 pitch prop ( I will assume cupped for benefit on your side, which means it is calculated as one inch more at 18) a boat speed of 59 mph gives us a negative slip of 3.8%......so you are claiming to travel at a speed greater than what the prop could deliver in a zero slippage environment. An uncupped prop would deliver negative 9% slip but most regular stainless performance props are cupped. If you were turning 6000rpm you could manage 59 mph though. At 6000 you are WAY over the motors recommended max WOT.Trolling to play perhaps lol?

Last edited by Movie muscle; 09-16-2014 at 01:27 AM.

09-16-2014, 07:39 AM

#44

triplethreat

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Has anyone checked the carb with breather off to see if butterflies are fully open at wide open throttle, could be something as simple and a cable adjustment with the new carb.