Vibration after adding a wedge.
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Vibration after adding a wedge.

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    Senior Member NO BUTT NO PUTT's Avatar
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    Default Vibration after adding a wedge.

    I decided to put a 4deg wedge in for a little more roost. And at 3500-4000 rpms only it vibrates pretty good, after 4000rpms it goes away, you can feel it in the floor. Any ideas???

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    Quote Originally Posted by NO BUTT NO PUTT View Post
    I decided to put a 4deg wedge in for a little more roost. And at 3500-4000 rpms only it vibrates pretty good, after 4000rpms it goes away, you can feel it in the floor. Any ideas???
    Your putting to much strain on that chevy motor

    Thats odd i have never heard of a vibration starting from adding wedge.

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    Wet
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    It's the wrong wedge. Stop looking at the snoot's wedge, but start looking for the debris that's WEDGED in your impeller.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by Wet Dream View Post
    It's the wrong wedge. Stop looking at the snoot's wedge, but start looking for the debris that's WEDGED in your impeller.
    That's the only thing that I can think of that makes ANY sense, but, I've never had an "intermitant" vibration from debris in the impeller, just complete cavitation & vibration (that didn't go away).
    Maybe something made it thru the imp. and lodged at the front of the bowl vanes?
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    Senior Member NO BUTT NO PUTT's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    That's the only thing that I can think of that makes ANY sense, but, I've never had an "intermitant" vibration from debris in the impeller, just complete cavitation & vibration (that didn't go away).
    Maybe something made it thru the imp. and lodged at the front of the bowl vanes?

    To wear I would only have a vibration at 3500-4000 rpms. It vibrates in that entire rpm range.

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    Senior Member jetboatperformance's Avatar
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    NB ,It seems unlikely that a wedge change could /would cause any sort of vibration or harmonic,there is however the chance that maybe some hardware or cable or ?? is positioned differently in the flow ? (trim fwd /rev etc? ) just a thought Tom

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    jetboataholic HawaiianJet's Avatar
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    Is everything tight and adjusted properly?
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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Loader?????? Some kind of harmonic there?? A weld on it just HAPPEN to break loose at/nearly the same time???

    Sure merits a close inspection at least, VERY close inspection.

    Really crazy one no butt, butt (lol), something developing a harmonic vibration in that RPM range is what it now strikes me, check ALL hardware for anything coming loose.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    Senior Member GT Jets's Avatar
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    I would be checking for a broken impeller/stator vane, may have been there before just not as pronounced...Simply an out loud thought.

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    You account for all your tools????

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    If you haven't found your vib problem yet, I'd take the wedge back out, go run the boat without it and make sure that is where your problem is coming from. Something may have just happened at the same time you put the wedge in. This is the way to find out for sure if it was cteated by the installation of the wedge.

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    "BOATLESS" blender over's Avatar
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    its your u-joint coupler's out of alliment

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    Wet
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    Quote Originally Posted by SmokinLowriderSS View Post
    That's the only thing that I can think of that makes ANY sense, but, I've never had an "intermitant" vibration from debris in the impeller, just complete cavitation & vibration (that didn't go away).
    Maybe something made it thru the imp. and lodged at the front of the bowl vanes?

    2 instances that lead me to believe my theory:

    Small dried stick about the size of a swisher sweet lodged in the impeller, caused vibes from 2800 and up. Could have run it up, but wasn't far from the dock and ran it in.

    First time out with the new motor, I installed the wrong flex plate. Not balanced to the rotating assy. Idle up to 2500 was fine. 2500 to 4800 was teeth jarring, and from there up to 6000, nice and smooth. The harmonics balanced themselves...from what I could feel, but I'm sure the subharmonics on the crank were wicked nasty.

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