what the heck?
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what the heck?

  1. #1
    senior member turbo wog's Avatar
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    Default what the heck?

    i am driving on smooth water ready to do a speed run & all of a sudden the boat goes from a fairly good plain to, a drop in the nose , then pops back up , then drops back down ? its not a porpose,its not in rythem its kind-of few seconds apart or so . its @ 45-75 mph not sure but when i am cooling the intercooler off cruising getting ready to hit it ,it does that on light , mayby medium throttle cruise speed ! what could it be?, (i do think i did start to porpose as soon as i throttled up though) pump cavitating loosing plain then getting pressure & popping back up on plain? it seemed that i had plenty of pressure in the pump , it was smooth out almost glass but not quite.30-35lbs wot intake presure, it actualy bogged my motor down to @ 6100 rpm last time i did 6000 rpm it ws bouncing from 10-15 lbs back forth on intake pressure. cavitating? i cut & rewelded the back of the loader ramps to top load @ 1/8 inch higher, that was the only change i did .
    Last edited by turbo wog; 09-05-2008 at 01:26 PM.

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  3. #2
    TRG
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    Quote Originally Posted by turbo wog View Post
    i am driving on smooth water ready to do a speed run & all of a sudden the boat goes from a fairly good plain to, a drop in the nose , then pops back up , then drops back down ? its not a porpose,its not in rythem its kind-of few seconds apart or so . its @ 45-75 mph not sure but when i am cooling the intercooler off cruising getting ready to hit it ,it does that on light , mayby medium throttle cruise speed ! what could it be?, (i do think i did start to porpose as soon as i throttled up though) pump cavitating loosing plain then getting pressure & popping back up on plain? it seemed that i had plenty of pressure in the pump , it was smooth out almost glass but not quite.30-35lbs wot intake presure, it actualy bogged my motor down to @ 6100 rpm last time i did 6000 rpm it ws bouncing from 10-15 lbs back forth on intake pressure. cavitating? i cut & rewelded the back of the loader ramps to top load @ 1/8 inch higher, that was the only change i did .
    You are describing a hole in your boat and slowly its ripping the hull off in sheets not yet peeling off the rest to where the water comes in drasticly and you sink! (This type of scenerio happened to a guy with a 25 carribean O/D boat!)
    Maybe you should jack up the hull and just have a look cuz it dont sound good!

  4. #3
    B1 Racing cs19's Avatar
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    check your loader out real good?
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    Senior Member GT Jets's Avatar
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    It does sound like a delamination problem, could also be a vortex forming in the intake from the loader, is it a straight loader or are the ramps curved?

    And did it do it before the adjustment?

    I have seen where some hull blueprinters have added some material just before the intake to create a little pressure at the intake, is this the case with yours?

    GT

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by cs19 View Post
    check your loader out real good?
    same thing i was thinkin, i've had a loader come loose and it wasn't a great experience, but it did teach me to check the loader before every trip out doesn't take a sec to give it a good ole wiggle.

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    senior member turbo wog's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    same thing i was thinkin, i've had a loader come loose and it wasn't a great experience, but it did teach me to check the loader before every trip out doesn't take a sec to give it a good ole wiggle.
    yep.. been there ,flown out .... check mine every single time now ..just checked it & sure enough i must be cavitatiing cause it is broken ,cracked & missing parts on the loader.. one time out . (since checking last time)

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    senior member turbo wog's Avatar
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    Quote Originally Posted by GT Jets View Post
    It does sound like a delamination problem, could also be a vortex forming in the intake from the loader, is it a straight loader or are the ramps curved?

    And did it do it before the adjustment?

    I have seen where some hull blueprinters have added some material just before the intake to create a little pressure at the intake, is this the case with yours?

    GT
    the history on this boat since i got it was break impeller .. break loader ...break impeller.. break loader ..so on & so on i am pretty sure i need more pressure in the pump ?

  10. #8
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by turbo wog View Post
    yep.. been there ,flown out .... check mine every single time now ..just checked it & sure enough i must be cavitatiing cause it is broken ,cracked & missing parts on the loader.. one time out . (since checking last time)
    broke loader will cause cavitation, but i've never seen cavitation break a loader. would have to be some weird things go on for that to happen.

  11. #9
    senior member turbo wog's Avatar
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    found the broken part in the bowl. now i can reweld it back in without hunting down scrap metal. not too much carnage for the amount of weld cracks. good thing i took flying lessons while the boat was a 89mph boat, i check every time out now! i was thinking maybey the runners on the loader are too long & blocking the input at the lower part of the shoe?

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    senior member turbo wog's Avatar
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    o.k. new loader & violent porposing (slamming up & down not just bobbing up & down ) at 3800 rpms just cruising , not so bad wot though , but reducing speed it started slamming up & down again!too much intake pressure? it looked like 32psi?

  13. #11
    Senior Member GT Jets's Avatar
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    How low does that loader hang below the bottom line of the hull, sounds like a buttload.....IMO

    The loader to me sounds like its taking an awful big bite, too much.

    GT

  14. #12
    senior member turbo wog's Avatar
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    not sure yet i just put in in & ran to the river . i didn't do a straight edge yet. i guess i will have to check if it is do i just cut back the runners on the loader 1/8 " at a time? less shoe? i am still above keel 1/8" or so !

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