pump cavitates bad
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pump cavitates bad

  1. #1
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    Default pump cavitates bad

    just finished my brothers boat today 1986 bahner 19 foot it has a stock bbc we just put shim head gaskets to bring up comp slightly and put in a comp cams 292 hyd bump stick performer intake and holley 750 vac sec. berkley jc pump thats been set back about four inch no place diverter .this boat planes out quick rides really good but when you go to turn the engine just revs up and the boat just seems to stop you gotta let off of throttle and kinda let the two get back in sync and let boat come back in to water and almost stop then its fine what do guys think is the problem and how to fix...... thanks

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  3. #2
    Senior Member GT Jets's Avatar
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    Sounds like a loader is required......Does it have a shoe?
    GT


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  4. #3
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    Quote Originally Posted by lowlow62 View Post
    just finished my brothers boat today 1986 bahner 19 foot it has a stock bbc we just put shim head gaskets to bring up comp slightly and put in a comp cams 292 hyd bump stick performer intake and holley 750 vac sec. berkley jc pump thats been set back about four inch no place diverter .this boat planes out quick rides really good but when you go to turn the engine just revs up and the boat just seems to stop you gotta let off of throttle and kinda let the two get back in sync and let boat come back in to water and almost stop then its fine what do guys think is the problem and how to fix...... thanks



    So you lowered the compression ? you moved the intake ? and your sucking air up the pump -- humm
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  6. #4
    Wet
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    How tight of a turn are you trying to make? If you are trying to flip it around like a jetski, some hulls will, others won't. Basically, it sounds like the hard turn is creating a lot of disturbed water and sucking air. My Hallett acted just like that. It would begin and complete a hard u-turn, but you had to let off the throttle and let it settle.

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    actually the shim gasket part #gm 14015351 is .022 thick when compressed and felpro 8180-pt-1 is .038 not much but still. and yeah the intake is moved back also 4 inch it does have a shoe but no ride plate and a stock rock grate

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    so MR. wet you think thats just the way this boat is , theres really no fix, just learn to drive it or maybe a loader like suggested ?

  9. #7
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    Quote Originally Posted by lowlow62 View Post
    so MR. wet you think thats just the way this boat is , theres really no fix, just learn to drive it or maybe a loader like suggested ?
    I do. You'll get to the point where you know just how fast and sharp you can turn it without completely losing the pump. The stock rock grate is good for up to 65, after that, go loader. Having a loader won't help with the turbulence in a sharp turn, but will be more beneficial and stable at speed.

  10. #8
    Boat Nut sleekcrafter's Avatar
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    A set back-pump is prone to cavitaion, with out a ride plate. Also it's possible to expose the pump intake to air, in sharp or steep turns.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


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    alright thanks for the advise and know how we'll put a ride plate on it next and call it done for this season ..real quick what is the purpose of a shoe ? and do we need it ?

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