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  1. #1

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    FXHO Pump Differences

    I need a quick education on early 2000’s jet pumps. What is the difference between, say the ‘05 FXHO jet pump, and the older style “non-HO” jet pumps. They’re both 155mm, right?


  2. #2

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    It's all about the hub size. The HO pump has a wider hub in the center. Otherwise, the parts are pretty much the same. The impeller shafts are interchangeable between the FX models, but some other models use different length shafts.

    Because of the different hub sizes, the impellers are not interchangeable. Same is true for the bearings, seals and cavitation cones.

    My guess is that the bigger hub means there's less space for water to pass through, which translates to greater thrust.

    Class dismissed.

  3. #3

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    Quote Originally Posted by grumpy_steven View Post
    It's all about the hub size. The HO pump has a wider hub in the center. Otherwise, the parts are pretty much the same. The impeller shafts are interchangeable between the FX models, but some other models use different length shafts.

    Because of the different hub sizes, the impellers are not interchangeable. Same is true for the bearings, seals and cavitation cones.

    My guess is that the bigger hub means there's less space for water to pass through, which translates to greater thrust.

    Class dismissed.
    Lol you can’t say “Class dismissed” right after you just said “My guess is...”


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  5. #4
    fx160's Avatar
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    The Ho pumps had a 2 inch extension
    I believe the rest was the same
    So shaft should be longer as well

  6. #5

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    Quote Originally Posted by Robb235 View Post
    Lol you can’t say “Class dismissed” right after you just said “My guess is...”
    The "quick education" requested was about the differences between the pumps. That part of the lesson was completed.

    The speculation about the physics behind the differences was a topic for further research, AKA homework.

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