Seadoo LRV engine conversion - impeller suggestions please!
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  1. #1
    PWCToday Newbie 2micron's Avatar
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    Seadoo LRV engine conversion - impeller suggestions please!

    Hello All,
    Please offer some suggestions for a starting point on an impeller pitch after an engine conversion.
    The new style engine is a lower revving 4-stroke. Much lower torque curve as well, compared to the factory 947/951.
    Ski is a very heavy Seadoo LRV. Weighs a good 1000 pounds.
    Not looking for major top speed, but a hard pull for pulling skis/tubes.
    Trying to keep the rpm low for cruising around 40mph and attempt to match the impeller to the lower torque curve of the new motor.
    New Engine Specs:
    - max HP 120 at 6600 rpm
    - max TQ 110 at 4800 rpm
    - Factory impeller is 155mm and 11/21 pitch. Any suggestions would be helpful,
    Thank you!
    Andrew

  2. #2
    Top Dog Benflynn's Avatar
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    Re: Seadoo LRV engine conversion - impeller suggestions please!

    Start w 11/21

  3. #3
    PWCToday Newbie 2micron's Avatar
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    Re: Seadoo LRV engine conversion - impeller suggestions please!

    Thank you Ben.
    Generally, which pitch direction lowers RPM?
    I remember reading the RPM amount per degree but can't recall the
    General rule and direction up or down!!
    Thank you!

  4. #4
    Top Dog Benflynn's Avatar
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    Re: Seadoo LRV engine conversion - impeller suggestions please!

    Higher pitch, lower rpm, but it’s not a rear end change, hydrodynamics of the pump make it a bit more complicated, that being said, 951 runs 7kish rpm, new engine sounds like it will do the same, seems to me they could use a similar prop, least as a starting point

  5. #5
    PWCToday Newbie 2micron's Avatar
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    Re: Seadoo LRV engine conversion - impeller suggestions please!

    Great! Thank you for the information again.
    This really helps!

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