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  1. #1

    Closed loop vs open loop cooling-What's better

    I'm trying to get more top speed from my ski and was thinking about changing the stock ride plate to the Riva one. I see that it requires the open loop cooling system, but I don't know anything about, is it worth it? Help!


  2. #2

    Join Date
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    I have open loop on two rxp's and love it - way less heat in the motor area and so much cleaner and easier to work on

    Make sure you have a good strainer also - Others have great luck with the modded or Riva plate - I haven't really seen any gains.

    Happt Riding

  3. #3
    Do you think I would get a little more power if it's running cooler. Forgot about the strainer...definitely going to get one...

  4. #4

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    There is notible less heat soak so you will maintain power longer - can't really say you make more power - but it doesn't fade during a long pull or ride

  5. #5
    SLASHER's Avatar
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    I run both , but with open loop it's hard to keep the temps from spiking in cooler water ...

    This can cause the block to walk a bit when the thermostat opens letting cool water in ...

  6. #6
    West Texas RXP skoepp's Avatar
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    Try the search.
    There are several threads discussing this topic.
    You need to throw in heat exchanger closed loop setup for comparison.

  7. #7
    Mtuned's Avatar
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    If you want a great setup, Check out my Trade thread

    http://www.greenhulk.net/forums/showthread.php?t=187132

  8. #8
    boost junkie skidoochris's Avatar
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    Just remember the motor was not designed for open loop with cold water
    my 30 plate HE and 160 t stat never got above 170 at idle and it allways stays at 160 at wot
    the hotest lake temps here were only 85f
    so for FL a 40 plate should even keep it cooler at idle

  9. #9
    Moderator Snoman's Avatar
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    Ive run both, BUT i ran my open loop when it first came out..When it first came out there was no thermostat to regulate temps so we used gate valves to do this...there were issues with thermo shock,Gas in oil and wide spread temp swings..NOW with the thermostat that is being used,from what i have read and been told,the open loop isnt as much of an issue as it was in the past.Chris is right though,the Seadoo engine has tight clearances and if you run in cold water temps and bring that cold water into a hot engine you still may experiance some thermo shock to your block and pistons..NOW i can also tell you after taking my engine apart recently i will say the open loop/river water ate up my water jacket some,i had lime scale and crap all in and around the jugs and water pump on the PTO cover...I recently converted back to the closed loop system Via a heat exchanger and i can tell you i can not tell any difference in power running the heat exchanger VS the open loop...I do know that you do want to keep your engine temps around 160-175 degrees though as the ECU recognizes cooler temps and adds/subtracts fuel do to the temp differences.....IMO the closed loop system is the way to go,especially in salt water and colder water temps....But again,this is just me and my findings....

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  11. #10
    Vern's Avatar
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    Agree with Snoman ... I have run a 30 plate heat exchanger for two years now and had zero issues. Works great, keeps temps steady, still uses antifreeze and thermostat and yet allows you to do anything you want with rideplates.

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