Thermostat or not?
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Thermostat or not?

  1. #1
    Senior Member Lildave's Avatar
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    Default Thermostat or not?

    My Mantra has no thermostat, and runs about 120 degrees. There is some type of valve at the beginning of the supply line coming from the pump to the engine. I'm guessing it's a pressure reducer, but I'm still new to all of this. I've read until I'm cross eyed all of the arguments about how to run your water lines. It seems like it'd be better on the engine to run at 180 or so. I've looked at the thermostat kit on Rex.

    Should I put a thermostat in it? If so, what kit do you like?

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  3. #2
    Member 07warhawktx19's Avatar
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    Quote Originally Posted by Lildave View Post
    My Mantra has no thermostat, and runs about 120 degrees. There is some type of valve at the beginning of the supply line coming from the pump to the engine. I'm guessing it's a pressure reducer, but I'm still new to all of this. I've read until I'm cross eyed all of the arguments about how to run your water lines. It seems like it'd be better on the engine to run at 180 or so. I've looked at the thermostat kit on Rex.

    Should I put a thermostat in it? If so, what kit do you like?
    We dont run a thermostat in any of our jet boats.

  4. #3
    Senior Member TNYoungblood's Avatar
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    None here either. Use the gate valve off the pump to control the temp
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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  6. #4
    Senior Member Mash on It's Avatar
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    FWIW,
    Lake temp + 50* to 60* = engine temp
    75* + 50* = 125*
    In a single pass system.
    Adj with Gate valve.

    Daniel
    Mash on it

  7. #5
    Senior Member Lildave's Avatar
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    Sounds good to me... So I just need to close that valve off some, and the temps will raise. What should it run at? 160? 180?

  8. #6
    Senior Member TNYoungblood's Avatar
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    I like to be able to idle @ 180* , you get that right and there aint to much you can do when runnin down the lake, you might be 125 to 150 .. As the water warms up you might have to open the valve to keep the 180* .. But set er at idle and you will be ok
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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