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  1. #11
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    Re: SXR 1500- how hot is too hot?

    Quote Originally Posted by Benflynn View Post
    4t burns less fuel the less u heat the cooling water. All heat soaked away is generated by burning fuel, less taken away, lil less fuel used. Old lt1 w/reverse flow cooling run pretty hot, always seemed wrong when u popped the hood
    you mean to say 4t burns less fuel the warmer the water/engine is right?

  2. #12
    PWCToday.com Is My Home Away From Home bbigfish's Avatar
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    Re: SXR 1500- how hot is too hot?

    Quote Originally Posted by Grumpy Old Guy View Post
    Kawi dumps all the cooling water into the muffler & the fittings are very restricted to keep the motor very hot.

    On 15Fs we sometimes have to open up the exit fittings in order to let the water flow out & let the motor run cooler. What happens is the ski will run fine all day long & then when they drop down to idle the water pressure drops & the water in the motor starts to boil & then it starts shooting stem out the pisser.

    This is in Fla where summer water temps are 80-90 already. All my experience is with the sit downs but I am sure Kawi has done nothing to change it in a standup.
    My service manual shows the water routing and most of it goes to the exhaust as you said. Water is hot in Houston too. I plan to purchase the r&d cooling system.

    Thanks for all the input.
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  3. #13
    Frequent Poster
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    Re: SXR 1500- how hot is too hot?

    Have you seen how hot late model car and light truck engines are made to operate at?

    I remember 140 thermostats in the '60s and early '70s cars. We thought a 190 was excessive...LOL.
    '16 Seadoo GTX155 / depth finder and ski mode module added
    '17 Kawasaki SXR 1500

  4. #14
    Frequent Poster Sev1n's Avatar
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    Re: SXR 1500- how hot is too hot?

    it gets too hot when it beeps and shuts off

  5. #15
    Top Dog Benflynn's Avatar
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    Re: SXR 1500- how hot is too hot?

    Quote Originally Posted by restosud View Post
    you mean to say 4t burns less fuel the warmer the water/engine is right?
    Yep, or the less heat u are bleeding off. Put a 160 thermo in it will use more gas than w a 190.

  6. #16
    PWCToday.com Is My Home Away From Home don37725's Avatar
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    Re: SXR 1500- how hot is too hot?

    Quote Originally Posted by restosud View Post
    you mean to say 4t burns less fuel the warmer the water/engine is right?
    The more heat you can keep in the motor the more efficient - The balancing act has been how to control that high heat without leading to engine damage / detonation - Legendary Nascar race car builder, engineer and Character, Smoky Yunuck knew more about cheating than the next 10 mechanics/builders - He worked for many years on a motor, adiabatic engine, that retained so much heat it was super efficient - GM, Ford, Chrysler wrote him checks to help fund development - He held a few patents on his work but his motors never made it into production. He managed to get 150 Hp and 60 MPG out of a 78 ci. 2 cyl motor, almost 2 hp per cubic inch, at a time when 1hp per ci was considered high performance - Very interesting guy and character who unfortunately is no longer with us - I suspect he is showing St Peter how to get soup up clouds.

    http://rexresearch.com/yunick/yunick.htm
    Last edited by don37725; 07-07-2017 at 11:14 PM.

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  7. #17
    PWCToday.com Is My Home Away From Home bbigfish's Avatar
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    Re: SXR 1500- how hot is too hot?

    Interesting read!
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  8. #18
    Top Dog Benflynn's Avatar
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    Re: SXR 1500- how hot is too hot?

    You would think they would be better at harnessing the lost heat. F1 have a mgu-h(motor generator unit-heat maybe) I think they call it, a generator hooked to turbo shaft to produce power off the turbo over rev. I imagine instead of opening a waste gate to divert ex around turbine, they place a load on the gen and drag the turbine speed down, controlling boost and producing elec.
    Last edited by Benflynn; 07-08-2017 at 01:12 AM.

  9. #19
    PWCToday.com Is My Home Away From Home bbigfish's Avatar
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    Re: SXR 1500- how hot is too hot?

    Temp on cases and cylinder only 198F after hard run. Looks like I am ok.
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