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  1. #1
    Kiwi spanner handler
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    open cooling operating temp

    What temp are you guys getting with open cooling kit on stage 3+ rxps I just looked up on buds and ours is running a max temp of 148 degrees according to the ecu temp sensor which i thought was a bit cold?
    We plan to measure at head outlet and try to restrict outlet to alter temp a little but wonder what temp to try and achieve
    Any thoughts?


  2. #2
    Hydrotoys's Avatar
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    160. Restrict inlet, not outlet... and just barely.

  3. #3
    Site Admin Green Hulk's Avatar
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    I agree. Try to get at least 160 degrees operating temp.

  4. #4
    ROTAX RACING performance
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    open loop cooling temperature should be around 55 °C ( 130 F), that is the best temperature to make power, and the factory ROTAX RACING engine run that exact temperature 50-55 °C, if you run slighly higher it will not be a problem

    the oil temperature needs to be 85°C -90°C (185 F-190 F) !!!!!

  5. #5
    fabrication guru rapidacceleration's Avatar
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    i keep the RXPL and SUV around the 140-160 range.
    autometer ultralight makes a nice electronic gauge from 60-210 range.
    we put a brass ball valve on the inlet side for adjusting. really only adjust it like 3 or 4 times a year. mostly due to the change in lake water temps.

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    the new rotax racing closed loop thermostat is much lower than 160, so why not run the open loop at a comparable temp to the closed loop rotax racing thermostat? malte... the new thermostats are 55 celcius right? 130 degrees F
    Last edited by Shibby1485; 03-05-2008 at 09:27 AM.

  7. #7
    REID2168's Avatar
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    Quote Originally Posted by Shibby1485 View Post
    the new thermostats are 55 celcius right? 130 degrees F
    yes they are i have two and just read them!

  8. #8
    ROTAX RACING performance
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    Steve, yes the new thermostat are 55°C but you will never have 55°C with a close loop system, more like around 70°C.

    but the advantage of a openloop is to run lower temps then with the closeloop & 55°thermostat.

    @ all, engine temperature is not a question of favor, tast or opinion !, it is a question of results !

    ...................but higher temperature are better for the engine life
    Last edited by mrracing; 03-05-2008 at 10:26 AM.

  9. #9
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by mrracing View Post

    ...................but higher temperature are better for the engine life
    Exactly!

    For all intents and purposes 98% of the people here are rec riders and wan't their engines to live a long time. Proper operating temp for any 4 stroke internal combustion engine is going to be in the 175 degree range. Yes running it cooler than that will make more power but it is detrimental to the life of the engine.

  10. #10
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Exactly!

    For all intents and purposes 98% of the people here are rec riders and wan't their engines to live a long time. Proper operating temp for any 4 stroke internal combustion engine is going to be in the 175 degree range. Yes running it cooler than that will make more power but it is detrimental to the life of the engine.

    With that being said is the Riva thermo or in my case the Rotax thermo going to shorten the life of my engine? If so not good.
    Last edited by skoepp; 03-05-2008 at 03:08 PM.

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