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  1. #1
    Gone in 3.0 seconds... RXPT400's Avatar
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    Thermostat Question???

    What are the advantages and disadvantages of eliminating the thermostat from the housing and running without it? Would it be like running an open loop system since all the coolant is always circulating through the system?


  2. #2
    No, it would still be a closed loop system. an open loop system uses sea water circulated thru engine and exhaust to cool.
    disadvantage: engine would not reach or remain at normal operating temps and depends on where you reside, if the water is very cold, it would run to cool. The ride plate is the heat exchanger in the SD closed loop cooling system.
    If your ski is modded or you would like to run a bit cooler, install the 158 degree RR thermostat assy. no fuss no mess, just bolt it on... (well other than draining the system and getting antifreeze in the bilge)
    running cooler with the RR thermostat is another failsafe to help prevent detonation. (ping)...PR...

  3. #3
    David 1 FAST VE's Avatar
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    No open loop means that you use outside water to cool and not antifreeze going through the ride plate.

    If you remove the thermostat it will still be a closed loop system.

  4. #4
    Gone in 3.0 seconds... RXPT400's Avatar
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    I was curious because like in cars when you want your engine to run cooler people eliminate the thermostat to lower the temp's on the engine since coolant is always circulating through the coolant system.

  5. #5

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    Quote Originally Posted by RXP300 View Post
    I was curious because like in cars when you want your engine to run cooler people eliminate the thermostat to lower the temp's on the engine since coolant is always circulating through the coolant system.
    On vehicles removing the thermostat will not always lower coolant temps. Sometimes removing the thermostat doesn't allow the water to stay in the radiator long enough to cool it. Thermostats are used for a reason.

  6. #6
    That might have been the old days in auto`s and even still that was either good or bad. If coolant circulates to fast it doesn`t have the chance to absorb heat and carry it to the radiator to be cooled by air, air to water exchanger.

    same thing applies with the closed loop, if the water flows to fast or to slow, there is nothing to regulate the speed of, or flow of coolant to the oil cooler, the cylinder head, engine block, etc., there would be hot spots in certain areas. thermostats are also important upon start up by by-passing coolant and closing certain paths to allow the engine to heat up quicker.


    also look at the open loop systems used in the GPRXP conversions. The guys creating and using these types of systems use a type of valve to control flow from sea water to maintain a good engine temp...PR...

  7. #7
    Gone in 3.0 seconds... RXPT400's Avatar
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    Thanks guys that answer my question?

  8. #8

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    It also does NOT route enough coolant to the oil cooler.

  9. #9
    Quote Originally Posted by jawz View Post
    It also does NOT route enough coolant to the oil cooler.
    I wonder if HOSS knew that , he`s running no stat...PR...

  10. #10
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Pale Rider View Post
    , he`s running no stat...PR...
    Not anymore. He learned the hard way.

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