VERY hot weather coolant?

Discussion in 'The Garage' started by SR1, May 23, 2009.

  1. SR1

    SR1 Back in S. Korea

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    I'm buying an F650GS Dakar this week here in Kuwait. Today the max temp was something like 48* C. A scorcher.

    While I don't expect to ride during the heat of the day, I certainly don't need anti-freeze here.

    What would you guys recommend I use, as I should flush the coolant anyway (bike's been sitting a while)? I am thinking water. Can I use tap water (here it is pretty salty, might need distilled).
    #1
  2. LuciferMutt

    LuciferMutt Rides slow bike slow

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    Straight water will have the best cooling properties but is bad for the cooling system. What is that stuff, water wetter or something? You add it to the water to be an anti-corrosion ingrediant as well as lubricating the water pump.
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  3. Strong Bad

    Strong Bad World's Foremost Authority

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  4. Jonex

    Jonex Long timer

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    Distilled water and Water Wetter.

    The Water Wetter reduces the surface tension allowing better heat transfer.
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  5. SR1

    SR1 Back in S. Korea

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    I'm not sure if Water Wetter is attainable here. Is running straight water long term really "bad" for anything?
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  6. LuciferMutt

    LuciferMutt Rides slow bike slow

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    Yes it will corrode the cooling system. Anti-freeze is also anti-corrosion.
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  7. dump-a-thump

    dump-a-thump lapsed atheist

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    In Oz we ran straight water for a year or so, as long as its distilled it didn't make too much of an issue with corrosion. However, unless you are going to be crawling around in the sand at low speeds all the time, you really shouldn't be overtaxing the system on the 650, even in the low 40's, my fan is rarely on.

    I'd make sure the rad is clean, inside and out, and go with a 20% coolant mix. It only lowers your heat capacity a tiny bit, plus gives you corrosion protection. If you find that's not enough, then wire the fan in to be live (100% run time) and/or drop a few degrees on the thermostat (or toss it).
    #7
  8. Jamming

    Jamming Desert RAT

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    Here in Phoenix I'm running Engine Ice. Seems to work fine. The fan isn't cycling off and on as much.
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  9. rbrsddn

    rbrsddn 3banger

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  10. yosmitetom

    yosmitetom Banned

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    Propylene Glycol same as Engine Ice and any of the anti-freeze you see that is pet frindly. Most of the claims are greatly exagerated.
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  11. lightfighter

    lightfighter where does this go?

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    at the risk of opening a technical debate, water boils at 212, ethylene glycol and propylene glycol blends can have boiling points as high as 370.

    so while water **may** conduct heat better(i really dont know, but i dont believe it does), it will evaporate off faster since it will be much closer to its boiling point in a water cooled engine

    my ktm(525) on straight water went 500ml down on the same ride that my kids ktm(250) lost no prestone premix.(two hours in the desert at 85 degrees)
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  12. yosmitetom

    yosmitetom Banned

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    Water in a closed system doesn't evaporate. Water conducts heat much better than anti-freeze just doesn't lubricate very well or prevent corrosion.
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  13. lightfighter

    lightfighter where does this go?

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    does the f650 have a closed system? or a catch tank? the distinction is more than semantics. running straight water in a closed system that isnt that well closed can in fact force steam out of the system.

    ive had jeeps do it, and ive seen honda mc's do it. my ktm has a catch tank, and it lost water untill i got to the store and picked up some coolant.
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  14. yosmitetom

    yosmitetom Banned

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    If it has a pressure cap it is a closed system.
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  15. roygrady

    roygrady n00b

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    Yeah its boiling off, so if you don't have the catch tank its gone, thats why coolant is better. It wouldn't be a closed system, there has to be an overflow pipe or it would be busting open pipes when overheated.
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  16. roygrady

    roygrady n00b

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    Oh yeah and I've used NPG+, works well. It will have your setup running 5-10degress hotter tho.
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  17. azcagiva

    azcagiva new orange flavor

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    I have heard of guys using jet dry, the stuff for dishwashers, as a cheap alternative to water wetter.

    -John
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  18. rapidoxidationman

    rapidoxidationman Easily trainable

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    Any of y'all smarter than the engineers that designed the bike?

    50/50 water/glycol:deal

    Use distilled water and clean glycol that's made to work with aluminum.

    Don't worry or overthink it, the problem has already been solved! Why try to reinvent the wheel??
    #18
  19. lightfighter

    lightfighter where does this go?

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    if it has a pressure cap, a vent tube and a coolant recovery tank that is big enuogh to let the steam turn back into liquid, it is a closed system.

    but the comment down the line says it all... why reinvent the wheel?

    #19
  20. LuciferMutt

    LuciferMutt Rides slow bike slow

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    Do you have regular days in the summer where temps hit 100* and over?

    50/50 doesn't work so great in those conditions, in traffic. ABQ is not as hot as phoenix but it can still get brutal out there.
    #20