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Old 05-23-2009, 08:19 AM   #1
SR1 OP
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VERY hot weather coolant?

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).
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Old 05-23-2009, 08:24 AM   #2
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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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Old 05-23-2009, 09:09 AM   #3
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I've had good luck desert racing in Southern California using Engine Ice

http://www.engineice.cc/
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Old 05-23-2009, 09:23 AM   #4
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Distilled water and Water Wetter.

The Water Wetter reduces the surface tension allowing better heat transfer.
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Old 05-23-2009, 09:30 AM   #5
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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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Old 05-23-2009, 09:43 AM   #6
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Quote:
Originally Posted by SR1
I'm not sure if Water Wetter is attainable here. Is running straight water long term really "bad" for anything?
Yes it will corrode the cooling system. Anti-freeze is also anti-corrosion.
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Old 05-23-2009, 09:56 AM   #7
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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).
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Old 05-23-2009, 12:02 PM   #8
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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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Old 05-23-2009, 02:11 PM   #9
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This waterless coolant will work www.evanscooling.com
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Old 05-23-2009, 03:37 PM   #10
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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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Old 05-23-2009, 06:14 PM   #11
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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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Old 05-23-2009, 06:27 PM   #12
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Quote:
Originally Posted by lightfighter
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)
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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Old 05-23-2009, 06:37 PM   #13
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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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Old 05-23-2009, 06:39 PM   #14
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Quote:
Originally Posted by lightfighter
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.
If it has a pressure cap it is a closed system.
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Old 05-23-2009, 08:39 PM   #15
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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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