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Canadian Daves JustKDX
overheating
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[QUOTE="yotamotive, post: 1056140, member: 68821"] [b]Alternative to Evans?[/b] I too had a 2003 220 that overheated during slow moving high output situations. I looked into EVANS NPG and think I may have found a cheaper easier to acquire product. Per EVANS web site their product is 99% propylene glycol and 1% additives with a boiling point of 369 degrees Fahrenheit. Sierra Antifreeze is (per it's MSDS, material saftey data sheet) 96% propylene glycol, 3% water, and 1% additives with a boiling point of 365 degrees Fahrenheit. You can buy Sierra at your local autoparts store for less than ten bucks. The only difference being the 3% water resulting in the 4 degree boiling point difference which seems to me to be negligible compared to conventional 50/50 water/ethylene glycol with a much lower boiling point (264 degrees F). Boilover is a result of cylinder wall temperatures reaching the boiling point of the coolant. Once boiling begins a small pocked of air is created on the backside of the cylinder wall where the coolant resides. The lack of coolant in this area causes even more heat to be created because the coolant can no longer remove the heat from that spot due to lack of contact. So this small problem begins to create a larger chain reaction finally resulting in the boilover we all know too well. The idea behind products like EVANS and Sierra is by using only propylene glycol it increase the boiling temperature thus eliminating boilovers. An engine that runs hotter is not necessarily a bad thing, temperature differences (like during a boilover: air pockets-hot, coolant-cold) cause engine damage. Most important is that an engine remains at a constant (not necessarily low) temperature throughout, within reason of course. Thats the way I understand it at least. I currently use Sierra and it works great, no more boilovers. Just my .02. Hope I have helped a little.............. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
overheating
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