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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
why dont 2 strokes use thermostats?
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[QUOTE="Sage, post: 229652, member: 22484"] Ok, with all being said please explain the following- "The pressure cap is there to prevent boiling after the engine is turned off" Why don't "MOST" MX bikes, snowmobiles, a t v's, road race bikes use a coolant over flow tank and why can I shut off a hot MX or Road race 2 or 4 stroke bike and not have it over flow? If the cap is for pressure relive after the engine is shut off then in theory all the machines listed above should leak coolant after being shut down while hot. "Water flowing too fast too draw off heat??? That is complete bull****! Faster moving water cools just as well as, and often better than slow moving water. " Please explain how a faster moving xxx will transfer heat better? If you look at anything - air, water, fire, etc......, it will transfer more temperature at a slower speed, if you move a given amount of xxx across a given amount of space at different speeds it will effect the heat transfer, look at heating & AC, if you have your heater core at say 150 deg & your fan on high the air will be cooler than if your fan is on low, why? Because the air going through the heater core is moving faster with the fan on high and can't transfer heat as good. Move you hand over a propane torch slow and then fast and tell me which hand speed transfers heat more effectively? "However the cooling system is a closed loop, so if you are keeping the coolant in the radiator longer to allow it to cool, you are also allowing it to stay in the engine longer, which increases coolant temperatures" Thus the reason for a "tuned speed" for coolant flow, too fast not good enough, too slow not good enough. Back to my original post - Most 2 strokes are purpose built and the coolant speed has been engineered into the system via the size of the radiators, speed of the coolant & cap pressure rating. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
why dont 2 strokes use thermostats?
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