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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
why dont 2 strokes use thermostats?
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[QUOTE="Buckholz, post: 277950, member: 17671"] Entertained by yawls discussion. First, my last four dirtbikes have had thermostats. Thats 3 KTM 380s and one XR650R. The XR's thermostats are defective from the factory and fail half open. No thermostat problems in the three KTM's. My two stroke snowmobile also has a thermostat. My background is as a MechEng with specialty in thermal science. My learnings, feelings ,reading, and experience had led me to believe that less restrictions and more flow is always better. Lots of arguments with buddies,.... Wrote Kevin Cameron (of Cycle World Tech fame) and he confirmed that more flow always transfers heat better.... except in one case. That is if flow rates lead to cavitaion where the coolant "pulls away" from the tubes and or the impeller ends up cavitating (read about in submarines books) and reducing flow. BTW, the right KTM radiator is thermostatically controlled. In my owners kit from KTM, a goofey black plastic piece was included. It exactly matches the left radiator so one can use it for completely blocking off flow. And yes, at 7,000' elevation, there are times when we need to block flow in high speed operation. And my KTM380 will sit on the sidestand and idle for 10 mins during warmup. [/QUOTE]
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Dirt Bike Mods & Maintenance
why dont 2 strokes use thermostats?
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