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  1. #1
    Mighty Mouse's Avatar
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    Why does cooling go to exhaust first?

    Doesn't it seems strange the cooling starts at the exhaust manifold then go through the pistons and head? I am sort of new to this but wouldn't it be better to cool the head down to piston and out the exhaust. Just my thoughts.

    Also when it leaves the head it goes into the exhaust elbow. Does the whole elbow fill with water or just part of it?

    One more question guys. At what point does the watter/exhaust meet? In other words does it stay separate until it meets muffler or pass the muffler?

    Thanks.


  2. #2
    powerstroke specialist mikegp's Avatar
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    why are you worry about this? I'm sure engineers from Yamaha spend quite few months to figure that out.lol..
    the whole elbow fills with water.
    it meets at the water box.

  3. #3
    mudslanger's Avatar
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    Quote Originally Posted by mikegp View Post
    why are you worry about this? I'm sure engineers from Yamaha spend quite few months to figure that out.lol..
    the whole elbow fills with water.
    it meets at the water box.
    Also the water has to come in through the bottom of the cylinder or exhaust manifold water inlet and out the top to keep air pockets from forming in the top of the cylinder heads that could cause the engine to over heat. the head gasket meters the water flow to regulate temp, kind of like a thermostat with the center removed.

  4. #4
    PolarisNut's Avatar
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    Some do run reverse cooling, but it has its draw backs too. The way the stock cooling system is, is actually pretty good for even heavily modified motors. The water doesn't meet the exhaust until the very end of the pipe (stinger), just before it enters the water box.

    The cooling system isn't nearly as picky as it is on a recirculated system (auto type system), since it is continually pulling in fresh, cool water. There is obviously a much larger temp differential between the cylinder/head temps and the cooling water.

  5. #5
    2 strokes also run better if they are hotter, if they run "cold" they normally idle chunky, if the water flows through the exhaust first then the cylinder then it gives the water a chance to warm just a little bit and which would keep a bit more temp in the cylinders, making it run smoother. thats what i think anyway

  6. #6
    Tommy Pantsdown's Avatar
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    The laws of thermal dynamics rule over how it's cooled. Colder water doesn't equal greater heat transfer all the time. There's more at play then that.

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