Cooling

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Because thats the way the system works.. Cool liquid is put in the cilinder, the cilinder gives its heat to the liquid, and the liquid goes to the radiator to be cooled off and sent back to the cilinder.

Your waterpump (on the ignition side of your motor) turns with the crankshaft obviously, and not against it, so that decides which way trough the cilinder the liquid flows. Right now it can suck directly from the hose that goes to the radiator. If it was the other way around, it would have to suck all the way trough the cilinder, would cost more power, and be less efficient...well..just think and reason logically and youll figure it out im sure :)
 
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