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Maurice, that line from the top of the oil cooler is a vent to the surge tank to release entrained air from the cooler, which happens to be the highest point of the cooling system on the engine. By getting rid of the air, the laminar flow exchanger works very well; with trapped air, its thermal efficiency falls off very quickly....
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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