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you could learn from a beetle/912/914 or even the early 911 2.7-3. something flat six.
I wondered why they had air pumpin backwards through a shroud over the heads, tightly fit.... it is for homogeny. This goes way back to the orignal beetles, called tatra.
unlike liquid, air cooling needs some thought to gain the same consistent rutnime.
there is more ways than one to ship the heat out... but as air cooled goes, it needs protection at the same time, for consistent runtime.
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