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Best way to get the shroud designed is to use temprature tape bits on all the important positions of an engine. Only with these small bits you can get a safe shroud and air at the points, where it is needed.
Even if a 4-cylinder engine is no 6-cylinder, even if the air amount is higher through a Porsche fan, it depends on the way, how you gear the fan and how you route the air through the shroud. There is no "OVERCOOLING" when you do it correctly!
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