Quote:
Originally Posted by Air-Hybrid
If you insulated the engine bay completely (you'd need to manufacture new cowling to pipe the air exiting the rad) the header and exhaust heat would quickly raise the temps around the engine and then the coolant system would need to deal with quite a considerable additional thermal load. And even if the car was driven gently the extra need to radiate heat via the coolant through the radiator would not do anything but bad things for efficiency, and may still boil the coolant.
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Entirely agree, but wouldn't it be easier to seal off the entire engine bay area, and just add and appropriate cooling air exhaust at the rear bottom of the engine bay to open and release heat, as well as allow airflow through the radiator, than it would be to add another complete cooling system as a heat sink.
Eg when warming up all vents closed, engine warms up very quickly, once warm, vents open as much as required, then when stopped and shut down, all vents close and retain engine heat, when re started and running vents open as much as required.