Thanks Bart! That question has popped up a few times but i think its not as complicated as people think. Its a water cooled engine so it shouldn't matter to much, the 2nd set of vents mid way up the bonnet are designed to drag hot air out the bay so there will be some movement, granted not a lot. As for the turbo again it is also water cooled, think about putting a turbo blanket on a turbo, you then also block off any air circulation, but the turbos don't seem to mind.Love your thinking and upgrades Jack !
Wonder what happens to turbo and engine temp with less airflow, interesting and surely following your progress 😊