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They are functional. Air comes in underneath and through the radiator past the engine and out the gills.
Are they that effective since there really is no clear path? They certainly are not getting direct flow through since they are blocked by a piece of plastic.
Let's hear more on this .... are our side vents like stickers on a rice mobile? If so, I'm filling mine in with Bondo. Please convince me that they have a meaningful function.
Are they that effective since there really is no clear path? They certainly are not getting direct flow through since they are blocked by a piece of plastic.
They're not completely blocked by the shrouds; it's sort of like water - if there's an opening it will find its way through, particularly when you're moving forward. Some folks who do HPDEs have additionally reported better cooling and less air pressure underhood by removing the shrouds.
I used to have a link where they had pictures of a C5-R 3d model shown in a virtual wind tunnel. Can't remember the side gills, but I do remember that the vented hood really worked. Sorry, doesn't help much, but if I find the link again, I'll post it.