Quote:
Originally Posted by churchx
VeloxEric: can you elaborate on "No shroud is more efficient at high speeds"? I'm trying to think as to why >30mph with shroud might be less efficient. More drag? But will difference be noticeable of 10x10cm passing by sides of rad via very unstreamlined surfaces/parts or if everything goes through rad fins? "too much cooling" from ram-air? But then imho that will just mean that thermostats and ecu controlling fans will deal with that by closing big loop sooner or working less fans ..
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I'll do my best to answer this as I don't fully understand everything you're asking due to different languages.
Shrouds block radiator core face on the back side. This creates high-pressure post radiator, which reduces the amount of airflow through the radiator at high speeds. Reduced airflow generally means a reduction in heat rejection, while the ultimate goal is to increase heat rejection.
Fans are used to supplement airflow at low speeds with a properly functioning cooling system. Airflow above 30MPH is higher/faster than what fans are capable of pulling through the radiator.
Thanks,
Eric