Thanks for the photos, they appear to be very revealing! I wonder if Boralogist and I are thinking the same thing: - If that scoop was mounted where those steel pipes are pictured, below your radiator, with the opening facing forward ----> no wonder your radiator couldn't cool the engine. Mounted in that fashion, the scoop would be pressurizing the low pressure zone behind your radiator, preventing air movement. That scoop should be installed with the opening facing BACKWARDS to EVACUATE air from, and maximize the low pressure zone at, the back of the radiator. Let us know if my assumption how the scoop was oriented is correct. Cheers, - Art PS - I've enjoyed Perth and Freo for the America's Cup races. Very fun time.