Quote:
Originally Posted by djwishbone
I don't think you answered this question, I apologize if it's a repeat.
You mentioned one of your fans shutting down due to heat and I noticed in one image it looks like you're shielding the back of the fan from the manifold. Is this a concern for those of us in hot climates (like Phoenix) and trying to make sure we maintain good working AC in heavy slow traffic. It's one of the concerns I have with a top mount turbo and the small fans most seem to use to make space.
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Why the fan shut down:
SPAL fans have a shut-down temperature. They can and will overheat if used in hot environments and shut down temporarily. I *believe* mine shut down due to the rapid increase in coolant temps about 45 minutes into a traffic jam in 115+ ambient degree temp.
This was likely a combination of rather hot air passing through the radiator (coolant temps were around 200 before spiking to 212), the fan running non-stop for 45 minutes, and the exhaust manifold being within 1/2" from the rear of the fan. I'm not worried about it happening again, I don't think it will to be honest, it was just the perfect storm and yet the radiator still kept the engine cool.
Maintaining good coolant and AC at low air/road speeds:
This is where a shroud and good fans really come into play. However, a lot of the fan shrouds on the market have
low profile fans. These units are really bad at pulling airflow through a thick cooling stack. Fans pull a certain amount of airflow at certain pressure drops. Low profile fans really stink at pulling through higher pressure drops, which shoving a thicker radiator and CAC out front definitely increases pressure drop. High profile fans have the power to continue to pull large amounts of air through the cooling stack through this higher pressure drop.
Your eyes are probably rolling back into your head at this point, it's not an easy subject to inform people about without diagrams and working through a case. It's on the long list of possible blog articles, we'll try to get to it sooner than later.
Thanks,
Eric