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Reply to "Rounded Fan Hole"

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So, from what I'm reading, this was developed mainly for racer boys who were worried about fans flying apart at high rpm's, and it has the added advantage (for racer boys) of being lower mass and thus spinning up faster and it also cools well at those high speeds.

But most of us have the opposite concern - good cooling at lower speeds, especially sitting in traffic at idle. Any reports on how this fan does there?

My car is most likely to run warm on a hot day after the engine has been run hard and we're now slogging through urban traffic on those last few miles towards home. Usually, the engine will actually drop in temperature climbing a long, steep hill if I downshift and get the revs up. My stock fan (with welded vanes) has run with no issues for about 40K miles.

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Last edited by Sacto Mitch
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