47-55.1 Electric fan setup?

[MiraclePieCo]

Originally Posted by Matt_50

And being low on radiator like you said... from searches, a lot of people say a fan should cover 70% of the radiator.

Is this true?

That 70% figure actually comes from the Flex-A-Lite fan page. https://www.flex-a-lite.com/blog/whi...lt-driven-fan/
It's a good policy, but I'm here to say that I'm actually running a low-mount mechanical fan with a warmed-over SBC and my temp runs a consistent 140 degrees. The outside temperature here has been around 90 this week. Looks like I may actually have to install a hotter thermostat just to get my motor up to temp!

Regarding the tired old "flex fan decapitation" stories: My flex fan is rated for vastly higher RPMs than my motor is capable of; no doubt those fans that came apart were either cheap, damaged, abused, or all three. We know they didn't have a shroud!

I've used both mechanical and electrical fans. In every case the mechanical has cooled better. Plus I take comfort knowing I'll never be stuck on the roadside due to blowing a 15-cent fuse. My fan will never stop working as long as my engine is still running.

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