Coolant flow

72bluNblu said
If you think an electric fan on the backside of a radiator is going to reduce airflow more than the resistance from the radiator itself, you weren’t paying attention in your fluid dynamics class.

If you put a big flat pan on the back of the radiator like some of the poorly thought out aftermarket electric fan shrouds you can cause issues. But the fan itself isn’t a problem, and neither is a well designed fan shroud.

The idea that you have to run a mechanical fan for best cooling is antiquated at best.

Re-read this part:

12many said
no flat shroud and/or electric fan that has a bulky blade blocking air flow, a good mechanical fan, (fixed or viscous) as big as you can fit

I speak from my experience in particular regarding an electric with a flat shroud w/bulky fan blade impeding airflow. Packing up. There’s much about that exact problem on this forum.

The one I had worked great at slower speed, stop and go, but I had to run it continuously always so as not to run past 215° at highway speeds, (it should have been designed better with vents on each corner with flaps) but one time the temp went through the roof when I had an electrical issue and the fan wouldn’t run but luckily I was able to ease it home. Out it came for a mechanical setup as the possible minor gains at the drag strip just wasn’t worth it on the street in my case.

Yes, a well designed shroud and electric fan wouldn’t be a problem. I never implied otherwise. And I never said anything about having to run a mechanical fan for best cooling either.

Not sure what your post is all about. :)