[Formulajones]

Originally Posted by STEELCITYFIREBIRD

From the circle track world...
The crate engine (sealed engine) series all have the same engines so anthing that frees up power or reduces friction/drag is always being sought after.
Those engines max out at 7000 RPM. Anything riveted or "flex" fails in short order.
Fan/pump are usually driven 1:1. Front of cars are completely closed so high draw fan is imperative.

The only two viable choices are;
https://www.race-fan.com/

Crates LAtes and Super Late Models (turning 9000 RPM) usually use this:
https://gorsuchperformancesolutions....ir-6-blade-fan

YFLMV!

On a side note, my factory Ford 428CJ fan/clutch let go on me last summer, ~ @ 6K...it's over driven....
"only" junked a new OEM rad.
Haven't opened the hood since!
(not fixed)

Those are pretty interesting. The first one is similar in appearance to the OEM plastic fans used today, other than the clutch. I think those plastic blades do have a place.

I tend to believe that's why the carnage wasn't so bad on my sons mustang. Being plastic, it never did puncture the hood. I believe if that was metal it would have certainly went through. When it hit other stuff like the lower radiator hose, the shroud etc...the blades just broke off, didn't even cut through the lower hose. It was the clutch that did most of the damage, mainly to the radiator.