Water pump impeller styles?
I have a few 7 blade fans but no Fjord clutches... What makes them different?
What application?
Well for starters it lasted a wholtsa years
But if you get a chance to see/hear one in action, it's fliping amazing. The Ford has a huge fan on it, and when it comes on line, it's like a hurricane under that hood. I just figured with my lessor fan, that clutch would last forever. And so far it's done good.
I can't talk about Mopar clutches, except to say that
MINE never acted like this, seeming to run way to long after the start up, and a good percentage of mine, either gave up or leaked. Your experience may vary.
I just want to add, that if you can get your cooling system to run a steady temp with very little variance, then you can put an on-the-ragged-edge tune in it, and not worry about detonation when the temp goes up........cuz it never goes up! And so you can explore the edge of max cylinder pressure. And/or you can tune for a faster-burning gas.......like 87E10, which every body affectionately calls skunk pee.
I know, I know, another 5 or 10 psi of cylinder pressure,most street guys won't chase. To bad for them. I run over 180psi with aluminum heads, and others claim over 200psi . In a 360 with a typical street cam, this makes BB-type, low-rpm, torque.........which in a stick car, is dynomite!
I bet a guy could put al.heads on a street-teener and jack the pressure to around 200, run a small cam, and make better low-rpm torque than a hot iron-headed 360, and a bonus would be a nice fat juicy midrange,that's what I think.
Now if you wanna run an electric-fan set-up, with a 10* or more hi-low setting, go ahead...........lol, but I'd be willing to bet there is more power-loss in the temp-swing than in my system.