Hydraulic cooling fan?

[rslifkin]

Fortunately for me, the factory e-fan in my Jeep is just a slightly modded version of the Taurus fan (around 4000 cfm on high). The only single that beats it (AFAIK) is the Mark VIII fan at 5000 or so cfm. In my case, single is much better than duals, as the radiator is reasonably square-ish, so the shroud is pretty effective.