I'm just installing a Horton elect.clutch with a 10 blade plastic fan this will move almost 2x the air over a stock fan, elect.draw is just a few amps turns on at 195 pulls it down to 165 or I can manually turn it on, there used on OTR trucks.
I have run them on my gas motor for over 2 years now...not one single complaint.
I can see how they dont make them anywhere near as large as what the stock diesel fan can do though...thats a huge unit.