ELectric Fans on a Cummins ?

I'm not necessariy planning to do it and my cooling works fine. But I've watched the debate over electric fans evolve over the years and lots ofpeople are doing it on big blocks even though armies of people say it's a horrible idea.

Over on the Cummins Forum it seems to be about performance but here I figure I'd find people who can answer the towing and MPG question.

hertfordnc wrote:
For $600 or so FLex a lite makes a fan kit for the CUmmins 5.9

Anybody using it?

is there a noticable MPG gain running empty?

Does it work well enough to cool the truck when loaded?

Why are you wanting to do this? Is there something wrong with your factory cooling?

Haven't checked them in while....but back then they were NOT recommended for big blocks and big diesels

Bet they now have enough HP to pull enough CFM...but that would mean higher electric power from the alternator

Works for cars, but for towing heavy...you have to make sure the whole system is capable...ie the alternator and the protection circuit (fuses, switch, relay, etc) are sized for the higher power

PS...the alternator ratings are for a duty cycle. Meaning a 100 amp @ 40% duty cycle is only good for that 100 amps for 40% of some time period....then the rest of that time???very little current???else damage the alternator