Originally Posted by crystalworks

I was just going off your 10hp example. And like I said... "probably around half." Not HALF exactly. I can't give you EXACT figures.

As for durability... you may be on your original fan and clutch, but are you on your original water pump? My Volvo E-fan retrofit on my m42 has lasted 6 years... and I am still on the same water pump so far (knock on wood). Another benefit is that in the event of a failed belt you definitely slow the speed with which your engine temp rises.

You know what... it's not worth it. I'm out. If you don't think that electric parts are beneficial in this particular use case... there is nothing we can say. I mean BMW (and most other manufacturers) should fire ALL their engineers since they keep designing electric fans (and electric water pumps and electric power steering pumps) for almost all current models. They free up HP and MPG... by not being on all the time. A completely off E-fan is always going to be more efficient than even the most amount of slip on a fan clutch.

If you want to stay with a mechanical fan... that's fine. It is a perfectly good cooling solution obviously and as you stated. But why you are in here debating against the benefits of switching to electric I just don't understand.