At 06:30 PM 7/27/2013, neil n wrote:
>So the Vanagon fan is a bit of an odd duck in that it may draw more
>current when compared to radiator fans on other 4 cylinder gas
>engines?

It's a high-speed, small-diameter fan compared to the usual.  That
means it's less efficient, all else being equal.  Have you heard the
thing running at high speed?  450 watts is six tenths of a
horsepower.  Yes, I'd say it's a good bit more than the usual for a
four-banger.  The non-A/C one is 300/200 watts.

But that's not really my point.  Every cooling fan system is
engineered to fit its own circumstances, its own design of motor, fan
blade, shrouding, engine compartment, philosophy of the
designers.  If you want to be your own engineer and swap components
from one system to another, you have to actually do at least some of
the work.  It's not rocket science but there are measurements and
calculations involved -- assuming you want the fan to keep turning at
the design speeds, and things not to burn up in the wiring.

Yours,
David