puffernutter <peter@puffer-nutter.co.uk> uttered summat worrerz funny
about:

Yup I found no difference, Just quieter running. Other than that a waste of
my time.

Lee D

Do a search for recent articles, this has been discussed at length on
various occasions. My personal opinion as an engine builder is that
electrical fans promote thermal instability (constant cycling) within the
cooling system, something definitely to be avoided with a V8, more so with
the 3.9 and larger due to block issues, and are next to useless compared to
a properly working viscous setup. The fuel savings are so immeasurable as to
be non-existant.
1. A viscous fan only draws power from the engine when it is required to
lock up and cool. At other times, it consumes virtually no energy.
2. It is a direct mechanical drive with very little energy loss, only a
miniscule ammount is lost to heat.
3. An electric fan has at least 2 energy conversions, mechanical to electric
to mechanical, with heat losses at each conversion stage.
4. The electric is less reliable, I know of more motor failures than viscous
coupling failures.
Just my tuppenceworth.
Badger.