On or around Tue, 29 Nov 2005 13:10:12 +0000 (UTC), "Badger"
<brianhatton@btinternet.com> enlightened us thusly:
>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.
I'll add my pennorth here an' all.
on the 110, when I put the original V8 in, it was a P5B engine with a
well-bent fan, and since I had a leccy fan anyway, I kept it. One hot day
the leccy fan motor gave up and siezed.
after that, I looked around in the shed and found a fixed fan to bolt on the
engine. Very littel to go wrong, and the only thing it does is waste a
small amount of power spinning when it doesn't need to.
Viscous fan should psin for the first 30 sec or so, (you will hear it at
moderate revs) and then spin down to idle unless it gets too hot. Provided
it works, it's very effcetive, and they seem to fail most often into "stuck
on" mode, which is a bit noisier and less efficient but at least doesn't
overheat the engine.
--
Austin Shackles.
www.ddol-las.net my opinions are just that
Blue: The sky is blue for a reason. Blue light is a source of strength
and harmony in the cosmos. Create a blue light in your life by
telephoning the police
from the Little Book of Complete B***ocks by Alistair Beaton.
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