Fuel Saver Alternator

Yes I just put one on as well but couldn't say if it saves fuel or not. What voltage range does yours run at? This one of mine runs 14.1 to 14.4.

 

I upgraded to a bosh 200 amp long haul extreme. MPG seemed to go up by .2 or so. Truth is replacing a failing alt in general could cause mpg to go up a little.

 

I'm not sure that this will save fuel.
The reason is that the only reduction in drag will be from elimination of where the brushes contact the commutator.
Brushes are usually a carbon graphite substance with a very low friction coefficient and the contact area is small and with low pressure and therefore little drag.
I assume the brush less alternator uses induction rather then the physical contact brushes to convey the electrical power from the rotating armature to the stationary electrical outlet.
This is a less efficient means and thus would more then negate the gain in efficiency from removing the friction from the brushes.
I could just be guilty of being skeptical or perhaps there is new technology I'm not aware of but those are my thoughts.
We used brush less alternators in the 80's in flameproof machinery.
They were less efficient in converting mechanical energy to electrical then std alternators.

Please let us know what your experience is.

 

http://www.delcoremy.com/Blog/May-2012/The-Brushless-Alternator-Advantage.aspx

http://www.delcoremy.com/Alternator-Models/36SI-HP-Heavy-Duty-Brushless-Alternator.aspx

The way I understand all this is that the fuel saving/increased efficiency is a result of varying the output. The brushless design seems to contribute very little, but adds to longevity so saves in replacement cost. But then what I know about electricity could be written on the head of a pin, with a felt pen.

 

The resistance from the electrical field is what robs power. If you want better mpg by choosing an alternator then get the lowest amp one you can find. 135 amp maybe.

And keep your batteries fully charged. I hate to agree with Dice but graphite brush drag is practically too miniscule to measure.