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Most likely allows it to run at lower speed. . . (archive)
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Posted by John N. on June 25, 2001 at 00:04:26:

In Reply to: Saw something interesting... posted by MikeG on June 24, 2001 at 20:50:29:

My guess would be that you can more easily change the drive speed of the alternator when you don't drive it on the engine. If you're not doing night-time racing, you don't need much of a charge going into the battery (except for the rules you could probably live without an alternator altogether for most sprint races).

The lower driven speed probably makes a slight (very slight) increase in efficiency because of lower frictional losses.

John N

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