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Originally Posted by verbeekb
The 964 and 993 have an additional fan on the front of the alternator, probably to aid alternator cooling, ...
Brian
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Hi Brian,
I don't believe the little (radial)additional fan is for cooling the alternator. The alterator is cooling by the fan itself on the front through holes around the pulley. No, I think the little radial fan is meant to distribute the air more evenly left and right! Thats why the C2 or 964 fan hasn't got a cone at the back like the old 11-blade fans had.
The special fan housing of the 964 assembly makes sure the air comes out straight ahead instead of curved more to the right (bank 1 & 2), like the old han housings did.
It took a pic of the 964 fan housing to illustrate this:
I also put up the pic at STF, but since no one else seems to use it, I'am sure you can maybe more relate to my above story
Best regards,
Walter