Quote:
Originally Posted by 72911
the smaller diameter allows the fan to turn faster which can't be bad on an AC car
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A smaller diameter drive pulley diameter causes the the driven pulley (compressor or fan) to turn slower.
The Factory PN for the 2 groove pulley is 911-102-015-50.
Typically the compressor belt groove these cast crank pulleys of this era were 4.5" nominal.
There are a few variations of these pulley's you can find from that time period, some have different mark locations, for example, for mechanical injection possibly. And, some of these early cast pulley's could be found on VW's.