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Originally Posted by JAMESZ
What model Z is this? Before the Z32 all of the clutch fans ran straight off the belt and stayed at the pulleys angular velocity. I won't get into the trig but it should be at the same angular velocity as the pulley and should never change on anything older then the Z32.
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They tend to , yes , but they coast a bit and generally lag behind the pulley in overall rpms , especially during acceleration. But after the silicone heats up , it's definitely a 1:1 ratio , or at least it should be. I'd say it's a statistical impossibility for him to have gotten 2 bad fan clutches in a row , so something else must be wrong here.