I didn't know there was such a beast!
Quote:
My replacement Alternator is fitted with a standard pulley, where the original had a clutch pulley.
The Clutch Alternator Pulley was pioneered by Audi, BMW, Mercedes, Seat and Volkswagen.
The idea of which was to reduce possibility of sudden snatch when coming down from high revs such as motorway driving to a standing stop thus prolonging the life of expensive automatic tensioners.
Unfortunately the pulley design was such that they failed after a relatively short period of time and that they are a costly service item.
QX Components has looked into the fitment of these pulleys in great detail and we now fit a standard non clutch correctly spaced pulley in place of the prone for failing clutch pulley.
This is of no detriment to the performance of the unit and if anything extends the life of a regularly replaced OE item.
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http://www.qxcomponents.co.uk/tech.pdf
Sounds like it's a pile of poo.