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I've often wondered that, myself. What is the advantage of a serpentine belt? There must be one, as every manufacturer has changed to them in recent years.
[font color=red size=2]I can only come up with a couple advantages...The wider belt requires less tension, which would be less stress on the bearings. The bracketry and pulleys might be more interchangeable for different vehicles in the factory (maybe?). One longer belt is probably cheaper and easier to make and install at the factory. Plus it looks really cool - but that's me...
I would also guess that it could mean a more compact engine bay since you only have to deal with one belt width instead of adding depth for each accessory. Also it may mean less inventory needed to be stocked for multiple types of belts for one engine, just have one belt for one engine.
So assuming that you have the engine bay space (which we all do) and don't have to worry about carrying belt "inventory" (none of us do), there's no performance or reliability advantage to a serpentine system, right?
One belt puts less load on the front main bearing vs. multiple belts. The tensioner helps even more by preventing overtightening. You’d be surprised how much wear takes place on the upper bearing shell from all the accessories, especially if there is ac. I’ve seen it completely wiped out while all the others were fine. This has to put an extra drag on the engine compared to the serpentine setup.