A poly v belt is another type of belt inside the engine. This belt is a V-ribbed belt that is ribbed along one side. It’s much thinner than a drive belt in appearance. Because of this, it bends easier and is much more flexible which allows it move and wrap around smaller accessories inside the engine. Specifically, the ribbed side of the belt will come into contact with the grooves that are on the accessory drive pulleys and the flat side comes in contact with a tensioner roller.

The poly v belt derives its name from its appearance and the way it is able to weave itself in and out of various accessories and pulleys with ease. A poly v belt lasts longer than traditional drive belts and is much easier to remove and install. This belt also transmits power between the steering pump, alternator, water pump and air conditioner compressor.

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