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Here are a few factors besides the ones already mentioned that don't work in the favor of chains: chains need lubrication. Do we really want another grease/oil in the engine bay? pulleys would have to be replaced with sprockets. If some debris finds its way in the engine bay and lodges itself in a sprocket you can look forward to broken teeth in case ...


Noise and Cost. It's really that simple. Chains used to be the most common device used for connecting the timing gears. Somewhere across the way someone told the consumer that cars shouldn't make noise and so the cheaper and less reliable belt was used by the manufactures. They did the same with direct drive (gear to gear) when they went to a fiber gear ...

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