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The timing belt gathered a lot of interest by automotive engine designers 20 years ago. The Japanese were the first to drive their camshafts with these timing belts. Then other manufacturers followed suit. Some did not. Saturn decided that they would not adopt a belt and utilized a chain in their initial entry to the automotive market. They continue this decision and advertise the advantages of the chain timing drive. Jaguar never gave in to the new technology. Take a look at what auto manufacturers a bragging about today. "Chain Drive"! Subaru has changed from belt to chain, Porsche has made the switch back to chain, ..... Why has the automotive industry changed the trend? Because chain is a trouble free product. Have you ever seen a timing chain replacement as a scheduled maintenance on a car? All belt drives require scheduled replacement with potentially expensive consequences if you do not heed their recommendations. What about noise? Several years ago when we developed the original PDQ (Super Quiet) operator, we did most of our noise testing from the space over the garage. Isn't this where most people want quiet? We found that the harmonic motor and drive train vibrations caused nearly all of the noise. Chain noise was not transmitted to the space over the garage. How many people are worried about the noise in the garage? Everyone wants reliability.
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