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Old 10-12-2012, 03:08 PM   #6
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Originally Posted by RobS74 View Post
Zetec motors are INTERNALLY ZERO balanced, meaning the factory pulley IS NOT a harmonic dampener of any kind. This means swapping the crank pulley will have NO adverse effects on engine longevity.

I have covered this before.
There are 3 types of pulleys in automotive use, a pulley, a dampener and a balancer. Each has a specific purpose.

A pulley is simply there for a belt to ride on and rotate.
A balancer is used to help balance some component. It offsets torsional flex in an internal shaft generally.
A dampener is used to absorb, limit or isolate harmonic vibration from one component to another.

The zetec has a harmonic dampener.
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