Originally posted by holycowSVTpaul:
In any case, you always use a harmonic balance to damper vibration and a dual mode damper dampens on two frequencies.
Not true. A harmonic balancer is used on engines that are not internally balanced. The Duratec is. (as are most other engines) It uses a crank pulley with an integral damper and does not have a harmonic balancer.
Like you stated, the DMD is a damper that has two rings to dampen harmonics in 2 different frequency ranges.
