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Loud chatter from the transmission, reduced transmission life and severely limited driving comfort coupled with travel noise that makes having a conversation inside the vehicle impossible are just some of the few unpleasant side effects caused by uninsulated torsional vibrations the automobile industry would have to deal with if it did not have components in the drivetrain that damp vibration.
One trigger of torsional vibrations is the result of the periodic stroke of a four-stroke internal combustion engine that, when combined with the cylinder ignition sequence, leads to rotational irregularity of the crankshaft. The drive train, a system with characteristic natural frequencies capable of producing torsional vibrations, is also responsible for converting the rotational irregularities introduced by the engine into torsional vibrations. There is an increased need to deal with the development trend that began in the 1980's that involved optimizing the friction of the drivetrain and increasing its efficiency. However, the modern direct-injection diesel engine provided the developers with new challenges more than twenty years ago. While engine torques continued to rise, the optimization of the drive unit also generated an increase in so-called
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 625ZZ KOYO | 5 | 16 | 5 |
| 605ZZ KOYO | 5 | 14 | 5 |