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Description
Manufacturer compare numbers
BMW
21 20 7 594 958
21 20 4 588 471
21 20 7 616 014
21 20 7 629 269
21 20 8 638 897
21 21 7 647 334
4 588 471
7 594 958
7 616 014
7 629 269
7 647 334
8 638 897
Manufacturer
Dual-mass flywheel (DMF) LuK
Higher torque levels, greater ignition pressures, and stricter emissions controls are causing ever greater rotational irregularities in today's engines, and thus higher levels of vibration in the powertrain. Higher demands on comfort and quiet as well as greater measures to protect the transmission all require extremely efficient torsional vibration dampers
Advantages
- Lower fuel consumption due to lower rpm levels when idling and easy operation in low rpm ranges
- Lower shifting forces, i.e. greater comfort due to reduced inertia of clutch discs without torsional dampers
- Good driving comfort thanks to strong vibrational damping for sudden load changes
- Quieter thanks to optimum decoupling of vibrations throughout the entire rpm range
- Smooth start/stop performance
Design
The DMF features a multi-stage characteristic curve. The first stage uses soft springs to ensure outstanding engine starting and stopping performance. The second stage has firmer springs to provide superb decoupling of torsional vibrations during normal driving operations.
