Product Description
Most service professionals consider the dual (twin) mass flywheel to be a wear item, and recommend replacing it as part of each clutch job. Resurfacing of dual mass flywheels, common with conventional flywheels, is impractical and not recommended by many OEM's, including BMW and Porsche. In fact, reusing an old dual mass flywheel with a new clutch friction disk often results in unwanted noise, vibration, and harshness, due to torsion spring wear.
ECS recommends installing a new dual mass flywheel when replacing the clutch friction disk.
How it works: Dual (or twin) mass flywheels are made of two separate flywheel disks separated by a friction ring, and coupled through torsion dampers: springs and planetary gear sets. Transmitting drive from the engine to the transmission through vibration dampers isolates crankshaft torsion spikes, reducing transmission gear rattle, gear selection effort, and synchronizer wear. Failed dual mass isolation springs and gears cause noise and vibration.
Note: Must be mated to stock style SAC clutch kit. Some popular examples are Stock 335i Clutch, stock 335is/550i clutch or Spec SAC specific clutch kits. Spec SAC Clutch kits do not end in "-2". If you need further assistance please do not hesitate to ask before buying. This DMFW is an OE Replacement for your BMW 135i and 335i for 07-08 8 Bolt Flywheels. It's the same manufacturer who made your stock BMW 135i 335i N54 8 Bolt Flywheel.
LUK Dual Mass Flywheel (DMFW) 8 Bolt 21207542984 2007-2008 BMW 135i / 335i N54
