21207542984
Description
Details
- SKU: LUK-4150377100
- Quality: OE
OE Numbers
21207542984MFG Numbers
4150377100, DMF112Product Information
Genuine BMW replacement dual mass flywheel, acts as a mounting point for the pressure plate
A flywheel serves two important functions. Firstly, the flywheel is a rotating mechanical device that stores rotational energy. It helps maintain engine rotation in between ignition cycles. Secondly, the flywheel is the friction surface for the clutch disc and a mounting point for the pressure plate.
A dual mass flywheel is a special flywheel that has an inner and outer mass. The inner mass is coupled to the engines mass moment of inertia while the outer mass is coupled to the transmissions moment of inertia. The inner and outer mas are lined by a spring/damping system which reduces drive train vibration and allows for smooth clutch engagement and disengagement.
As a dual mass flywheel ages it can develop an issue with the damping system which can cause severe vibrations. For this reason FCP recommends replacing your dual mass flywheels with every clutch service.
About LuK
LuK invented the diaphragm spring clutch and today 1 in 4 cars have a LuK clutch. As a key source for OEM (Original Equipment Manufacturer) automotive clutch, torque converter, hydraulic and transmission systems, LuK is a brand respected for innovation and quality. In fact LuK recently brought the double-clutch transmission with components for continuously variable transmissions into the auto market.
LuK brand is part of Schaeffler Technologies, a renowned supplier and industry leader in the manufacturing of OEM and aftermarket automotive parts under the brands INA, FAG and LuK. They are one of the largest German and European industrial companies with family ownership, with 180 locations, presently, in over 50 countries.
LUK Dual Mass Flywheel (DMF)
LuK dual-mass flywheels absorb engine vibrations before they are transmitted to the driveline where they can create gear rattle.
These units feature a built-in damper designed to isolate engine torque spikes and prevent transmission damage. By design, dual-mass flywheels cannot be resurfaced.
This all makes the LuK dual mass flywheel the ideal solution.
With one drawback: the higher the mass reactance of the vibrating masses, the more excessive the resonance increase and associated torque peaks. With the dual mass flywheel, this would be easily perceived when starting and stopping the engine; much more easily than with a conventional clutch system. Additionally: the smaller flymass of the engine has less of a stabilizing effect on the speed fluctuation of the engine.
Thanks to decades of experience in clutch building, the LuK specialists were able to find an excellent solution to this problem. An additional damping device effectively prevents resonance overload. In normal operation, however, this additional damping device has no function and the torsional vibrations of the engine are filtered out by spring dampers.
Friction and spring rate - the correct ratio is important.
For optimal vibration isolation and soft resonance passage when starting and stopping the engine, the ratio between friction and spring rate must be optimal. The length of the springs is a key factor: The softer a spring, the more efficiently vibrations are isolated. The extra-long springs of the latest generation of dual mass flywheels significantly reduce the spring rate compared to a first generation dual mass flywheel. In routine driving operations, excessive resonance increases are kept almost completely away from the gearbox.
Features and Benefits:
- Top driving comfort
- Absorbs vibrations
- Prevents noise
- Enables comfortable, low-revs driving
- Saves fuel
- Relieves crankshaft and gearbox
Enhanced 24/24 Warranty - We provides a customer satisfaction policy that all automotive parts sold will be free from defects in material or workmanship for a period of 24 months / 24,000 miles/40,000 kilometers(Canada only) (whichever occurs first) or, the expressed manufacturer’s warranty, whichever is greater.
LuK - Schaeffler
LuK - Schaeffler develops and manufactures precision products for everything that moves; in machines, equipment, and vehicles as well as in aviation and aerospace applications.
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