Luk Flywheel/Clutch; Dual Mass Flywheel - Alfa Romeo 159 Training Material

CLUTCH
1. Buffer damping springs
2. Splined hub

4.4 LUK FLYWHEEL/CLUTCH

CHARACTERISTICS: The LUK flywheel/clutch is fitted on 2.4 M-jet 20V versions and presents the following features:
dry single plate clutch
push release system: this means that the clutch is released when the sleeve pushes the diaphragm
spring reversing its concavity

dual mass flywheel.

Some technical specifications:
Weight (kg)
Moment of inertia (kgm
4.4.1 Dual mass flywheel
OBJECTIVE: The flywheel makes engine operation smooth by accumulating kinetic energy during the active stroke of
the engine and letting it out during the three passive strokes; this ensures smoother engine running because the
engine power output to the driveline is stabilised by the flywheel that levels the engine power output.
CHARACTERISTICS: The engine version fits a dual mass flywheel with two weights, one integral with the crankshaft
and the other integral with the gearbox primary shaft, via the clutch plate. A damping torsional flexible system
consisting of a double spring system (also arranged in parallel) with different elastic stiffness is arranged between the
two masses. Another consequence of this type of flywheel is bending resonance variation which respect to a normal
flywheel is under the engine running speed.
The diagram below shows the theoretical bending damping characteristic of the flywheel. The x-coordinate shows the
working angle in degrees of the internal system (relative angle between the two parts of the flywheel, primary and
secondary); the y-coordinate shows the transmitted torque in Newton-metres.
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
Clutch cover
3.75
2
) 0.0389
Friction plate
0.95
0.0055
192/318
© 2004 Fiat Auto S.p.A. - All rights reserved
Fiat Auto S.p.A.
After Sales Training
Flywheel Total
12.90 17.6
0.154