Modern (roughly 1988+) DOHC, SOHC flat 4, flat 6, flat 8, and flat-plane V8 have no need for this device. The engine's tune especially in computer controlled applications can have a dramatic effect on durability, the aggressiveness of the tune puts the engine at risk of detonation which can be catastrophic to all rotating assembly components.
The need for a damper will depend on the age of the engine design, its manufacture, strength of components, usable powerband, rev range and, most importantly, the quality of the engine's tune. 5 Engine design, materials & other factors.3 Countering torsional crank motion and harmonic vibration.2 Torsional crankshaft movement and harmonics.The harmonic balancer often serves as a pulley for the accessory drive belts turning the alternator, water pump and other crankshaft driven devices. Dampers are designed with a specific weight (mass) and diameter, which are dependent on the damping material/method used, to reduce mechanical Q factor, or damp, crankshaft resonances.Ī harmonic balancer (sometimes called crankshaft damper, torsional damper, or vibration damper) is the same thing as a harmonic damper except that the balancer includes a counterweight to externally balance the rotating assembly. Harmonics and torsional vibrations can greatly reduce crankshaft life, or cause instantaneous failure if the crankshaft runs at or through an amplified resonance. It is essential on engines with long crankshafts (such as straight-six or straight-eight engines) and V8 engines with cross plane cranks, or V6 and straight-three engines with uneven firing order. An interference fit ensures the device moves in perfect step with crankshaft.
This device must be interference fit to the crankshaft in order to operate in an effective manner.
#HARMONIC BALANCERS FREE#
Harmonic balancer lower pulley on a four-cylinder engineĪ harmonic damper is a device fitted to the free (accessory drive) end of the crankshaft of an internal combustion engine to counter torsional and resonance vibrations from the crankshaft.
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