Harmonic Resonance and Torsional Vibration

RossPerformanceParts_BMWM50HarmonicDamper_@dylsusHarmonic resonance occurs when a system is subjected to an oscillating or cyclic loading with a frequency similar or the same as the natural frequency of the system, in this case the crankshaft. The result is oscillation at a much higher amplitude than the original load (the piston firing). If an engine lingers in this natural resonance continuously, crankshaft failure can occur. The harmonic damper is installed to reduce the peak amplitudes of these vibrations/oscillations to a sustainable level, reducing engine ware and risk of crankshaft failure.

Harmonic vibrations are caused by the way a crank twists and subsequently rebounds each time a piston fires, this is torsional twist and torsional vibration and occurs due to the immense torque exerted on the crankshaft and then released.

If these vibrations are not addressed, they will cause material fatigue, reducing the life of the crankshaft, bearings and associated components. Torsional twist can also interfere with the rotation of the crank, essentially trying to torque the shaft in the opposite direction. Which may impact the horsepower potential of the engine as well as adversely affect ignition timing.

As engine power increases, so does the amplitude of vibrations, resulting in accelerated wear on critical engine components. Not only does this affect the longevity of the engine but can also reduce the power output, both directly, and indirectly, by adversely impacting the efficiency of other high-end engine modifications.

A harmonic damper absorbs vibrations using an inertia mass suspended in an elastic material. As the hub of the damper vibrates with the crankshaft, the inertia mass remains static relative to the hub, this requires the rubber to deform. This deformation consumes energy, reducing the oscillation. All of this happens while the damper is spinning on the engine.


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Ross Performance Parts Tuffbond Harmonic Dampers

Ross Performance Parts Tuffbond Harmonic Dampers

The Harmonic Damper is a crucial part in protecting the longevity and performance of your engine. Its job is to counteract destructive torsional vibrations caused by harmonic resonance in the crankshaft.

Ross Performance Parts proprietary Ross Tuffbond harmonic dampers feature a fully fixed damping mass, preventing the damping ring from rotating independently under extreme torque. The bonding process guarantees the mass is positioned in a consistent location. After deforming and rebounding during acceleration, deceleration and/or oscillation, the mass will return to its original position ensuring the damper continues to function consistently.

The Ross Tuffbond design suspends the damping mass between the multiplane bonded rubber and multiple high performance duro o-rings. Compressing/sandwiching the mass maximizes surface contact. As the mass excites the increased contact absorbs more damaging vibrations. The increased surface contact also assists with vibration transfer as well as increasing the amount of torque the unit is capable of handling. Bonding on multiple planes, i.e. horizontally and vertically, also improves strength, further increasing the amount of torque the unit can manage and ensuring the mass does not tear loose prematurely.

By increasing the mass that is suspended and isolated from the crank, the greater the energy it takes to excite the damping mass. This increases the amplitude of vibration that can be absorbed and dissipated by the Harmonic Damper, making it more effective.

Unlike some oem and other performance dampers, where the pulleys are mounted to the rubber material, all Ross Performance Parts dampers include independent pulleys that bolt directly to the hub. This reduces the strain on the rubber and prevents accessory belts impeding the function of the damping mass, keeping it truly independent. This also removes the risk of cooling pump failure and allows additional accessory drives, such as a supercharger, to be added with no issue.

All Ross Performance Parts products are designed to provide the maximin protection without the need for modification, this means our parts are a true “bolt on” “out of the box” solution.

Ross Performance Parts Tuffbond Metal Jacket:Choosing Your Damper Series

The Metal Jacket utilises the proprietary Ross Tuffbond elastomeric bonding process. This unit is designed with all of the original accessory pulley’s being utilised in the standard positions and sizing ratios. In some instances, the power steering pulley is slightly under driven to improve performance at high RPM, whilst not affecting low-speed drivability.

Metal Jacket dampers are designed for high-performance street and occasional track application.

Ross Performance Parts Tuffbond Race Series

The Race Series takes the proprietary Ross Tuffbond technology to another level.

The Race Series has a larger damper mass, lightweight pulley packs with under driven ratios and a separate damper hub. This high-level modular design allows for infinite variations for an array of applications. With the heart of the Ross Race Series having been developed over many years in conjunction with some of the leaders of the high-performance racing industry in their pursuit for excellence.

Ross Performance Parts Tuffbond Gold Series

With the number of genuine 1000HP race vehicles growing all the time, Ross Performance Parts is staying ahead of the game.

The Gold Series is based on the design principles of the Race Series, however, by using a dissimilar material (compared to your crank) for our damper hub, a Ross Performance Parts Gold Series damper will eliminate microscopic migration of material between the surfaces of the crank nose and damper hub. Our technology is pivotal to the prevention of galling and wear of the crankshaft – maintaining a secure press fit over the lifetime of the damper.

 

Browse Harmonic Dampers


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The GS1005-1007 series Gear Sooth Sensors are Hall Effect devices designed for use in applications where ferrous edge detection or near zero speed sensing (without power up recognition) is needed. Current sinking output requires the use of a pull up resistor.

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