TCI Rattler Torsional Vibration Absorbers 870012

All piston engines produce crankshaft torsional vibration. TCI Rattler torsional vibration absorbers counteract those vibrations by using internal rollers that automatically offset the twisting forces and eliminate the root cause of torsional vibration. They are effective for the entire RPM range and extend crankshaft and bearing life while also increasing valvetrain stability. Their design does not utilize viscous fluids and they are lighter than most dampers of the same size and material construction.

Rattler vibration absorbers feature steel rollers that fit loosely into a specific number of holes. By using an exact, patented, mathematical relationship, the rollers roll forward during the compression stroke and backward during the power stroke to keep engine speed variation and vibration to a minimum. The rollers are actually centrifugal pendulums that store and release energy back into the crankshaft rather than converting it to heat energy as dampers do. They are not frequency specific, but are based on the number of cylinders or the events per revolution so they are practical for street use, as well as track and drag strip use.

Features include:

* Standard bolt patterns
* Available for internally and externally balanced engines
* Etched integral timing marks can't move relative to the crankshaft
* Maintains maximum effectiveness at all engine speeds
* Virtually no maintenance required
* No fluids, elastomers, or friction materials
* No pulley or crank trigger shims required
* CNC-machined to exact tolerances
* SFI 18.1 certified
Brand: TCI Auto
Manufacturer's Part Number: 870012
Part Type: Harmonic Balancers
Product Line: TCI Rattler Torsional Vibration Absorbers
HP Direct Part Number: TCI-870012
UPC: 788120023696
Engine Balance: Internal
SFI Rating: SFI 18.1
Degree Markings: Yes
Degree Marking Range: 360
Outside Diameter (in.): 7.170
Crankshaft Pulley Bolt Hole Quantity: Six
Keyway Quantity: One
Harmonic Balancer Material: Steel
Harmonic Balancer Construction: Nine internal rollers
Harmonic Balancer Color: Black powdercoated
Mounting Hardware Included: No
Quantity: Sold individually.
Notes: Weight is 8.50 lbs. This damper is designed to be used with a 1971 and later timing cover with the pointer on the driver side. If it is used with the passenger side pointer, it will be 90 degrees off.