Brand: TCI Auto
Manufacturer's Part Number: 870004
Part Type: Harmonic Balancers
Product Line: TCI Rattler Torsional Vibration Absorbers
Automotive Fittings Part Number: TCI-870004
UPC: 788120020404
Engine Balance: Internal
SFI Rating: SFI 18.1
Degree Markings: Yes
Degree Marking Range: 360
Outside Diameter (in.): 6.290
Crankshaft Pulley Bolt Hole Quantity: Three
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 8.30 lbs.
Description:
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