ATI Performance Products ATI917021 Super Damper Crankshaft Harmonic Balancer

The ATI Performance Products ATI917021 Super Damper is a high-performance crankshaft harmonic balancer engineered for demanding street, strip, and racing applications. ATI's Super Damper line is widely regarded as the industry standard in torsional vibration damping, protecting crankshafts and engine internals from destructive harmonic resonance that can cause premature wear or catastrophic failure.

Unlike OEM rubber-bonded balancers that degrade over time and lose effectiveness under high-RPM and high-heat conditions, the ATI Super Damper uses a precision-machined, elastomer O-ring-based damping system that maintains consistent performance across a broad RPM range and temperature spectrum.

Key Features:

• Precision-machined billet aluminum construction for reduced rotating mass
• O-ring elastomer damping system — more durable and consistent than rubber-bonded OEM units
• SFI 18.1 specification certified for use in sanctioned motorsports events
• Recalibratable — elastomers can be replaced to restore factory damping performance
• Precision timing marks for accurate ignition timing setup
• Designed for high-RPM applications where OEM balancers are insufficient
• Manufactured in the USA by ATI Performance Products

ATI Super Dampers are a direct upgrade over stock harmonic balancers and are a popular choice for engine builders looking to maximize engine longevity and performance. The SFI 18.1 certification makes this damper eligible for use in many drag racing and road racing sanctioning bodies that require approved harmonic dampers.