ATI Performance Products ATI918251 Super Damper Harmonic Balancer Aluminum - 6.325in 4G63

The ATI Performance Products ATI918251 Super Damper is a precision-engineered harmonic balancer designed specifically for Mitsubishi 4G63 and 4G64 engines found in 1990-1999 Eclipse, Talon, and Evo 1-3 platforms. This high-performance damper provides superior protection against harmful crankshaft vibrations in high-horsepower street and racing applications.

Key Features:

• 6.325-inch diameter aluminum outer shell with dual 4-groove serpentine belt configuration
• Integral lower cam drive design with one-piece hub/timing gear construction for maximum strength
• 12% larger outer diameter than OEM for improved harmonic dampening efficiency
• Patented elastomer O-ring design provides balanced dampening across all RPM ranges
• Laser-engraved 360-degree timing marks including TDC, 5°, 10°, 15°, 20°, 25°, and 30° with clockwise rotation
• SFI 18.1 certified for racing applications
• Black zinc chromate finish for corrosion resistance
• Tunable and rebuildable for long-term performance

Installation Notes:

• Direct replacement for stock OEM damper
• Factory lower timing cover must be trimmed for hub clearance
• Recommended replacement belt: Gates/Carquest K060715
• Custom hub replaces stock timing gear and mounts directly to crankshaft

Unlike conventional rubber-bonded dampers that deteriorate over time, the ATI Super Damper uses computer-machined grooves with proper-durometer O-rings that maintain their damping characteristics even under extreme racing conditions. This design eliminates the risk of timing mark misalignment and inertia ring separation common with worn factory dampers.