Fluidampr 610921 Harmonic Balancer for Nissan RB20DET / RB25DET NEO

Vehicle Fitment

• Nissan Skyline R32 RB20DET (turbo) - Phase-1 / NEO applications
• Nissan Skyline R34 RB25DET NEO (turbo) - Phase-1 NEO applications
• Engines: RB20DET, RB25DET NEO

Features

• Viscous damper design absorbs crankshaft torsional vibrations across full RPM range
• Steel housing with black zinc chromate finish - corrosion-resistant and durable
• Precision CNC-machined, internally balanced for smooth operation
• 4-groove serpentine belt pulley - supports front accessories setup
• Engraved degree/timing marks (TDC + 5° increments) for accurate ignition/timing reference
• Maintains belt alignment and accessory drive configuration after installation
• SFI 18.1 certified - suitable for street, performance, and racing use
• Made in USA - built to withstand demanding power and boost levels

Specifications

• Outside Diameter (OD): 6-1/8"
• Bore Diameter: 1.1800"
• Depth / Length: 2.765"
• Rotating Weight: 6.9 lbs; Total Weight: 10.5 lbs
• Engine Balance: Internal
• Pulley Material: Aluminum (serpentine belt grooves)
• Groove Count: 4-groove serpentine pulley
• Keyway: Yes - crank-shaft keyway maintained
• Drive Belt Type: Serpentine / accessory belt compatible
• Finish: Black zinc chromate (damper), hard-coat anodized (pulley) - corrosion resistant
• Safety / Standards: SFI 18.1 rated

Included Components

• 1x Fluidampr 610921 Harmonic Balancer (steel, viscous-type damper with pulley)

Product Description

The Fluidampr 610921 Harmonic Balancer is engineered specifically for the turbocharged RB20DET and RB25DET NEO engines used in Nissan Skyline R32 and R34. This performance damper uses a viscous internal design that absorbs crankshaft torsional vibrations over the entire RPM band - superior to stock rubber-type dampers that degrade over time or under increased boost/power. The result is improved crankshaft stability, reduced stress on timing components and bearings, and more consistent valvetrain behavior under high load or boost.

CNC-machined and internally balanced, the 610921 ensures smooth rotation and long-term durability. The integrated 4-groove serpentine pulley maintains stock accessory drive layout, making installation straightforward. With engraved timing marks, a corrosion-resistant finish, and SFI 18.1 certification, this damper is ideal for performance builds, street use, turbo upgrades, or racing setups. If you're building a high-output RB20DET or RB25DET NEO engine - this is a reliable, maintenance-free upgrade that helps protect your engine investment and improves performance under demanding conditions.