The Fluidampr SR20 Harmonic Balancer 630931 is designed specifically for Nissan SR20DE and SR20DET engines to deliver superior crankshaft vibration control and improved durability under street or performance use. By replacing the stock elastomer balancer with a viscous damper, it significantly reduces destructive torsional harmonics and helps preserve engine internals, especially when power levels or RPM are increased.

Fluidampr 630931 Harmonic Balancer Features:

• Viscous-damped design uses an inner inertia ring suspended in silicone fluid to absorb a broad range of crankshaft torsional vibrations across the entire RPM range
• SFI 18.1 certification for race and high-performance builds, ensuring balanced, safety-rated operation under stress
• Outer–diameter of 6.375 in. matches stock-size pulley, maintaining accessory belt routing and fitment for factory or aftermarket A/C, power steering, alternator, etc
• Marked reduction in crankshaft vibration; dyno testing showed 12-percent average reduction in torsional vibration amplitude versus new OEM elastomer dampers
• Heat- and corrosion-resistant construction: CNC-machined steel housing with black zinc/hardened finish for long life
• No maintenance or periodic rebuild required; damper is sealed and balanced at manufacture

Fluidampr 630931 Harmonic Balancer Notes:

• Fits 1995-1998 SR20DE (e.g. 200SX) and all SR20DET engines; confirm crank and pulley compatibility before ordering
• Because the damper is heavier than some lightweight competitors, verify pulley clearance and belt alignment especially if using aftermarket pulleys or accessory drive kits