Fluidampr 843311 Steel Internally Balanced Harmonic Damper BMW M50 M52 S50 S52

The Fluidampr 843311 is a SFI 18.1-certified steel viscous harmonic damper engineered for BMW M50, M52, S50, and S52 inline-six engines. Designed as a direct upgrade over the factory elastomer-style harmonic balancer, it delivers broad-range crankshaft torsional vibration control across the entire RPM range — protecting critical engine components under both street and high-performance conditions.

This damper features an integrated 60-2 tooth tone wheel for crankshaft position sensor compatibility, making it the correct choice for M52 engines originally equipped with a 60-2 tone wheel. Both the removable 5.75" 6-rib inner and 5.00" 5-rib outer accessory drive pulleys are retained at stock sizing, and the 3.20" bolt circle outer pulley mount allows compatibility with common dry sump oil system drive mandrels.

Key Features:

• SFI 18.1 certified — meets the industry standard for harmonic damper safety
• Viscous silicone damping technology — continuously self-tunes in real time to control harmonics without rebuilds or tuning
• Protects against crankshaft torsional vibration across the full RPM range, reducing risk of crankshaft failure and wear on bearings, timing components, and valvetrain
• Recovers torque and horsepower lost to destructive vibration
• Integrated 60-2 tooth tone wheel for crankshaft position sensor pickup
• Removable stock-size accessory drive pulleys — 5.75" 6-rib inner and 5.00" 5-rib outer
• 3.20" bolt circle outer pulley supports dry sump oil system drive mandrels
• RoHS compliant black zinc coating with laser-engraved SFI credentials for a premium appearance in harsh racing environments
• Precision CNC-machined high-grade steel construction
• Made in the USA at an ISO 9001-certified facility
• Designed to last the life of the engine — no maintenance, rebuilds, or re-tuning required

Ideal for street performance, drifting, autocross, and road racing builds, the Fluidampr 843311 is an essential upgrade for any M50/M52/S50/S52 engine that has seen increased torque, elevated RPM use, or rotating assembly modifications that reduce the effectiveness of stock rubber-style dampers.