Blower Pulley 8mm x 3.5 55-Tooth Polished

The Blower Drive Service Blower Pulley 8mm x 3.5 55-Tooth Polished (model BP-6855) is a precision HTD supercharger pulley engineered for high-performance engine builds requiring reliable boost delivery and consistent belt engagement. This 55-tooth aluminum pulley features an 8mm pitch with a 3.5-inch width, delivering the exact timing and load distribution critical for forced-induction applications where margins for error are minimal.

The polished aluminum construction provides both durability and thermal efficiency—heat dissipation is critical in supercharger systems operating under sustained boost. The HTD tooth profile (synchronous belt drive) ensures positive grip without slippage, eliminating the variable slip inherent in V-belt systems. The 55-tooth configuration is specifically sized to match common blower displacement ratios, balancing boost pressure against parasitic loss. At 2.28 lbs, the pulley is light enough to minimize rotational inertia while maintaining structural rigidity under centrifugal stress.

This pulley is designed for serious engine builders and performance enthusiasts running supercharger kits on street, road course, or drag racing applications. Blower Drive Service is recognized for precision machining and tight tolerances, making their pulleys a standard choice among shops building high-output forced-induction engines. Proper pulley selection directly impacts compressor speed, inlet boost pressure, and overall system efficiency—getting the ratio right is non-negotiable for reliable performance.

HTD pulley systems have become the baseline for modern supercharger installations, replacing older V-belt designs due to their precision engagement and longevity. The 8mm pitch is industry standard for most centrifugal and twin-screw applications. Confirm your specific blower model and desired boost target before ordering—pulley tooth count directly governs compressor RPM and must match your belt drive ratio specifications.