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Weistec’s M113k Modular Crank Pulley has gone through extensive development and testing. While still being a dampened pulley, overall weight is dropped from the stock 10.5 lbs to 6.5 lbs. Incorporating our modular, and swappable supercharger pulley rings. We have created the best pulley you can buy for your AMG 55 vehicle.
At the heart of the crank pulley is our 3% under-driven, 6 rib harmonic damper. Utilizing the same race proven design we have been running on the M156 engines making in excess of 1000 horse power.
Unlike the stock elastomer (rubber) harmonic balancer, Weistec’s wet inertial crank damper protects your engine from destructive vibrations across the RPM range. Our damper consists of a high mass rotating inertia ring, inside a 6061 CNC machined and anodized housing. Internal lubricating fluid maintains stability across extreme temperature ranges and provides superior heat dissipation.
Every time your engine fires a cylinder’s combustion charge, pulses of torsional vibration are transferred into the crank shaft. These vibrations can become exponentially violent as engine rpm is increased. To dampen these destructive vibrations, the outer housing turns at engine RPM, while the inner inertia mass immediately self-centers and is free to be pulsed by each combustion event. As the inner inertia ring advances and retards itself in relation to the outer housing, the Mu (friction) force through the inertial system transforms the vibrations to heat, which rapidly dissipates through the internal fluid and housing.
Since the mass of the inertia ring is floating in the outer housing, the engine does not feel the full weight of the pulley. During acceleration RPMs, our 6.5 lb pulley only feels like 4.75 lbs to the engine.
The 6 rib harmonic damper is attached to your crank shaft with our Stressproof steel hub, incorporating optional crank pinning to protect your crank keyway in high horse power applications. We incorporate a brand new OEM torque to yield crank bolt to ensure reliability and clamping force.
And now the exciting part. Weistec offers 3 variations of Supercharger Ring Diameters, 150mm (stock), 170mm, and 180mm, allowing you to swap supercharger pulley sizes in 10 minutes with basic tools. A truly modular design that perfects the M113K to a new level.
*Product may not be emissions compliant. Check local laws prior to installation.
Drops Weight From 10.5 lbs to 6.5 lbs, Engine only feels 4.75 lbs of the 6.5 lb Total During Acceleration
Swap Between 150mm stock, 170mm, and 180mm Supercharger Ring Sizes
10 Minute Supercharger Pulley Swap Time
3% Under Driven 6 Rib Accessory Drive
OEM Crank Pulley Bolt Included
17% Overdriven water pump pulley is included to increase cooling and give clearance for larger Supercharger Pulley Rings
Includes New Belt to fit your selected pulley size.
Industry First, Pinned Hub Design
Unless otherwise stated, some Weistec Engineering performance upgrades are sold for race car use only.