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    M113K Modular Crank Damper, 150mm


    Availability: In stock


    M113K Modular Crank Damper, 150mm

    The 150mm pulley ring is for stock boost applications, as well as for use with our M113K Supercharger System Upgrade.

    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. 

    Key Features:

    • 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

    PDF Filem113k_pulley_torque_2 (217.1 KB)Download
    PDF Filem113k_crank_pulley_install_2 (626.6 KB)Download


    This policy only applies to installers and/or users who are in the United States, customers who reside in other countries should act in accordance with their local laws and regulations.
    Some Weistec Engineering performance upgrades may solely be used on vehicles in sanctioned competition which may never be used upon a public road or highway, unless permitted by specific regulatory exemptions (such as a CARB E.O.). For state specific details please visit the following website.
    It is the responsibility of the installer and/or user of the product to ensure that it is used in compliance with all applicable laws and regulations. If a product was purchased in error, do not install and/or use it. The purchaser must arrange to return the product(s) for a full refund.
    All performance modifications and installations are at the customer’s own risk. Weistec Engineering holds no responsibility either implied or otherwise for mechanical, electrical or other failure when using any aftermarket performance products.


    WARNING: Cancer and Reproductive Harm