Lightweight Crank Pulley

The JH Motorsports V10 FSI Lightweight Crank Pulley is a performance enhancement component for the Audi C6-S6 and D3-S8 models equipped with the V10 FSI engine. The OEM crank pulley weighs approximately 10.4 lbs, while the JHM lightweight version tips the scales at just 1.6 lbs, resulting in a total weight savings of nearly 9 lbs. This reduction in rotating mass is a key strategy for unlocking additional horsepower and improving overall engine responsiveness in naturally aspirated V10 FSI engines. While not a drastic increase, it contributes to the overall performance potential of the vehicle. Installation of this lightweight crank pulley offers an opportune moment to replace your drive or alternator belt. Proper belt tension is crucial; it must be set at least as tight as the stock belt to prevent slippage and associated squealing. One specific bolt hole on the OEM pulley features a dowel pin that must be transferred to the JHM pulley, ensuring correct one-way installation. All bolts should be torqued to 20 ft lbs in a star pattern, and the use of loctite is recommended for secure assembly.