Mercury - Quicksilver Rotor Ignition System Component Coated Brass and Polymer 13524T1. Overview. A strong spark is the heart of a dependable engine, and the Mercury Marine 13524T1 Quicksilver Rotor keeps that spark firing clean and steady. Built for Marinized General Motors V8 engines running Thunderbolt IV and V ignition systems, it's a small part that does a big job - delivering power evenly and reliably through every cylinder. Whether you're running offshore or idling into the dock, this rot