HARROP | Engineering, Superchargers, Brakes, Driveline, Engine, 4WD, Cooling. Harrop Engineering design, develop and manufacturing precision components for low volume automotive OEMs, Performance and Industrial markets. Harrop is a preferred supplier of Eaton Supercharger and Traction Control technology. Specialists in turnkey project management, aluminium casting, precision milling & turning, CNC Machining, fabrication and assembly.