Managed by the engine’s electronic control unit for precision fan speed control, these directly controlled viscous fan drives are designed to cool higher-horsepower, hotter-running engines. 
VMaster Ultra Fan Drives are being road tested by OEMs and fleets on the new reduced-emission vehicles. More than 4 million successful miles of testing have been completed within the past 12 months, the compnay said.
"This product is the result of years of analysis and testing to produce cooling solutions for the significantly hotter engines that result from reduced-emissions regulations," said Jeff Lindgren, vice president sales and marketing, Horton Inc. "VMaster Ultra Fan Drives rapidly respond to cooling needs, providing precision cooling and optimum efficiency. The combination of revolutionary product features and Horton reliability, service and availability make VMaster Ultra the superior choice for cooling reduced-emission engines."
The fan drive is equipped with an integral fan speed sensor to provide closed-loop control capabilities. VMaster Ultra’s optimized magnetic design speeds up reaction time for better modulation and cooling. In addition, the innovative reservoir, actuator and valve system combine to deliver a lower off-speed and faster response time resulting in optimum cooling, reduced fan noise and increased fuel efficiency.
VMaster Ultra has a rear-mounted cable harness to shield the connection from fan blades. The fan installs on the front of the fan drive to increase airflow for maximum cooling, the company said. VMaster Ultra directly controlled viscous fan drives are engineered to turn Horton’s WindMaster or competitive fans. VMaster Ultra Fan Drives have a maximum torque capability of 2,225 inch pounds [250 N-m] and are available for first-fit and test applications for a variety of fan sizes and mounting options.
VMaster Ultra Fan Drives are manufactured at Horton plants in Britton, S.D., and Germany. For information, visit www.hortonww.com.
