Harley Brings Liquid Cooling to Two Touring Models

Twin-Cooled High Output Twin Cam 103: Designed to maintain performance in the most-challenging situations, the new Twin-Cooled High Output Twin Cam 103 powertrain is featured in the 2014 Ultra Limited and Tri Glide Ultra models. A combination of air-cooled and precision liquid cooling strategies allow the Twin-Cooled High Output 103 to maintain peak performance under the most demanding loads and riding conditions, and enables a higher 10.1:1 compression ratio for increased power and efficiency. 

       The Twin-Cooled High Output 103 offers 10.7 percent more peak torque than the standard Twin Cam 103 engine. Liquid coolant is routed through the cylinder heads in the area around the exhaust valves and then to ducted heat exchangers located in the left and right fairing lowers. The precision cooling system is thermostatically controlled, and uses an electric pump to circulate coolant. The Twin-Cooled High Output 103 may also improve thermal comfort to the rider and passenger in extreme conditions, such as stop-and-go traffic in high ambient temperatures. Cylinder head temperatures are lower, the airbox shape improves airflow, and reshaped fairing lowers improve venting of air to the rider and passenger.

Link to Patent Office