Wednesday, 21 August 2013

Harley-Davidson Twin-Cooled™ (Liquid and Air Cooled) High Output Twin Cam 103™

Harley-Davidson 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.

Just like we showed you here on well over two years ago. 

H-D says it has no choice; 'If you started in 1909 with the very first Harley-Davidson V-Twin engine and worked your way up through every engine, every innovation, every improvement, every ride, every durability test in all those years and countless miles since, you arrive at the Twin Cooled High Output Twin Cam 103™ engine, the top of the line. 103 cubic inches of air and precision cooled Harley-Davidson®V-twin power.'

Coolant is contained in a small 1.1 quart radiator. Twin Cooling cools the heads around the exhaust ports to deliver at or near peak performance under all operating conditions and temperatures. Harley states a higher compression ratio increasing efficiency and horsepower. The 2014 Ultra Limited and Tri Glide™ Ultra models also got a new airbox for increased airflow and a new cam to optimize low-end torque. Harley-Davidson mentions that it’s got the fastest 60 to 80 mph 5th gear roll on in the history of Harley-Davidson, meaning the most passing power. On top of all that, it puts less heat on the rider and passenger on hot days and in stop and go traffic.

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