Twin Cool

Twin Cooling

Introducing 103 cubic inches of air and precision-cooled Harley-Davidson^® V-twin

A select number of the Project RUSHMORE motorcycles are built around the new Twin Cooled™ High Output Twin Cam 103™ engine. Twin cooling cools the heads around the exhaust ports to deliver at or near peak performance under all operating conditions and temperatures. Higher compression ratio increases efficiency and horsepower. There's also a 110 cubic inch version of this engine available in the CVO™ Limited. We've been building engines for 110 years. And we know from the smiles on the faces of our test riders, there's never been an engine that feels quite this good

Reprinted from HD's site