Why Harley Twin Cams Run So Hot

Why Harley Twin Cams Run So Hot. Video explains reasons why harley twin cams run so hot compared to previous harley motors. Harley Twin Cams were a new design in 1999, Totally different than other Harley motors. Why the EPA stopped Harley from producing the EVO and forced Harley to the new designed Harley Twin Cams to meet emission standards.