The Baggers class presented by MotoAmerica during roadrace events has proven to be a resounding success, featuring heavily modified Harley-Davidson Road Glides competing against Indian Challengers. Whispers circulate about horsepower figures ranging between 165 to 185, showcasing the remarkable capabilities of these bikes, which are required to meet a minimum weight of 620 pounds and have astounded many with their ability to achieve exceptionally fast lap times.
It's a timely reminder for Harley riders that while being cool is enjoyable, the thrill of speed is equally exhilarating. Enter the CVO Road Glide ST from the Motor Company, now equipped with the 121 HO engine—121 HO indicating a 121ci (1,977cc) High Output powerplant—delivering an impressive 127 hp at 4,900 rpm and 145 lb.-ft. of torque at 3,000 rpm.
In contrast to non-ST 121 engines, this version forgoes variable valve timing in favor of a camshaft with extended, race-inspired valve timing, reaching a redline of 5,900 rpm.
Traditionally, Harleys have been renowned for their substantial low-end torque, necessary to propel their considerable weight from a standstill. However, with the evolving landscape of higher cruising speeds and increased traffic demands, the need for enhanced performance has led to advancements such as increased engine displacement.
Variable valve timing (VVT) has proven beneficial for acceleration during maneuvers like passing and merging. By adjusting the phase angle between the cam and crankshaft as the engine accelerates, VVT optimizes valve timing for different engine speeds.
The Harley KOTB racing team's experiences have likely informed the development of technologies that marry robust low-end performance with high-end horsepower. This includes innovative camshaft designs that prioritize intake efficiency throughout the entire engine cycle.
Derived from KOTB racing insights, enhancements like the Y-manifold intake and updated cylinder head aim to enhance airflow and overall engine performance. It's a testament to the notion that racing continues to drive advancements in production models, injecting higher levels of excitement and performance into the mix.
Moreover, adjustments such as the front pulley's reduction to 30 teeth from the previous 32 result in a notable 6.7 percent increase in torque at the rear wheel.
As power output rises, managing heat becomes increasingly critical. Liquid-cooling around exhaust valve seats serves to mitigate temperature-related issues, safeguarding critical engine components against the detrimental effects of high temperatures and metal fatigue.