The Harley-Davidson CVO Road Glide Custom model(FLTRXSE) is equipped with an air cooled 110″ Twin Cam engine (most of rest the lineup uses a 103″.) Anachronistic engine? Yes, for sure, but Harley fans are attached to air cooled engines and don’t want their bikes (EPA permitting) to be equipped with a radiator.
Summer heat, triple digit temperatures, stalled in traffic. So, how does Harley succeed at avoiding its air cooled powerful engine (122 lb-ft torque) to melt under your seat?
With a function called “Rear Cylinder Cut Out” system introduced in 2008. Taking in account that the rear engine cylinders always running hotter because not receiving as much air flow as the front one, the “RCC” is conceived to try to equalize the difference of temperature by shutting off fuel and spark to the back cylinder if the motor idles for more than 3 seconds above 288°F. Below 275 F normal operation resumes. Until 2009 RCC was actuated by a cable and since then by the throttle-by-wire technology. Many cars use this technology of cylinder deactivation with the objective of saving fuel. Not the main preoccupation of bikers with their motorcycles. Just interested by more power… (picture @ harley-davidson. Written with assistance Popular Mechanics)