The owner of this 2009 CVO 110″ wanted the same things as thousands of other Twin Cam owners, be they 88s, 96s, 103s, or 110s: a better exhaust note, smoother idle, no popping on deceleration, better off-the-line power, and, you guessed it, more power across the board, not only at a high rpm. That’s a reasonable request to be sure, but not one that many shops can deliver at a reasonable price. That’s why I called my buddy Andrew Rosa in nearby Huntington, New York. His Long Island shop, Rosa’s Cycle, has been cranking out smooth, dependable power from Harleys, be they Twin Cams, Evos, or Shovelheads, for almost 30 years.
Andrew’s plan is simple, and yet involved. The simple part is to get more air in and out of the engine, which is why he likes to bolt on a SE Stage II air cleaner, Rinehart exhaust, and a H-D Screamin’ Eagle Race Tuner (SERT). The involved part comes after this package is installed: that’s when Andrew’s years of dyno experience come into play. Others with less experience will spend many hours trying to get the idle smoothed out, the bad dip in power off idle corrected, and a respectable power increase out of these basic upgrades. Andrew, however, gets it all out the door and running sweet for a reasonable number.
For this upgrade we decided to use the newest addition to the H-D lineup, a 2009 Road Glide from nearby (to Rosa) Lighthouse Harley-Davidson. We went with a CVO 110″ because these engines seem to have a chronic idle problem and a bad dip in power at lower rpm. In their favor, they come equipped with a SE Stage II air cleaner and a high-flowing dual header system from the factory. That means all Andrew had to do was bolt up a set of sweet-sounding Rinehart slip-on mufflers (available from Drag Specialties), connect a H-D Super Tuner SERT, and work a bit of his magic in the dyno room. The accompanying dyno chart tells the tale.
–Chris Maida as published in American Iron Magazine, the world’s best selling Harley magazine.
• 9/16″ socket
• 1/2″ socket
See your local Drag dealer
670 E. Jericho Turnpike
Huntington Station, NY 11746
Rosa’s Cycle Shop
540 New York Ave.
Huntington, NY 11743