V-6: Powered-Up with i-VTEC

In Accord V-6 models equipped with automatic transmission, the engine combines Variable Cylinder Management™ (VCM®) with Variable Valve Timing and Lift Electronic Control (VTEC). Together, the features are collectively called i-VTEC (intelligent Variable Valve Timing and Lift Electronic Control) in the Accord’s V-6. A new switching mechanism allows each cylinder to operate with low-rpm valve lift and duration or high rpm lift and duration. In addition, the rear cylinder bank can also leave all intake and exhaust valves closed to maximize fuel efficiency during cylinder deactivation.

The “intelligent” portion of the system is its ability to vary valve operation based on the driving situation and engine rpm. At low rpm, the VTEC intake valve timing and lift are optimized for increased torque, which now allows a wider range of 3-cylinder operation (when equipped with automatic transmission). As engine rpm builds past 5150 rpm (for 6AT; 4900 rpm for 6MT) the VTEC system transitions to a high-lift, long-duration intake cam profile for superior high-rpm engine power. In cylinder cut-off mode (6AT models), the rear bank of intake and exhaust valves remain closed to eliminate pumping losses.

Accord V-6’s i-VTEC with two different intake cam profiles is a key reason that the aluminum-alloy 24-valve engine now produces 278 horsepower at 6200 rpm (an increase of seven horsepower) and that torque is markedly improved in the lower ranges below 4900 rpm where the engine typically operates. It’s a seat-of-the-pants improvement you’ll feel every day.

Courtesy of 2013HondaAccordLaunch.com