Shared Technologies : Engineering: Valvetrain

VTEC Engineering (Accord, Civic, Clarity Plug-In, CR-V, Fit, HR-V, Insight, Odyssey, Passport, Pilot and Ridgeline)



What’s the Benefit?

Honda’s variable valve timing and lift electronic control (VTEC®) helps an engine make usable power throughout its entire rpm range, for satisfying throttle response in all situations. Fuel efficiency36 and emissions performance are enhanced as well.

The Feature: 

VTEC is an elegant engineering solution that solves a problem inherent in internal combustion engines: 

  • Intake and exhaust valve-opening characteristics (timing, duration and lift) that work well for low-speed power production are extremely inefficient at high engine speeds, and vice versa.
  • VTEC solves this by using two different sets of cam lobes to operate the valves.
  • The profiles of each type of cam lobe alter the timing, duration and lift of the valves to optimize engine breathing for its particular engine speed. 
  • A hydraulic system switches between the different cam lobes, controlled by engine electronics