VTEC stands for "variable valve timing and lift electronic control." I guess Honda knew VTEC was easier to say than VVTALEC and it probably looks better as a sticker on the side of a car. VTEC allows for differing cam profiles, meaning different valve lift and duration, depending on the engine RPM. This video will dissect a Honda Civic Type R engine to show the ins and outs of how VTEC works. The Type R, unlike many previous performance Honda engines, only has VTEC on the exhaust side, with just

How VTEC works and why it's more than just a marketing term. ZTEC, Variable Valve Timing and Lift Electronic Control, is Honda's system that uses two camshaft profiles in one engine. At low RPMs, the engine runs on a conservative cam profile for fuel efficiency and torque. Once the ECU detects high RPM and load, it activates a locking pin in the rocker arms, switching to a more aggressive cam lobe with higher lift and longer duration. This allows more air and fuel into the combustion chamber, in

Honda's VTEC combines lockable rocker arms and dual-profile camshafts. This is what the VTEC dual-profile camshaft looks like. Note that the second cam profile is much larger, causing the valve to open more. At higher RPMs, the engine operates with the larger cam profile, while at low RPMs and low load, the engine operates with the first cam profile. How does the engine select which cam profile to use? Oil pressure controls a synchronizing pin that locks the rocker arms. When locked, the rockers

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