Variable valve timing and variable valve lift may sound similar, but they're entirely different. Here are the differences between them and how they work.

Without variable valve timing, these intake and exhaust valves would operate in the same manner regardless of the engine’s RPM (revolutions per minute) speed or the driving environment. This isn’t ...

The jargon goes well beyond just names. Car specs are full of abbreviations that may or may not have any meaning at first glance. And sometimes we get so used to seeing those abbreviations that we may ...

Among Honda's many technologies, none ranks as synonymous with the brand as VTEC. The company's unique, dynamically adjustable valvetrain is, in large part, what helped make '90s-era Civics and ...

When it comes to the many variables of combustion inside an engine, engineers measure the timing of key events in degrees of crankshaft rotation, a relative frame of reference that remains constant ...

Most modern variable valve-timing (VVT) systems use a cam phaser that rotates the position of each cam­shaft relative to the timing chain. Think of making a record turntable go faster or slower by ...

GM has announced that all V-8 powered Chevrolet and GMC trucks now feature variable valve timing (VVT) for the 2010 model year. A quick trip back to engineering 101 reminds us that VVT is a piston ...

March 30, 2007 Over the last century of automobile development, we have seen an enormous range of valve actuation technologies, ranging from pushrod, through single then double overhead camshafts, ...

Honda's golden age commenced when it introduced the B-Series, the first production engine with variable valve timing and electronic lift control, otherwise known as Honda's VTEC system. The Honda B-16 ...