To celebrate HOT ROD's 75th anniversary, we teamed up with CASTROL GTX to bring you some of the stories that exemplify the core of what HOT ROD is and reflect the brand's influence on America's car ...

Valve overlap—that crucial interval when both the intake and exhaust valves are open, expressed in degrees of crankshaft rotation—is typically a fixed parameter and always a compromise. For example, ...

GALESBURG, Mich.--(BUSINESS WIRE)--Intelligent power management company Eaton today announced its Vehicle Group's cylinder deactivation (CDA) and late intake valve closing (LIVC) technologies have ...

For the PDF version of this article, click here. While the motoring public waits breathlessly for the promise of a revolution in powertrain technology to materialize, the venerable gasoline-powered ...

A variety of two-stage, or discrete, variable valve lift (DVVL) and continuously variable valve lift (CVVL) systems have recently been incorporated in production vehicles. Several systems that have ...

Hyundai recently introduced a new piece of engine tech into its lineup called Continuously Variable Valve Duration (CVVD). Similar to variable valve timing or variable valve lift, it physically alters ...

While the engineering community continues to explore the benefits of electric and hybrid vehicles—i.e., the environmental and renewable energy factors—the automotive market is still dependent on ...

Honda did not invent variable valve timing or variable valve lift. In fact, Cadillac had a driver-operated variable valve timing system in production in 1903, three years before Soichiro Honda was ...

Set to debut in a new 1.6-liter 4-cylinder Smartstream turbo engine, Hyundai's new valve tech is able to continuously change the duration of valve openings to suit driving conditions, which Hyundai ...

Four-stroke engines, which make up 99% of vehicles on the road, rely on a system for managing air intake, compression, combustion, and exhaust within a sealed combustion chamber. Poppet valves are ...