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The difference between variable valve timing (VVT) and variable valve lift (VVL), plus how they work

Variable valve timing (VVT) and variable valve lift (VVL) have very similar names, both referring to variable valve performance. Does that mean that they are basically the same thing? The are most ...
Jalopnik

How Does Variable Valve Timing Work?

It's springtime! Time to start working on your project car, learn a new wrenching skill, discover what everything is under the hood (and how it works), or just spruce up your daily driver. All month, ...
Hot Rod

Variable Valve Timing For Circle Track Engines

In order to set a stage for what follows, let's first revisit some of the fundamentals involved in how valve timing relates to power output. And to further clarify how "power" is defined in the ...
autoevolution

Variable Valve Timing Helps Chevrolets Breathe Better

Getting air in and exhaust gases out of the combustion chamber under all speeds and driving conditions is essential for a car’s fuel efficiency and low emissions. That’s why virtually all Chevrolet ...
National Academies of Sciences%2c Engineering%2c and Medicine

Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles

Variable valve timing (VVT) is generally accomplished by phase shifting the camshaft relative to the crankshaft. By phase shifting the camshaft, the valve events are advanced or retarded relative to ...
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What Was The First Engine To Feature Variable Valve Timing & Why Was It Such A Game Changer?

The first production car engine with variable valve timing (VVT) came from Alfa Romeo in 1980. It was installed in the fuel-injected Alfa Romeo Spider. Before this, a few experimental systems existed, ...
Hot Rod

Why Variable Valve Timing? IVC Systems' 1999 Breakthrough Helps to Answer

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 ...
Motorcyclist

Desmodromic Variable Timing Explained

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, ...
CNET

Variable valve tech and what it does in your car

When you check out the features of a new car, you’ll probably be bombarded with glowing words about its engine’s “advanced valvetrain technology.” How did this happen? They don’t shower us with ...
Motor Trend

GM V-8 Variable Valve Timing

But because today's near-ubiquitous OHCs, driving valves from above, enjoy inherent efficiency advantages over one in the block operating them from below through pushrods while enabling higher rpm for ...
Autocar India

Bajaj patents new variable valve timing system; to debut on Pulsar 250?

Bajaj has patented a relatively simple variable valve timing system that could be used on its upcoming engines. Uses a small electric motor to change valve timing Could debut on upcoming Pulsar 250 ...