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 ...

There is so much going on with internal combustion engines (ICEs) these days, it can give you a headache just reading about them. That's why we do the research for you and then cram it into bite-size ...

If all V engines had sported overhead cams since the beginning of automotive time, someone surely would have come up with the brilliant idea of incorporating a single camshaft deep inside the block ...

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 ...

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, ...

The LEA is an engine produced by General Motors for a wide variety of compact and midsize vehicles. Displacing 2.4 liters in an inline-four configuration, the LEA is part of the Ecotec engine family.

When it comes to eight-cylinder gas engines, GM has some twisted engineers who are hard at work in its labs. No, they're not crazy, unless you consider the almost fanatical obsession they have with ...

Variable Valve Timing-Intelligence, or VVT-i, is a variable valve-timing system developed by Toyota that debuted in the 1990s. VVT-i uses input from sensors and driving conditions to improve engine ...

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 ...

Every aspect of an engine is a compromise: torque for horsepower, efficiency for emissions, performance for fuel economy, compression for octane tolerance. During the evolution of the internal ...