Chevy Impala’s Computer-controlled Valvetrain Technology


Lately General Motors realized that in order to win customers over their cars have to be really over-engineered. And so to let them know, they keep boasting about the new features they’ve come up with in the new cars.

The 2014 Chevy Impala for instance will get an advanced valvetrain technology on the Ecotec 2.5L four-cylinder engine that will help it reduce fuel consumption. The Intake Valve Lift Control (IVLC) technology enables variable intake valve lift, duration and timing over a wide range of engine operation. When the technology operates in low-lift mode, the engine pumps only the air it needs to meet the driver’s demand.

Not to be rude, but that’s the variable timing Toyota has been using for ages. Still, it doesn’t matter who came up wit it first, all that matter is that it’s works and has a good effect on lowering consumption.

Computer controlled Valvetrain Technology Chevy Impalas Computer controlled Valvetrain Technology

Technical details can be found in Chevy’s press release below:

“Intake Valve Lift Control works so seamlessly drivers aren’t likely to notice it at all,” said Mike Anderson, GM global chief engineer for Ecotec engines. “What they will notice is a fuel savings of up to one mile per gallon.”

The engine achieves variable valve lift using an innovative all-new rocker arm that switches between low and high lift intake cam profiles. The mechanism is actuated by an oil control valve through a dual-feed stationary hydraulic lash adjuster. It is the first of its kind for low friction roller-type finger-follower valvetrains in gasoline engines. The engine’s computer continuously selects the optimal lift profile based on conditions such as engine speed and load. 

Impala’s three powertrains all feature fuel-saving direct injection and lightweight components.

  • Impala’s Ecotec 2.4L engine works with the eAssist system to provide electrical assist in certain conditions to help save fuel. It is GM-estimated at 182 horsepower (134 kW) and 35 mpg on the highway. 
  • The Ecotec 2.5L is one of a new family of four-cylinder engines developed with increased efficiency and greater refinement. Output is estimated at 195 horsepower (145 kW).
  • Output for the 3.6L V-6 is estimated at 303 horsepower (226 kW).

All of Impala’s engines are matched with six-speed automatic transmissions.

The powertrains are the force behind Impala’s responsive driving experience, tuned for a spirited yet comfortable performance. A MacPherson-strut front suspension and four-link rear suspension underpin the Impala with an isolated front cradle and hydraulic ride bushing that help deliver a smoother, quieter ride. All models feature an electric variable-assist steering system that helps save fuel by drawing energy only when the steering wheel is turned.

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