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Better breathing. Better health.
It works for trucks, too. All 2010 Chevrolet and GMC V-8 powered trucks now feature variable valve timing, a technology that enables continuous control of valve opening and closing that result in better engine breathing, fewer emissions and improved fuel economy.
The addition of VVT to the 4.8L and 5.3L truck V-8s completes the rollout in the truck small block V-8 lineup which includes the 6.0L and 6.2L V-8s. The component that makes VVT possible is a simple and reliable device that attaches to the end of the camshaft called a cam phaser. The dual equal cam phaser electro-hydraulically controls cam position with the help of a sensor and the engine control module.
When working with Active Fuel Management (cylinder deactivation) on the 5.3L V-8, variable valve timing helps deliver segment-leading fuel economy in the 2010 GMC Sierra and Chevy Silverado pickups.
The Sierra and Silverado are EPA estimated at 15 mpg city and 22 mpg highway, which is better fuel economy than the less powerful 2010 trucks from Ford and Toyota. (Toyota Tundra 4.6L V-8 EPA estimates 15 mpg city and 20 mpg highway. Ford F-150 292 hp 4.6L V-8 EPA estimates are 14 mpg city and 20 mpg highway.)
The majority of Chevrolet and GMC trucks have engines available with variable valve timing.
Exploded view of the cam phaser assembly used in the 5.3L V-8 engine and other Chevy and GMC small block truck V-8s. Shown (from left) is the central valve bolt, target wheel, return spring and the hydraulic unit with sprocket. The engine control module directs the phaser to advance or retard cam timing, depending on driving demands.