A variable valve timing mechanism has been developed. Its structure, operating principle and practical effects on the engine and vehicle performances are also presented.

提出一种可变配气相位机构，并介绍它的结构、工作原理以及为发动机和整车带来的实际效果。

youdao

Silverado and Sierra will accomplish its new mileage pinnacle with a 5.3L EcoTec3 V-8 relying on direct injection, cylinder deactivation and variable-valve timing to achieve EPA estimates of 16 mpg in the city and 23 mpg on the highway with two-wheel drive, or 16 in the city and 22 on the highway with four-wheel drive.

FORBES: GM Scores EcoBoost Via Higher MPG Claim On New Silverado