BorgWarner suggests Valve-Event Modulated Boost system can offer 6-17% fuel economy benefit over already downsized and turbocharged engines
Green Car Congress
MAY 9, 2012
The company originally described the system in a 2010 SAE paper (2010-01-1222) and at the 2010 World Congress. The concentric camshaft features one set of lobes connected to the phaser sprocket, and a second set next to it is connected to phaser. VCD can deliver about a 4.5% on a D-class sedan compared to about 8%, Thomas said.
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