LAGUNA NIGEL, CA – The next-generation of General Motors Corp.’s fuel-cell stack –the powerplant behind a future hydrogen-fueled vehicle – will fit anywhere the auto maker’s high-volume 2.2L 4-cyl. Ecotec engine does. GM has shaved about half the weight and size from the fourth- to the fifth-generation fuel-cell stack, says Byron McCormick, director-GM Fuel Cell Activities, while standing between an Ecotec engine and a crude mock-up of the future fuel-cell stack. Fuel-cell stacks, ...

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