Nissan Motor Co. Ltd. says it will use a world-first dual-injector system to improve fuel efficiency in small-displacement gasoline engines. The new fuel-delivery system uses an injector for each port rather than one per cylinder, speeding up fuel vaporization and reducing the amount of unburned-fuel and hydrocarbon emissions. Nissan will introduce the new system in production vehicles starting early in fiscal 2010. Using two injectors per cylinder (one at each intake port) reduces the ...

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