Nissan develops dual injectors for small petrol engines

Nissan Motor has developed a dual injector system designed to improve fuel efficiency in small-displacement petrol engines. The new fuel delivery system, the first of its kind, uses an injector for each port rather than one per cylinder, speeding up fuel vaporization, reducing the amount of unburned fuel and reducing hydrocarbon emissions. While most current petrol engines utilize one injector per cylinder (furnishing fuel to two intake ports), the new system doubles the number of injectors per port, reducing the diameter of the fuel droplets by about 60%, resulting in smoother, more stable combustion. The system also adds continuous valve timing control on the exhaust side to conventional intake side control, improving heat efficiency, reducing pumping losses and raising fuel efficiency by up to 4% in conjunction with the dual injectors. Nissan will introduce the new system in production vehicles starting in Fiscal Year 2010. (July 17, 2009)