Nissan are to incorporate the newly developed Dual Injector System in small-displacement petrol engines from as early as 2010. The new systems is similar in theory to “direct-injection” systems, which are difficult to use on small-displacement engines because they require a high-pressure pump that complicates system design and makes component layout less cost-efficient. According to Nissan, the new injector system, which uses one injector per intake port rather than one per cylinder, improves fuel efficiency by up to 4%. The improvement in fuel efficiency is accomplished due to the diameter of the fuel droplets being reduced by 60%. Nissan says the new injector system is easier on the catalyst system, using half the amount of rare metals in the catalyst.
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