Mazda's "uniquely engineered" Sky engines will offer best-in-class fuel efficiency
At launch, the Mazda6 will be available with at least two entirely new Mazda-developed Sky engines. According to the company, both the 2.2-liter Sky D diesel and the 2.0-liter Sky G gasoline engines will offer best-in-class fuel efficiency, but both engines achieve their fuel-sipping status via unconventional designs. The diesel unit has a relatively low 14:1 compression ratio and meets 2013 Euro 6 emissions regulations, but does so without expensive NOx traps and therefore is cheaper to build than many of today's Euro 5 diesel mills. The gasoline engine is normally aspirated, but its high 14:1 compression ratio gives it much-improved low-end torque. Key to the engine's design is its oversized 4-2-1 manifold. This manifold boosts power, but also requires more packaging space. Both engines conform to Mazda's global powertrain strategy and, as such, they will see widespread use in numerous company vehicles in the coming years.
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