Mazda SkyActiv-G 2.5T

Mazda develops new SkyActiv-G 2.5T direct injection turbocharged diesel engine

Mazda announced on November 19 that they developed the new SkyActiv-G 2.5T, a 2.5L direct injection turbocharged diesel engine, and it will be equipped in the all-new CX-9 crossover SUV, which will be released in the North American market in Spring 2016.

The SkyActiv-G 2.5T was developed as the first turbo engine among its series. It was based on the SkyActiv-G 2.5 naturally-aspirated engine, and it is equipped with the world’s first Dynamic Pressure Turbo, a new technology that focuses on controlling exhaust pulsation. Its valve opens at high-speed driving where it can have sufficient exhaust energy, and it also operates with fewer pulsations, just like the usual turbo engines. On the other hand, its valve squeezes at low speeds and it controls exhaust interference from each port, which is the main cause of turbo lag.

It also has a cooled Exhaust Gas Recirculation (EGR) that expands its theoretical air-fuel ratio limit. It takes a part of the exhaust gas after combustion, and after it gets cooled with the EGR, it regenerates as an inert gas at a low temperature. It lowers combustion temperature and prevents knocking sounds, and it gets better fuel efficiency through the expansion of theoretical air-fuel ratio and maximization of ignition timing.

The SkyActiv-G 2.5T generates a linear and powerful acceleration through low and mid-speed driving together with its excellent fuel efficiency, and a satisfactory response without turbo lag. It has a maximum output of 227hp, and its maximum torque is 420Nm, which is average for a 4L V8 naturally aspirated gasoline engine.

(Translated by Claire Marie Sausora)