Thursday, December 24, 2015

2016 Mazda CX-9 Engine

The all new 2016 Mazda CX-9 has made its official debut in 2015 L.A. Auto Show, the most interesting is the engine will be change to a SKYACTIV-G 2.5 Turbo Charge engine instead of the previous 3.7 V6 engine which having maximum output of 277HP (204kW), so let see what feature is having on this SKYACTIV-G engine.


Features of SKYACTIV-G 2.5T
  • High compression ratio
    Mazda engineers achieved a compression ratio 10.5:1, one of the highest for any turbocharged engine with an 89-mm bore size that can run on regular gasoline.*4
  • Dynamic Pressure Turbo
    SKYACTIV-G 2.5T is the world's first turbocharged engine with the ability to change the degree of exhaust pulsation depending on engine speed. At low rpms (below 1620 rpm), the volume of the exhaust ports is reduced by closing a series of valves located just before the turbine that drives the turbocharger. This reduces interference between exhaust pulses and maximizes the energy of each pulse to obtain a high turbine driving force. At higher rpms there is sufficient energy in the exhaust flow and the valves open, allowing the turbine to be driven by a steady flow of exhaust gases as in a traditional turbocharger. Whereas existing variable turbochargers adjust the speed or direction of exhaust gas flowing into the turbine, Dynamic Pressure Turbo is a unique technology that varies the degree of exhaust pulsation.
  • Cooled Exhaust Gas Recirculation (EGR)
    This system takes some of the inert exhaust gas that results from the combustion process and reduces its temperature by passing it through a cooler before introducing it back into the engine's air intake. This lowers the temperature of combustion in the engine, preventing knocking, expanding the range in which the engine can maintain the ideal air-fuel ratio and reducing the need to retard ignition timing.
  • Inherits SKYACTIV-G principals of efficient combustion
    SKYACTIV-G 2.5T is based on the naturally aspirated SKYACTIV-G 2.5 and features the same bore, stroke and bore pitch. Parts of the fuel system, such as the fuel pump and fuel injection system are also shared, helping SKYACTIV-G 2.5T to achieve the highly efficient combustion for which SKYACTIV-G engines are known.

SKYACTIV-G 2.5T Specifications (Based in-house measurements)
Inline 4-cylinder 2.5-liter direct-injection turbocharged gasoline engine
Displacement:2488 cc
Bore x Stoke:89.0mm x 100.0 mm
Compression Ratio:10.5:1
Maximum Output (net): 227HP (169kW) /5,000rpm*5
Maximum torque (net):310ft-lb (420Nm) /2,000rpm

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