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Mitsubishi

Mitsubishi Tier 4 Diesel Engines

Mitsubishi Heavy Industries Ltd. has announced its production schedule for three small diesel engines in response to approaching EPA Tier 4 regulations. The new D03CJ, D04CJ and D04EG models provide regulation-compliant solutions in the 19-kW (25-HP) to 74-kW (99-HP) output range. The Tier 4-compliant D03CJ and D04CJ will begin production in 2013, whereas the Tier 4 interim D04EG is currently available, and the Tier 4 final version will be available in 2015. Featuring a three-cylinder design, the D03CJ (1.655L) produces a maximum output of 41 kW (55 HP) and a maximum torque of 165 Nm at 1,800 rpm. The four-cylinder equivalent of this engine, the D04CJ (2.207L), produces a maximum output of 55 kW (74 HP) and a maximum torque of 230 Nm at 1,800 rpm. The power densities of the D03CJ and D04CJ are 0.24 and 0.27 kW/L, respectively.

Both engines feature an optimized common rail system with a diesel particulate filter (DPF) and diesel oxidation catalyst (DOC) for Tier 4 compliance. Common MHI goals when developing new engines are to achieve a more compact design without sacrificing power, while also lowering fuel consumption. Appropriately, compared to the previous Tier 3-compliant models being replaced, the D03CJ and D04CJ offer a smaller displacement, while output has been increased. Fuel efficiency is also 16 percent better than the previous engines.

The new Tier 4 interim, four-cylinder D04EG (3.331L) delivers a maximum output of 74 kW (99 HP) and a maximum torque of 375 Nm at 1,600 rpm, with a power density of 0.22 kW/L. The engine utilizes a common rail system including an exhaust gas recirculation system and a DPF and DOC for Tier 4 interim compliance. Compared with the Tier 3 engine it replaces, the D04EG offers 12 percent improved fuel economy.

All three new engine models are equipped with high-performance turbochargers. www.mitsubishi-engine.com


Erica Burke

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