Tier 4 small diesels coming from MHI

  • 28-Sep-2012 11:43 EDT
Mitsubishi Heavy Industries D03CJ.jpg

The D03CJ (pictured) and D04CJ both feature an optimized common-rail system with a diesel particulate filter (DPF) and diesel oxidation catalyst (DOC) for Tier 4 compliance.

Mitsubishi Heavy Industries, Ltd. (MHI) has announced the production schedule for its new Tier 4 small diesel engines in the output range of 19 to 74 kW (25 to 99 hp). The Tier 4 compliant D03CJ and D04CJ will begin production in 2013; the Tier 4 interim D04EG is currently available, and the Tier 4 final version will be available in 2015. These engines will be suitable for a variety of construction, agricultural, and industrial equipment, such as compressors, generators, welders, off-highway equipment, material handling, etc.

Compared to the previous Tier 3 compliant models being replaced, the D03CJ (1.655 L) and D04CJ (2.207 L) offer a smaller displacement, while output has been increased. The three-cylinder D03CJ produces up to 41 kW (55 hp) and 165 N·m (122 lb·ft) at 1800 rpm. The four-cylinder D04CJ produces a maximum of 55 kW (74 hp) and 230 N·m (170 lb·ft) at 1800 rpm. Fuel efficiency is reportedly 16% better than the previous engines.

The new Tier 4 interim, four-cylinder D04EG (3.331 L) delivers up to 74 kW (99 hp) and 375 N·m at 1600 rpm, with a power density of 0.22 kW/L. Compared with the Tier 3 engine it replaces, the D04EG offers 12% improved fuel economy. To achieve Tier 4 final compliance in the 57- to 74-kW (76- to 99-hp) range, MHI currently plans to incorporate a selective catalytic reduction (SCR) system.

All three new engine models are equipped with high-performance turbochargers, manufactured at the same plant that the engines are produced. Combined with a new optimized common-rail system, the engines achieve an enhanced power density that increases output up to 50% compared with the previous Tier 3 compliant engines, MHI claims.

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