Mitsubishi Introduces New Tier 4 Marine Propulsion Engine

02 September 2020

Mitsubishi Turbocharger and Engine America (MTEA) introduced its new mechanical controlled, U.S. Environmental Protection Agency (EPA) Tier 4 compliant heavy-duty marine propulsion engine.

Mitsubishi’s S12R-Y4MPTAW-3 is a 49 L, V-12 marine propulsion engine offering 1260 hp operating at 1,600 rpm. It utilizes selective catalytic reduction (SCR) technology in meeting the NOx Tier 4 emission requirements. The S12R-Y4 engine has met Tier 4 certification requirements and is available for order now.

According to Mitsubishi Marine Engine Manager Takeshi Yoshida, although most of the industry moved to complex electronic engines in 2007, Mitsubishi chose another approach: a series of mechanical engines that met the Tier 2 Environmental Protection Agency (EPA) emission regulations.

“It was remarkable that Mitsubishi met Tier 2 with a simple mechanical engine,” said Yoshida. “But when the company was able to introduce a series of Tier 3 EPA certified engines, also without the introduction of electronic controls, we all said, ‘Well, Mitsubishi has done it again.’”

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