Cummins Begins Production of First EPA Tier 4 Interim Engines; Up to 5% Improved Fuel Efficiency

EPA Tier 4 Interim and EU Stage IIIB emissions standards and effect dates vary by power category. Source: Cummins. Click to enlarge.

Cummins Inc. has begun production and supply of the first EPA Tier 4 Interim and EU Stage IIIB certified engines and aftertreatment for early installation by off-highway equipment customers. The new emissions regulations take effect 1 Jan. 2011, for engines over 173 horsepower (129 kW), with particulate matter reduced by 90% and oxides of nitrogen by almost 50% compared with the current Tier 3 and Stage IIIA standard.

Similar regulations are expected to commence in 2013 for Japan Ministry of Land, Infrastructure and Transportation (JMLIT) / Japan Ministry of the Environment (JMOE).

The QSB6.7 engine is certified to a higher power output of 300 hp (224 kW), while the QSL9 engine increases output up to 400 hp (298 kW). The 6.7-liter and the 9-liter engines have received EPA and EU emissions certification as integral systems with Cummins Particulate Filter exhaust aftertreatment, enabling integration and packaging efficiency.

Before finalization of the engine build specification for production release, the QSB6.7 and QSL9 underwent an extensive series of field tests on commercial operations to validate performance and in-service reliability. The engines achieved up to 5% improved fuel efficiency and faster engine response, boosting machine productivity.

Although much of the Tier 4 emissions technology is new to the off-highway industry, it is not new to Cummins. Key enablers, such as the Cummins Particulate Filter aftertreatment, exhaust gas recirculation and variable geometry turbochargers were available from within Cummins own technology portfolio and successfully used with our EPA 2007 on-highway engines.

With this proven technology base, we have been able to accelerate our Tier 4 Interim program and go beyond meeting stringent emissions levels to focus on performance deliverables. We have done what we said we would do by optimizing machine integration, improving fuel efficiency and enhancing engine response.

—Hugh Foden – Executive Director, Cummins Off-Highway Business

The 6.7-liter and 9-liter engines are among the most widely used in the off-highway industry within their power range. More than 30 power ratings will be available for Tier 4 Interim and Stage IIIB applications, with a wide range of installation configurations applicable to all types of construction, agricultural and industrial equipment.

In addition to approval by the US Environmental Protection Agency (EPA) and European Union (EU) regulatory agencies, the QSB6.7 and QSL9 engines have also received California Air Resources Board (ARB) certification to enable 50-state compliance.

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