Cummins has announced its entire line of on-highway engines have been certified by the Environmental Protection Agency (EPA) for meeting the emissions regulations for 2010 engines now in effect.

Cummins line includes the Heavy-Duty Big Bore ISX15 and mid-range ISB6.7, ISC8.3 and ISL9 engines. The engines use selective catalytic reduction (SCR) to reduce oxides of nitrogen (NOx) and particulate matter (PM) below levels of 0.2 grams and 0.01 grams per brake-horsepower-hour, respectively.

“Receiving the formal certificates is an important step in the process as we enter 2010 with customer-ready products,” said Jim Kelly, president, engine business. “This confirms that customers can be confident in the technology choice we’ve made to meet the new, more stringent emissions standards.”

The engines will include an enhanced cooled EGR system with a single VGT Turbocharger. The ISX15, ISL9 and ISC8.3 feature Cummins’ XPI fuel system. The ISB6.7 features a high pressure common rail fuel system. The SCR catalyst is included with the Cummins particulate filter in the Cummins aftertreatment system. The system utilizes diesel exhaust fluid (DEF) at the rate of 2% of diesel fuel consumption.

“Our decision to use SCR technology has given us the ability to provide customers with the most fuel efficient engines for on-highway applications,” Kelly said. “We expect to see at least 5% fuel economy improvement for the ISX15 and up to 3% improvement for the mid-range products.”

Cummins will produce an engine designed for vocational and less-than-truckload markets later this year. The ISX11.9 is slated for limited production in mid-year, the company said, with full production set for late summer. That engine will be submitted for certification as its launch date approaches.