Cummins Westport Inc. (CWI) has received certifications from both the U.S. Environmental Protection Agency (EPA) and California Air Resources Board (CARB) for its 2018 L9N and B6.7N natural gas engines. According to the company, both engines now meet CARB optional Low NOx standards, as well as 2017 EPA greenhouse gas emission (GHG) requirements.
The L9N is certified to CARB optional Low NOx standard of 0.02 g/bhp-hr – a 90% reduction from engines operating at the current EPA NOx limit of 0.2 g/bhp-hr. The L9N offers ratings from 250 hp to 320 hp and 1,000 lb-ft peak torque, making it ideal for transit, shuttle, school bus, medium-duty truck and refuse applications, according to CWI.
The B6.7N is certified to CARB optional Low NOx standard of 0.1 g/bhp-hr – a 50% reduction from current EPA levels. Available with ratings from 200 hp to 240 hp and 560 lb-ft peak torque, the B6.7N is a great fit for school bus, shuttle, and medium-duty truck applications, CWI adds.
Based on the ISL G and ISB6.7 G natural gas engines, the 2018 L9N and B6.7N build on the experience gained from over 80,000 CWI engines currently in service. In addition to ultra-low emissions, the company says, the L9N and B6.7N feature a new engine control module with improved durability, on-board diagnostic (OBD) capability, an enhanced maintenance-free three-way catalyst, and a closed crankcase ventilation system.
Rob Neitzke, president of CWI, comments, “Natural gas engines are a mature technology and are supported by an established fueling and supply infrastructure, enabling fleets to incorporate near-zero emissions technology into their fleets. Cummins Westport’s new 2018 products mean our customers can choose the most affordable path to zero-equivalent emissions with no commercial constraints on supply or technology readiness.”
All CWI engines offer customers the choice of using compressed natural gas (CNG), liquefied natural gas (LNG) or renewable natural gas (RNG) as a fuel. The company says that combining its ultra-low-emission engines with RNG fuel provides additional and significant GHG reductions.
For 2018, the L9N and B6.7N will be available as a first-fit option from bus and truck manufacturers. CWI says it will also introduce the ISX12N natural gas engine as a first-fit option, which like the L9N, will meet the optional Low NOx emissions level of 0.02 g/bhp-hr. Production of all three engines will begin in the first quarter of 2018.
CWI notes it would like to acknowledge engine development funding support from the Gas Technology Institute, the South Coast Air Quality Management District, SoCalGas, and the California Energy Commission.