Proven track record The Cummins B6.7™ is one of the most dependable, durable and reliable medium-duty engines available. It’s been tested and proven with more than 12 million engines produced over nearly 40 years, with billions of miles driven. These figures aren’t just milestones either. They represent years of experience learning and optimizing the product into what we produce today – the most reliable B6.7 Cummins has ever built.

On time and on budget Cummins L9 diesel delivers outstanding productivity with the best power-to-weight ratio in its class. Heavy-duty features such as a replaceable wet liner, roller followers, bypass oil filtration and targeted-piston cooling add years of engine life. Furthermore, transit fleet managers can expect a fuel economy improvement of up to 15 percent compared to buses purchased 10 years ago.  

The L9N is the natural choice in alternative-fuel engine technology. With industry leading performance, it combines all the advantages of clean burning, low cost natural gas with “no compromises” in power and torque. The L9N  is an upgraded evolution of the proven ISL G, moving to the latest Euro 6 Phase D emissions with minimal changes retaining the impressive low-end toque, transient response and quiet operation for bus and truck applications.

It is an in-line 4-cylinder, 16-valve, 4-stroke 4.5-liter diesel engine Available for commercial and recreational propulsion applications Based on the proven Cummins B4.5L industrial engine The B4.5L complies with U.S. EPA Tier 3 emissions regulations without the use of aftertreatment Backed by Cummins warranty

Cummins’ QSK50 Tier 4 Final drilling power modules have been developed to meet the stringent measures introduced by the Environmental Protection Agency (EPA). Tier 4 Final emission standards, in comparison to Tier 3 and Tier 2, represent a significant step towards reducing nitrous oxides (NOx) and particulate matter (PM). Indeed, the QSK50 Tier 4 Final drilling power module produces 45% less nitrous oxides and 85% less particulate matter than its Tier 2 predecessor.