Cummins Logo International Logo
Contact UsRSSTwitterYouTube

Tougher Than Ever to Beat: the 2017 L9

With ratings from 260 hp to 380 hp and 720 lb-ft to 1250 lb-ft of peak torque, Cummins 2017 L9 will continue to lead its class with the highest power-to-weight ratio, offering optimized ratings for the toughest duty cycles.

New for 2017 is a 350 hp/1150 lb-ft rating that maintains more power and torque across a wider rpm range, ideal for vocational duty cycles. Further enhancements in reliability ensure that an already proven heavy-duty design continues to be the productivity champion.

Single Module™ Aftertreatment for 2017
The Single Module aftertreatment system is a customer-voice-driven design that combines the Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) systems in a single canister. This MidRange system takes up to 70 percent less space with up to 30 percent less weight than current aftertreatment systems. A new UL2 Urea Dosing System eliminates the need for engine coolant lines to and from the Diesel Exhaust Fluid (DEF) injector, reducing installation complexity and allowing for easier servicing. The injector’s proprietary atomization nozzle minimizes the risk of deposit formation, and offers a freeze-robust design and improved reliability. Furthermore, a range of systems ideally sized for the engine and rating ensures the most efficient operation, for improved fuel efficiency across a diverse range of applications.

Making the Right Engine Choice
The key to achieving the optimal combination of fuel economy and performance in any work truck is spec’ing the right engine, horsepower rating, transmission and the proper drive axle ratio – also known as the rear axle ratio. If you are spec’ing a Class 4 or Class 5 truck and weighing the choice between a gasoline or diesel engine, the general rule of thumb is that a diesel engine will deliver a lower total cost of operation in vehicles averaging 30,000 miles or more each year. Virtually all Class 6 and Class 7 truck owners will be spec’ing diesels because of the higher load factors and applications.

Getting the Perfect Spec
The first step in getting the ideal spec is to determine which kind of routes you will be running and the weight of the load. A refuse truck that rarely exceeds 25 mph in neighborhoods and has to negotiate muddy, steep ramps in a dumping zone is going to have far different demands from those of a pickup-and-delivery truck operating in a city or the suburbs, or a beverage distribution truck carrying a heavy load. The more work you require the engine to do, the higher the horsepower and torque any vehicle will need.

The second step is coupling the engine with the right transmission and spec’ing the optimal axle ratio. A high rear axle ratio provides maximum towing and payloads, and may be needed for hilly terrain with steep grades. Mid-range ratios deliver flexibility for operating on varied terrain with moderate loads, and lower ratios are the best choice when running on flat terrain, with lighter loads or running at consistent highway speeds.

Cummins PowerSpec provides a simple way to enter operating parameters into a spec’ing tool. You determine whether you want to spec the vehicle for optimal fuel economy, maximum performance or somewhere in the middle. This decision will determine the overall driveability of the vehicle, which makes a big difference in driver satisfaction. Cummins PowerSpec uses your input to provide optimized vehicle gearing, with recommended electronic features and settings to achieve operational goals.

There are two sets of gearing guidelines for the 2017 L9. Linehaul and local P&D operations with L9 engine models ranging from 260 hp to 300 hp should be spec’d with a starting rpm of 1750 rpm for maximum fuel economy, 1850 rpm for a balanced approach or 1950 for maximum performance. The upper limits of each operating mode can be seen on the chart below.

L9 engines with horsepower ratings in the 330 hp-to-380 hp range can be set to operate in a lower rpm band, starting at 1700 rpm for the maximum fuel economy setting. The greater torque allows downspeeding with these engines, which results in better fuel economy.

Parameter Setting With Cummins PowerSpec®
Cummins PowerSpec provides expert guidance for the optimization of component selection. It also gives users a complete description of the vast array of programmable features on Cummins MidRange engines, which allows operation to be customized to match duty cycles and driver preferences, and provides the tools to set up those parameters. Once you have identified the correct parameter settings for one truck, you can easily deploy that same information across an entire fleet using

For additional details, check out L9 brochure for or visit

Back to the home page


Terms and Conditions  ©2022 Cummins Inc., Direct Marketing, Mail Code 60610, 500 Jackson Street, Columbus, IN 47201 U.S.A.

We use cookies on this site to enhance your experience. By clicking any link on this page, you give consent for us to set cookies. For more information, see our Privacy and Legal page

Got it!