The next generation of L9 engines does more than just provide the power, reliability and durability you need to get the toughest jobs done. The 2021 L9 delivers class-leading power and torque ratings, an unmatched power-to-weight ratio, and the …

Cummins L9 is a medium-duty engine with heavy-duty components and performance characteristics, including an 8 percent increase in power and a 13 percent increase in torque versus the current model.

The Cummins L-series engine is a straight-six diesel engine designed and produced by Cummins. It displaces 8.9 litres (543.1 cu in), and began production in 1982 as the L10 at the Jamestown Engine Plant in Jamestown, New York.

Failure to promptly refill or replace DEF in the tank will triger an inducement sequence, limiting engine torque and, eventually, vehicle speed to 5 mph. For further details and discussion of DEF for Cummins engines, refer to Diesel Exhaust Fluid Specifications for Cummins Selective Catalytic Reduction Systems, bulletin 4021566.

We set out to ensure the EPA 2021 L9 delivered class-leading power and torque ratings, and the power-to-weight ratio to get the toughest jobs done, while also making it even more dependable.

The 2024 L9 delivers class-leading power and torque ratings, an unmatched power-to-weight ratio, and the dependability and uptime you expect from Cummins. With ratings ranges of 260 hp to 380 hp (194 - 283 kW) and up to 1250 lbft (1695 N•m) of peak torque, the L9 is designed to excel in some of the toughest duty cycles.

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With ratings ranges of 260 hp to 380 hp (194 - 283 kW) and up to 1250 lb-ft (1695 N•m) of peak torque, the L9 is designed to excel in some of the toughest duty cycles. High-strength components and features, like replaceable cylinder liners for easier rebuilding, add life to the engine and add to its residual value. DESIGNED FOR THE TOUGHEST JOBS.

The Cummins L9 is serious business, assembled with high-strength components and equipped with the latest technology to take on even the toughest medium-duty applications. The L9 also delivers outstanding fuel economy and up to 380 hp (283 kW) and …

Full torque from 1200 - 1850 rpm. Proven Performance – Building on a legacy of over 5 million C/L Series engines built, with over 30 years of continuous improvement, for total confidence. Best Power-to-Weight Ratio In Motorhomes – Leaving more capacity for what you want to bring.