Cummins new engines: 7.2L Diesel, 6.7L Turbo, and gasoline for work trucks, pickups

INDIANAPOLIS—Trucking industry trade shows have spent this decade highlighting potential zero-emission projects without mass adoption. But Cummins used NTEA’s Work Truck Week to remind the industry it is powered by internal combustion.

Along with using the exhibit hall here in its home state to launch a new medium-duty diesel engine, Cummins showed off three of its newest engines for medium-duty and vocational markets: X10 diesel, B6.7 Octane, and 6.7L Turbo Diesel.

The Cummins B7.2 Diesel engine offers 240 to 340 hp and 650 to 1,000 lb.-ft torque.

“There’s no company in America that could have a display like this. We don’t even have our heavy-duty offering here—we would need another full booth,” boasted Jose Samperio, Cummins North America on-highway VP, during a presentation. “There is no one that has this broad of portfolio of internal combustion engines in America as we do here at Cummins.”

But the big reveal was the next generation of its more than 40-year-old B-Series power platform with a new 7.2-liter diesel engine for 2027—the same year that the Environmental Protection Agency’s strictest engine regulations take effect.

The refined Cummins B7.2 diesel engine offers enhanced durability across various medium-duty applications, according to Brett Merritt, Cummins VP and engine business president.

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According to the manufacturer, the new diesel platform offers Cummins the latest technology for medium-duty and vocational applications, including pickup and delivery, utility trucks, refuse, towing, buses, and more.

The new engine features a slightly higher displacement, increasing to 7.2L. This allows a broader range of torque offerings, creating flexibility for different applications and duty cycles.

The B7.2 improves unrestricted top-end performance ratings, providing 240 to 340 hp and 650 to 1,000 lb.-ft. of torque. The engine will feature automatic engine shutdown and is stop-start capable to reduce greenhouse gas emissions. It will offer a compression release engine brake and extended oil drain interval pan option.

Cummins’ digital technology on the engine helps enhance performance and provides fleets with digital connectivity and engine data through the Acumen platform.

It will be manufactured at Cummins’ Rocky Mount Engine Plant in North Carolina.

Cummins shows off new 6.7L Turbo Diesel engine for pickups and chassis

While the 7.1L diesel engine for medium-duty trucks and vans won’t be available until 2027, the new 2025 6.7L Turbo Diesel is already available in Ram 2500 and 3500 pickup trucks.

“We continue to deliver consistently over time, innovation, durability, and power for the pickup and chassis cab truck market,” Jane Beaman, Cummins on-highway and pickup business VP, said during the exhibit hall presentation. “Today, we’re excited to introduce to you yet another engine that continues that really, really strong legacy—an engine that allows you to perform your best. Whether you’re at work or off work at home.”

The 6.7L Turbo Diesel is available for pickups and chassis cabs. It features 430 hp and 1,075 lb.-ft. torque for pickups and 360 hp and 800 lb.-ft. torque for chassis.

“We’ve integrated high-performance technologies, like a new turbocharger for a more efficient power output, newly positioned oil and fuel filters for easier service under the hood, and glow plugs for faster cold starting,” Beaman said. “It used to be 50 seconds to start. This will get you started in three seconds.”

Ram 2500 and 3500 diesel pickup trucks feature the new 6.7L turbo. Beaman said drivers will notice gains in towing, acceleration, and speed, along with a quieter, smoother ride that delivers lower tailpipe emissions.

“So whether you’re towing heavy loads or you’re just moving a camper over the weekend, this engine can get the job done,” Beaman said. “The best part is all of the engines that go into the Ram pickup truck are built right here in Indiana, in our Cummins midrange engine plant in Columbus. We’re really proud of that.”

More about Cummins X10 and B6.7 Octane engines

While diesel efficiency gets most of the attention, Cummins leaders say their first gasoline-powered B6.7 Octane engine will perform like a diesel.

The 300 hp and 660 lb.-ft. torque engine can run on 87 octane, which gives drivers more fueling convenience. It also requires less maintenance than diesel engines. Cummins said it has a 10% better fuel economy than other gasoline engines after it was validated by two million testing miles across various applications and duty cycles.

Kenworth Trucks is making the gasoline engine available for its Class 5 to 7 conventional trucks, the OEM announced during Work Truck Week. It would be paired with the Paccar TX-8 automated transmission.

Kenworth will begin offering the gasoline-powered Cummins B6.7 Octane engine in its medium-duty lineup later in 2025.

“The engine was validated against the same standards as Cummins diesel B6.7 engine,” noted Kevin Haygood, Kenworth’s assistant GM for sales and marketing. “With environmental regulations changing, it spurred us to offer another engine option to our customers. The new Cummins B6.7 Octane engine will meet stringent emission regulations, so we expect it to be a popular option in California and other states that have adopted CARB’s standards."

Haygood said Kenworth sees the engine appealing to applications such as pickup and delivery, landscaping, towing, and rental and leasing markets. He also hopes the Cummins octane addition will open up Kenworth to all-gasoline fleets that don't have the facilities set up to maintain diesel equipment.

For the hard-working truck crowd, Cummins also highlighted its heavy-duty X10 diesel, a mid-bore engine for vocational, regional-haul, transit bus, or other demanding applications. Built off the L9 and X12 platforms, the X10 is part of Cummins’ fuel-agnostic platform. It offers up to 450 hp and 1,650 lb.-ft. torque.