How Optimizing Cylinder Deactivation Cut NOx Emissions 74% in Cummins-Tula Test
Cummins Buying Jacobs
Cummins is buying Jacobs Vehicle Systems — which today does far more than exhaust brakes — to help it advance on the road to zero emissions.

Jacobs has two primary manufacturing facilities in Bloomfield, Connecticut, and Suzhou, China, and Cummins expects to invest additional capacity and resources into those operations.
Photo: Jacobs
To help it in development of current and future advanced diesel engine platforms, Cummins is buying Jacobs Vehicle Systems. Best known for the Jake Brake, today Jacobs also provides cylinder deactivation, start-and-stop and thermal management technologies.
It's a homecoming of sorts; in 1961, Jacobs introduced the first engine brake for commercial vehicles, which was invented by Clessie Cummins, the founder of Cummins.
The acquisition is part of Cummins’ continuing investment in key technologies to reduce greenhouse gas emissions and lower the air quality impacts of their products. Engine braking and cylinder deactivation technologies will be key components to meeting current and future emissions regulations. This acquisition will allow Cummins to better integrate these vital components with its medium- and heavy-duty engines. Both Cummins and Jacobs have also been working with Tula to test more sophisticated algorithms for cylinder deactivation technology.
The acquisition of the Altra Industrial Motion subsidiary also secures engine components for current and aftermarket products, and expands the Cummins Turbo Technologies’ business unit, Cummins officials said in a press release.
Jacobs has two primary manufacturing facilities in Bloomfield, Connecticut, and Suzhou, China, and Cummins expects to invest additional capacity and resources into those operations. Jacobs’ manufacturing footprint will help Cummins meet requirements of the United States-Mexico-Canada Agreement and further invest in the U.S.
Jennifer Rumsey, Cummins’ president and chief operating officer, said she expects the transaction to provide financial returns and future growth opportunities through Jacobs’ engineering expertise, product portfolio and manufacturing capabilities.
Cummins plans to maintain Jacobs’ customer relationships.
Founded in 1961, Jacobs has roughly 600 employees and more than 60 years of experience in engine retarding and valve actuation systems for the commercial vehicle industry.
This acquisition is subject to customary closing conditions, including receipt of applicable regulatory approvals, and is expected to close in 2022.
More Equipment

Historic, Vintage, and Antique Trucks at the 2026 ATHS Convention
More than 500 trucks were on display, indoors and out, at the 2026 American Historical Society annual convention in Springfield, Missouri.
Read More →
DTNA Software Update Gives Truckers More Time Before DEF Derates Take Effect
The changes reflect EPA guidance aimed at reducing downtime caused by emissions-system faults while maintaining compliance requirements.
Read More →
Great American Trucks: The International MaxxPro MRAP
Built from an International WorkStar chassis and powered by a MaxxForce diesel, the MaxxPro MRAP became one of the most important military trucks of the Iraq War era.
Read More →
New Mack Granite Cab Puts Driver Comfort Front and Center
Mack’s next-generation vocational truck features a roomier cab, premium seating, advanced steering technology, and a driver-focused interior designed with direct input from professional operators.
Read More →
Mack Unveils Fan-Selected Patriotic NASCAR Pioneer Wraps
Racing fans picked the patriotic design now featured on three Mack Pioneer trucks hauling NASCAR equipment across the country during the 2026 season.
Read More →
Michelin Expands X Line Grip D Tire Line
Michelin is expanding its X Line Grip D drive tire lineup with a new pre-mold retread and additional sizes, building on what the company says is strong fleet adoption of the tire's traction, mileage, and fuel-efficiency benefits.
Read More →
Engine Technology Forum Launches SCR, DEF Resource Center Amid Emissions Debate
The Engine Technology Forum’s new online hub aims to provide fleets, policymakers, and equipment owners with fact-based information about selective catalytic reduction technology, diesel exhaust fluid and emissions compliance.
Read More →
Prime Inc. to Open $7.9M Flagship Used-Truck Dealership
A new driver-focused facility to sell Prime Inc's used trucks and trailers will be the first purpose-built location in the company's history.
Read More →
Lessons Learned About Alternative Fuels: Start Small, Stay Flexible
Practical advice on adopting alternative fuels and ZEVs from HDT's 2026 Top Green Fleets, from renewable diesel and natural gas to electric trucks.
Read More →
Kenworth Names Peter Ahrens General Manager
Leadership changes at Kenworth take effect July 1 as the OEM promotes two longtime Paccar executives to key management roles.
Read More →
