What Is A Cummins QSK19 Engine Used For & How Much HP Does It Have?

Cummins has produced some of the most reliable diesel engines available, including its 6.7-liter turbo engine. Among the impressive lineup, the QSK19 is a true workhorse. Designed to improve upon the K19 engine, the QSK19 is a rugged, 19-liter, six-cylinder engine built to handle demanding tasks. You'll find the QSK19 engine at the heart of heavy-duty construction machines like excavators and loaders, providing the muscle needed to get the work done. In the mining sector, it drives massive haul trucks and drills, keeping operations from coming to a standstill even in challenging conditions. Over in the oil and gas sector, the QSK19 powers equipment like drilling rigs and fracturing pumps, offering reliable performance in extreme environments. 

The QSK19's strength benefits even rail transport, as it enables locomotives and rail maintenance machinery to haul cargo and operate efficiently over long distances. However, its use extends beyond land. In the marine industry, the QSK19 powers tugboats, ferries, and offshore vessels, where reliability is just as important as power. And for stationary applications, the QSK19 keeps power plants and generator sets running, ensuring a steady energy supply.

The QSK19 cranks out between 500 and 800 horsepower, depending on its configuration and intended use. However, its impressive torque — ranging from 1,775 to 2,275 lb-ft– is equally noteworthy. This substantial force ensures smooth, consistent performance under heavy loads. With a 6.25-inch (159 mm) bore and stroke, the QSK19 offers an optimal balance between power and efficiency.

Beyond raw numbers, the QSK19 is built to endure tough conditions. Reinforced components and an advanced cooling system enable it to handle extreme temperatures and heavy-duty operations. It also features Cummins' Modular Common Rail Fuel System (MCRS), which operates at injection pressures up to 1,600 bar (23,206 psi). This high-pressure system optimizes fuel economy and reduces emissions, resulting in smoother power delivery. Articulated steel pistons, 30% more durable than previous designs, significantly extend the diesel engine's lifespan. A two-stage oil filtration system, combining full-flow and bypass filtration, also helps stretch out maintenance intervals. Tough, efficient, and built to last—that's the QSK19 in a nutshell.