"Stronger, lighter, leaner," is how Product Marketing Manager John Moore describes the new Volvo D11 engine. "It’s one of the most impressive things we have going."
Even though it’s 350 pounds lighter than the D13, and 21 pounds lighter than previous D11 models, the new D11 produces 20 more horsepower than before, reaching 425 hp with a maximum torque of 1550 lb.-ft. It’s up to 2.5% more efficient than previous models. (With aerodynamic improvements the savings are up to 3.5%.)
Maximum power-to-weight "That’s the highest power-to-weight ratio of any engine we have which makes it a perfect engine for regional haul applications," Moore says as he walks the floor of the Hagerstown, MD, plant where all Volvo Trucks engines are manufactured. "It can haul 80,000 pounds. In regional haul, you’re not typically climbing mountains or running consistently at highway speeds with that weight, but now with the 425 hp engine, you can when you need to."
It’s one of the most impressive things we have going
The new D11 engine was designed to match the Volvo VNR for weight-conscious, cost-conscious applications. "It’s perfect for hauling fuel or any expensive load," Moore says, "Because if you’re saving 350 pounds in engine weight, that’s 350 more pounds of load you can haul."
Waves of innovation Several improvements in engine technology explain how the engine produces more power and extra efficiency.
The new D11 features wave pistons, a patented Volvo technology that burns fuel more cleanly. A common rail fuel delivery system with proprietary features is more efficient but also lighter, quieter and more precise. Both innovations reduce friction, which means longer life for the engine – and a much quieter ride for the driver.
The D11 is also easier to service. Shimless rockers and quicker access to the exhaust aftertreatment system shrink maintenance time, which means more uptime for the truck.
Combined with a Volvo Trucks XE transmission package, the D11 is even more efficient. Lower gear ratios in the rear axles bring the engine rpms down and save fuel.
Variety of torque Split torque packages also save fuel without sacrificing performance. On flat land and in city driving the engine runs at lower torque for more efficiency. Going uphill or passing, software in the engine detects the need for power and shifts to a higher torque curve.
"We’re different from our competitors because we offer so many variations on our torque packages," Senior Product Manager Brett Pope says. "We put the highest torque right where it’s most efficient to drive."
"We’re trying to give as much value to the customer as we can," Pope says.