Diesel engines in heavy-duty pickup trucks are known for a lot of qualities, such as extremely good torque. They generally are not associated with quietness. The all-new new Ford 6.7-liter Power Stroke^® diesel engine debuting in the 2011 Super Duty lineup may change that. It’s expected to be the quietest, smoothest diesel in the segment, outperforming its closest competitors by several decibels.

How much quieter is it? Watch and listen to the video below to compare the sound of the new Power Stroke engine to its predecessor. 

“Historically, consumer perception has been that diesels should sound rough and tough, but from a sound quality perspective they were actually loud and unrefined,” said Scott DeRaad, engine NVH (noise, vibration and harshness) engineer.  “At Ford, we approached the new diesel development as though it was more than a work truck and something that people wanted to drive, making ‘quieter’ a reason to buy.”

Most of the improvement in NVH comes from changes made to the combustion system and the structural integrity of the compacted graphite iron block, as well as from mounting one turbocharger on the engine block instead of two. Specific design upgrades were made to both the piston and the piston bowl to optimize the combustion process, which features a two-stage combustion event instead of a single-injection event, causing harsh, sudden and loud combustion.  Instead, a starter or pilot injection of fuel begins the compression process before the main injection.

The new diesel is also designed to deliver other significant improvements, including better torque and horsepower, class-leading fuel economy and best-in-class towing and payload for unparalleled performance.

Read the article on the all-new, Ford-engineered 6.7-liter Power Stroke engine by clicking here.