VIDEO: New Ford 6.7-liter Diesel Engine Quietness

DEARBORN, Mich., Sept. 23, 2009 – People who know diesel engines are familiar with, and expect, the noisy clatter generally associated with diesels. That is, until now. When Ford's new 6.7-liter Power Stroke® diesel engine debuts in the 2011 Super Duty lineup, it's expected to be the quietest, smoothest diesel on the market, outperforming its closest competitors by several decibels.

Engineering and design improvements to the all-new Ford-engineered, Ford-tested and Ford-built 6.7-liter Power Stroke® turbocharged diesel engine – debuting in the 2011 F-Series Super Duty – eliminate the harsh sounds of the typical diesel to make it one of the quietest and smoothest diesels on the market. Significantly quieter than its toughest competitor, the 6.7-liter diesel challenges traditional views about how diesels should sound.

"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.

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