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Ford 6.7L Powerstroke Diesel Engine - Code Name: Scorpion

Ford's New 6.7L Power Stroke

Photography by Courtesy of Ford Motor Company

You're looking at Ford's all-new 6.7L Power Stroke engine (code named Scorpion) that will debut in the 2011 Super Duty, due out in the first quarter of 2010. New engine programs like this don't happen very often, so Ford invited us into its Beech Daly Tech Center in Dearborn, Michigan, to give Diesel Power readers the first look at the next Power Stroke.

What Happened To International?
Ford says in order to stay competitive and profitable in the diesel segment, it needed to develop its own in-house diesel engine program. Ford and International have worked together for more than 30 years and have sold more than 3 million Power Stroke engines in Ford trucks. Ford and International will continue to do business together in the medium-duty truck market as partners in the Blue Diamond joint venture, as well as in other markets outside of North America.

Ford's First Diesel
Ford has been working on single-cylinder diesel engines in its labs since 2001 and has built diesel engines in Europe for years. Ford partnered with the Austrian engineering firm AVL to conceptualize the 6.7L Power Stroke's design back in 2006. The first prototype engines were running by 2007. While most engine programs take 36 to 48 months, the new Power Stoke was said to be completed in 24 months. When it goes into production, the new engine will be built in Chihuahua, Mexico.

The 6.7L engine block is cast from compacted graphite iron-a first in this segment-by Tupy for reduced weight and increased strength. Tupy also does the initial machining of the casting, called super cubing, before shipping them to Ford. The block has a deep-skirt design that eliminates the bedplate used on the 6.0L and 6.4L Power Stroke. The cross-bolted main bearing caps are made of nodular iron and hold the forged steel crankshaft in place with six bolts each.

Mahle builds the forged connecting rods with cracked caps, but they are not powdered metal as we had expected. The rods have their large bearing journals clocked slightly (like the Cummins) in order to fit the big end in the deep-skirt block. The cast-aluminum pistons are made by Federal Mogul and use offset pins and a single oil galley for cooling. The compression ratio is 16.2:1, making it lower than either the 6.6L Duramax, or 6.7L Cummins engines. The oil pan holds 13 quarts of 15w-40 conventional oil, which is two quarts less than the older Power Strokes. The 6.7L is said to be 160 pounds lighter than the current 6.4L, meaning the engine will weigh more than the Duramax, but less than the Cummins.

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