By: Mike Levine Posted: 07-23-08 09:11 PT
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Sources say Ford continues to make good progress testing its upcoming in-house-designed 6.7-liter V-8 diesel engine. The new engine will replace the Navistar-sourced 6.4-liter V-8
Power Stroke diesel engine in Ford's heavy-duty pickups by 2011. Code-named Scorpion, the new motor is said to pack plenty of sting -- plus a few other surprises.
The latest power targets are said to be more than 390 horsepower and 720 pounds-feet of torque. Today's Power Stroke diesel is rated at 350 hp and 650 pounds-feet.
Scorpion fuel economy is expected to improve by 3 mpg or more compared to the current Power Stroke. Helping the Scorpion's mileage will be a new six-speed automatic transmission, like the 2009 Ford F-150 will have.
The Scorpion is said to share several key traits with GM's revolutionary new 4.5-liter Duramax V-8 diesel engine. Intake and exhaust flow through the cylinder heads is reversed (relative to conventional diesel engine design) with the exhaust
exiting directly into dual sequential turbos sitting in the engine's valley. The Scorpion will also use lighter aluminum cylinder heads, abandoning the cast-iron heads found in today's 6.4-liter Power Stroke.
Unlike the Duramax, the Scorpion diesel will continue to use an overhead valve engine design, rather than overhead cam.
The new 6.7-liter diesel engine will be manufactured in Mexico.
How important is this motor? The move is expected to permanently end Ford's longtime use of Navistar-built diesel engines in its heavy-duty pickups, due to an ongoing legal battle between the two companies over warranty and cost issues related
to the old 6.0-liter V-8 Power Stroke (model years 2003-07). Ford has used Navistar diesels in its F-Series trucks since 1982.
It's not yet known if the Scorpion will continue to use the Power Stroke name or if Ford will create a brand new label for the engine. Whatever it's called, Ford's competitors are sure to feel the Scorpion's sting!