Ford is leading the truck diesel revolution with the first clean diesel engine offered in a full-size pickup truck. The new Ford-exclusive 6.4-liter Power Stroke® turbo-diesel is quieter, powerful and more capable, yet it still meets stringent new emissions regulations thanks to Ford Clean Diesel TechnologyTM.
The 6.4-liter Power Stroke clean-diesel delivers 350 horsepower at 3,000 rpm, 650 foot-pounds of torque starting at 2,000 rpm and has particulate emissions on par with gasoline engines - a 97 percent reduction from the 6.0-liter. It has also been tested the equivalent of 10 million miles on road and in the lab, helping ensure excellent long-term durability.
"No diesel engine has ever delivered this much power and refinement with such clean emissions," said Rick Renwick, Diesel Powertrain chief engineer. "We didn't compromise on anything."
A tough, cast iron block and heads provide a strong, durable foundation for making power and torque. A new cylinder head design and piston bowl design optimize the high-cylinder pressures delivered by the high-pressure fuel system. The higher pressures provide more efficient combustion, delivering increased power and cleaner emissions.
The pistons mount to the forged-steel crankshaft with larger, stronger rods that feature an increased rob bearing diameter. The pistons are galley-cooled for increased durability.
Two sequential turbochargers provide improved throttle response throughout the entire power band with better low-end performance. Tests have shown zero-to-60 times of more than a second faster than the outgoing 6.0-liter Power Stroke diesel.
A smaller, variable geometry turbocharger comes on at low rpm to provide extra boost at take-off. As engine speed increases, the larger fixed turbo joins the smaller turbo to boost power through the middle of the torque curve. As optimum speed is reached, the larger turbo takes over. The system can deliver up to 42 pounds of boost.
Ultra-low-sulfur diesel fuel is fed to the engine via a state-of-the-art, high-pressure common rail fuel injection system. Fuel pressurized to 26,000 psi is injected into the cylinders through Piezo-electric injectors. The latest in injector technology can deliver up to five injections per combustion cycle to better control emissions, provide instant response for optimized acceleration and improve cold start down to -20F.
Dual 440 mm exhaust gas recirculation (EGR) coolers feature an air oxidation catalyst that literally scrubs the exhaust gasses to protect coolers against fouling and EGR valve deposits.
The Power Stroke's engine control module (ECM) has been improved for 2008. Fuel controls and engine controls are now integrated into the same, rugged cast aluminum housing, enabling proper operation of the state-of-the-art engine technologies. The ECM durability tests were increased by two times to insure robustness.
The highly efficient, exhaust system combines engine and emissions-control technologies such as the diesel particulate filter (DPF) and oxidation catalyst into a close-knit system, removing nearly 97 percent of the diesel particulate.
A larger fuel filter better separates water from the fuel, an important asset with the increasing availability of biodiesel.