• Oct 23rd 2007 at 1:25PM
  • 9
Today's press release from Ford about the company's "New 6.4-liter Power Stroke® diesel" engine is not the first time we're hearing about the "Cleanest, Quietest Power Stroke Engine Ever." But, with Ford's Clean Diesel Technology, the engine now is more powerful and cleaner than ever before, something Ford is quite proud of. The company's Diesel Powertrain chief engineer, Rick Renwick, says that, "No diesel engine has ever delivered this much power and refinement with such clean emissions. We didn't compromise on anything."

Using ultra-low-sulfur diesel (ULSD), the 6.4-liter Power Stroke offers 350 horsepower at 3,000 rpm, 650 foot-pounds of torque starting at 2,000 rpm all while spitting particulate emissions "on par with gasoline engines – a 97 percent reduction from the 6.0-liter." A diesel particulate filter (DPF) and an oxidation catalyst help keep things cleaner.

Release available after the jump.

[Source: Ford]


  • New 6.4-liter Power Stroke® diesel with Ford Clean Diesel Technology™ provides an increase in performance with a sharp decrease in particulates and emissions
  • Sequential turbochargers improve off-the-line performance with smooth acceleration through the power band
  • High-pressure, common rail fuel system with Piezo-electric injectors delivers quiet operation without compromising performance
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 Technology™.

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 –20°F.

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.

Keeping it cool increases power and durability

The Super Duty cooling system has been designed to handle extremes. Engineers based the system tests on the F-550 chassis cab's pulling gate of 33,000-pounds, combined weight. Super Duty's radiator has grown by 33 percent and a larger water pump nearly doubles the coolant flow rate from 75 to 140 gallons per minute.

"We have designed the industry's most robust cooling system to provide maximum power and torque under extreme operating conditions," said Renwick.

An all-new engine from an all-new development process

The 6.4-liter diesel is more than just a clean-sheet-of-paper engine. It benefits from a new development process optimizing durability, performance, fuel economy and emissions.

The engineering team began by collecting real-world data from working Super Duty commercial customers, tracking their daily duty cycles to ensure the development process more accurately reflected real-world use.

The data was used to develop durability tests that were more representative of these real-world duty cycles. For example, this engine program marked the first time that dynamometer tests were run with the transmission bolted to the engine during the durability run, allowing engineers to see how the up-shifts and downshifts affected the powertrain during the duty cycle.

The tests were conducted using the most extreme and abusive conditions and run to five-times the life cycle that the hardest-working truck would ever experience, further assuring durability.

"When we launched the new truck earlier this year, the engine had already seen more than 10 million equivalent miles of testing both on the dynamometer and on the road," said Renwick.

The extended testing hours allowed the team to scrutinize every component and system under theses customer-driven conditions. As a result, more than 500 design improvements were made to the diesel powertrain to improve performance and durability.

Powertrain options include the segment's most powerful gasoline engine
The all-new 6.4-liter diesel joins a proven gasoline powertrain lineup that includes the 6.8-liter, three-valve Triton™ V-10 that makes 362 horsepower and 457 pound-feet of torque – both class-leading figures.

Customers also can choose Ford's modular 5.4-liter, three-valve Triton™ V-8 that delivers 300 horsepower and 365 pound-feet of torque. More than 80 percent of peak torque – nearly 300 pound-feet – is available starting as low as 1,000 rpm.

Both engines benefit from electronic throttle control, which provides economy and performance benefits. For commercial users who need elevated engine speed to run aftermarket power takeoff (PTO) systems, the "stationary elevated idle control" feature is available on all models.

The gasoline engines feature all-new exhaust systems and newly designed air boxes that mount solidly to the new modular front structure. Transmission choices include a 6-speed manual with overdrive or a TorqShift™ 5-speed automatic. The transmissions utilize a new, unique mounting system that better isolates the powertrain and reduces vibration.

Transmissions feature all-new gear sets and a three-plate, two-stage torque converter to reduce turbine noise when the converter is locked. The F-450 uses upgraded synchronizers to enable electronic shift on the fly.

About Ford Motor Company

Ford Motor Company, a global automotive industry leader based in Dearborn, Mich., manufactures or distributes automobiles in 200 markets across six continents. With about 260,000 employees and about 100 plants worldwide, the company's core and affiliated automotive brands include Ford, Jaguar, Land Rover, Lincoln, Mercury, Volvo and Mazda. The company provides financial services through Ford Motor Credit Company. For more information regarding Ford's products, please visit www.fordvehicles.com.

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    • 1 Second Ago
      • 7 Years Ago
      I have a 2008 F-450 with the 433's. My friend and I both pull a forty foot toy hauler. I get 6.8mpg and gets 11.9mpg with his 2007 6.0L F350-Dually. Any tips to improve MPG?
      • 7 Years Ago
      I have been a GM guy forever and I must say that although the cost of my 08 350 Super Duty was cheaper than the equivalent GM, I am really dissapointed with the mileage and power. We towed an empty 28 foot trailer to Bristol Tn , about 850 miles from Toronto and back. We averages 21 ltrs per 100 Km.

      That was 450 km per tank of diesel or 520 miles per tank. For our return trip, we took a smoother and less hilly route ( I 75 ) as the truck lacked power and really struggled up the hills.

      Truck has 20k on it. I am really surprised. All my friends have GM's and warned me about this.

      tp from toronto

      • 7 Years Ago
      No it doesn't top out at 2500 since they state 350 horsepower at 3,000 rpm. Redline is probably above that but I don't know what the max engine speed is but it's probably around 4000 rpm givin the engine size. It will probably geared to make good use of that 650Lb/ft @ 2000rpm anyway. Total apples and oranges anyway as the Touareg isn't built for heavy hauling. I was a bit flippant with MikeW as he didn't even get the specs straight.
      • 7 Years Ago
      Hey Tim,

      They say "starting at 2,000 rpm", but they didn't say the engine tops out at 2,500 rpm.
      • 7 Years Ago
      Touareg R50 346hp@3500, 627ft-lbs@2000, 4300 redline.
      Ford F-450 with 6 speed stick (or auto & 4.88 axle ratio) 325hp@3000, 600ft-lbs@2000

      It seems like Ford needs to ditch the serial turbocharger arrangement.
      • 7 Years Ago
      I don't want Ford to fail. They should outsource a high torque 6 speed auto (or make one themselves). How about the one Bentley uses in the Brookland-that engine makes 774ft-lbs@3250
      Ford could have remade (a few years ago) the 6.0, screw torque, 400hp@4000rpm, 600ft-lbs@2000rpm. That would be fun, but not in keeping with its commercial bias.
      Usually commercial/industrial diesel engines have two redlines, max engine speed under load, and in overrun (it is lower under load)
      The old 6.0 didn't make any power above 3600rpm (good auto shift point, lower with a stick), and by 3750 power is completely gone.
      The new 6.4 doesn't rev as high as the old 6.0.
      and Ford derates the 6.4 for the manual transmission, and for the shortest axle ratio (probably driveshaft resonance 'issues')
      • 7 Years Ago
      Sounds like Ford does not want a repeat of the 6.0l diesel problems they had.

      MikeW when the Touareg can haul around 33,000Lbs of combined vehicle weight then we'll talk.

      BTW that was 350 horsepower at 3,000 rpm, 650 foot-pounds of torque starting at 2,000 rpm.
      • 6 Years Ago
      I bought a 2008 f-550 6.4 in 05/08 I put 5 cords of wood on it and it would not move i had to put it in 4 wheel to get started. I had to trade it in for a f-350 6.4 because they had computer problmes and they could not fix it because their computer was wipeing out the one in the truck and they did not have a new computer to put back in it . The 6.4 is one piece of junk it will not heat in the winter ford said that it will not unless it is under load or i have to pay 500.00 to install a pre heater i think if they sell a truck in the north country it should have heat. The 4 wheel drive had to be fixed 4 days after i bought it .Then the alternater and the thermostates and still no heat.Fuel mileage is 7.4 and i have 11,000 miles on it the truck is started to rust on the doors and bumpers and running boards.For 43.000 i think that ford could give us a little quality in what we buy .I had a f 350 v 10 2003 10 miles to a gal. but it was a better truck than my 6.4 my next truck will be a V10 used i will never buy a new one again.
      • 7 Years Ago
      Regarding MikeW's comments: I am also a hard core Chevy guy. However, a close friend of mine has two 2008 6.4 L Powerstrokes, one 350 and one 450. He is pulling huge combined vehicle and trailer loads (over 50,000 lbs with the 450 and over 30,000 with the 350). He is having NO problems with power and is getting about 8 mpg at 50-55,000 lbs gross over the highway in hilly country. His net payloads are close to a true semi and his ability to pull hills is way better.
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