6.4L Power Stroke Diesel

6.4L Power Stroke Specs & Information

The 6.4L Power Stroke was introduced for the 2008 model year. Strict emissions regulations and the overall questionable reliability of the 6.0L were primary factors that presented a need for a new, clean slate engine design. Quieter and cleaner than its predecessors, the 6.4L Power Stroke was the first engine introduced to the market that utilized twin turbochargers from the factory, and remains the only engine to feature such a turbocharger arrangement. This was also the first Power Stroke to use a diesel particulate filter (DPF) in order to nearly eliminate particulate emissions (soot). The new DPF and active regeneration system greatly hindered the engine's fuel economy capability, though the engine proved to be comparatively strong and reliable.

The 6.4L Power Stroke is based on International's MaxxForce 7 engine platform. International's design moved from the dated HEUI to a common rail injection system, the heart of which is a Bosch CP4 injection pump. The engine also takes advantage of sequentially mounted twin turbochargers, which provides such benefits as reduced turbo lag and improved overall performance characteristic. Learning from problems with the 6.0L Power Stroke, the 6.4 features larger M16 head bolts and the 4 bolt-per-cylinder design is favorably positioned for superior clamping force.

Although the cleanest and most powerful engine supplied to Ford by International, it would also be the last as Ford would begin offering their own design beginning the 2011 model year. The emissions equipment on the 6.4L proved to significantly reduce fuel economy compared with previous generations, and as such was the source of many complaints. Aside from this, the engine's are relatively reliable and possess good, honest performance characteristics.

6.4L Power Stroke Specs

Engine:

6.4L Power Stroke diesel V-8

Years Produced:

2008 to 2010 model years

Displacement:

6.4 liters, 390 cubic inches

B50 Life:

375,000 miles*

Block/Head Material:

Cast iron block, cast iron cylinder heads, M16 head bolts, 4 bolts per cylinder

Compression Ratio:

17.5 : 1

Firing Order:

1-2-7-3-4-5-6-8

6.4L Power Stroke cylinder numbers

Bore:

3.87 in (98.2 mm)

Stroke:

4.134 in (105 mm)

Aspiration:

Turbocharged, twin sequential turbochargers, intercooled

Injection:

Direct injection, high pressure common rail, Bosch CP4 injection pump

Valvetrain:

OHV pushrod valvetrain, 4 valves per cylinder (32 valve), conventional single cam in block

Oil Capacity:

15 quarts w/ filter

Engine Weight:

Approx. 1,130 lbs w/ oil

Emissions Equipment:

Exhaust gas recirculation (EGR), diesel oxidation catalyst (DOC), and diesel particulate filter (DPF) with active regeneration system

Fuel Requirement:

ULSD (ultra low sulfur diesel) only, B5 biodiesel compatible

Gov. Engine Speed:

~ 3,700 rpm

Peak Horsepower:

350 hp @ 3,000 RPM

Peak Torque:

650 lb-ft @ 2,000 RPM

Engine Dimensions:

Length:

32" (approx)

Width:

34" (approx)

Height:

38" (approx)

*B50 life based on published data for International's MaxxForce 7; the 6.4L Power Stroke is a derivative of the MaxxForce 7.

6.4L Power Stroke Twin Turbocharger Operation

6.4L Power Stroke twin turbo arrangement

Arrangement of the high and low pressure turbochargers on the 6.4L Power Stroke
Image copyright© Ford Motor Company

6.4L Power Stroke Horsepower/Torque Curves

6.4L Power Stroke horsepower & torque

6.4L Power Stroke diesel horsepower & torque curve.

6.4L Power Stroke Engine Serial Number Location

The serial number for a 6.4L Power Stroke engine is located on a half moon shaped section of the engine block on the driver's side, rear of the engine. A sticker that is applied during production will need to be removed in order to see the serial number. The first two digits will read "6.4", followed by a four digit manufacturing designator (HU2Y for engines built in Huntsville, AL and HU2U for engines built in Indianapolis, IN), and the final 7 digits are the sequential build number. The same information is also available on the front of the engine, on a sticker mounted on the EGR cooler. Here you will find the plant at which the engine was produced as well as the build number (build number is the last 7 digits of the number posted just above the lower bar code).