Engineering:Navistar T444E engine

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Navistar International logo.svg T444E
ManufacturerNavistar International
Also calledFord PowerStroke diesel
Configuration90° V8
Displacement444 cu in (7.3 L)
Cylinder bore4.11 in (104.4 mm)
Piston stroke4.18 in (106.2 mm)
Block materialCast iron
Head materialCast iron
ValvetrainOHV, two valves per cylinder
Compression ratio17.5:1
Fuel systemDirect injection and hydraulic electronic unit injection
Fuel typeDiesel
Cooling systemWater-cooled
Power output175–275 hp (130–205 kW)
Torque output425–525 lb⋅ft (576–712 N⋅m)
Dry weight920 lb (417 kg)
PredecessorInternational Harvester IDI
SuccessorNavistar VT365
Ford 6.0 L PowerStroke V8

The Navistar T444E is a diesel V8 engine manufactured by Navistar International Corporation. In its use in Ford Motor Company trucks, vans, and school buses, it is the first of the PowerStroke family of diesel engines. The T444E was manufactured from 1994 to 2004, replacing the 7.3 L IDI V8 designed by International Harvester. As a result of federal emission standards, the T444E was discontinued midway through the 2003 model year, replaced by the all-new 6.0 L VT365. In total, nearly 2 million 7.3 L PowerStroke V8s were manufactured for Ford at their Indianapolis, Indiana plant before switching to the 6.0 L.

The T444E used a 4.11 in × 4.18 in (104.4 mm × 106.2 mm) bore and stroke. Power output was 210 hp (157 kW) at 3000 rpm and 425 lb⋅ft (576 N⋅m) at 1600 rpm for 1994-1997. Power was increased in 1998 to 235 hp (175 kW) at 2600 rpm and 500 lb⋅ft (678 N⋅m) of torque at 1600 rpm. In 2000, power was once again upped to 250 hp (186 kW) at 2700 rpm in automatics and 275 hp (205 kW) in manuals, and 525 lb⋅ft (712 N⋅m) of torque at 1600 rpm.


  • 1994.5-1997 Ford F-250/F-350
  • 1999-2003 Ford Super Duty (2001-2006 in Australia)
  • 2000-2003 Ford Excursion
  • 1994.5-2003 Ford E-Series
  • 1994-2003 International 3400/3600/3700/3800 bus chassis
  • 1994-2003 International 3000 bus chassis
  • 1994-2003 International 4700/4900 cab/chassis

External links

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