Power Stroke is a name used by a family of diesel engines for trucks produced by Ford Motor Company since 1994. Along with its use in the Ford F-Series (including the Ford Super Duty trucks), applications include the Ford E-Series, Ford Excursion, and Ford LCF commercial truck; the name was also used for a diesel engine used in South American production of the Ford Ranger.
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The first engine to bear the Power Stroke name, the 7.3L Power Stroke V8 is the Ford version of the Navistar DT444E turbo-diesel V8. Introduced in 1994 as the replacement for the 7.3L IDI V8, the Power Stroke/T444E is a completely new engine, with only its bore and stroke dimensions common with its predecessor (resulting in its identical 444 cubic-inch displacement). In line with the IDI diesel.
The 1994.5 to 1996/97 DI Power stroke has "single shot" HEUI (hydraulically actuated electronic unit injection) fuel injectors and ran a high pressure oil pump (HPOP) to create the necessary oil pressure to fire the fuel injectors. This generation of Power Stroke utilizes an HPOP with a 15° swash plate angle. The 1995-1997 trucks use a cam-driven fuel pump, whereas the 1999-2003 trucks use a frame rail mounted electric fuel pump. The California trucks from 1996 and 1997 have split-shot fuel injectors; other trucks did not get split-shot injectors until 1999. Single-shot injectors only inject one charge of fuel per cycle, whereas the split-shot injector releases a preliminary light load before the main charge to initiate combustion in a more damped manner.
It utilizes a single turbocharger with a turbine housing size of 1.15 A/R. In 1999, an air-to-air intercooler was added to cool the charged air from the turbo for increased air density. With the new cooler, denser air would increase the horsepower potential of the engine, while also reducing exhaust gas temperatures (EGT). Eventually, the turbine housing was changed to a .84 A/R and a wastegate was added. With larger injectors, the HPOP output was increased by utilizing a 17° swash plate angle to meet the requirements of the new, higher flowing injectors.
The 7.3L DI Power Stroke was in production until the second quarter of model year 2003 when it was replaced by the 6.0L because of its inability to meet newer emission requirements. Nearly 2 million 7.3s were produced from International's Indianapolis plant.
The 7.3 L (444 CID) Power Stroke was replaced by the 6.0 L (365 CID) beginning in the second quarter of the 2003 model year. The 6.0L Power Stroke, was used in Ford Super Duty trucks until the 2007 model year but lasted until 2009 in the Ford Econoline vans (model year 2010) and in the Ford Excursion SUVs until after the 2005 models when Ford discontinued Excursion production. The engine has a 3.74 in (95 mm) bore and 4.13 in (105 mm) stroke creating a displacement of 365 cu in (6.0 L) or 5,954 cc. It utilizes a variable geometry turbocharger and intercooler, producing 325 hp (242 kW) and 570 lb⋅ft (773 N⋅m) torque with an 18:1 compression ratio, with fuel cutoff at 4,200 rpm. Many poorly maintained or modified 6.0 L Power Stroke engines experienced problems.
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