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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 Power Stroke family of diesel engines. The T444E was manufactured from 1994 to 2003, replacing the 7.3L IDI V8 designed by International Harvester.
In line with the IDI diesel, the Power Stroke was offered in three-quarter-ton and larger versions of the Ford F-Series and Econoline product ranges. The Power Stroke is an electronically controlled, direct injection engine with a 4.11 in × 4.18 in (104.4 mm × 106.2 mm) bore and stroke creating a displacement of 444 cu in (7.3 L).
2011–present Scorpion Diesel V8—"Power Stroke" OHV 6.7 L 32-valve DI turbo diesel (F-series only) 2020–present Godzilla V8 — Pushrod V8 7.3 L (445 cu in), gasoline, naturally aspirated, port fuel injected, variable timing, 16valve, 10.5:1 compression made for F-series Super Duty models.
The model used in the Ford trucks has an internal oil pump to circulate and cool the lubricant, which is uncommon in manual transmissions. The GM versions are not equipped with an oil pump. All gears are synchronized. There is a dual cone synchronizer on 2nd and 3rd gears with an input torque rating of 520 ft-lb.
The sole gasoline engine was the 6.8L V10, while the 7.3L Power Stroke was the diesel option; in mid-2003, this was replaced by the 6.0L Power Stroke. For 2005, the F-450 and F-550 received further updates to the exterior than the rest of the Super Duty line, with an extended front bumper and front fenders; the F-550 received a "wide-track ...
For the largest Super Duty trucks (F-550/600) and the medium-duty Ford F-650/750 trucks, the engine is de-tuned to 335 hp (250 kW) at 3,750 RPM, but with more torque, 468 lb⋅ft (635 N⋅m) at 3,750 RPM. [4] The E-Series offers two versions that were de-tuned even further. The "premium-rated" version generates 325 hp (242 kW) and 450 lb⋅ft ...
Introduced for the 1983 model year, the 6.9 L diesel was the first to be offered in Ford light-duty pickups, available in the F-250 HD and F-350. Although GM pickups already had offered a diesel engine in the C10 starting in 1978 (5.7 L Oldsmobile), and across the range in 1982 (6.2 L Detroit), those engines were intended for efficiency over power.
The standard gasoline engine was a 5.4 L Triton V8; a 6.8 L Triton V10 was offered as an option. At its launch, the optional diesel engine was the Navistar-produced 7.3 L Power Stroke V8; during 2003 production, a Navistar-produced 6.0 L diesel V8 was introduced, again using the Power Stroke name.