Navistar VT engine

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International VT365

Also called:	Power Stroke
Manufacturer:	International Truck and Engine Corp., a Division of Navistar
Production:	2003–2006
Predecessor:	International T444E
Successor:	6.4 L Ford V8
Class:	Diesel
Engine:	6.0 L V8
Similar:	Cummins B Series

The International Truck and Engine VT 365, also sold as the Ford Power Stroke, is a Diesel V8 engine. It is used as the Power Stroke in Ford's F-Series Super Duty and under the International name in the International MXT trucks. The 6.0 L Power Stroke turbodiesel was on the Ward's 10 Best Engines list for 2003.

It is a 32-valve pushrod V8. Bore is 3.74 in (95 mm) and stroke is 4.13 in (105 mm). Output was 325 hp (242 kW) at 3300 rpm and 560 ft·lbf (759 Nm) at 2000 rpm, but as of 2005 that was increased to 570 ft·lbf at 2000 rpm. It also uses a 2nd generation HEUI (oil common rail) direct injection fuel system, as well as a variable-geometry turbocharger, which is designed to reduce turbo lag and create better throttle response.

The 6.0 L VT365 replaced the 7.3 L T444E, also built by International in Indianapolis, but has not been as successful. A high number of warranty claims (US$50,000,000 in two years) caused Ford to discontinue their contract with International Truck and Engine to build a Diesel V6 and paying US$70,000,000 to International Truck and Engine as compensation for ending the contract. Ford considered International Truck end Engine rival, Cummins, before deciding to design this new Diesel V6, now known as the DT17, in-house.

Although the engines have been plagued by problems, Ford still sells 250,000 or more each year at a $5,300 premium over the gasoline engine options in its Super Duty trucks. The problems include leaky fuel injectors, oil leaks, and sticking turbocharger vanes. There have been 77 technical service bullitens related to the engine since its introduction.

An optional TorqShift 5-speed automatic transmission is available for Ford trucks. This special transmission gives improved performance to the engine, featuring a tow/haul mode (for example).[1]

1 VT275
2 6.4
3 Applications
4 References
- 4.1 Notes
5 See also

[edit] VT275

A variant of the VT365 is the new VT275 4.5 L V-6, which is basically a 6.0 L V-8 with two cylinders chopped off. However, it uses a sequential twin-turbocharger system, instead of the single variable-geometry turbocharger used in the VT365. It is used in the new 2006 Ford LCF (Low Cab Forward) and International CF (Cab Forward) series trucks. It produces 200hp and 440 ft/lb of torque and is backed by a Ford TorqShift 5 speed automatic.

[edit] 6.4

The 6.4 L Power Stroke, due out for the 2008 model year Ford Super Duty trucks are redesigned, will have twin sequential turbos — a smaller one feeding the bigger one. The benefits of this are faster spool-up times, smoother power delivery, and better fuel economy and emissions. The 6.4 L will probably be based on the 6.0 L block. It will also use a new piezo-electric common rail direct injection system^[1].

The engine is said to produce 350 hp (260 kW) and 650 ft·lbf (880 N·m). ^[2]

This engine will also be used in International trucks and buses under the name MaxxForce 7. However, the MaxxForce 7 will not have the sequential turbocharger system; rather, it will use the variable turbocharger from the VT365. Displacement and injector systems are the same. In MaxxForce 7 guise, the engine will produce between 200-230 hp and 580-620 lb-ft of torque. [2]