The Navistar VT engine family is a line of diesel engines that was produced by International Truck and Engine (

Navistar International Navistar, Inc is an American holding company created in 1986 as the successor to International Harvester. Navistar operates as the owner of International-branded trucks and diesel engines. The company also produces buses under the IC Bus b ...

) from 2003 to 2016. Developed as the replacement for the T444E V8, the VT V6 and V8 diesels were the smallest diesel engines used in Navistar vehicles, slotted below the DT inline-6 engine family. Sharing many applications with the DT466 inline-6, the VT engines were used in medium-duty trucks and school bus chassis, competing against the Cummins B-series and the Mercedes-Benz MBE900 diesel engines. In 2007, both the VT and DT engines were rebranded under the ''MaxxForce'' brand name, with model designations related to their displacement. From 2003 to 2010, VT engines were used by Ford Motor Company in several vehicles, sold as the second and third generations of the Ford Power Stroke diesel engine family. Fords E series continued to use the VT365 until the end of 2012. For 2011 production, the Power Stroke diesel shifted to a Ford-produced design. After 2016, Navistar ended production of both VT and DT-derived MaxxForce diesel engines, making the VT the final V-configuration engine produced by International. In medium-duty vehicles, the Cummins ISB6.7 diesel served as its replacement.

Variants

VT365

The VT365 is used in many International schoolbuses and is also known as the 6.0 L PowerStroke in 2003-2007

model year The model year (sometimes abbreviated "MY") is a method of describing the version of a product which has been produced over multiple years. The model year may or may not be the same as the calendar year in which the product was manufactured. ...

Ford Super Duty trucks and 2003-2010 model year Ford E-Series vans/chassis cabs, is a 32-valve

pushrod A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) ...

V8. Bore and stroke is . Output was at 3300 rpm and at 2000 rpm, but as of 2005 that was increased to at 2000 rpm. It also uses a 2nd generation (G-2) HEUI (Hydraulic-Electronic Unit injector) direct injection fuel system, as well as a

variable-geometry turbocharger Variable-geometry turbochargers (VGTs), occasionally known as variable-nozzle turbines (VNTs), are a type of turbochargers, usually designed to allow the effective aspect ratio of the turbocharger to be altered as conditions change. This is done ...

, which is designed to reduce

turbo lag In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

and create better throttle response. An optional ''TorqShift'' 5-speed

automatic transmission An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving ...

is available for Ford trucks. This special transmission gives improved performance to the engine, featuring a tow/haul mode (for example).

VT275

A variant of the VT365 is the VT275 4.5 L V-6, which is basically a 6.0 L V-8 less two cylinders. However, it uses a sequential twin-turbocharger system, instead of the single variable-geometry turbocharger used in the VT365. It is used in the 2006

Ford LCF The Ford LCF (Low Cab Forward) is a medium-duty cab-over truck that was marketed by Ford Motor Company from 2006 to 2009. The first cab-over (COE) vehicle sold by Ford since the company sold the rights to the Ford Cargo design (in North America ...

(Low Cab Forward) and International CF (Cab Forward) (later CityStar) series trucks. It produces and of torque and is backed by a Ford TorqShift 5 speed automatic. For the 2007 model year, the VT275 was brought up to 2007 EPA

emission standard Emission standards are the legal requirements governing air pollutants released into the atmosphere. Emission standards set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over ...

s and renamed the MaxxForce 5. It has since been discontinued for the 2010 model year.

MaxxForce 7

The MaxxForce 7, the International/Navistar engine which is a 6.4L V8 engine or also known as the 6.4 L PowerStroke in 2008-2010 model year Ford Super Duty trucks, is a V8

turbo-diesel The term turbo-diesel, also written as turbodiesel and turbo diesel, refers to any diesel engine equipped with a turbocharger. As with other engine types, turbocharging a diesel engine can significantly increase its efficiency and power output, ...

engine. The engine has a Series Sequential Turbocharger. They are not twin turbos, there is a high pressure and low pressure turbo, with only the high pressure turbo being a VGT (variable geometry turbo). The engine also uses a high pressure common rail fuel injection system. It produces at 3000 rpm and of torque at 2000 rpm in Ford truck applications. This engine is also used in International trucks and buses. However, the EPA2007 MaxxForce 7 has not the compound turbocharger system; rather, it uses a single stage variable vane turbocharger. Displacement and injector systems are the same as the Ford branded Power Stroke. In MaxxForce 7 guise, the engine produces between and of torque. For the 2010 model year, Navistar has upgraded the MaxxForce 7 with

dual compound In geometry, a polyhedral compound is a figure that is composed of several polyhedra sharing a common centre. They are the three-dimensional analogs of polygonal compounds such as the hexagram. The outer vertices of a compound can be connected ...

turbochargers, giving it a new power range at at 2600 rpm and of torque at 1600–2200 rpm. The cylinder block has also been updated using compacted graphite iron (CGI) material to increase strength and reduce weight.

Applications

Ford E-Series The Ford E-Series (also known as the Ford Econoline or Ford Club Wagon) is a range of full-size vans manufactured and marketed by the Ford Motor Company. Introduced for model year 1961 as the replacement for the Ford F-Series panel van, the E-S ...

(2003-2010) * Ford Excursion (2003-2005) *

Ford Super Duty The Ford Super Duty (short for F-Series Super Duty) is a series of heavy-duty pickup trucks produced by the Ford Motor Company since the 1999 model year. Slotted above the consumer-oriented Ford F-150, the Super Duty trucks are an expansion of ...

(2003-2010) * International 3000 (rear-engine bus) * International Citystar/Ford LCF * International Durastar/4200 **

International 3300 The International 3300 is a Type-C cowled bus chassis (conventional-style) manufactured by Navistar International, derived from the International DuraStar since 2004 for the United States, Canada, and Mexico. While most examples are produced as ...

(cowled bus) * International MXT * International MXT-MV * International Terrastar

References

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