Duratec Engine Overview

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6 Cylinder

All three V6 Duratecs are evolutions of the same design. It is a modern aluminum DOHC V6 with a 60° bank angle. The primary engineering input came from Porsche, who were developing a similar V6 before selling the engineering to Ford, and Cosworth, who helped with cylinder head manufacturing.

The Jaguar AJ-V6 engine is similar but adds variable valve timing. Mazda's AJ version also has this feature.

Duratec 25

The Duratec 25 is a 2.5 L (2544cc) 60° V6 and was introduced in 1994. It was developed for the Ford Mondeo and used in the Ford Contour, Jaguar X-Type, and others. Bore is 82.4 mm and stroke is 79.5 mm.

The Duratec 25 was on the Ward's 10 Best Engines list for 1995 and 1996, and the SVT version made the list for 1998.

Duratec 25 SVT

An SVT version produced 195 hp (145 kW) and 165 ft.lbf (224 Nm). It included a larger throttle body from the Duratec 30, a new cone-shaped air filter, and extrude honing on the intake manifold. A lighter flywheel and low-restriction exhaust complete the picture. The SVT engine was used in the 1998 Ford Contour SVT.

Duratec VE

The 2.5 L, 170 hp V6 used in Ford Mondeo is called Duratec VE. At the date of apparition, it was the lightest mass produced 6 cylinder in the world, weighing in at only 175kg. Aluminium block, cylinder heads and intake manifold helped to achieve such low weight. It has 2 stage variable intake, long intake for below ~3200rpm and short intake for above.

Mazda AJ

Mazda used the Duratec 25 block and camshaft in their 2000 MPV. However, they reduced the size from 2.54 L to 2.49 L to keep under a 2.5 L tax cap in Japan. This was accomplished with a slightly-shorter stroke. The engine produced 170 hp at 6250 RPM and 165 ft.lbf (224 Nm) of torque. It was replaced in 2002 with the larger 3.0 L Duratec 30-based Mazda AJ.

Duratec 30

Ford's standard DOHC V6 is known as the Duratec 30 or Mazda AJ. It has 3.0 L (2967 cc) of displacement and produces between 200 and 240 horsepower (150 and 180 kW). The same engine is used by the Jaguar S-Type, Lincoln LS, Mazda MPV, Mazda6, Mercury Mystique, and many other Ford vehicles. It is essentially a bored-out (to 88.9 mm) Duratec 25 and is built in Ford's Cleveland, OH #2 plant. A slightly modified version for the Ford Five Hundred entered production at the Cleveland, OH #1 plant in 2004.

It has an aluminum engine block and aluminum DOHC cylinder heads. The cylinders are lined with cast iron. It uses SFI fuel injection, has 4 valves per cylinder and features fracture-split forged powder metal connecting rods and an assembled cast aluminum intake manifold.

The Lincoln LS version has bucket tappets and produces 232 hp (173 kW) at 6750 RPM with 220 ft.lbf (298 Nm) of torque at 4500 RPM.

The Taurus/Sable/Escape version uses roller followers instead and produces 201 hp (150 kW) at 5900 RPM with 207 ft.lbf (281 Nm) of torque at 4400 RPM.

Applications

208 hp

1994-2005 Ford Taurus/Mercury Sable

2001-2005 Ford Escape/Mazda Tribute

232 hp

2000-2005 Lincoln LS

Jaguar AJ30

Jaguar S-type

2005 Ford Five Hundred, Mercury Montego and Ford Freestyle

Mazda AJ

Mazda's AJ version adds variable valve timing, as does Jaguar's AJ30. It displaces 2886 cc with an 89 mm bore and 79.5 mm stroke. Output (on the MPV) is 200 hp at 6200 RPM with 200 ft.lbf (271 Nm) of torque at 3000 RPM

Mazda AJ

2002-2004 Mazda MPV, 200 hp 2005 Mazda 6

Duratec

Duratec ST

The 3.0 L, 226 hp V6 used in the Mondeo ST220 is called Duratec ST.

Duratec SE

The 3.0 L, 204 hp V6 in the Mondeo Titanium is called Duratec SE.

Duratec 35

The Duratec 35 (code-name Cyclone) is a new 3.5 liter V6 that will appear in 2005. It is an all-aluminum engine based on the Duratec 30, and adds variable valve timing, a feature already found on the Jaguar AJ30 and Mazda AJ versions of the 3.0. Its displacement can be increased to 3.8 liters, meaning a Duratec 38 could come soon after.

The aluminum block is made by Teksid in Alabama, while the heads come from Newmak in Mexico, and the crankshaft comes from Bharat Forge of India. The engine will be assembled in Lima, Ohio.

8 Cylinder

The Ford Yamaha V8 engine is a version of the 2.5 L V6 was produced with two additional cylinders (3.4 L V8) but was not called a Duratec officially.

12 Cylinder

The 6.0 L V12 used in Aston Martin cars is sometimes erroneously referred to as "essentially two 3.0 L V6 units bolted together". In reality, the engine is custom-built for Aston Martin by Cosworth Technology (both Aston Martin and Cosworth are owned by Ford) and while it uses some standard Duratec components, it is Cosworth's own design. Aston Martin use this engine in the DB7 Vantage, the V12 Vanquish and the DB9.

These engines will generally work with the CD4E, MTX-75 and Durashift gearboxes.

Submitted by duffgun