The double overhead cam Ford Duratec 2.5-litre SFI (sequential fuel injection) engine made the Ward's 10 best engines list for 1995 and 1996; Ward's chose a high performance version for its 1998 list. The engine has been used in such vehicles as the Ford Contour and Mondeo, the Jaguar "X" and "S" types and the Mazda MPV.
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The six-cylinder (V6) engine has a 60-degree bank angle and a displacement of 2544 cubic centimetres. The bore and stroke measure 82.4mm and 79.5mm, respectively. The engine uses an aluminium double overhead cam cylinder head and a cast iron block. It delivers 171 horsepower at 6,000rpm and 171 foot-pounds of torque at 4,500rpm through the use of sequential fuel injection technology. SFI systems have one injector for each cylinder, squirting fuel into the combustion chamber when the intake valve opens. Other types of fuel injection systems, by contrast, have an injector upstream from all of the cylinders, or groups of cylinders, supplying fuel for more than one at the same time. SFI injection is said to be more efficient, since it can be tuned separately for each combustion chamber.
The SVT version of the Duratec 2.5 L engine uses a larger throttle body, an intake manifold with extrude honing, a high-performance cone-shaped air filter, a special lightweight flywheel and low-restriction exhaust system to produce up to 200 horsepower and 169 foot-pounds of torque.
Variations on the 2.5
Jaguar installs its version of the Duratec 2.5 L engine in the S-Type 2.5 in the United Kingdom and the X-Type 2.5 in the United States. Jaguar uses an aluminium block in their engine and variable valve timing. The Jaguar version displaces 2495 cubic centimetres, and up to 192 horsepower and 178 foot-pounds of torque with a 10.3 to 1 compression ratio. Mazda made only one minor change it its version; it reduced the displacement slightly to 2490 cubic centimetres to avoid a tax levied by the Japanese government on engines over 2500 cubic centimetres.
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