The Fiat 1.4 Liter FIRE Engine and MultiAir System
Chrysler has built its version of the Fiat "FIRE" (Fully Integrated Roboticized Engine) in Dundee, Michigan, starting in 2010, for use in the Fiat 500 and (turbocharged) Dodge Dart. Chrysler engineers modified it to meet American needs, including switching to a North American oil formulation (less than three quarts are needed) and regular grade unleaded fuel (except for the turbocharged version).
The engine produces 100 hp at 6,750 rpm and 95 lb-ft of torque at 4,250 rpm; a turbocharged version goes to 170 horsepower (170 hp @ 6,750 rpm and 170 lb-ft of torque at 3,000 rpm) on Fiat 500, and 160 horsepower (with 185 lb-ft) on the Dodge Dart. The engine includes MultiAir, a variable valve timing and lift technology which allows for separate timing of each cylinder. The system uses electro-hydraulic valve actuators; a solenoid energized with each rotation of the camshaft regulates the amount of oil sent to the actuator, which controls the amount of lift from completely closed to completely open. The valves can also vary the timing.
The 1.4 liter FIRE engine is the first to use MultiAir, which is planned for both the Chrysler World Engine and Pentastar V6 (though not the Hemi, whose variable cam timing will continue.) The MultiAir system has been developed so that its components are kept in "bricks" (one for each cylinder) to make adaptation easier. MultiAir technology can be adapted to diesels for enhanced NOx control; it will reportedly be installed on the Chrysler “World Engines” and Pentastar V6, though the Hemi V8 will retain its current variable cam timing.
Chrysler had engineered a 1.4 liter engine (some sources say it was based on the Neon 2.0), for use in small cars including the Rover Mini. A 1.6 liter version of this engine powered the BMW Mini in its first generation; it produced 115 hp (86 kW) at 5,600 rpm and 113 lb-ft (153 Nm) at 4,400 rpm, and had low emissions in accordance with strict European standards. The Rover-Chrysler engine had a single overhead cam, aluminum heads, and four valves per cylinder, and was designed for use in a 2001-model-year Chrysler minicar. This engine has been out of production since the BMW switched to a more recently developed French engine.
The FIRE name stands for Fully Integrated Robitized Engine and is a throwback to the early 1970s, when Fiat integrated the robotics into the production process; mechanized assembly is commonplace today, but the brand name FIRE has remained with Fiat.