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Used also in other vehicles of the 1990s, not only all-terrain vehicles such as the Range Rover and the Toyota Land Cruiser, but also sedans and minivans: Ford Scorpio, Chrysler Grand Voyager, Alfa Romero 155. Prone to overheating and suffering severe head damage, it gained the reputation of a capable and durable, + 500 tKm, but very unreliable engine, (if driven HOT, and stopped, not allowed to cool a bit down). VM 425 OVH (also HR492), was the smoothest, most petrol-like units available at time,and had the highest power pr liter ratio available. Instead of a single head covering all four cylinders, it featured an independent head for each piston (4 heads), a concept borrowed from VM Motori's ample experience building marine engines. Inline four turbodiesel engine provided by Italian manufacturer VM Motori, owned by Detroit Diesel Corporation, 2499 cc, OVH (gear driven), push rod, 2 valves per cylinder, indirect injection. The final production year used sequential mulitple-port fuel injection.įor comparison, the 4.2L I-6 produced 112 HP 3,200 rpm and 210 ft lbs of torque 2,000 rpm in its final year with the computer controlled carburetor.įor several years, the engine was detuned for the Wrangler from at least 1992 to 1995, it produced 130 horsepower and 149 ft lbs of torque with 9.2:1 compression in the Cherokee and Comanche. The AMC I-4 appeared in 1984 with the new XJ Cherokee and was produced through 2002 for the Jeep Wrangler and Dodge Dakota pickup, which used the AMC/Jeep designed four since 1996. The four-cylinder and V6 shared the same drivetrain components, whereas stronger transmissions were needed for the 4.0L I-6. Instead of the standard AMC bell housing bolt pattern, AMC/Jeep engineers adopted the General Motors small V6 and four cylinder bolt pattern (commonly used with GM's transverse-mounted powerplants) for their new engine, because the 2.5 replaced four-cylinder engines which had been purchased from GM and because AMC continued to buy the 2.8L V6 from GM until the 4.0L I-6 was introduced in 1987.
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The head featured a new combustion chamber and port design which was later used on the 4.0L I-6 - the 2.5L I-4 head is stretched by two cylinders in the center.
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The block is basically the same as the 4.2L I-6 with a larger bore and the two center cylinders removed. The 2.5L inline-4 is a shortened version of the 4.2L 258 I-6 engine bored to 3.88 in (99 mm) and de-stroked to 3.19 in (81 mm). The AMC (American Motors Corporation) straight-4 engine is used by a number of AMC, Jeep and Dodge vehicles from 1984 through 2002. Radiator is cooled by a thermostat controlled electric fan. In its rear-wheel drive configuration, this engine was used only in "SE" Wranglers from 2003 through 2006. It is due to be slowly replaced by the 2.4 liter World Engine." In 2002, it was titled "PowerTech" in the Jeep Cherokee. "The 2.4 entered production in December 1994 for minivans and cloud cars with the four speed automatic transmission.