| AMC Straight-4 engine | |
|---|---|
 2.5 L AMC straight-4 with MPFI | |
| Overview | |
| Manufacturer |
|
| Also called | PowerTech |
| Production | 1984–2002 |
| Layout | |
| Configuration | Straight-4 |
| Displacement | 150.4 cu in (2.5 L) |
| Cylinder bore | 3.875 in (98.4 mm) |
| Piston stroke | 3.1875 in (80.96 mm) |
| Cylinder block material | Cast iron |
| Cylinder head material | Cast iron |
| Valvetrain | OHV 2 valves per cylinder |
| Compression ratio | 9.1–9.2:1 |
| Combustion | |
| Fuel system | |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Output | |
| Power output | 105–130 hp (106–132 PS; 78–97 kW) |
| Torque output | 132–150 lb⋅ft (179–203 N⋅m) |
| Chronology | |
| Predecessor | |
| Successor | Chrysler 1.8, 2.0 & 2.4 engine |
The AMC straight-4 engine is a 2.5 L inline-four engine developed by American Motors Corporation (AMC) that was used in a variety of AMC, Jeep, and Dodge vehicles from 1984 through 2002.
The 2.5 L I4 Jeep engine shared design elements and some internal components with the AMC 4.0 L I6 that was introduced for the 1987 model year. The 2.5 L engine was designed specifically for the vehicles it went into and became known for its reliability and longevity.
The GM Iron Duke was a predecessor I4 engine in some AMC vehicles, but it shares nothing in common with the AMC 2.5 L. The Chrysler 2.5 L I4 shares nothing, and this successor engine family was designed to improve emissions and fuel economy.