| AMC Straight-6 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | American Motors Corporation |
| Production | 1964–2006 |
| Layout | |
| Configuration | Naturally aspirated Straight-6 |
| Displacement | 199 cu in (3.3 L) 232 cu in (3.8 L) 242 cu in (4.0 L) 252 cu in (4.1 L) 258 cu in (4.2 L) 282 cu in (4.6 L) |
| Cylinder bore | 3+3⁄4 in (95.3 mm) 3.875 in (98.4 mm) 3.91 in (99.3 mm) 3.917 in (99.5 mm) |
| Piston stroke | 3 in (76.2 mm) 3.414 in (86.7 mm) 3.4375 in (87.31 mm) 3+1⁄2 in (88.9 mm) 3.895 in (98.9 mm) |
| Cylinder block material | Cast-iron |
| Cylinder head material | Cast-iron |
| Valvetrain | OHV 2 valves x cyl. |
| Compression ratio | 7.7:1, 8.0:1, 8.5:1, 9.5:1 |
| Combustion | |
| Fuel system | Carburetor Multi-port fuel injection |
| Management | AMC CEC Renix or Mopar (manufactured by Siemens) |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 129–200 hp (96–149 kW; 131–203 PS) |
| Torque output | 216–280 lb⋅ft (293–380 N⋅m) |
| Dimensions | |
| Dry weight | 483 lb (219 kg) (4.0 L engine) |
The AMC straight-6 engine is a family of straight-six engines that were produced by American Motors Corporation (AMC), and used in AMC passenger cars and Jeep vehicles from 1964 through 2006. Production continued after Chrysler acquired AMC in 1987.
AMC's first inline-six engine was a legacy model initially designed by Nash Motors; it was discontinued in 1965. This completely new design was introduced by AMC in 1964. The engine evolved in several displacements and underwent upgrades. This family of six-cylinder engines was also manufactured by Vehículos Automotores Mexicanos and included a version available only in Mexico.
A new 4.0 L engine was introduced by AMC in 1986 and became the final version of AMC inline sixes. It is regarded as one of the best 4x4 and off-road engines. This engine was produced by Chrysler through 2006.