GM Iron Duke engine
| Iron Duke | |
|---|---|
| Overview | |
| Manufacturer | GM |
| Production | 1977-1993 |
| Combustion chamber | |
| Displacement | 150.8 cu in (2.5 L) |
| Cylinder bore | 4 in (101.6 mm) |
| Piston stroke | 3 in (76.2 mm) |
| Cylinder block alloy | Iron |
| Cylinder head alloy | Iron |
| Compression ratio | 8.2:1 (1977-1983) 9.0:1 (1984+) |
| Combustion | |
| Cooling system | Watercooled |
| Output | |
| Power output | 85-110 hp (63-82 kW) |
| Specific power | 0.56 hp/cu in (25.2 kW/L) |
| Torque output | 123-135 lb·ft (167-183 N·m) |
| Chronology | |
| Predecessor | GM 2300 engine |
| Successor | GM 122 engine |
| Tech 4 | |
|---|---|
 |
|
| Overview | |
| Manufacturer | GM |
| Also called | Iron Duke |
The Iron Duke Pontiac engine VIN code A (also called the 2500, 151, Pontiac 2.5, and Tech IV, though the decal on the air filter assemblies actually reads "4 Tech") is a 2.5 L (150.8 cu in) I4 piston engine. All Iron Dukes were built by Pontiac beginning in 1977 and ending in 1993. After this time, the GM 2.2 L OHV 4-cylinder replaced it across the entire lineup of vehicles that offered it. This engine is not to be confused with the Chevrolet 153. Early Iron Dukes had a Chevrolet V8 bellhousing (also shared with its third generation inline six) instead of the Buick-Oldsmobile-Pontiac bellhousing bolt pattern until the early 1980s when the later versions were installed in FWD applications where the 2.8L bellhousing bolt pattern was phased in. Cylinder head design had the intake manifold mounted on the passenger side, and the exhaust manifold on the driver side.
This 151 was also used by American Motors (AMC) starting in 1980, as the base engine option in the RWD Spirit and Concord, and continuing in both cars through 1982. The AWD (4x4) Eagle carried the 151 as standard equipment for 1981, and carried it midway through the 1983 model year. It was also available (as the Hurricane) in economy model Jeep CJs. AMC replaced the Iron Duke 2.5L I4 with a 150cid Inline-4 derived from their own six.
Applications:
The LS6 was a 151 cu in (2.5 L) I4 engine produced from 1978 to 1979.
The LS8 was a 151 cu in (2.5 L) I4 engine produced for 1979.
The LX6 was a 151 cu in (2.5 L) I4 engine produced from 1977 to 1978.
The LX8 was a 151 cu in (2.5 L) I4 engine produced from 1979 to 1980. This version introduced a cross-flow cylinder head.
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