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The Iron Duke engine (also called 151, 2500, Pontiac 2.5, and Tech IV) is a 151 cu in (2.5 L) straight-4 piston engine built by the Pontiac Motor Division of General Motors from 1977 until 1993. Originally developed as Pontiac's new economy car engine, it was used in a wide variety of vehicles across GM's lineup in the 1980s as well as supplied ...
GM Iron Duke RWD inline 4 (early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations) Jeep with GM Iron Duke inline 4 2.5L/151 in 3 (1980-1983). These use a Chrysler custom Torqueflite 904 automatic transmission with an integral Chevrolet bellhousing.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm). It shared most of the 389's ...
The standard fuel-injected 90 hp 2.5L 4-cylinder Pontiac "Iron Duke": This marked the first time a 4-cylinder engine was offered in the Firebird and was the last true Pontiac engine to be offered in the Firebird. This engine was only offered for the first few years of the generation.
The Fiero was redesigned to use a fuel efficient version of GM's 2.5 L (151 cu in) four-cylinder Iron Duke engine capable of 31 mpg ‑US (7.6 L/100 km; 37 mpg ‑imp) in the city and 50 mpg ‑US (4.7 L/100 km; 60 mpg ‑imp) on the highway with the economy-ratio transmission option. [4]
The Vortec 2200 (RPO code L43) is an OHV straight-4 truck engine. This engine is equipped with secondary air injection, and is flex-fuel capable. It is entirely different from the Iron Duke, and was the last North American iteration of the GM 122 engine. The 2200 uses an iron block and aluminum two-valve cylinder head.
1977 Pontiac Phoenix 4-door Sedan. Second generation (1980–1984) Second generation; 1980 Phoenix hatchback ... Available engines were a 2.5 L Iron Duke 4-cylinder, ...
Pontiac also introduced its 151 cu in (2.5 L) "Iron Duke" 4-cylinder overhead valve engine. It was first used in the 1977 Astre, replacing Astre's aluminum-block 140 cu in (2.3 L) Vega engine. The 'Iron Duke' engine would later go into many GM and non-GM automobiles into the early 1990s.