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This page chronicles the many automobile engines that General Motors has used in its various marques.GM currently uses certain terminology to refer to groups of engines, but this terminology does not necessarily isolate families. In other words, not all of the Vortec engines share common ancestry.
GM also uses three-character RPO codes to refer to specific engine models. Many of these have been reused over the years, and new RPO codes are sometimes used for very similar engines, however.
Unlike Chrysler and Ford, each GM division had its own line of engines until the 1970s. For this reason, making sense of GM engines can be difficult. For example, Buick, Chevrolet, Oldsmobile, and Pontiac each had a different 350 in³ V8 design!
- 1970s 2300 - SOHC I4
- 1970s 2500The 2500 (or Pontiac 2. 5 was a 2. 5 L (151 in³) I4 piston engine used in the 1970s by General Motors. It was used in the 1977 Pontiac Astre and 1978-1980 Pontiac Sunbird. It used an iron block and head, pushrods, and had a 4 in (101. 6 mm) bore and 3 in - pushrodA pushrod or overhead valve (OHV) type piston engine places the camshaft below the pistons and uses pushrods or "rods" to actuate lifters or tappets above the cylinder head to actuate the valves. This contrasts with an overhead cam (OHC) design which plac I4 Tech IV
- 1980s 2.2The pushrod 2. 2 straight-4 engine powered many compact cars from General Motors. It was eventually replaced by the Ecotec in the late 1990s. 2 was revised in 1992 with multiport fuel injection, a new intake manifold, and larger valves pushed by a revised - 2.2 L OHVIn automotive engineering, an Overhead Valve or OHV piston engine is one with pushrod-actuated poppet valves perpendicular to the pistons. This contrasts with previous designs, including side valves and sleeve valves. Today, the technology is widespread, I4
- 1988-1995 Quad-4The Quad 4 (called Twin Cam after 1995) was a DOHC straight-4 automobile engine produced by General Motors' Oldsmobile division in the 1990s. It was a modern engine for the time, but was criticized for roughness, and balance shafts were added in 1995, but - 2.3 L DOHC I4
- 1990-2000 Saturn - 1.9 L SOHC/ DOHC
- 2000s Ecotec - A modern DOHC I4 engine for compact cars
- Vortec - longitudinal I4 for trucks
- Atlas - longitudinal I4 for trucks
- 2000s Non-GM engines:
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