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Quad 4 engine
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Quad 4 engine
The Quad 4 is a family of straight-four engines produced by General Motors' Oldsmobile division. Several double overhead camshaft (DOHC) versions were produced between 1987 and 2002, and one single overhead camshaft (SOHC) model was built from 1992 to 1994.
The Quad 4 is the first domestic regular production DOHC four-cylinder engine wholly designed and built by GM, the only similar prior example being the Chevrolet Cosworth Vega, whose DOHC head was designed by Cosworth in England. In addition to the 2.3-liter DOHC Quad 4s, there was also a short-lived 2.3-liter SOHC variant called the "Quad OHC", available from 1992 to 1994, and the 2.4-liter Twin Cam, available from 1996 to 2002.
The Quad 4 was originally expected to debut in 1987, but was delayed for one year. From as early as 1988, Oldsmobile announced that a high-output "HO" Quad 4 with 180 bhp (134 kW) was forthcoming.
All Quad 4 family engines were produced at the Lansing Engine Plant (plant five) in Delta Township near Lansing, Michigan. The Twin Cam was the last engine that was engineered and produced solely by Oldsmobile; the Aurora V8 and Shortstar V6 were based on the Cadillac Northstar V8 architecture.
First released to the public as a regular production option for the 1988 Oldsmobile Cutlass Calais and Pontiac Grand Am, the engine's availability expanded to Buick in late 1988 and Chevrolet in 1990, after which it became a mainstay in GM's lineup.
The Quad 4 underwent two rounds of exhaust port size reductions, followed by the addition of balance shafts in 1995 to address its levels of noise, vibration, and harshness (NVH). Further changes were made for the 1996 model year when the engine's bore and stroke were changed, and the engine was subsequently renamed the "Twin Cam".
The Quad 4 engine lineup was cancelled after the 2002 model year. It was replaced by the Ecotec for the 2003 model year.
The Quad 4 name is derived from the engine's four-cylinder, four valve-per-cylinder layout. The engine has a cast iron block. The head, camshaft carriers, and timing chain cover are aluminum, and the sump is die-cast aluminum.
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Quad 4 engine
The Quad 4 is a family of straight-four engines produced by General Motors' Oldsmobile division. Several double overhead camshaft (DOHC) versions were produced between 1987 and 2002, and one single overhead camshaft (SOHC) model was built from 1992 to 1994.
The Quad 4 is the first domestic regular production DOHC four-cylinder engine wholly designed and built by GM, the only similar prior example being the Chevrolet Cosworth Vega, whose DOHC head was designed by Cosworth in England. In addition to the 2.3-liter DOHC Quad 4s, there was also a short-lived 2.3-liter SOHC variant called the "Quad OHC", available from 1992 to 1994, and the 2.4-liter Twin Cam, available from 1996 to 2002.
The Quad 4 was originally expected to debut in 1987, but was delayed for one year. From as early as 1988, Oldsmobile announced that a high-output "HO" Quad 4 with 180 bhp (134 kW) was forthcoming.
All Quad 4 family engines were produced at the Lansing Engine Plant (plant five) in Delta Township near Lansing, Michigan. The Twin Cam was the last engine that was engineered and produced solely by Oldsmobile; the Aurora V8 and Shortstar V6 were based on the Cadillac Northstar V8 architecture.
First released to the public as a regular production option for the 1988 Oldsmobile Cutlass Calais and Pontiac Grand Am, the engine's availability expanded to Buick in late 1988 and Chevrolet in 1990, after which it became a mainstay in GM's lineup.
The Quad 4 underwent two rounds of exhaust port size reductions, followed by the addition of balance shafts in 1995 to address its levels of noise, vibration, and harshness (NVH). Further changes were made for the 1996 model year when the engine's bore and stroke were changed, and the engine was subsequently renamed the "Twin Cam".
The Quad 4 engine lineup was cancelled after the 2002 model year. It was replaced by the Ecotec for the 2003 model year.
The Quad 4 name is derived from the engine's four-cylinder, four valve-per-cylinder layout. The engine has a cast iron block. The head, camshaft carriers, and timing chain cover are aluminum, and the sump is die-cast aluminum.
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