The Quad 4 engine was first released to the public as a regular production option for the 1988 Oldsmobile Cutlass Calais and Pontiac Grand Am, producing 150 bhp (112 kW) and 160 bhp (119 kW) in its initial variants. The high-output "HO" Quad 4 produced 180 hp (134 kW) from 1989 to 1992. A total of 200 Cutlass Calais International Series coupes and 200 Grand Am SE coupes featured the engine.
The Quad 4 is the first domestic regular production DOHC four-cylinder engine wholly designed and built by GM. All Quad 4 family engines were produced at the Lansing Engine Plant in Delta Township near Lansing, Michigan.
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).
The Quad 4 engine lineup included various versions such as the LD2, LG0, W41, L40, and LD9. The LD2 is the original version of the Quad 4, introduced in 1987 for the 1988 model year, producing 150 bhp (112 kW) from 1988 to 1989 and 160 bhp (119 kW) from 1990 to 1992. The LG0 was rated at 180 hp (134 kW) from 1989 to 1992.
The W41 was the most powerful Quad 4, with 1991–1992 W41s rated at 190 hp (142 kW) and 160 lb-ft of torque.
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 Quad 4 was used in various applications, including the 1988–1991 Buick Skylark, 1992–1994 Oldsmobile Achieva, 1988–1991 Oldsmobile Cutlass Calais, and 1990–1991 Oldsmobile Cutlass Supreme.
The Quad 4 was featured in the Oldsmobile Aerotech, showcasing its design capability. At the 1988 Indianapolis 500, the pace car was an Oldsmobile Cutlass Supreme convertible powered by a turbocharged production Quad 4.
Versions of the Quad 4 include the LD2, LG0, W41, L40, and LD9. The LD9 Twin Cam was a 2.4-liter Quad 4 variant which debuted in 1996 with balance shafts and a redesigned cylinder head.
Oldsmobile engineering's Chief Engineer Ted Louckes and Future Systems and Technology engineer Bill Porterfield had begun a program looking for more power and higher efficiency from the engine. Two new twin-cam four-cylinder engines were built, based on a set of engineering parameters derived from the engine, which Oldsmobile referred to as the "production architecture."
The Batten RE engine was designed by Rudy Sayn and Andy Schwartz of Batten Heads in Detroit. Output estimates for the Batten RE engine range from 750 to 900 hp.
The Feuling BE engine is estimated to have been approximately 1,000 hp. It was used in the long-tail Aerotech car.
A photo of an Oldsmobile V8 engine developed using Quad 4 technology, called the Quad 8, was shown in an episode of MotorWeek from early 1988. The engine made an appearance at a Specialty Equipment Market Association show in Las Vegas, but did not go into production.
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