Quad 4 engine

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Oldsmobile Quad 4
Overview
Manufacturer	Oldsmobile division of GM
Also called	Twin Cam or Quad OHC
Production	1987-2002
Layout
Configuration	Straight-4
Displacement	2.3 L; 137.9 cu in (2,260 cc) 2.4 L; 146.0 cu in (2,392 cc)
Cylinder bore	92 mm (3.62 in) 90 mm (3.54 in)
Piston stroke	85 mm (3.35 in) 94 mm (3.7 in)
Cylinder block material	Cast iron
Cylinder head material	Aluminum
Valvetrain	DOHC 4 valves per cylinder SOHC
Compression ratio	9.5:1, 9.7:1, 10.0:1
Combustion
Turbocharger	On some versions
Fuel system	Sequential MPFI
Fuel type	Gasoline
Oil system	Wet sump
Cooling system	Water-cooled
Output
Power output	150–190 bhp (112–142 kW)
Torque output	160 lb⋅ft (217 N⋅m)
Chronology
Successor	Ecotec engine

Quad 4 is the name of a family of principally DOHC inline four-cylinder engines produced by General Motors' Oldsmobile division between 1987 and 2002; a single SOHC version was built between 1992 and 1994.

Its name was derived from the engine's four-valve, four-cylinder layout. Introduced with a displacement of 2,260 cc (2.3 L; 137.9 cu in), the engine was a modern design for its time, using a cast-iron block and an aluminum head. Even though belts were more popular for this purpose on OHC engines at the time, chains were used to time the camshafts to the crankshaft. The water pump is also driven by the timing chain.

The Quad 4 was the first wholly domestic regular production DOHC four-cylinder engine designed and built by GM; the only prior DOHC four-cylinder engine offered by GM was the Cosworth Vega, which featured a DOHC head designed by Cosworth in England. In addition to the 2,260 cc (2.3 L; 137.9 cu in) DOHC versions, there was also both a short-lived SOHC variant, the "Quad OHC", available from 1992 to 1994, and the 2,392 cc (2.4 L; 146.0 cu in) Twin Cam from 1996 to 2002.

All engines in the Quad 4 family 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 shared architecture with the Cadillac Northstar V8.

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 until its cancellation after the 2002 model year. It was replaced by the Ecotec for the 2003 model year.