GM 122 engine

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General Motors produced an overhead valve straight-4 engine for the J-body compact cars and S-series trucks. Displacement ranged from 1.8 L to 2.2 L with turbocharged 1.8 and 2.0 L versions offered as well. The final version was known as the 2200, and lived on as the Vortec 2200, though the earlier models were never even named. The line was eventually replaced by the Quad-4 and Ecotec Family II in the late 1990s.

1.8L OHV

The 1.8L was the first version, introduced in 1982. It utilized a pushrod design and a two barrel Rochester E2SE carburetor and made 88 horsepower (66 kW). This engine was only used in 1982. For later years it was enlarged to 2.0 liters by increasing the stroke. This improved low speed acceleration, which was sluggish in the 1982 J body cars with the 1.8L engine.


In 1983, a SOHC engine was also available with throttle body injection and 84 horsepower (63 kW). The SOHC was not used in the Chevrolet Cavalier. 1.8 A turbocharged variant was added in 1984, using multi-port fuel injection. Making 150 horsepower (110 kW), it had more power than many V6s of the time. The 1.8L SOHC engine was discontinued after 1986.

2.0L OHV

A 2.0L version was introduced as an option in 1982 for the Pontiac J2000 and Chevrolet Cavalier. Also using a two barrel carburetor, it made 88 horsepower (66 kW). A throttle body injected version replaced the carbureted version for 1983, making 2 less horsepower than the previous version, but in turn produced better fuel mileage and emission control, and was now exclusively offered in the Cavalier. By the time it was discontinued after 1989, it produced 90 horsepower (67 kW).


The 2.0L SOHC replaced the 1.8L engine for 1987, retaining its throttle body injection. Horsepower was up to 96 (from 84 with the 1.8), and the engine was still used in all J body models save the Cavalier (which used the 2.0L OHV version) and the Cadillac Cimarron (which featured a standard V6 engine). A turbo version with multi-port fuel injection producing 165 hp (up from 150 with the 1.8) and 175 ft·lbf (237 N·m) of torque was available in the Pontiac Grand Am from 1987 to 1989 and Pontiac Sunbird from 1987 to 1990. The throttle-body injected version was replaced by multi-port injection for 1992, with horsepower up to 110. The 2.0L was discontinued for 1995, replaced by Chevy's 2200.


The 2.2 L version was revised in 1992 as the 2200 with multiport fuel injection, a new intake manifold, and larger valves pushed by a revised camshaft. This version increased power to 110 hp (82 kW) with 130 lb·ft (176 N·m) of torque, and allowed the idle rate to drop to just 600 rpm. Incremental improvements in engine power were made until the end of its life, with output reaching 115 hp (86 kW) when it was last used in 2002. This engine has a displacement of 2189 cc or 134 cu in.

See also