General Motors 122 engine

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122 engine
Overview
Manufacturer General Motors
Production 1982-2003
Combustion chamber
Configuration Straight-4
Displacement
  • 1,840 cc (112 cu in)
  • 1,991 cc (121.5 cu in)
  • 2,189 cc (133.6 cu in)
Cylinder bore 89.0 mm (3.50 in)
Piston stroke
  • 74 mm (2.91 in)
  • 80.0 mm (3.150 in)
  • 88.0 mm (3.46 in)
Cylinder block alloy Cast Iron
Cylinder head alloy Aluminum
Valvetrain Overhead valve
Compression ratio 9.0:1
Combustion
Fuel system Carburetor
Throttle-body fuel injection
Multi-point fuel injection
Sequential multi-point fuel injection
Fuel type
Oil system Wet sump
Cooling system Water-cooled
Chronology
Predecessor GM Iron Duke engine
Successor

The 122 engine was designed by Chevrolet and was used in wide-array of General Motors vehicles. The 122 was similar to the first two generations of the General Motors 60° V6 engine; sharing cylinder bore diameters and some parts[citation needed]. The 122 was available in the US beginning in 1982 for the GM J platform compact cars and S-series trucks.

For the J cars it evolved through 2002 when it was replaced by GMs Ecotec line of DOHC 4-cylinder engines. In the S-10 related models it evolved through 2003 when it was known as the Vortec 2200. Production ceased consistent with the replacement of the S-series trucks with the GMT 355 sub-platform.

Generation I[edit]

1.8[edit]

L46[edit]

The 1.8 L pushrod engine was the first engine to power the J-Body cars. Introduced with the models in 1982, the 1.8 used a 2-barrel Rochester carburetor and produced 88 horsepower (66 kW) at higher rpm. Acceleration in these cars was quite sluggish, with a test 1982 Pontiac J2000 accelerating from 0–60 mph in 16.3 seconds, with a quarter mile (~400 m) time of 20.6 seconds.

Applications:

2.0[edit]

LQ2[edit]

This engine was similar to the LQ5 however it did not use throttle body fuel injection, instead it had a 2-barrel carburetor. This engine was used in the Chevrolet S-10 and GMC S-15 compact pickup trucks and their Blazer and Jimmy counterparts until 1985, when it was replaced by the 2.5 L Tech IV engine. This engine produced 83 hp (62 kW) @ 4600 RPM and 108 lb·ft (146 N·m) @ 2400 RPM.

Applications:

LQ5[edit]

A stroked version of the 1.8 L engine, displacing 2.0 L, was introduced midway through 1982, to provide more low-rpm power for the J cars. This engine replaced the 1.8 L engine altogether and had throttle body fuel injection. It produces 86 horsepower (64 kW).

Applications:

Generation II[edit]

2.0[edit]

LL8[edit]

This engine replaced the LQ5 and was used from 1987 until 1989. it feature throttle body fuel injection and produced 90 hp (67 kW) and 108 lb·ft (146 N·m) of torque.

Applications:

2.2[edit]

2.2 L OHV I4 engine
2200 OHV I4 engine

LM3[edit]

For the 1990 model year, GM replaced the 2.0 L engine with a stroked version displacing 2.2 L; with throttle body fuel injection (TBI). Commonly called the 2.2, it produced 95 horsepower (71 kW) and 120 lb·ft (163 N·m) of torque.

Applications:

LN2[edit]

For 1992, the 2.2 received multi-port fuel injection (MPFI) replacing the TBI version in the J-body cars increasing power to 110 horsepower (82 kW) and torque to 130 lb·ft (176 N·m). In the L-body cars it was converted straight to Sequential Fuel injection. In 1994, all 2.2 L engines were updated to sequential multi-port fuel injection and power increased to 120 horsepower (89 kW) with torque increasing to 140 lb·ft (190 N·m). The MPFI and SFI versions produced enough power to allow the 2.2 to replace the old Pontiac Iron Duke engine as the 4-cylinder offering in the S/T platform trucks and A-body cars. For 1996, it became known as the Vortec 2200 in the S/T trucks.

For 1998, the engine was revised for emissions regulations and became known as the 2200; this revision lowered power to 115 hp (86 kW) at 5000 rpm and torque to 135 lb·ft (183 N·m) at 3600 rpm. The engine was discontinued in 2003, replaced by the 2.2 L DOHC Ecotec engine. Although it displaces 134 cu. in, the 2.2 L OHV is still commonly referred to as the GM 122 today, and has been reputed for its simplicity, reliability and ease of maintenance in the J-body cars and S-Series trucks, and a few L-Body cars. The 2003 model LN2 is equipped with secondary air injection.[1]

Applications:

L43[edit]

The Vortec 2200 (RPO code L43) is an OHV straight-4 truck engine. This engine is equipped with secondary air injection, and is flex-fuel capable. It is entirely different from the Iron Duke having been the last North American iteration of the GM 122 engine. The 2200 uses an iron block and aluminum 2-valve pushrod cylinder head. Output is 120 hp (89 kW) at 5000 rpm and 140 lb·ft (190 N·m) at 3600 rpm. Displacement is 2,189 cc (2.189 L; 133.6 cu in) with an 89 mm (3.5 in) bore and 88.00 mm (3.465 in) stroke. 2200s were built in Tonawanda, New York. This engine was replaced by the LN2 in September of 2002.[2]

Applications:

See also[edit]

References[edit]

  1. ^ http://archives.media.gm.com/division/2003_prodinfo/03_powertrain/03_truck_engine/index.html. Retrieved 16 April 2014.  Missing or empty |title= (help)
  2. ^ http://archives.media.gm.com/division/powertrain/products/engine/truckengines/2003/truck_benefits/ln2.doc. Retrieved 16 April 2014.  Missing or empty |title= (help)