General Motors 122 engine

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General Motors 122 engine
GM Atlas engine (Trucks)

The 122 engine was designed by

trucks.

For the

GMT 355

sub-platform.

Generation I

1.8

L46

The 1.8-liter pushrod engine was the first engine to power the J-body cars. Introduced with the models in 1982, the 1.8 used a two-barrel Rochester carburetor and produced 88 hp (66 kW) and 100 lb⋅ft (140 N⋅m) of torque. Since peak output came on at higher RPM, acceleration in these cars was quite sluggish, with a test 1982 Pontiac J2000 accelerating from 0–60 mph (0–97 km/h) in 16.3 seconds, with a 1⁄4 mile (402 m) time of 20.6 seconds.

Applications:

• 1982 Buick Skyhawk
• 1982 Cadillac Cimarron
• 1982 Chevrolet Cavalier
• 1982 Oldsmobile Firenza
• 1982
  Pontiac J2000

A stroked version of the 1.8-liter engine, displacing 2.0 liters, was introduced midway through 1982, to provide more low-end power for the J-cars. This engine replaced the 1.8-liter engine altogether and had

. It produced 86 hp (64 kW), and 110 lb⋅ft (150 N⋅m).

Applications:

• 1983–1986 Buick Skyhawk
• 1983–1986 Cadillac Cimarron
• 1983–1986 Chevrolet Cavalier
• 1983–1986 Oldsmobile Firenza
• 1983–1985
  Pontiac J2000/2000/Sunbird

This engine was similar to the LQ5, except that it used a two-barrel

engine in the fall of 1984 when production resumed for the 1985 model year. This engine produced 83 hp (62 kW) at 4600 rpm and 108 lb⋅ft (146 N⋅m) at 2400 rpm. Redline was 4750 rpm so full horsepower could never be sustained. The rear end of the S-series truck was geared so low that GM had to make the new overdrive transmission standard because with out the 4th gear this engine could only propel the truck safely to 50 mph without overheating. The trucks got 40% better gas mileage than the J-cars (all equipped with the 3 speed automatic) because of the 4 speed automatic overdrive. This engine was also the only S10 engine to have a direct-to-shaft non-clutched engine-driven fan, and wasn't ecm controlled (so it had no service engine soon light).

Applications:

• 1983–1984 Chevrolet S-10 and GMC S-15
• 1983–1984 Chevrolet S-10 Blazer and GMC S-15 Jimmy

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

Applications:

• 1987–1989 Buick Skyhawk
• 1987–1989 Chevrolet Beretta
• 1987–1989 Chevrolet Cavalier
• 1987–1989 Chevrolet Corsica
• 1987–1988 Oldsmobile Firenza
• 1987–1989 Pontiac Tempest

For the 1990 model year, GM replaced the 2.0-liter engine with a stroked version displacing 2.2 liters and using

(TBI). Commonly called the 2.2, it produced 95 hp (71 kW) and 120 lb⋅ft (163 N⋅m) of torque.

Applications:

• 1990–1991 Chevrolet Beretta
• 1990–1991 Chevrolet Cavalier
• 1990–1991 Chevrolet Corsica
• 1990–1991 Pontiac Tempest

For 1992, the 2.2 received

engine as the 4-cylinder offering in the S/T 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-liter DOHC

Applications:

• 1993–1996 Buick Century
• 1992–1996 Chevrolet Beretta
• 1992–2002 Chevrolet Cavalier
• 1992–1996 Chevrolet Corsica
• 1993 Chevrolet Lumina
• 1994-1997 Chevrolet S-10, GMC Sonoma, and Isuzu Hombre
• 1993–1994 Grumman LLV
• 1993–1996 Oldsmobile Cutlass Ciera
• 1995–2002 Pontiac Sunfire

The Vortec 2200 (RPO code L43) is an OHV

This engine did not commonly come with an EGR valve from 1998-2002 on the S-series trucks despite earlier versions using one. Instead a block off plate is on the back of the cylinder head. The camshaft on the 1998 model year uses a higher lift design. (0.288 inches intake and exhaust.) Meanwhile the 1999 and newer trucks use a lower lift camshaft. (0.263 inches intake and exhaust.) This was pulled from the Haynes automotive manual for the S series trucks.

Applications:

• 1998–2002 Chevrolet S-10, GMC Sonoma, and Isuzu Hombre