GM OHV engine
| 122 engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer | General Motors |
| Production | 1982-2003 |
| Combustion chamber | |
| Configuration | Straight-4 |
| Displacement |
|
| Cylinder bore | 89.0 mm (3.50 in) |
| Piston stroke |
|
| Cylinder block alloy | Cast Iron |
| Cylinder head alloy | |
| 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. 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.
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 hp (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:
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.
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