General Motors 90° V6 engine
| Chevrolet 90° V6 engine | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Production | 1978-2014 |
| Combustion chamber | |
| Displacement | 200 cid (3.3 L) 229 cid (3.8 L) 262 cid (4.3 L) |
| Cylinder bore | 3.50 in (89 mm) 3.736 in (95 mm) 4.00 in (102 mm) |
| Piston stroke | 3.48 in (88 mm) |
| Cylinder block alloy | |
| Cylinder head alloy | |
| Valvetrain | OHV |
| Chronology | |
| Predecessor | Chevrolet Straight-6 engine |
| LV3 | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Also called | EcoTec3 |
| Production | 2013-present |
| Combustion chamber | |
| Configuration | 90° V6 |
| Displacement | 4,301 cc (262.5 cu in) |
| Cylinder bore | 99.6 mm (3.92 in) |
| Piston stroke | 92 mm (3.6 in) |
| Cylinder block alloy | Aluminum |
| Cylinder head alloy | Aluminum |
| Valvetrain | OHV |
| Compression ratio | 11.0:1 |
| Combustion | |
| Fuel system | Direct injection |
| Management | E92 |
| Fuel type | |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Output | |
| Power output |
|
| Torque output |
|
| Chronology | |
| Predecessor | LU3 |
The Chevrolet 90° V6 family of engines began in 1978 with the Chevrolet 200 cid (3.3 L) V6 as the base engine for the all new 1978 Chevrolet Malibu. The original engine family was phased out in early 2014, with its final use as the 4.3 L V6 engine used in Chevrolet and GMC trucks and vans. Its phaseout marks the end of an era of Chevrolet small-block engine designs dating back to the 1955 model year. A new Generation V 4.3 L V6 variant entered production in late 2013, based on the LT1 small block V8 used in the 2014 Chevrolet Silverado.
These engines have a 90° vee block with 12 valves activated by a pushrod valvetrain. All engines have cast iron blocks and cylinder heads. The engines are based on the Chevrolet Small-Block engine, and the V6 is formed by the removal of the #3 and #6 cylinders. The V6s share the same 4.4-inch bore spacing and 9.025-inch deck height as the V8 engines. Many parts are interchangeable between the 90° V6 and the small block V8 including valvetrain components, bearings, piston assemblies, lubrication and cooling system components, and external accessories. The 90-degree V6 engine uses the same transmission bellhousing pattern as the Chevrolet small-block V8 engine. The oil pan dipstick is located on the passenger side above the oil pan rail; this design was phased in on both the V6-90 and Small Block Chevrolet assembly lines (for engines manufactured after 1979) sharing the same casting dies. All the engines use a 1-6-5-4-3-2 firing order. The engines in this family are longitudinal engines, and have been used in rear-wheel drive cars and trucks, industrial, and marine applications. As of 2012, the Chevrolet 90° V6 is currently produced at the GM Powertrain Division plant in Romulus, Michigan.
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