Hyundai Sigma engine

Σ engine ^Sigma engine
Overview
Manufacturer	Hyundai Motor Company
Production	1989–2007
Layout
Configuration	V6
Displacement	2.5 L; 152.4 cu in (2,497 cc) 3.0 L; 181.4 cu in (2,972 cc) 3.5 L; 213.4 cu in (3,497 cc)
Cylinder bore	83.5 mm (3.29 in) 91.1 mm (3.59 in) 93 mm (3.66 in)
Piston stroke	76 mm (2.99 in) 85.8 mm (3.38 in)
Cylinder block material	Cast iron
Cylinder head material	Aluminum
Valvetrain	SOHC, DOHC 4 valves x cyl.
Combustion
Fuel system	Multi-port fuel injection
Fuel type	Gasoline LPG
Cooling system	Water-cooled
Output
Power output	135–220 PS (99–162 kW; 133–217 hp)
Torque output	20.8–32 kg⋅m (204–314 N⋅m; 150–231 lbf⋅ft)
Chronology
Successor	Hyundai Lambda engine

The Hyundai Sigma engine is what Hyundai Motor Company called the Mitsubishi 6G7 engine when manufactured in South Korea. It is a series of V6 piston engines. The Sigma engine family began life with the simple V6 name. Displacement ranges from 2.5 to 3.5 L (2,497 to 3,497 cc).

2.5L (G6AV)

The DOHC G6AV (also called the 2.5 D, "D" for DOHC) is the small 2,497 cc (2.5 L; 152.4 cu in) version. Bore is 83.5 mm (3.29 in) and stroke is shared with the 3.0 L (2,972 cc) at 76 mm (2.99 in). Output is 162–173 PS (119–127 kW; 160–171 hp) at 6,000 rpm and 20.8–22.4 kg⋅m (204–220 N⋅m; 150–162 lbf⋅ft) at 4,500 rpm.

Applications

• Hyundai Dynasty (1997–2005)
• Hyundai Grandeur (LX) (1995–1998)
• Hyundai Marcia (1995–1998)

3.0L (G6AT/G6CT)

The DOHC G6AT and G6CT (also called the 3.0 D, "D" for DOHC) both displace 2,972 cc (3.0 L; 181.4 cu in). They share the 2.5's 76 mm (2.99 in) stroke but use a larger 91.1 mm (3.59 in) bore. Output for the older G6AT is 185–205 PS (136–151 kW; 182–202 hp) at 6,000 rpm and 24.6–27.1 kg⋅m (241–266 N⋅m; 178–196 lbf⋅ft) at 4,000–4,500 rpm, while the G6CT produces 187–196 PS (138–144 kW; 184–193 hp) at 5,500–6,000 rpm and 26.5–27.2 kg⋅m (260–267 N⋅m; 192–197 lbf⋅ft) at 3,500–4,000 rpm.

The older SOHC G6AT 3.0 S produces just 141–164 PS (104–121 kW; 139–162 hp) at 5,000 rpm and 22.9–24.5 kg⋅m (225–240 N⋅m; 166–177 lbf⋅ft) at 2,500–3,000 rpm.

Applications

• Hyundai Dynasty (1996–2005)
• Hyundai Equus (LZ) (1999–2005)
• Hyundai Galloper (1994–2000)
• Hyundai Grandeur (1989–2005)
• Hyundai Sonata (Y3) (1990–1998)
• Hyundai Starex (A1) (1999–2003)
• Hyundai XG300 (2001)
• Kia Opirus (2003–2006)

3.0L LPG (L6AT)

The L6AT displace 2,972 cc (3.0 L; 181.4 cu in). They share the 2.5's 76 mm (2.99 in) stroke but use a larger 91.1 mm (3.59 in) bore. Output is 135 PS (99 kW; 133 hp) at 4,500 rpm and 23–24 kg⋅m (226–235 N⋅m; 166–174 lbf⋅ft) at 2,500 rpm.

Applications

• Hyundai Galloper (1998–2003)
• Hyundai Libero (2000–2007)
• Hyundai Starex (A1) (1999–2003)

3.5L (G6AU/G6CU)

The G6AU and G6CU (both also called the 3.5 D ) are the large 3,497 cc (3.5 L; 213.4 cu in) versions of the Sigma engine. Bore and stroke are both larger at 93 mm × 85.8 mm (3.66 in × 3.38 in), respectively. Output is 203–225 PS (149–165 kW; 200–222 hp) at 5,500 rpm and 29.6–31.8 kg⋅m (290–312 N⋅m; 214–230 lbf⋅ft) at 4,000 rpm for the older G6AU and 195–220 PS (143–162 kW; 192–217 hp) at 5,500–6,000 rpm and 30–32 kg⋅m (294–314 N⋅m; 217–231 lbf⋅ft) at 3,500 rpm for the newer G6CU.

The 3.5 D has a cast iron engine block and aluminum DOHC cylinder heads. It uses Multi-port fuel injection, has 4 valves per cylinder, and features forged steel connecting rods. It is designed to run on "regular" unleaded gasoline rather than the premium fuel used in many other high-output V6 engines.

The US-market version produces 197 PS (145 kW; 194 hp) at 5,500 rpm with 30.3 kg⋅m (297 N⋅m; 219 lbf⋅ft) of torque at 3,500 rpm. It was introduced with the Kia Sedona minivan in 2001.

Applications

• Hyundai Dynasty (1996–1999)
• Hyundai Equus (LZ) (1999–2005)
• Hyundai Grandeur (1994–1996, 2002–2005)
• Hyundai Santa Fe (SM) (2002–2005)
• Hyundai Terracan (2001–2007)
• Hyundai XG350 (XG) (2002–2005)
• Kia Opirus (2003–2006)
• Kia Sedona (GQ) (2001–2005)
• Kia Sorento (BL) (2003–2006)

See also

• List of Hyundai engines
• Mitsubishi 6G7 engine