The G6AU and G4HC (both also called the 3.5 D ) are the large 3,497 cc (3.497 L; 213.4 cu in) versions of the Sigma engine. Bore and stroke are both larger at 93 mm (3.7 in) and 85.8 mm (3.38 in) respectively. Output is 200 hp (149 kW) at 5500 rpm and 214 lb·ft (290 N m) at 4800 rpm for the older G6AU V6 and 217 hp (162 kW) at 5500 rpm and 232 lb·ft (314 N m) at 3500 rpm for the new G4HC Sigma.
The 3.5 D has a cast iron engine block and aluminum DOHC cylinder heads. It uses MFI 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 194 hp (145 kW) at 5500 rpm with 219 lb·ft (297 N m) of torque at 3500 rpm. It was introduced with the Kia Sedona minivan in 2001.[WIKI]
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