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Mitsubishi 6G72 Engine

 

The 6G72 was the name given to three liter displacing engine that belongs to 6G7 engine family. Basically there were four different versions, SOHC 12 valve, SOHC 24 valve, DOHC 24 valve and DOHC 24 valve twin-turbo. The production of 6G72 has started in 1990, since then Mitsubishi placed different versions of 6G72 engine in a wide range of models. Among all these models Mitsubishi GTO MR (JDM Version) Mitsubishi 3000GT VR-4 (European Version) Dodge Stealth R/T Twin Turbo (US & Canadian Version) were the only ones to receive the twin turbo version of 6G72 engine. Actually these cars were almost the same besides their badges.

 

 

6G72 twin-turbo was a 60 degree V6 was displacing 2972cc with 91.1mm bore x 76.0mm stroke. Cast iron block had thin walls that were reinforced with ribs to save weight. Cylinder block was housing thin wall aluminum pistons with short skirts to keep reciprocating mass to a minimum. These pistons had a compression ratio of 8.0:1. Forged connecting rods were attached to forged crankshaft that uses beam bearing caps for greater strength and reduced vibration. Cast aluminum heads used compact pentroof combustion chambers and centered spark plugs for increased combustion efficiency. The four cams were driven by a single toothed rubber belt. Oversized intake and exhaust valves were operated by aluminum roller rocker arms incorporating needle bearing rollers. These aluminum roller rocker arms were lighter and offered better valve control at high engine speeds.

 

Mitsubishi 6G72 Engine

 

Each bank of the V6 had its own independent turbocharger and intercooler. Mitsubishi built turbo chargers were water cooled to ensure longer service life. These turbochargers featured light turbines that could spool-up as low as 1600RPM. Turbo housings were stainless steel to reduce weight and improve heat resistance. The intercoolers were utilizing a pressure control system switch that monitored the air pressure downstream of the intercoolers, regulating the wastegate's release of excess boost. This system ensured maximum boost at all engine speeds. Air/fuel ratio was always kept at optimum with computer controlled multi port fuel injection system. The processor controlled each injector individually and calculated Air/fuel ratio according to the throttle position, RPM, intake air volume, coolant temperature and barometric pressure.

 

 

6G72 twin-turbo was easily making 325hp in European and US versions. However JDM versions were only making 280hp because of the regulations. The production of 6G72 twin-turbo ended along with Mitsubishi GTO in 2001.

 

 

Model

6G72

Displacement (cc)

2972

Power Output (hp)

280 - 325

Compression Ratio

8.0:1

Bore (mm)

91.1

Stroke (mm)

 76.0

Years Produced

1990 - 2001

 

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