Mitsubishi 6G7 engine

6G7

Manufacturer	Mitsubishi Motors
Also called	Cyclone V6
Cylinder block alloy	Cast iron

The Mitsubishi 6G7 or Cyclone V6 engine is a series of V6 piston engines from Mitsubishi Motors. Five displacement variants have been produced with both single- and double- overhead camshaft layouts. MIVEC variable valve timing has also been implemented in some versions, and the 2.5 and 3.0 L versions were also available with gasoline direct injection. Modern versions feature a one-piece cast crankshaft and cast aluminum intake manifold.

6G71

The 6G71 is a 1998 cc version with a bore and stroke of 74.7 × 76 mm (2.94 × 2.99 in). It produced 88 kW (120 PS; 118 hp) at 5500 rpm and 172 N·m (127 ft·lbf) at 4500 rpm.

Applications

• Mitsubishi Debonair
• Mitsubishi Diamante

6G72

The 6G72 is a 2972 cc engine. Bore is 91.1 mm (3.59 in) and stroke is 76 mm (3.0 in). SOHC 12-valve, SOHC 24-valve, and DOHC 24-valve versions have been produced.

The latest version was used in the Mitsubishi Eclipse GT and Galant. Output in 2004 was 210 hp (157 kW; 213 PS) at 5500 rpm with 278 N·m (205 ft·lbf) of torque at 4000 rpm. It has a cast iron engine block and aluminum SOHC cylinder heads. It uses MPFI fuel injection, has four valves per cylinder with roller followers and features fracture-split forged steel connecting rods. In the older version, used in many Chrysler models since 1987 this V6 was a SOHC 12-valve developing 141 hp (105 kW) at 5000 rpm and 172 lb·ft (233 N·m) of torque at 3600 rpm. The Mitsubishi models were with a 3.0 Litre 6G72 engine SOHC 24-valve developing 195 hp (145 kW) at 5000 rpm and 205 lb·ft (278 N·m) of torque at 4000 rpm

The DOHC 24-Valve was used in the Mitsubishi 3000GT and Dodge Stealth producing 222 horsepower (166 kW) and 205 pound-feet (278 N·m) of torque in naturally aspirated form, and as much as 320 horsepower (240 kW) and 315 pound-feet (427 N·m) of torque in turbocharged form.^[1] Each bank of the V6 had its own independent turbocharger and intercooler. Turbo chargers were built by Mitsubishi. They were water cooled to ensure longer service life. ^[2]

Applications

• 1990–2001 Mitsubishi GTO (aka Mitsubishi 3000GT, Dodge Stealth)
• 1989–1995 Plymouth Acclaim/Dodge Spirit/Chrysler Saratoga
• 1987–2000 Dodge Caravan/Plymouth Voyager
• 1990–1993 Dodge Ram 50
• 1988–1993 Dodge Dynasty
• 1988–1990 Dodge Raider
• 1991-1996 Dodge Stealth
• 1990–1995 Chrysler LeBaron
• 1990–1991 Chrysler TC by Maserati
• 1988–1989 Chrysler New Yorker
• 1995–2001 Dodge Stratus
• 1990–1993 Dodge Daytona
• 1992–1994 Dodge Shadow ES
• 1992–1994 Plymouth Duster
• 1986-1992 Mitsubishi Debonair
• 2000–2005 Mitsubishi Eclipse
• 1999–2003 Mitsubishi Galant
• 1988-1990 Mitsubishi Sigma
• 1990–1998 Hyundai Sonata
• 2001–2005 Dodge Stratus/Chrysler Sebring Coupe
• 1990–2002 Mitsubishi Diamante
• 1991–1996 Mitsubishi Verada (Australia)
• 1993–2001 Mitsubishi Magna (Australia)
• 1990–2006 Mitsubishi L200
• 1990–1996 Mitsubishi Mighty Max
• 1988–1997 Mitsubishi Pajero (aka Montero/Shogun) (Japanese and Middle East markets)
• 1997–present Mitsubishi Challenger (aka Montero Sport)
• 1994-2007 Mitsubishi L400(aka Space Gear)

6G73

The 6G73 displaced 2497 cc. It was a 24-valve SOHC design with 2 valves running off one cam lobe, with a smaller bore than the 3.0 liter version of the same block. Bore and stroke were 83.5 × 76 mm (3.29 × 2.99 in); it was a 60-degree V6 and weighed around 155 kg (340 lb). The engine had low-profile cast aluminum heads which helped it to fit into small engine bays, while pent-roof combustion chambers increased efficiency and made room for four valves per cylinder, arranged in a cross-flow pattern with a "tumble" intake port for both strong breathing and low emissions. Spark plugs were centered in the combustion chambers. The intake valves were 33 mm (1.30 in) in diameter while exhaust valves were 29 mm (1.14 in). A toothed timing belt was used. The output of 6G73 was 161 hp (122 kW; 163 PS) at 5900 rpm with 221 Nm (163 lb-ft) of torque at 4350 rpm.^[3]

Applications

• 1995–2000 Chrysler Cirrus
• 1995–2000 Chrysler Sebring (Convertible)
• 1995–2000 Dodge Stratus
• 1995–2000 Dodge Avenger
• 1990–2002 Mitsubishi Diamante

6G74

The 6G74 is a 3497 cc 24-valve unit available with either SOHC, DOHC, or MIVEC DOHC. Bore is 93 mm and stroke is 85.8 mm. Output is 153 kW (208 PS; 205 hp) at 5000 rpm with 313 N·m (231 ft·lbf) of torque at 4000 rpm for the SOHC, 194 kW (264 PS; 260 hp) at 6000 and 324 N·m (239 ft·lbf) at 4500 rpm for the MIVEC. The most common 6G74 has a cast iron engine block and an aluminum cylinder head. It uses MFI fuel injection and uses forged steel connecting rods. The MIVEC version of this engine was only available in the Mitsubishi Pajero Evolution.

The gasoline direct injection version of the 6G74 was launched in April 1997 as the first GDI V6 engine ever produced. It differed from the basic 6G74 in many ways apart from its unique fuel injection system — it had a crown-curved rather than flat combustion chamber, upright intake ports rather than angled, and a 10.4:1 rather than 10.0:1 compression ratio. Mitsubishi claimed 30 percent better fuel economy, a 30 percent reduction in emissions, and higher power outputs than diesels.^[4]

Applications

• 1992-1998 Mitsubishi Debonair (Japan) (256HP)
• 1999–2005 Mitsubishi Magna (Australia) (1996-2005 Mitsubishi Verada)
• 1993–2004 Mitsubishi Pajero (aka Montero/Shogun)
• 2000–2005 Mitsubishi Diamante
• 2008–present Mitsubishi Triton (Japan Domestic and Brazil Market)
• 2007-present Pajero Sport/Mitsubishi Challenger

6G75

The 6G75 is a 3828 cc version with 95 mm (3.74 in) bore and 90 mm (3.54 in) stroke. Output varies from 172 kW (234 PS; 231 hp) and 339 N·m (250 ft·lbf) to 197 kW (268 PS; 264 hp) and 353 N·m (260 ft·lbf) depending on application. It has forged steel connecting rods.

Applications

• 2003–present Mitsubishi Pajero (aka Montero/Shogun)
• 2004–present Mitsubishi Endeavor
• 2004–2009 Mitsubishi Galant
• 2006–present Mitsubishi Eclipse
• 2005–2008 Mitsubishi 380

See also

• List of Mitsubishi engines

References

1. ^ 1996 Mitsubishi 3000GT: Specs and Features
2. ^ JDM Spec Engines - Mitsubishi 6G72 Engine
3. ^ "The Mitsubishi 2.5 Liter V6 Engine". Allpar, LLC. 1995. http://www.allpar.com/mopar/25V6.html. 
4. ^ "Press release: Mitsubishi Motors Adds World First V6 3.5-liter GDI Engine to Ultra-efficiency GDI Series". Mitsubishi-Motors.com. http://media.mitsubishi-motors.com/pressrelease/e/corporate/detail215.html. Retrieved 2006-03-16.