Mitsubishi's 6G7x family of engines (also known as the Cyclone V6) were Mitsubishi's first V6 engine, introduced to the Japanese market in 1986. The engines have a 60º vee angle, cast iron blocks with aluminum alloy cylinder heads and belt driven camshafts. The engine has seen service in front, rear and all-wheel drive applications. As with the Sirius family there can be many variants within a single model of engine.
As with many other Mitsubishi engine families, the 6G7x was also used in Hyundai and Chrysler vehicles.
The 6G71 is the rarest model of the 6G7x family, being a 2.0L single overhead cam V6 with 2 valves per cylinder. It displaces 1998cc with a 74.7mm bore and 76mm stroke.
The engine was available in normally aspirated versions (some with single-point fuel injection, others with multi-point fuel injection) with a 8.9:1 compression ratio and a supercharged version with a 8.0:1 ratio.
The supercharged engine was transversely mounted in some Japanese Debonair Vs and used a Mikuni DM51 supercharger and water-to-air intercooler. The supercharger was mounted to the front cylinder bank and connected directly to the throttle body.
Three variants of the engine were produced:
|6G71 with single point injection||77kW at 5000rpm||158Nm at 4000rpm|
|6G71 with multi-point injection||88kW at 5500rpm||172Nm at 4200rpm|
|6G71 Supercharged||110kW at 5000rpm||221Nm at 3000rpm|
The engine was never fitted to Australian market Mitsubishis.
The 6G72 has been produced in many different variants. It is a 3.0L V6 displacing 2972cc and has a 91.1mm bore and 76 mm stroke. All versions featured roller rockers and a one piece main bearing assembly.
The single overhead cam 12 valve (2 per cylinder) version was used in the Second Generation Magna/Verada and the single overhead cam 24 valve (4 per cylinder) version was used in the Third Generation Magna/Verada. For information on these engines see their respective pages.
There have been versions of the 6G72 which have been produced with double overhead camshafts with 24 valves, twin turbochargers and double overhead camshafts with MIVEC. Some versions also feature Mitsubishi Variable Intake Control.
When used by Hyundai the SOHC version was called G6AT (3.0S) and the DOHC version was known as G6HA (3.0D) or G6HCX
In Australia the engine has been used in:
- 6G72 SOHC 12v: Second Generation Mitsubishi Magna/Verada, Mitsubishi Pajero, Mitsubishi Triton, Mitsubishi Starwagon, Hyundai Sonata
- 6G72 SOHC 24v: Third Generation Mitsubishi Magna, Mitsubishi Triton, Mitsubishi Challenger.
- 6G72 DOHC 24v: Hyundai Sonata, Hyundai Grandeur
The 6G73 engine is a 2.5 Litre V6 displacing 2497cc with a 85.3mm bore and 76mm stroke, This engine was only ever produced with double overhead camshafts (with 24 valves) (SOHC in Chrysler applications), but strangely enough was available with both fuel injection and carburettor versions.
Hyundai also used this engine and designated it as G6AV. It was not widely used in vehicles on the Australian market.
The 6G74 is a 3.5 Litre engine displacing 3497cc. It has a bore of 93mm and a stroke of 85.8mm. The engine was available in single and overhead camshaft versions, all with 24 valves. Some versions of the engine also featured MIVEC and/or GDI. The engine was used in the Third Generation Magna/Verada.
The engine was also used by Hyundai and designated as G6AU and G6HC (3.5D).
In Australia the engine was fitted to:
- SOHC - Third Generation Mitsubishi Magna/Verada, Mitsubishi Pajero
- DOHC - Mitsubishi Pajero, Hyundai Terracan, Kia Sorento
The 6G75 is the latest addition to the 6G7x family. It is an 3.8 Litre V6 displacing (3828cc) with a 95mm bore and 90mm stroke. All versions of the engine have 24 valves, some with single overhead camshafts, some with double overhead camshafts. Some versions of the engine also feature MIVEC.
In Australia the engine was used in:
- SOHC - Mitsubishi 380, Mitsubishi Triton, Mitsubishi Pajero
- DOHC - Mitsubishi Pajero
|MITSUBISHI PETROL ENGINES|
|3A9x||3A90 3A91 3A92|
|Orion||4G11 4G12 4G13 4G15 4G17 4G18 4G19 G4ED|
|Sirius||4G61 4G62 4G63 4G64 4G67 4G69|
|Astron||4G51 4G52 4G53 4G54|
|Astron II||Original Revised|
|Saturn||4G30 4G31 4G32 4G33 4G37|
|4G9x||4G91 4G92 4G93 4G94|
|4A9x||4A90 4A91 4A92|
|4B1x||4B10 4B11 4B11T 4B12|
|6G7x||6G71 6G72 SOHC 12v 6G72 SOHC 24v 6G72 DOHC Early 6G74 Late 6G74 Ralliart 6G74 6G75|
|6A1x||6A10 6A11 6A12 6A13|