Other 6G7x Motors
Other  motors Chrysler & Mitsubishi Used Elsewhere - Beta 2.55

Recently someone showed me an obscure varient of the MMC 6G7x series of motors I'd never seen or heard of before.  I ended up being intreged by this motor and started doing a little research online to see what I could find.  What I dug up on websites from different countries in the world really made me scratch my head.  I'll start with a little 3.0L history before I get to the motor I was showed. 

Were going to go back to the 1986 model year in the Japan market.  Mitsubishi introduced the Debonair V which was an upscale sedan aimed at business executives.  Along with the Debonair V Mitsubishi released their first V6 engines used in an automotive application.  The 6G71 & 6G72.  The 6G71 is a 2.0L SOHC V6 while the 6G72 was a 3.0L SOHC V6.  Both engines were a member of Mitsubishi's Cyclone series of engines.

6G71 Engine
6G71 2.0L SOHC V6 Circa 1986
6G71circa91
6G71 Circa '91

early 6G72
Early 6G72 - Circa 1987 Japan

6G72 circa '92
6G72 12V SOHC Circa 1992 Diamante

The 6G71 2.0L SOHC V6 has a displacement of 1998cc with a 74.7mm bore & 76mm stroke, and a compression ratio of 8.9:1  The 6G72 SOHC V6 basic specs are the same as the version introduced by Chrysler in their minivans in the 1987 model year.  Both motors share a stroke in common, but the bore is different.  I'd imagine the motors have different heads also because of the requred changes of size required in the combustion chamber area of the head.

An LPG version of the 6G71 was available in late 1987 and saw production through mid 1992.  When the 6G71 LPG was phased out a 6G72 version was phased in. 

Here is the headgaskets for these two motors.  You can see they are simillar, but yet very different. 

6G71 head gasket
 6G71 Head Gasket Pn#MD127003
6G72 Head Gasket
6G72 Head Gasket pn#MD165614

6G71 & 6G72 Valve cover gasket Pn#MD120091

In 1987 Mitsubishi went a step further with the new 6G7x motor family and introduced a V6 engine varient of the 6G71 in a supercharged flavor.  This motor found it's way into the Debonair V.

cyclone SOHC G671 6G71 Cyclone 2

Digging on the web there is literally nothing out there on this motor.  This variant was actually thought to be a myth before the above pictured motor found it's way on ebay.  This motor was eventually purchased by a member of the fwdmoparmuscle mailing list, but has yet to be installed in a vehicle.  It's intake looks like it shares some in common with the Chrysler variant of the 6G72 SOHC.  This motor is also the one that prompted me to write that page. 

The 6G71 from what I have been able to find out had a production run from 1986 to 1992 and was found in the Japanese, Austrailain, New Zealand, & Russian Markets.  The motor eventually found it's way into the Diamante. 

http://www.sp.dianet.or.jp/mmc/docs1/Frankfurt_Motor_Show/Galant/

1988 brought a varient of the 6G72 called the G6AT that was exclusively used by Hyundai in the Sonata.  This motor saw use until 1998.  With the introduction of the Y2 Sonata's the designation was changed to G6CT.  Internal specs are based on the Chrysler version & upper intake system was unique to it.  It was replaced by a 2.5L SOHC V6(G6BV aka 6G73) in 1999 and in 2002 was replaced by a 2.7L V6.

6GAT

G6AT Circa 1989


6GCT Intake 1995-1998.  1995 Pictured.


6GAT/6GCT  3.0L SOHC Specs
Type V-6  
SOHC
12 valves total
2 valves per cylinder 
Bore × stroke 91.10mm × 76.00mm 
3.59 in × 2.99 in 
Bore/Stroke ratio 1.2 
Displacement 2972 cc
(181.363 cu in) 
Unitary capacity 495.33 cc/cylinder 
Catalytic Converter
Max. output
(DIN)
144 PS (142.0 bhp) (105.9 kW)
@5000 rpm 
Max. torque
(DIN)
228.0 nm (168 lbft) (23.3 kgm)
@2500 rpm 
Compression
8.9:1


In 1989 the 6G72 found it's way into the Pajero, Montero, & Dodge Raider in a RWD configuration worldwide.  1990 would see it introduced in the Dodge D50 pickup with the same setup as the Montero recieved.  The 3.0L SOHC was offered until the D50 was discontinued in 1992. 

6G72 RWD
6G72 RWD

6G72 3.0L SOHC Pajero Spec's - 1989
Type V-6  
SOHC
12 valves total
2 valves per cylinder 
Bore × stroke 91.10mm × 76.00mm 
3.59 in × 2.99 in 
Bore/Stroke ratio 1.2 
Displacement 2972 cc
(181.363 cu in) 
Unitary capacity 495.33 cc/cylinder 
Catalytic Converter
Max. output
(DIN)
152.1 PS (150.0 bhp) (111.9 kW)
@5000 rpm 
Max. torque
(DIN)
184.0 nm (136 lbft) (18.8 kgm)
@4000 rpm 
Compression ratio
8.90:1


intake illustruation 6G72 RWD
Intake Blowup 6G72 RWD Intake


1990 saw the introduction of the 6G72 3.0L DOHC V6 in the GTO.  This engine was available in both naturally aspirated & twin turbo flavors.  This is also Mitsubishi's first V6 engine to offer DIS(Distributorless Ignition) and their first DOHC V6 engines.  The Sigma(Japan Market) also recieved the 24 Valve N/A version, but it was rated at 20hp less than the GTO.  The hosepower ratings were upped to 222hp on the N/A version in 1993.  The SOHC N/A version would eventually become available in other models such as the Diamante in 1992.

Type V-6  
DOHC
24 valves total
4 valves per cylinder 
Bore × stroke 91.10mm × 76.00mm 
3.59 in × 2.99 in 
Bore/Stroke ratio 1.2 
Displacement 2972 cc
(181.363 cu in) 
Unitary capacity 495.33 cc/cylinder 
Catalytic Converter
Max. output 225.1 PS (222.0 bhp) (165.5 kW)
 
Max. torque 273.0 nm (201 lbft) (27.8 kgm)

Compression
10:1
6G72 3.0L DOHC Spec's
Type V-6  
DOHC
24 valves total
4 valves per cylinder 
Bore × stroke 91.10mm × 76.00mm 
3.59 in × 2.99 in 
Bore/Stroke ratio 1.2 
Displacement 2972 cc
(181.363 cu in) 
Unitary capacity 495.33 cc/cylinder 
Catalytic Converter
Max. output
(DIN)
285.9 PS (282.0 bhp) (210.3 kW)
@6000 rpm 
Max. torque
(DIN)
407.0 nm (300 lbft) (41.5 kgm)
@3000 rpm 
Compression
8.0:1
6G72 3.0L DOHC Twin Turbo Spec's

In 1992 in the Japanese market yet another variant of the 6G7x family showed up.  The 6G74.  The 6G74 was a 3.5L 24 Valve DOHC V6.  This engine would eventually find it's way to the United States in the Diamante & Montero.  There is also a 24 valve SOHC varient of the 6G74 used in the Montero & Diamante.  On SOHC versions of the motor the Montero recieved DIS while all other SOHC applications recieved a distributor ran off the cam on the back head.  All DOHC versions were DIS.

6G74 Japan Market
6G74 in Diamante - Japan Market Circa '94

In 1993 the Galant & Sigma(Japanese Market) shows up on the scene with a new 24Valve DOHC flavor of the 6G71 motor referred to as the 6A12.  In 1994 this motor finds it's way into the FTO.  The Galant saw this version through 1996 in a few parts of the world & the FTO saw it to the end of it's production run.

Other varients of the 6A12 are around, but little info is available on them.  The 6A10, 6A11, & 6A13 were the other engines in the 6A1x series of engines.  The 6A13 is a 2.5L DOHC engine that went into production around 1996 in Japan.

Type V-6  
DOHC
24 valves total
4 valves per cylinder 
Bore × stroke 78.40mm × 69.00mm 
3.09 in × 2.72 in 
Bore/Stroke ratio 1.14 
Displacement 1998 cc
(121.925 cu in) 
Unitary capacity 333 cc/cylinder 
Catalytic Converter
Max. output
(DIN)
149 PS (147.0 bhp) (109.6 kW)
@6750 rpm 
Max. torque
(DIN)
179.0 nm (132 lbft) (18.3 kgm)
@4000 rpm 
General  Specs on the 6A12
Type V-6  
DOHC
24 valves total
4 valves per cylinder 
Bore × stroke 81.00mm × 80.80mm 
3.19 in × 3.18 in 
Bore/Stroke ratio
Displacement 2498 cc
(152.437 cu in) 
Unitary capacity 416.33 cc/cylinder 
Catalytic Converter
Max. output
(DIN)
170.3 PS (168.0 bhp) (125.3 kW)
@6000 rpm 
Max. torque
(DIN)
215.0 nm (159 lbft) (21.9 kgm)
@4000 rpm 
Also in 1993 the 6G73 appreared


6G71 circa 1998
6A12 MIVAC DOHC 24V V6 - Circa 1998

1995 Saw the introduction of a new 6G72 engine.  This one being a 24 Valve SOHC.  This motor would eventually find it's way into the Eclipse in 2000 and in some Chrysler models built on Mitsubishi platforms. 

6G74 Turbo Varient
6G74 DOHC Turbo Variant.

Sometime in the late '90's the above pictured motor showed up.  Where it was used I have not been able to find out.  All I know is it is a DOHC 6G74 twin turbo.  I have recieved a few emails on this motor and will post some information shortly.  I just need to go through it and analyze it.

Upwards of the year 2000 the Galant recieved a turbocharged version of the 6G73 engine.  Some info on the VR4 Galant can be found here:

http://www.live2cruize.com/galantvr4.htm 

http://www.quantum.net.au/ablew/galant.htm


Other 6G7x sites of interest

Swapping a JSPEC  3.5L 6G74 from a Mitsubishi Debonaire (I think) into my 92 Stealth Twin turbo.


I'm always looking for more information about oddball varients of the 6G7x motor family.  If you have any info please feel free to drop me an email.   I'd be glad to hear from you with any information you may have.



Visitors Since 07/30/2003  Last Updated 01//2005