Mitsubishi Engine History & Turbo's

[Wodjno]

The number and lettering system of Mitsubishi engines can be a little

confusing, so here is how to decipher them:

Numerical Prefix -

4 = four cylinder

6 = six cylinder

Numerical Suffix -

12 = 2.0 litre

13 = 2.5 litre

36 = 2.0 litre

54 = 2.6 litre

61 = 1.6 litre

62 = 1.85 litre

63 = 2.0 litre

64 = 2.4 litre

72 = 3.0 litre

73 = 2.5 litre

74 = 3.5 litre

91 = 1.5 litre

92 = 1.6 litre

93 = 1.8 litre

Sixes



The entire range of high performance Mitsubishi sixes is set in a V

configuration. Starting off with the most powerful, the 6G72 twin turbo

engine is responsible for pushing the heavy 3000GT/GTO to 100 km/h in

around five seconds. Its attributes are a displacement of 3.0 litres,

8.0:1 compression, quad cams, 24 valves, twin (simultaneous) turbos, dual

air-to-air intercoolers and a sophisticated EFI system - all giving a

total output of 209kW at 6000 rpm, with a bag of 427Nm at only 2500 rpm!

Now that would make one awesomely flexible road-car engine! In

development of this engine has been quite minor in comparison to the

Nissan RB26DETT, but we'd expect that you could attain around 300kW with

simple exhaust, intake, intercooler and boost modifications.

A high performance naturally aspirated version of this engine (also

called the 6G72), is available minus all the turbo intake trickery, but

with a higher static compression ratio of 11.0 to help compensate. It

makes 179kW at 5750 and 304Nm at 3500. A lower spec trim again can be

found, which is good for 168kW and 275Nm, and yet another (as in the

Japanese Diamante/Magna) is capable of 127kW and 248Nm.

About 17% larger at 3.5 litres, the DOHC 6G74 turbo comes suitable for

front and all-wheel-drive and produces 194 kW at 6000 rpm.




The Japanese market Diamante is also powered by a 10.0:1 compression

ratio atmospherically inducted 6G74 3.5 litre, that produces 194kW at

6000 and 324Nm at 4500 rpm. In between the 3.0 and 2.0 V6s is the 6G73

2.5 litre motor. Available in FWD atmo form only, this DOHC powerplant

shares its basic design with the other engines in the 6G range, and is

good for 131kW at 6000 revs.

A way - other than by turbocharging - that Mitsubishi has been able to

develop big power from their engines has been through the use of the

latest MIVEC (Mitsubishi Innovative Valve and Lift Electronic Control

System) technology. This system employs a multi-mode variable valve

timing mechanism set in three modes - low speed, high speed and MD

(modulated displacement). The resulting optimised flow of gas through the

heads enables these engines to deliver a substantial increase in torque

across the entire rev range - but especially in the higher revs, where

conventional engines are usually set with conservative valve lift and

duration.



Displacing only 2 litres, the atmo MIVEC version of the 6A12 DOHC V6 with

its 10.0:1 compression ratio is listed at an impressive 149kW at 7500 rpm

and 200Nm at 6000. This engine is most widely-noted for its fitment to

the sexy looking Mitsubishi FTO, which it powers from 0-100 km/h in under

8 seconds. There's also another atmo 6A12 engine (in either FWD or AWD

configuration) that is the same as above but minus the MIVEC system and

some compression points. It is capable of delivering a total of 127kW at

lower revs




A turbo version of the non-MIVEC 6A12 engine was released too, which

could pull 149kW - the same peak power as the wonderful atmo inducted

MIVEC!

Fours
Mitsubishi's selection of four cylinders is where the company has earned

the majority of its performance reputation.

One of the old-school engines Mitsubishi produced in the 80s is the SOHC

injected G63B turbo. This engine came available in a number of different

specs, but the most desirable is the 3 valves per cylinder 2 litre DASH

engine which came in either FWD and RWD guise. This non-intercooled

engine was able to stomp out a creditable 149kW at 6000 rpm and 280Nm of

torque.

However, the more common version of this engine (also called the G63B) is

the 2 valves per cylinder SOHC as found in the Starion/Conquest. This is

still capable of a reasonable 131kW at 5500 rpm and 216Nm at 3500 rpm.



At about the same time (the early 80s) the Mitsubishi Cordia GSR hit the

streets with very similar technology to the G63B - albeit in a smaller

overall package, called the G62B. This 1.85 litre SOHC four was also

non-intercooled (like most turbos of the time), and in the ultimate

versions used a large capacity turbocharger to help it on the way to a

maximum of 119kW at 5800 rpm and 216Nm at 3500.



The next generation of Mitsu fours was all based on the same blocks as

those mentioned above, but sported DOHC heads to aid breathing. Amongst

this late-80s group of engines is the front wheel drive 4G36 that came in

some of the mid/compact size vehicles, sweeping a volume of 2.0 litres

and producing 104kW at 6000 rpm.

One of the engines most widely used in competition (especially rally) is

the DOHC 4G63 turbo engine. Available in a variety of specs, this engine

comes in 2.0 litre capacity and is good for up to 209kW at 6500rpm, and

373Nm at 3000 in the Evolution 6.





Released in both FWD and 4WD configurations, the double over head cam

4G93 atmo and turbo moves 1.8 litres, and generates 112kW at 6500 and

145kW at 6000 rpm respectively. One power-pack for the compact

Japanese-spec Lancer GSR hatches was the 4G61 engine that pushed around

1.6 litres, used DOHCs and a single intercooled turbo to create a maximum

of 108kW at 6000 revolutions. A smaller engine, the 1.5 litre DOHC 4G91,

was a front-wheel-drive-only engine that was designed for use in

hatchbacks, mustering up 86kW at 6000 revs with a peak of 137Nm of

torque.

The latest MIVEC four cylinder is becoming quite popular in (the

only country where it is commercially available), and is an optional

fitment to the Mirage, FTO and Lancer. The engine we're interested in

here is the 1.6 litre 4G92 front wheel drive, that's good for an

astounding 131 kW at a substantial 7500 revs per minute, plus 167Nm of

torque at a sky-high 7000. This awesome little engine therefore has a

specific power output of 81.8kW per litre - enough to rival even some of

the best of the current turbo engines!

Mitsubishi performance motors at a glance...

Sixes

6G74 3.5 DOHC turbo
194kW
6G74 3.5 DOHC 194kW
6G72 3.0 DOHC twin turbo 209kW
6G72 3.0 DOHC 179kW/127kW
6G73 2.5 DOHC 131kW
6A12 2.0 DOHC MIVEC 149kW
6A12 2.0 DOHC turbo 149kW
6A12 2.0 DOHC 127kW

Fours
4G63 2.0 DOHC turbo 164kW
G63B DASH 2.0 SOHC 12 valve turbo 149kW
G63B 2.0 SOHC turbo 131kW
G62B 1.85 litre SOHC turbo 119kW
4G64 2.4 SOHC 108kW
G54B 2.6 SOHC turbo 131kW
4G91 1.5 DOHC 86kW
4G92 1.6 DOHC MIVEC 131kW
4G93 1.8 DOHC 112kW
4G93 1.8 DOHC turbo 145kW
4G36 2.0 DOHC 104kW
4G61 1.6 DOHC turbo 108kW
4g32 - 1600cc
4g33 - 1800cc
4g34 - 1400cc


MORE:

Example: 4G61T (1.6L I4 turbo motor in the Colt/Mirage turbo)
4 = 4-cylinder
G = Gasoline, Iron Block. (D = Diesel ie 4D65)
6 = Engine Series
1 = Engine Model (Doesn't equate to capacity, as a higher number can

belong to a lesser cc'd engine.)
T = Turbo (This is more of an adopted addition to the engine codes,

rather than an official part of it. The official way Mistubishi will list

the motor is "4G61 Turbo".)

Example: 6A13TT (2.5L V6 twin-turbo motor in the Galant/Legnum VR-4)
6 = 6-cylinder
A = Gasoline, Aluminum block
1 = Engine Series
3 = Engine Model
TT= Twin-turbo

Mitsubishi Engine Code Reference Chart

4D55 - 2.3L. Found in Galant 2.3 TD (A167) as well as Pajero (Shogun) 2.3

TD
4D56 - 2.5L. Used in Pajero (Shogun) 2.5 TD (L049G)

4D65 - 1.8L. Found in Galant 1.8 TD (E34A)
4D68 - 2.0L, 1998cc

4G11 - 1.2L, 1244cc
4G12 - 1.4L, 1410cc