Login
Login

Mitsubishi Saturn engine#4G32T

{{distinguish|Saturn I4 engine}}

{{More citations needed|date=November 2018}}

{{Use dmy dates|date=March 2020}}

{{Infobox automobile engine

| image = Mitsubishi G32B.jpg

| name = Mitsubishi Saturn engine

| aka = 4G3

| manufacturer = Mitsubishi Motors

| configuration = Straight-4 & Straight-6

| production = 1969–1999

| fueltype = Gasoline

| fuelsystem = Mikuni-built Solex carburetor
Central-point EFI

| coolingsystem = Water-cooled

| head = Aluminium

| block = Cast iron

| valvetrain = SOHC & DOHC, 2 valves x cyl.

| turbocharger = On G32B & 4G32T

| compression = 9.5:1

| displacement = {{cvt|1239-1994|cc|L|1|disp=flip}}

| bore = {{cvt|73|mm|2}}
{{cvt|74.5|mm|2}}
{{cvt|77|mm|2}}
{{cvt|79|mm|2}}
{{cvt|80.6|mm|2}}

| stroke = {{cvt|74|mm|2}}
{{cvt|77|mm|2}}
{{cvt|86|mm|2}}

| power = {{cvt|37-115|hp|kW|0}}

}}

The Mitsubishi Saturn or 4G3 engine is series of overhead camshaft (OHC) straight-four internal combustion engines introduced by Mitsubishi Motors and saw first service in the 1969 Colt Galant. Displacement ranges from {{cvt|1239|to|1755|cc|L|1|disp=flip}}, although there was also a rare {{convert|1994|cc|L|0|abbr=out|adj=on|disp=flip}} inline-six version built from 1970 until 1976. The early versions have chain driven valvetrain while the later versions are belt driven and equipped with balance shafts.

4G30

The 4G30 displaces {{cvt|1289|cc|L|1|disp=flip}}. It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was {{cvt|87|hp|0}}.

Bore x Stroke: {{cvt|73x77|mm|2}}

=Applications=

4G31

The 4G31 displaces {{cvt|1499|cc|L|1|disp=flip}}. It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was {{cvt|95-105|hp|0}} depending on which carburetor combo was used. An updated version with central-point electronic fuel injection was installed in Mirages and Lancers from 1986 on.{{cite book | title = Automobil Revue 1987 | ref = AR87 | editor-last = Büschi | editor-first = Hans-Ulrich | publisher = Hallwag AG | location = Berne, Switzerland | language = German, French | pages = 397–398 | volume = 82 |date=5 March 1987 | isbn = 3-444-00458-3 }} A version for industrial use has {{cvt|37|PS|kW|0}} at 3000 rpm.{{citation | ref = JAMA20 | title = 自動車ガイドブック: Japanese motor vehicles guide book 1973/1974 | language = Japanese | volume = 20 | date = 1973-10-30 | publisher = Japan Automobile Manufacturers Association | location = Japan | page = 298 }}

Bore x Stroke: {{cvt|74.5x86|mm|2}}

=Applications=

4G32

In 1970, the 4G32 was introduced, and it displaces {{cvt|1597|cc|L|1|disp=flip}}. It is an eight-valve SOHC design with an aluminium head and iron block. The engine has five main bearings, a cross flow head and a single down draught carburetor. Firing order is 1-3-4-2. The GSR versions used two twin-barrel Mikuni-built Solex carburetors for a total of {{cvt|110|hp|0}} (SAE).

File:4G32 EFI.jpg

A version with an early iteration of Mitsubishi's MCA lean-burn system (MCA-IIB), fulfilling the intermediate Japanese exhaust regulations for 1975, was called G32A. This was built for less than one year, as the new MCA engine arrived in November 1975. Those with the later, cleaner yet, "MCA-Jet" system were called G32B. Later, the G32B also came in a fuel injected, turbocharged model. For competition, a version of the 4G32 engine was made with a DOHC eight-valve cylinder head, and fitted with two twin-choke {{cvt|40|mm}} Solex sidedraft carburettors.

Bore x Stroke: {{cvt|77x86|mm|2}}

{{hidden begin

|title = Applications:

|titlestyle = background:#88FF88; text-align:left;

|bodystyle = text-align:left;

}}

{{hidden end}}

=4G32T=

Turbocharged version of the 4G32.

4G33

The 4G3 displaces {{cvt|1440|cc|L|1|disp=flip}} from a {{cvt|73x86|mm|2}} bore and stroke. There was also an MCA-Jet equipped G33B developed to fulfill the 1978 Japanese emissions regulations.

{{hidden begin

|title = Applications:

|titlestyle = background:#88FF88; text-align:left;

|bodystyle = text-align:left;

}}

{{hidden end}}

4G35

The 4G35 displaces {{cvt|1686|cc|L|1|disp=flip}}. It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was {{cvt|105-115|hp|0}} depending on which carburetor combo was used.

Bore x Stroke: {{cvt|79x86|mm|2}}

Applications:

4G36

The 4G36 displaces {{cvt|1239|cc|L|1|disp=flip}}. {{cvt|73x74|mm|2}} bore and stroke.

Applications:

4G37

The 8-valve SOHC 4G37 displaces {{cvt|1755|cc|L|1|disp=flip}}.

Bore x Stroke: {{cvt|80.6x86|mm|2}}

Compression Ratio: 9.5:1

Applications:

By other brands:

6G34

The 6G34, referred to by Mitsubishi as the Saturn 6, is a 12-valve SOHC straight-6 of {{cvt|1994|cc|L|1|disp=flip}} displacement.

The 6G34 was used only in the Mitsubishi Debonair Executive from September 1970 to June 1976, and saw very limited production. Effectively, the design was that of the standard Saturn four-cylinder block with two additional cylinders grafted on to replace the KE64.

Applications:

See also

{{commons category|Mitsubishi 4G3 engines}}

References

{{Reflist}}

  • [http://autospeed.com/cms/title_Engine-Epic-Part-8-Mitsubishi-Engines/A_0307/article.html "Engine Epic Part 8 - Mitsubishi Engines"], Michael Knowling, Autospeed, issue 48, 21 September 1999

{{Mitsubishi Motors technologies}}

{{DEFAULTSORT:Mitsubishi Saturn Engine}}

Saturn

Category:Straight-six engines

Category:Gasoline engines by model

Category:Straight-four engines