Mitsubishi Saturn engine

Mitsubishi Saturn engine
4G3
Manufacturer Mitsubishi Motors
Also called Saturn
Production 1969–1999
Cylinder block alloy Cast iron

The Mitsubishi Saturn or 4G3 engine is series of straight-4 internal combustion engines introduced by Mitsubishi Motors in 1969, along with the Astron, Orion, and Sirius. Displacement ranges from 1.2 L to 1.8 L.

Contents

4G30

The 4G30 displaces 1.3 L (1,289 cc). It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was 87 hp.

Bore x Stroke: 73.0 x 77.0 mm

Applications:

4G31

The 4G31 displaces 1.5 L (1,499 cc). It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was 95-105 hp depending on which carburetor combo was used.

Bore x Stroke: 74.5 x 86.0 mm

Applications:

4G32

The 4G32 displaces 1.6 L (1,597 cc). It is an 8-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 110 hp (SAE).

4G32 ECI engine in a Mitsubishi Mirage

A version of the 4G32 engine was made with a DOHC 8 valve cylinder head, and fitted with two twin choke 40mm Solex sidedraught carburettors. A version with an early iteration of Mitsubishi's MCA lean-burn system (MCA-IIB), fulfilling the Japanese exhaust regulations for 1975 (50年), was called G32A. Those with the later, cleaner yet, "MCA-Jet" system were called G32B. Later, the G32B also came in a fuel injected, turbocharged model.

Bore x Stroke: 76.9 x 86.0 mm (3.03" x 3.39")

Applications:

4G33

The 4G33 displaces 1.4 L (1,439 cc) from a 73.0 x 86.0 mm bore and stroke. There was also an MCA-Jet equipped G33B developed to fulfill the 1978 (53年) Japanese emissions regulations.

Applications:

4G35

The 4G35 displaces 1.7 L (1,686 cc). It is an 8-valve SOHC design with an aluminium head and iron block. The engine has five main bearings. Power was 105-115 hp depending on which carburetor combo was used.

Bore x Stroke: 79.0 x 86.0 mm

Applications:

4G36

The 4G36 displaces 1.2 L (1,238 cc). 73.0 x 74.0 mm bore and stroke.

Applications:

4G37

The 8-valve SOHC 4G37 displaces 1.8 L (1,755 cc).

Bore x Stroke: 80.6mm x 86.0mm(3.17in x 3.39in)

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 2.0 L (1,994 cc) 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.

Applications:

See also

  • List of Mitsubishi engines

References

  1. ^ Mastrostefano, Raffaele, ed (1990) (in Italian). Quattroruote: Tutte le Auto del Mondo 1990. Milano: Editoriale Domus S.p.A. pp. 200–201. 

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