Mitsubishi Neptune engine

Last updated
Neptune engine
Overview
Manufacturer Mitsubishi Motors
Also called4G4
Production1971–1979
Layout
Configuration Inline-4
Displacement 1.2–1.4 L (1,188–1,378 cc)
Cylinder bore 71 mm (2.8 in)
76.5 mm (3.01 in)
Piston stroke 75 mm (2.95 in)
Block material Cast iron
Valvetrain OHV 2 valves x cyl.
Compression ratio 9.0:1
Combustion
Fuel type Gasoline
Cooling system Water-cooled
Output
Power output 70–87 PS (51–64 kW; 69–86 hp)
Torque output 9.7–11.7 kg⋅m (95–115 N⋅m; 70–85 lb⋅ft)
Chronology
Predecessor KE engine
Successor 4G1 Orion

The Mitsubishi Neptune or 4G4 engine is a series of iron-block OHV inline-four engines built by Mitsubishi Motors from 1971 to 1979, alongside the Orion , Saturn , Astron , and Sirius . This was to be Mitsubishi's last OHV engine. The inability to clear new passenger car emissions rules for 1978 meant that the Neptunes were replaced by the 4G1 Orion. The Neptune continued to be built until 1979 for commercial vehicles, which suffered less restrictive environmental regulations.

Contents

4G41

Displacement1.4 L (1,378 cc)
Bore x Stroke76.5 mm × 75 mm (3.01 in × 2.95 in)
Power87 PS (64 kW; 86 hp) at 6,000 rpm (Galant FTO)

28 PS (21 kW; 28 hp) at 2,700 rpm in a 1972 FG15 forklift [1]

Torque11.7 kg⋅m (115 N⋅m; 85 lb⋅ft) at 4,000 rpm

8.6 kg⋅m (84 N⋅m; 62 lb⋅ft) at 2,000 rpm in a 1972 FG15 forklift [1]

Applications

4G42

Displacement1.2 L (1,188 cc)
Bore x Stroke71 mm × 75 mm (2.80 in × 2.95 in)
Power70 PS (51 kW; 69 hp) SAE at 6,000 rpm
Torque9.7 kg⋅m (95 N⋅m; 70 lb⋅ft) at 4,000 rpm

Applications

See also

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References

  1. 1 2 自動車ガイドブック: Japanese motor vehicles guide book 1972—73 (in Japanese), vol. 19, Japan: Japan Automobile Manufacturers Association, 1972-10-23, p. 294