Mitsubishi Neptune engine

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.

Neptune engine
Overview
ManufacturerMitsubishi Motors
Also called4G4
Production1971–1979
Layout
ConfigurationInline-4
Displacement1.2–1.4 L (1,188–1,378 cc)
Cylinder bore71 mm (2.8 in)
76.5 mm (3.01 in)
Piston stroke75 mm (2.95 in)
Block materialCast iron
ValvetrainOHV 2 valves x cyl.
Compression ratio9.0:1
Combustion
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output70–87 PS (51–64 kW; 69–86 hp)
Torque output9.7–11.7 kg⋅m (95–115 N⋅m; 70–85 lb⋅ft)
Chronology
PredecessorKE engine
Successor4G1 Orion

4G41

Displacement — 1.4 L (1,378 cc)
Bore x Stroke — 76.5 mm × 75 mm (3.01 in × 2.95 in)
Power — 87 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]

Torque — 11.7 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

Displacement — 1.2 L (1,188 cc)
Bore x Stroke — 71 mm × 75 mm (2.80 in × 2.95 in)
Power — 70 PS (51 kW; 69 hp) SAE at 6,000 rpm
Torque — 9.7 kg⋅m (95 N⋅m; 70 lb⋅ft) at 4,000 rpm

Applications

See also

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