The Mitsubishi Neptune or 4G4 engine is a series of iron-block OHV inline-four engines built by Mitsubishi Motors from June 1971 to 1981. 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 and until about 1981 for other applications. Around 520,000 Neptune engines were built.

4G41

Displacement — 1378 cc Bore x Stroke — 76.5x75 mm Power — 86 PS at 6,000 rpm (single carb) Torque — 11.7 kgm at 4,000 rpm (single carb)

Applications

4G42

Displacement — 1188 cc Bore x Stroke — 71x75 mm Power — 70 PS SAE at 6,000 rpm Torque — 9.7 kgm at 4,000 rpm

Applications