Engine Mitsubishi 3A90

The 1.0-liter 3-cylinder Mitsubishi 3A90 engine has been assembled by the concern since 2012 and is installed in the sixth generation of the Mirage and its European version of the Space Star 2. This power unit has a very high compression ratio and does not tolerate bad fuel.

The 3A9 family also includes engines: 3A91 and 3A92.

The engine was installed on:

  • Mitsubishi Mirage 6 (A00) since 2012;
  • Mitsubishi Space Star 2 (A00) since 2012.

Specifications

Production years since 2012
Displacement, cc 999
Fuel system distributed injection
Power output, hp 71
Torque output, Nm 88
Cylinder block aluminum R3
Block head aluminum 12v
Cylinder bore, mm 75
Piston stroke, mm 75.4
Compression ratio 11.5
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator MIVEC
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 3.2
Fuel type 95
Euro standards EURO 5/6
Fuel consumption, L/100 km (for Mitsubishi Mirage 2016)
— city
— highway
— combined
4.6
3.6
4.0
Engine lifespan, km ~200 000
Weight, kg 90

Disadvantages of the Mitsubishi 3A90 engine

  • This motor has a high compression ratio and is prone to detonation from bad fuel;
  • Thin oil scraper rings lie about 100,000 km and oil consumption appears;
  • Closer to 150,000 km, the timing chain usually changes and often together with the phase regulator;
  • Weaknesses include a capricious electric throttle and a short-lived thermostat;
  • There are no hydraulic lifters here and valve clearances need to be adjusted periodically.

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