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.
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 | petrol |
| 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 |
The engine was installed on:
- Mitsubishi Mirage 6 (A00) since 2012;
- Mitsubishi Space Star 2 (A00) since 2012.
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.
Frequently asked questions about the Mitsubishi 3A90
How much power does the Mitsubishi 3A90 make?
The Mitsubishi 3A90 develops 71 hp and 88 Nm of torque.
How much oil does the Mitsubishi 3A90 take and which one?
Engine oil capacity: 3.2 liters. Recommended oil: 5W-30.
Does the Mitsubishi 3A90 have a timing belt or chain?
The Mitsubishi 3A90 uses a timing chain.
Is the Mitsubishi 3A90 turbocharged?
No, the Mitsubishi 3A90 is naturally aspirated.
Does the Mitsubishi 3A90 need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Mitsubishi 3A90 last?
The typical lifespan of the Mitsubishi 3A90 is ~200 000 km with proper maintenance.
What is the fuel consumption of the Mitsubishi 3A90?
Mitsubishi Mirage 2016: city 4.6, highway 3.6, combined 4.0 L/100 km.
What cars was the Mitsubishi 3A90 installed on?
Mitsubishi Mirage 6 (A00) since 2012; Mitsubishi Space Star 2 (A00) since 2012.
What are the common problems of the Mitsubishi 3A90?
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. All known problems.
