The Mitsubishi 3A91 is a 1,193 cc, inline‑three naturally aspirated petrol engine produced between 2008 and 2017. It features dual overhead camshafts (DOHC), 12 valves, and Mitsubishi’s MIVEC variable valve timing system. In standard form it delivered 59–63 kW (80–86 PS) and torque figures between 106–115 Nm, offering responsive low‑end performance for city driving.
Fitted to models such as the Mitsubishi Colt, Mirage, and ASX (in select markets), the 3A91 was engine…
Production years 2008–2010 meet Euro 4 standards; 2011–2017 models meet Euro 5 depending on market (JAMA Type Approval #JAMA/EMS/3A91).
The Mitsubishi 3A91 is a 1,193 cc inline‑three naturally aspirated petrol engine engineered for subcompact and compact models (2008–2017). It combines DOHC with MIVEC variable valve timing to deliver responsive low‑rpm performance and urban fuel efficiency. Designed to meet Euro 4 (early builds) and Euro 5 (later builds) standards, it balances light weight with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,193 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑3, DOHC, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 75.0 mm × 90.0 mm | |
Power output | 59–63 kW (80–86 PS) @ 6,000 rpm | |
Torque | 106–115 Nm @ 4,000 rpm | |
Fuel system | Multi‑point fuel injection (MPFI) | |
Emissions standard | Euro 4 (2008–2010); Euro 5 (2011–2017) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven DOHC | |
Oil type | API SN/ILSAC GF‑5, SAE 5W‑30 | |
Dry weight | 87 kg |
The Mitsubishi 3A91 was used across Mitsubishi's Global Small Car platform with transverse mounting and licensed to Renault for select European models. This engine received platform-specific adaptations-shortened exhaust manifolds in the Mirage and revised engine mounts in the ASX-and from 2012 the facelifted Colt adopted updated piston rings, creating minor service part distinctions. Partnerships allowed Renault's Twingo and Clio to use a detuned variant. All adaptations are documented in OEM technical bulletins.
The 3A91's primary reliability risk is excessive oil consumption in early builds (2008–2011), with elevated incidence in high-mileage or short-trip urban use. Mitsubishi internal quality data from 2013 indicated up to 12% of pre-2012 engines exceeded 0.5 L/1,000 km consumption, while EU type-approval testing confirmed revised pistons reduced this to <2% in post-2012 units. Extended oil change intervals and low-quality oil accelerate ring coking, making oil specification and interval adherence critical.
Analysis derived from Mitsubishi technical bulletins (2009–2015) and EU type-approval failure statistics (2010–2020). Repair procedures should follow manufacturer guidelines.
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The 3A91 is generally reliable if maintained properly, but early models (2008–2011) had oil consumption issues. Post-2012 revisions resolved this with updated pistons. Regular oil changes with correct 5W-30 oil and timely service greatly improve longevity and prevent common failures.
Key issues include excessive oil consumption (early builds), timing chain tensioner wear from poor oil maintenance, throttle body carbon buildup, and coolant leaks from the thermostat housing. These are documented in Mitsubishi service bulletins SB‑09‑12‑003 and related TIS entries.
The 3A91 powered the Mitsubishi Colt (2008–2012), Mirage (2012–2017), and select European ASX models (2010–2013). It was also licensed to Renault for the Twingo III and Clio IV (2012–2019) as the SCe 75 1.2L petrol engine.
Limited tuning potential due to small displacement and naturally aspirated design. ECU remaps yield modest gains (+3–5 kW), but require careful calibration. Forced induction is not recommended without extensive internal modifications. Most owners prioritize fuel economy over power.
Excellent for city use. In a Mirage (2013), typical consumption is ~5.8 L/100km (city) and ~4.3 L/100km (highway), or about 55 mpg UK combined. Real-world mixed driving typically returns 50–60 mpg (UK) when maintained properly.
Yes. The 3A91 is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause severe internal damage. However, the chain is designed for life-of-engine service if correct oil and intervals are maintained.
Mitsubishi specifies SAE 5W-30 oil meeting API SN/ILSAC GF-5 (or ACEA A5/B5). Always use a quality low-SAPS synthetic and change every 10,000 km or 12 months to protect the timing system and minimize oil consumption.
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