The Mitsubishi 4B11 is a 1,998 cc, inline‑four naturally aspirated petrol engine produced between 2007 and 2017. It features dual overhead camshafts (DOHC), 16 valves, and Mitsubishi’s MIVEC variable valve timing on both intake and exhaust camshafts. In standard form it delivered 107–121 kW (145–165 PS) with torque between 198–201 Nm, providing responsive mid‑range power for compact and performance applications.
Fitted to models such as the Lancer (CY/CS), Lancer E…
Production years 2007–2010 meet Euro 4 standards; 2011–2017 models meet Euro 5 depending on market (Japan Automobile Manufacturers Association Type Approval #JAMA/4B11/2011).
The Mitsubishi 4B11 is a 1,998 cc inline‑four naturally aspirated petrol engine engineered for compact sedans and performance variants (2007–2017). It combines DOHC architecture with MIVEC variable valve timing on both camshafts to deliver responsive mid‑range torque and smooth high‑rpm power. Designed to meet Euro 4 (and later Euro 5) standards, it balances sporty character with daily usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 107–121 kW (145–165 PS) | |
Torque | 198–201 Nm @ 4,000 rpm | |
Fuel system | Sequential multi‑point fuel injection (SFI) | |
Emissions standard | Euro 4 (2007–2010); Euro 5 (2011–2017) | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None (naturally aspirated variants) | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Mitsubishi Genuine 5W‑30 (API SN/ILSAC GF‑5) | |
Dry weight | 128 kg |
The Mitsubishi 4B11 was used across Mitsubishi's CY/CS/CZ4A/CW/CE platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts and oil cooler in the Lancer Evolution X and simplified MIVEC calibration in the Outlander—and from 2011 the facelifted Lancer models adopted updated emissions hardware, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
The 4B11's primary reliability risk is MIVEC solenoid failure in early Evolution X and high-mileage Lancers, with elevated incidence in hot climates and track use. Mitsubishi internal field data (2011) indicated ~18% of 2008–2009 Evolution X units required solenoid replacement before 80,000 km, while EU service networks reported increased MIVEC-related DTCs in vehicles using non-spec oil. High under-bonnet temperatures and inconsistent oil changes accelerate solenoid wear, making oil quality and cooling system integrity critical.
Analysis derived from Mitsubishi technical bulletins (2008–2016) and EU national vehicle inspection data (2015–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, with proper maintenance. The 4B11 is robust and non-interference, with strong internals. Early Evolution X models (2008–2009) had MIVEC solenoid issues, resolved by 2010. Regular oil changes with 5W-30 API SN oil and avoiding excessive idling ensure longevity beyond 250,000 km.
MIVEC solenoid failure (early Evo X), oil consumption in high-mileage engines, carbon buildup on intake valves, and rare timing tensioner wear. Most issues are preventable with correct oil and service intervals. Documented in Mitsubishi TSBs ENG‑09‑012 and ECU‑11‑003.
The 4B11 powered the Lancer (2007–2017), Lancer Evolution X (2007–2016), Outlander (2007–2012), and ASX/RVR (2010–2015). All are 2.0L petrol variants. Note: the turbocharged 4B11T is a derivative but shares core architecture. No cross-manufacturer licensing occurred.
Yes, especially the naturally aspirated version. Bolt-on cams, headers, and ECU remaps can yield +15–25 kW. The block is strong, but head gasket and fuel system upgrades are recommended beyond 150 kW. Tuning should use 98 RON fuel and retain MIVEC functionality for drivability.
In a Lancer 2.0L (121 kW), expect ~8.2 L/100km city and ~5.9 L/100km highway, or ~38 mpg UK combined. Outlander models average 9.0 L/100km due to weight. Real-world mixed driving typically yields 35–42 mpg UK. Economy suffers if MIVEC is disabled or carbon buildup occurs.
No. The 4B11 is a non-interference engine. If the timing chain fails, pistons will not contact valves, preventing catastrophic internal damage. This enhances long-term reliability, though timing components should still be inspected at high mileage.
Mitsubishi specifies 5W-30 synthetic oil meeting API SN or ILSAC GF-5 standards. ACEA A5/B5 is acceptable. Change every 10,000 km or 12 months. Correct oil is critical for MIVEC solenoid function and preventing sludge in high-heat applications.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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