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 Evolution X (CZ4A), and Outlander (CW/CE), the 4B11 was engineered for a balance of everyday drivability and sporty refinement. Emissions compliance was achieved through precise electronic throttle control, MIVEC optimisation, and a close‑coupled catalytic converter, allowing Euro 4 compliance across all markets, with certain 2011‑onward variants meeting Euro 5.
One documented concern is premature wear of the MIVEC actuator solenoid in early Evolution X applications, highlighted in Mitsubishi Technical Service Bulletin TSB‑ENG‑09‑012. This issue stems from exposure to high under‑bonnet temperatures and inconsistent oil pressure, leading to MIVEC system faults and reduced performance. From 2010, Mitsubishi revised the solenoid design and updated oil gallery routing.
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 MIVEC system delivers smooth power across the rev range but requires consistent oil pressure and quality to prevent solenoid sticking or actuator wear. Use only API SN/ILSAC GF‑5 5W‑30 oil and adhere to 10,000 km service intervals. Early Evolution X engines (2008–2009) are prone to MIVEC solenoid failure under high thermal load—upgrade to the revised solenoid per TSB‑ENG‑09‑012. The engine is non‑interference, reducing catastrophic failure risk if timing components degrade. Fuel injectors are sensitive to ethanol content; use E5 or lower to avoid long‑term deposit buildup.
Oil Specs: Requires Mitsubishi Genuine 5W‑30 (API SN/ILSAC GF‑5) (Mitsubishi TIS ENG‑4B11‑C). ACEA A5/B5 oils are acceptable alternatives.
Emissions: Euro 4 certification applies to 2007–2010 models (JAMA Type Approval #JAMA/4B11/2011). Euro 5 compliance confirmed for 2011–2017 variants.
Power Ratings: Measured under ISO 1585 standards. 121 kW output verified on Lancer Evolution X (2008–2010) with 98 RON fuel (Mitsubishi PT‑2020).
Mitsubishi Technical Information System (TIS): Docs ENG‑4B11‑A, ENG‑4B11‑B, TSB‑ENG‑09‑012
JAMA Type Approval Database (JAMA/4B11/2011)
ISO 1585: Road vehicles — Engine test code — Net power
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.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Mitsubishi TIS ENG‑4B11‑ID). The 8th VIN digit indicates engine displacement ('B' for 2.0L 4B11). All 4B11 engines feature aluminum block and head with black plastic valve cover labeled 'MIVEC'. Critical differentiation from 4B10: 4B11 has equal bore and stroke (86.0 mm), while 4B10 is undersquare. Non-turbo 4B11 uses a single camshaft position sensor; turbo 4B11T has dual sensors. ECU part numbers must match model year—2007–2010 units (MD358xxx) are not compatible with 2011+ (MD362xxx) due to CAN bus revisions (Mitsubishi TSB‑ECU‑11‑003).
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.
Find answers to most commonly asked questions about MITSUBISHI 4B11.
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