Mitsubishi 4B10 Engine

I. Core Specifications (Standard Version)

• Model: 4B10
• Displacement: 1798 cc (1.8L)
• Configuration: Inline-four cylinders, DOHC, 16 valves
• Bore × Stroke: 86.0 mm × 77.4 mm (short-stroke/high-rev oriented)
• Compression Ratio: 10.5:1
• Maximum Power: 100–105 kW (136–143 PS / 134–141 hp) @ 6000 rpm
• Maximum Torque: 175–177 N·m (129–131 lb·ft) @ 4250 rpm
• Material: All-aluminum cylinder block + cylinder head (with cast iron liners)
• Valve Train: Dual MIVEC continuous variable valve timing (intake & exhaust)
• Fuel System: ECI multi-point fuel injection
• Recommended Fuel: Unleaded gasoline 92# and above

II. Key Technical Features

1. All-aluminum construction: Approximately 30% lighter than cast-iron engines, with better heat dissipation, lower fuel consumption and less vibration.
2. Dual MIVEC variable valve timing: Continuously and electronically adjustable timing for both intake and exhaust camshafts, balancing low-end torque and high-end power while improving fuel economy.
3. Timing chain: Maintenance-free for life with higher reliability.
4. Roller rocker arms + hydraulic lifters: Low friction, low noise and automatic valve lash adjustment.

III. Equipped Models

• Mitsubishi Lancer 1.8L (2007–2017)
• Mitsubishi RVR/ASX (1.8L version in Japan and select markets)
• Mitsubishi Galant Fortis
• Proton Inspira (Malaysia, 2010–2015)

IV. Performance & Characteristics

• Advantages: Smooth and quiet, good high-rev response; advanced technology for its era; reliable with moderate modification potential; favorable daily fuel consumption (combined 7–8 L/100km).
• Disadvantages: Average low-end torque.