The Proton Inspira and the Mitsubishi Lancer 10 (Lancer EX) share a close relationship, especially in terms of platform and mechanical components. The 4B11 engine is a key part of that connection.

Here’s a breakdown of the 4B11 engine used in the Lancer 2.0 and Proton Inspira 2.0:

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Engine Overview: Mitsubishi 4B11

• Engine Code: 4B11
• Type: Inline-4, DOHC, 16-valve, MIVEC (Mitsubishi Innovative Valve timing Electronic Control)
• Displacement: 1,998 cc (2.0L)
• Fuel System: Electronic Fuel Injection (EFI)
• Compression Ratio: ~10.0:1
• Bore x Stroke: 86.0 mm x 86.0 mm (square engine design)
• Construction:
  
• Aluminum cylinder block and head (lighter than older iron blocks)
• Timing chain instead of belt (lower long-term maintenance)
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Performance (Stock 4B11 NA version)

• Max Power:
  
• ~150 hp @ 6,000 rpm (varies slightly depending on market tuning)
• 
  
• Max Torque:
  
• ~197 Nm @ 4,200 rpm
• 
  
• Fuel Type: RON95 or higher
• Transmission: CVT (INVECS-III) or 5-speed manual (depending on variant)

Note: The Lancer EX Ralliart and Evo X use a turbocharged version (4B11T) which is significantly more powerful (220–300+ hp).

🧰 Key Features

• MIVEC system: Adjusts intake (and sometimes exhaust) cam timing for better efficiency and performance.
• Chain-driven cams: Reduces maintenance compared to older belt systems.
• Reliable NA platform: Known for smooth power delivery and solid reliability.

🛠️ Proton Inspira 2.0 & Lancer Comparison