Tomioka Racing Premium Mitsubishi 4B11 2.2L Stroker Kit (900+ HP)

Turn your Evo X into a 2.2L torque monster. The Tomioka Racing Premium 4B11 Stroker Kit combines a 94 mm billet crankshaft, forged 2618 pistons, 4340 H-beam rods, and race bearings into a proven rotating assembly engineered for 900+ horsepower high-boost builds.

Turn Your 4B11 Into a 2.2L Animal

If you’ve reached the limits of the stock 4B11 bottom end, this is the next step. Using the factory 4B11 block, this kit stretches stroke to 94 mm and increases displacement to 2.2L, while maintaining a 9.0:1 compression ratio – the sweet spot for aggressive turbo setups on pump gas or E85.

With proper block preparation, clearancing, dynamic balancing, oiling upgrades, and a safe tune, this forged rotating assembly is engineered to support 900+ HP and extended high-RPM use in well-built race or high-power street engines.

Forged Components for High Boost

• Billet 4340 crankshaft – 94 mm stroke
  Increases displacement and torque while maintaining strength for high boost. Billet construction provides superior rigidity and durability under heavy load.
• Forged 4340 H-beam connecting rods – 143.66 mm
  H-beam profile offers an excellent strength-to-weight ratio and stability at elevated RPM and high horsepower levels.
• Forged 2618 aluminum pistons – 9.0:1 compression
  2618 alloy is chosen for extreme cylinder pressure and high-boost conditions. The 9.0:1 compression ratio is optimized for turbocharged 4B11 builds on modern fuels.
• Competition race bearings (main & rod)
  Bearing sets selected to support high load and sustained high RPM usage, completing a ready-to-build performance rotating assembly.

Power & RPM Guidance

This kit is designed for serious engine builds and should be paired with professional machine work and tuning.

• Target capability: Engineered for 900+ HP with the correct turbo system, fuel system, headwork, and engine management.
• Use case: Ideal for big-turbo street, time-attack, drag, and roll-racing Evo X builds where reliability under power matters.

To achieve these power levels safely, we strongly recommend:

• Professional block machining and assembly
• Proper piston-to-wall, bearing, and ring clearances
• Dynamic balancing of the rotating assembly
• Upgraded oiling and cooling systems
• Conservative, knock-safe tuning

Key Features

• 2.2L displacement using the factory 4B11 engine block for major torque gains and faster spool
• Engineered for 900+ HP high-boost Evo X builds (with proper supporting mods)
• 94 mm billet crankshaft for increased stroke and strength
• Forged 2618 pistons with 9.0:1 compression ratio for turbocharged pump gas and E85 setups
• Forged 4340 H-beam rods (143.66 mm) optimized for high power and high RPM stability
• Race main and rod bearings included for a complete rotating assembly
• Available in 86.0 mm (standard) and 86.5 mm (+0.5 mm) bore sizes for fresh or overbore builds

Technical Specifications

• Compression Ratio: 9.0 : 1
• Stroke: 94 mm
• Rod Length: 143.66 mm
• Crankshaft: Billet 4340
• Pistons: Forged 2618 aluminum
• Bearings: Race / competition (main & rod)

Stroker Kit Variants

• TR-ES2027
  Bore Size: 86.0 mm (standard)
  Stroke: 94 mm
  Rod Length: 143.66 mm
  Compression Distance: 29.33 mm
  Compression Ratio: 9.0 : 1
• TR-ES2028
  Bore Size: 86.5 mm (+0.5 mm)
  Stroke: 94 mm
  Rod Length: 143.66 mm
  Compression Distance: 29.33 mm
  Compression Ratio: 9.0 : 1

Kit Contents

• Billet crankshaft (94 mm stroke)
• H-beam connecting rod set (143.66 mm)
• Forged piston set (2618, 9.0:1) with rings, pins, and locks
• Race main bearing set
• Race connecting rod bearing set