Subaru FB engine

The Subaru FB engine is the third and current generation of gasoline boxer-4 engine used in Subaru automobiles, and was announced on 23 September 2010. It follows the previous generation EJ-series engine which was introduced in 1989 and the first generation EA-series which was introduced in 1966. By increasing piston stroke and decreasing piston bore, Subaru aimed to reduce emissions and improve fuel economy, while increasing and broadening torque output compared to the EJ-series.

Subaru FB engine
Overview
ManufacturerSubaru
Production2010–present
Layout
ConfigurationFlat-4
Displacement
  • 1.6 L (1,599 cc)
  • 2.0 L (1,995 cc)
  • 2.5 L (2,498 cc)
Cylinder bore
  • 78.8 mm (3.10 in) (FB16)
  • 84 mm (3.31 in) (FB20)
  • 94 mm (3.7 in) (FB25)
Piston stroke
  • 82 mm (3.23 in) (FB16)
  • 90 mm (3.54 in) (FB20 & FB25)
ValvetrainDOHC 4 valves x cyl. with AVCS
Compression ratio10.5:1, 11.0:1, 12.5:1
Combustion
TurbochargerOptional
Fuel systemFuel injection
Fuel typeGasoline
Cooling systemWater-cooled
Output
Power output84–136 kW (114–185 PS; 113–182 hp)
Torque output15.3–25.5 kg⋅m (150–250 N⋅m; 111–184 lbf⋅ft)
Chronology
PredecessorEJ
SuccessorFA, CB

The Subaru FA engine series was derived later from the FB, but the two engine families share only a few common parts. In 2020, Subaru introduced the CB18 engine with improved efficiency to succeed the FB in several applications.

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