page_title: List of Subaru engines
section_title: Subaru FB engine
hierarchical_section_title: List of Subaru engines / Four Cylinder / Subaru FB engine
caption_attribution_description: English: Subaru 1.6 DIT
context_page_description: Subaru uses a four or five character code to identify all of their engines.
  The first letter is always E standing for engine
  The second letter is the engine's family.
  Next come two digits indicating the engine's displacement
  The optional fifth character is an identifier to mark revisions,
context_section_description: The FB-series (initially available as naturally-aspirated engines in 2.5 and 2.0 litre displacements) is the first new generation of boxer engine since the EJ-series. Subaru announced details of the FB engine on 23 September 2010. By increasing piston stroke and decreasing piston bore, Subaru aimed to reduce emissions and improve fuel economy, while increasing and broadening torque output over the previous generation engine.
  The FB has an all new block and head featuring dual overhead cams with intake and exhaust variable valve timing (AVCS - Active Valve Control System), and a timing chain that replaced the timing belt. Moving to chain-driven cams allows the valves to be placed at a more narrow angle to each other and shrinks the cylinder bore from 99.5 mm to 94. It results in less unburned fuel during cold start, thereby reducing emissions. Subaru also uses asymmetrical connecting rods like those in EZ36. The FB is only marginally heavier and has similar exterior dimensions compared to an EJ engine of equivalent displacement. In Jan 2011, Car and Driver was told direct injection would be added soon.  In 2019, Direct Injection was added to FB engines used in the 2019 Forester, the 2020 Legacy, and the 2020 Outback.
  Subaru claims a 28-percent reduction in friction losses, mainly due to lighter pistons and connecting rods. The FB has a 10% improvement in fuel economy with the power coming on sooner and the torque band being broader.
  FB16E: 1597 cc DOHC, 2012+ EUDM Subaru Impreza XV 1.6i
  FB16F: 1599 cc DOHC, turbo, 2014+ Subaru Levorg
  FB20B: 1995 cc DOHC, 2011+ JDM Subaru Forester, 2012-2016 Subaru Impreza, and 2012-2017 Subaru XV
  FB20D: 1995 cc DOHC, 2017+ Subaru Impreza, and 2018+ Subaru XV
  FB20X: 1995 cc DOHC, 2014–16 Subaru XV Hybrid
  FB20V: 1995 cc DOHC, 2019+ Subaru XV Hybrid
  FB25B: 2498 cc DOHC, 2011–18 North American Subaru Forester, 2012-2019 North American Subaru Legacy, and 2012-2019 North American Subaru Outback
  FB25D: 2498 cc DOHC, 2019+ North American Subaru Forester, 2020+ North American Subaru Legacy, and 2020+ North American Subaru Outback
caption: Subaru FB16F
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