Subaru EJ engine - Wikipedia The Subaru EJ engine is a series of four-stroke automotive engines manufactured by Subaru. They were introduced in 1989, intended to succeed the previous Subaru EA engineConfiguration: Flat-fourCylinder bore: 85 mm (3 in), 87.9 mm (3 in), 92 mm (3 in), 96.9 mm (3 in), 99.5 mm (3 in)Manufacturer: SubaruProduction: 1988 – presentEJ15EJ16EJ18EJ20EJ22EJ25 Subaru Boxer Engine Diagram | My Wiring DIagram Subaru Boxer Engine Diagram . Subaru Boxer Engine Diagram . How Boxer Engines Work Super Street Magazine. How to Set Timing Timing Belt Change On A Subaru sohc Ej25.