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Subaru's EJ20K was a turbocharged, 2.0-litre horizontally-opposed (or 'boxer') four-cylinder petrol engine. In Australia, the EJ20K engine powered the Subaru GC/GM Impreza WRX from November 1996 (for the 1997 'model year' or MY97) to 1998. For the Subaru GC/GM Impreza WRX, key features of the EJ20K engine included:
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For the GD.II/GG.II Impreza WRX, the EJ205 engine had Subaru's 'Active Valve Control System' (AVCS) which adjusted the opening and closing timing of the intake valves by changing the phase angle of the camshaft sprocket relative to the camshaft; for the GD.II/GG.II Impreza WRX, it is understood that the maximum range of adjustment was 35 crankshaft degrees.
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The FA20D engine had an aluminium alloy cylinder head with chain-driven double overhead camshafts. The four valves per cylinder - two intake and two exhaust - were actuated by roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms (which actuated the valves).
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