After three decades of production, the Subaru EJ20 engine is coming to an end. To mark the occasion, Subaru has released a video of how they assemble the boxer four that has powered everything from speed record Legacys to S-series WRX STIs. With white-gloved technicians at every step, it’s a process that is both mesmerizing and very satisfying to watch.
Building an engine sure seems easy when you have machines that can tighten several fasteners simultaneously, or dispense exactly the right amount of sealant every time. Also, having various stands orienting the engine in the optimal position sure beats a grimy piece of cardboard on your driveway.
For the closing run of EJ20s, which will go into 555 WRX STI EJ20 Final Edition cars, Subaru will balance the engine internals and crankshaft. With significantly stricter tolerances, it should be the most precise version of the engine ever made for a non-race application. It’s a fitting send-off for an engine that has served for so long.