However, it had a short run and was only used in Legacy Outback for the 20 model years. The EJ252 was another version used alongside the EJ251. Quite a few reliability concerns popped along, ranging from head gasket failures to fluid leaks, prompting Subaru to replace the engine with a new version in many of its models. However, it wasn’t smooth sailing for the EJ251. It ran a 10:1 compression ratio and puts out 165 hp and 167 lb-ft of torque. The EJ251 powered a lot of cars and was the first of the SOHC engines to be used by Subaru in the American market. However, it’s worth pointing out that multiple versions of the EJ25 are available in both naturally aspirated and turbocharged configurations, just like their 2.5l H4 engine.Įarly naturally aspirated engines ran a 9.5:1 compression, while turbocharged EJ25s ran 8.0:1, eventually pushing those numbers to 10:1 and 9.5:1, respectively. EJ25 engine blocks have cast-iron sleeves, SOHC/DOHC aluminum heads, and belt-driven camshafts.
As for the weight, the EJ25 phase 1 reportedly weighs just under 300 pounds.Įvery EJ25 up to 2004 was an open deck engine, with semi-closed versions being introduced later on. You get a 2,457cc engine, four valves per cylinder with 99.5 mm bore and 79 mm stroke. The four-cylinder boxer engine came with all-aluminum everything, from the cylinder block to the heads. The EJ25 started its life around 1996 as an open deck engine that made 155 hp and 140 lb-ft of torque. Subaru EJ25: Engine SpecsĮngine code: EJ25D, EJ251,EJ252, EJ253, EJ254, EJ255, EJ257įuel s ystem: Electronic Fuel Injection/Sequential Multi-point FIĬompression ratio: 9.5:1 – 10:1 (naturally aspirated), 8.0:1 – 9.5:1 (turbo)īelonging to the EJ family of engines, the EJ25 shares most of its layout and internals with other popular engines like the EJ20 and EJ22T. More specifically the specs, various iterations, and reliability.
In this article, we’ll be diving deep and discussing all things EJ25. These inline-four engines were later given various updates to improve fuel economy and stay in line with the emissions regulations. The 2.5 l unit came in several states of tune, with each engine offering better performance and efficiency. The EJ25 was developed with learnings from the EJ20 and EJ22. Later it was followed by the EJ20: a 120-hp SOHC motor, and the EJ22: a 135-hp engine with similar valvetrain architecture.
#2005 subaru jdm ej254 dohc parts series
The EJ series started with the EJ15 a single overhead cam (SOHC) that made around 90 hp, and then the EJ16, yet another SOHC engine. Subaru’s EJ25 was part of the company’s transition from the old and aging EA series engines.Īvailable in naturally aspirated and turbocharged form, the EJ25 can be seen in a variety of cars ranging from the Legacy and Forester to the Impreza and the ever-popular WRX STI.Īll EJ engines share a similar construction and they all have 16 valves.
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