The second-gen was designed to run on a lower 87 octane fuel and offered in either automatic or manual transmission.ĭue to its DOHC valve design, the spark plugs are much more difficult to service than the SOHC variant. In 1997, the first generation EJ25D was revised, and Subaru introduced the use of shimmed bucket lifters for the heads instead of the HLAs. This version used HLA heads has lower power and torque ratings than the later 1997 – 1999 EJ25D it was recommended to run only on 91 octane fuel and was only made available with an automatic transmission.
The first-generation EJ25Ds were introduced in 1996 as part of the Legacy 2.5 GT, Legacy Outback, and LSi. It has DOHC aluminum heads with four valves per cylinder, two for both intake and exhaust valves. The earliest and first generation of EJ25 engine, EJ25D, has two variations sold in the United States market. 7 mm.Ĭonnecting rods length stands the same at 130.5 mm as well as the cylinder block deck height. He difference is evident between the EJ20 and EJ25 since the latter has a bigger cylinder bore from 92 mm to 99.5 mm, a longer piston stroke from 75 mm to 79 mm, and a lower compression height from 30.7 to 32. The EJ25 engine used the same aluminum cylinder block with dry cast-iron sleeves applied to the EJ20 engine.T Valvetrain: SOHC two valves per cylinder and DOHC four valves per cylinder.Up until this day, EJ25 engines are commonly swapped and tuned due to their potential and strong internals. This EJ25 engine that we encounter today started becoming famous since the first Impreza WRX STI (GDB Chassis) was sold in the United States came with these engines in the mid-2000s. For this case, EJ family and 2.5 Liter displacement.Īnyway, to proceed, EJ25 is a flat-four boxer engine that started its production in 1989, but Subaru materialized it in the middle of 1996 with the naturally-aspirated version having been launched for the Subaru Legacy here in the United States. If you’re confused about the jargon or engine codes, the first two letters are the engine family, and the succeeding numbers are the engine’s displacement. It is the most widely used and largest engine among other EJ family members – EJ15, EJ16, EJ18, EJ20, and EJ22, having a displacement of 2.5 Liters. The Subaru EJ25 is a 2.5 Liter engine manufactured by Subaru in Gunma Oizumi Plant and one of the members of the EJ series. Let’s get right to it! What are Subaru EJ25 Engines? Join me to discuss the engine’s design, applications, issues, reliability, and many more. In the succeeding years of its development, EJ engines became the mainstay engine of Subaru on most of its vehicles.Īnd today, we will talk about the largest engine in the EJ family, the EJ25 engine. Subaru made their way onto the streets introducing EJ engines. They were brought to us by the automotive company that once a division of Fuji Heavy Industries became internationally recognized for their boxer engines.
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