Unraveling the Engineering Behind Subaru's EJ205 Engine

Jul 23, 2023

Unraveling the Engineering Behind Subaru's EJ205 Engine

Subaru's EJ series engines have always been popular in Japanese car circles, and there are tons of good reasons why they are! This compact but powerful engine can dish out unexpected performance for its rather modest size.

Subaru is a well-known Japanese automobile manufacturer and is highly regarded for its engines. Among the many engines produced by Subaru, the EJ205 engine is highly esteemed by car enthusiasts. Its exceptional performance, advanced technology, and durability are some of the reasons why the EJ205 engine is so popular among Subaru enthusiasts. In this article, we will explore the engineering behind Subaru's EJ205 engine and understand why it is such a remarkable piece of engineering.

One of the very things that strike one's eye with this engine is its small size. EJ205 is rather compact compared to its brethren, but has no shortcomings when it comes to performance!

The EJ205 engine is a relatively small but powerful engine that packs a punch. It is a turbocharged, horizontally opposed, four-cylinder, and 16-valve engine with a total displacement of 2.0 liters. The engine's quick-boost turbocharger system allows it to attain maximum horsepower and torque at low speeds, making it an excellent engine for performance cars and racing sports.

Not every EJ205 variant has AVCS (like this one) but most come equipped with one, and for a good reason! AVCS improves the overall engine health and fuel efficency.

The EJ205 engine features Subaru's signature technology, the Subaru Active Valve Control System (AVCS). This technology enhances the engine's performance by continuously adjusting the intake and exhaust valve timing to optimize combustion and improve fuel efficiency. The combination of the engine's design and the technology installed makes the EJ205 a very reliable engine.

Material quality of EJ205 is top-notch, as expected from a Subaru product. Though that's not all, EJ205 also has unique engine block design to improve the overall thermal conductivity.

The EJ205 engine has a significant number of engineering features that make it superior to other engines of its class. The engine has high-strength steel crankshafts that improve its durability and make it more rugged. Also, the engine block has a semi-closed design that allows for better thermal conductivity and ensures tighter sealing of the cylinder liners.

EJ205 not only performs good in terms of horsepower and torque, but provides a smooth riding experience for the driver. Like most Subaru engines, EJ205 has specialized engineering to reduce extreme engine  vibration under heavier loads.

The pistons in the EJ205 engine come with a unique design that reduces the amount of noise and vibration produced by the engine. This design not only minimizes noise pollution but also protects the engine from excessive wear and tear. The engine also features a specially designed Intercooler that provides an efficient cooling system, which aids in optimizing performance and efficiency.



The EJ205 engine's engineering has earned it many accolades and has made it one of the most robust and reliable engines in the automotive world. The engine has proven itself time and time again under different circumstances, be it overtaking other cars or driving in challenging terrain. Its design ensures that it provides a perfect balance between power and efficiency.



In conclusion, the engineering behind Subaru's EJ205 engine is intriguing. The design elements that Subaru uses when creating its engines are critical to their overall success. With the EJ205 engine, the company has managed to create a high-performance engine that remains one of the most dependable engines in the world. The advanced technology installed in the engine highlights its robust design, making it suitable for use in various applications. With its superior features and qualities, one can undoubtedly understand why the EJ205 engine is held in such high regard by Subaru car enthusiasts. Check out our stock of genuine JDM EJ205 engines to upgrade your Subaru!