Exploring the Best Subaru Engine Ever Made

The Heart of Subaru: A Mechanic’s Perspective

When you think of Subaru, the first thing that often comes to mind is their signature all-wheel-drive systems and rugged reliability. But peel back the layers, and you’ll find that the true heart of these vehicles lies in their engines. Subaru has a rich history of engineering that has led to some of the most iconic and beloved engines in the automotive world. As a mechanic who has spent years working on these machines, I can tell you that not all engines are created equal. Some stand out, not just for their performance, but for their engineering prowess and the sheer joy they bring to driving.

Flat-Four: The Boxer Engine

Subaru’s flat-four engine, commonly known as the “boxer” engine, is perhaps one of the most recognizable aspects of their lineup. This engine layout is unique in the automotive world, featuring horizontally opposed cylinders that provide a low center of gravity. This design not only enhances stability but also contributes to the vehicle’s overall handling dynamics.

Why the Boxer Engine Stands Out

-Balance and Smoothness: The opposing pistons cancel out vibrations, resulting in a smoother operation compared to traditional inline or V engines.
-Compact Design: The flat nature of the engine allows for a lower hood line and better aerodynamics, which is crucial for performance and fuel efficiency.
-Sound: Let’s be honest: the distinct growl of a Subaru boxer engine is music to the ears of enthusiasts. It’s a sound that can’t be replicated, and it adds to the driving experience.

Turbocharged Variants: Power Meets Efficiency

Over the years, Subaru has also introduced turbocharged variants of their boxer engines. These engines have been game-changers, especially for models like the WRX and STI, where performance is paramount. The turbocharged boxer engines deliver impressive power and torque, making them a favorite among performance junkies.

Performance Benefits

-Instant Torque: Turbocharging provides a significant boost in low-end torque, making acceleration feel effortless.
-Versatility: Whether you’re tearing up a rally stage or cruising down the highway, these engines offer a broad power band that suits various driving styles.
-Fuel Efficiency: Contrary to what you might think, turbocharged engines can be more fuel-efficient than their naturally aspirated counterparts, especially when driven conservatively.

Legacy Models: Icons of Performance

Subaru has produced several models that have become legends in the automotive community, and their engines have played a crucial role in that legacy. The Subaru Impreza WRX STI, for example, has a dedicated following and is revered for its rally heritage. The engine that powers this beast is a 2.5-liter turbocharged flat-four that produces exhilarating power and a thrilling driving experience.

Notable Engines in Subaru History

• EA Series: The original boxer engines that set the foundation for Subaru’s unique engineering approach.


• EJ Series: A versatile engine family that has powered everything from sedans to SUVs.


• FA Series: A modern turbocharged engine that combines efficiency with performance, found in newer models like the Subaru BRZ.

Challenges and Considerations

While Subaru engines are celebrated for their performance and reliability, they are not without their challenges. Mechanics often encounter specific issues that can arise, particularly with older models. For instance, head gasket failures are a well-documented problem with the EJ series engines, especially in the turbocharged variants.

Common Issues to Watch For

1. Oil Leaks: Common in older models; keep an eye on seals and gaskets.


2. Cooling System: Ensure that the cooling system is in top shape to prevent overheating.


3. Turbo Maintenance: Turbocharged engines require regular maintenance to avoid boost leaks and turbo failure.

Subaru engines have earned their place in automotive history, not just for their innovative design but for the passionate community that surrounds them. Whether you’re a seasoned mechanic or a casual driver, there’s no denying the allure of a well-tuned Subaru engine.

Unpacking the Best of Subaru Engineering

When it comes to Subaru engines, the debate over which is the best can ignite passionate conversations among enthusiasts and mechanics alike. With a legacy that spans decades, Subaru has produced a variety of engines that cater to different needs, from everyday commuting to high-performance racing. Let’s dive into the specifics of what makes certain Subaru engines stand out from the rest.

Defining the Best Subaru Engine

To determine the best Subaru engine, we must consider several factors, including performance, reliability, and the overall driving experience. Here’s a breakdown of the key elements that make an engine truly exceptional:

• Power Output: The engine must deliver impressive horsepower and torque.


• Durability: Long-lasting engines that can withstand the test of time and rigorous driving conditions.


• Tuning Potential: An engine that can be easily modified for increased performance.


• Driving Experience: The engine’s sound, responsiveness, and overall feel behind the wheel.

Top Contenders for the Title

Several Subaru engines have made a mark in automotive history, but a few stand out as the best. Here’s a closer look at those engines:

Highlighting the EJ Series

The EJ series has been a staple in Subaru’s lineup for years, with the EJ20 and EJ25 often cited as the best engines Subaru has ever produced. Here’s why:

• Performance: The turbocharged variants are known for their robust power delivery, making them ideal for high-performance models like the WRX and STI.


• Tuning Community: The EJ engines have a massive aftermarket support, allowing enthusiasts to push the limits of performance.


• Rally Heritage: These engines have a rich history in motorsport, particularly in rally racing, which adds to their allure.

The FA and FB Series: A Modern Take

As Subaru evolved, so did their engine technology. The FA and FB series engines represent a shift towards more efficient and modern designs. Here’s what makes them noteworthy:

1. Fuel Efficiency: These engines are designed with efficiency in mind, offering better fuel economy without sacrificing performance.


2. Modern Engineering: Incorporating technologies like direct fuel injection, these engines provide a smoother and more responsive driving experience.


3. Broader Applications: Found in a variety of models, these engines cater to both performance enthusiasts and everyday drivers.

Challenges and Considerations

While Subaru engines are revered, they are not immune to issues. Here are some common challenges mechanics face:

• Head Gasket Failures: Particularly in older EJ models, this is a common issue that can lead to significant engine problems.


• Oil Consumption: Some engines, especially the FA series, have been known to consume oil at a higher rate than expected.


• Turbo Maintenance: Turbocharged engines require extra care, and neglecting maintenance can lead to costly repairs.

Subaru engines have carved out a niche in the automotive world, combining performance, reliability, and a unique driving experience. Whether you’re a mechanic working on these engines or an enthusiast behind the wheel, there’s no denying the impact they’ve had on the market.

Validation of Subaru Engine Excellence

The reputation of Subaru engines is not just built on anecdotal evidence; it is supported by various data, awards, and expert opinions. Here’s a closer look at the factors that confirm the excellence of Subaru’s engineering.

Awards and Recognitions

Subaru engines have received numerous accolades in the automotive industry, which further solidifies their standing as some of the best in the market.

Key Awards

• World Rally Championship (WRC): Subaru has won multiple championships, with their EJ series engines playing a crucial role in securing titles in the 1990s and early 2000s.


• Car and Driver 10Best: The Subaru WRX has consistently made it onto this prestigious list, highlighting its performance and engineering excellence.


• Motor Trend’s Best Driver’s Car: The Subaru BRZ, equipped with the FA20 engine, has been recognized for its handling and driving experience, showcasing the potential of Subaru’s modern engine lineup.

Expert Opinions and Reviews

Industry experts and automotive journalists have weighed in on the performance and reliability of Subaru engines, lending credibility to their reputation.

Notable Insights

1. Consumer Reports: This authoritative source ranks Subaru highly in reliability, often citing the robustness of their engines as a key factor.


2. Edmunds: Reviews from Edmunds consistently praise the turbocharged EJ engines for their power and responsiveness, especially in performance-oriented models.


3. Automotive News: Reports indicate that Subaru’s boxer engines are favored for their unique design, which contributes to better weight distribution and handling characteristics.

Performance Data

The performance metrics of Subaru engines further justify their esteemed status in the automotive world.

Performance Metrics

• Horsepower and Torque Ratings: The EJ25 engine in the WRX STI produces up to 300 horsepower and 300 lb-ft of torque, making it a formidable competitor in its class.


• Fuel Efficiency: The FA series engines have been noted for their improved fuel efficiency, with some models achieving up to 30 MPG on the highway, a significant feat for performance-oriented vehicles.


• Durability Tests: Subaru engines undergo rigorous testing, including extreme temperature and stress tests, ensuring they can handle demanding conditions.

Subaru’s commitment to engineering excellence is backed by awards, expert reviews, and impressive performance data, confirming their engines’ status as some of the best in the automotive industry.