Subaru first started using the boxer engine back in 1965 with the introduction of the Subaru 1000. Half a century later, Subaru is still using the boxer engine. In fact, the horizontally opposed boxer engine is used in every single vehicle in the Subaru lineup.
Needless to say, a lot has changed over the course of 50 years. While the pistons are still horizontally opposed, the 55 horsepower boxer engine that Subaru first used in the 1000 is much different from the boxer engines that are used in Subarus today.
As technology and materials become more advanced and sophisticated, Subaru is able to continue to improve upon the boxer engine. Over the years, the boxer has become more efficient, more powerful, and more durable.
The 2015 Subaru Legacy boasts the newest edition of Subaru’s boxer engine, and the Boxer 4 is the best yet.
The Boxer 4 engine now incorporates Tumble Generator Valves. These valves remain open or partially closed depending on the engine speed to increase efficiency. At lower engine speeds the valves stay partially closed to facilitate ignition and combustion. The valves stay completely open at high speeds to let in as much air as possible.
Subaru continues to increase the compression ratio of the boxer engine, which translates into increased power. Fortunately the increase in power hasn’t led to an increase in friction. In fact, the Subaru Boxer 4 engine is coated in a “low-friction, anti-wear” solution that reduces friction and increases longevity. The opposed position of the pistons in the boxer engine naturally cancels out engine vibrations, which also promotes longevity in a Subaru.
Another advantage of the boxer engine is the symmetrical design and low center of gravity, which results in better balance in a Subaru. Better balance leads to better handling, which leads to a better driving experience.
The new Boxer 4 engine also offers increased gas mileage and lower exhaust emissions.
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