The Boxer engine of the Japanese company Subaru turns 50 and reaches 16 million units produced. This engine was introduced on May 14, 1966 in its compact Subaru 1000 model and this first version, called EA, cubed 1.000 cc and offered 55 HP of power.
All current Subaru models are equipped with longitudinal engines with opposite cylinders, both gasoline and diesel, which vary from the 114 HP of the naturally aspirated 1.6 equipped in the access version of the Subaru XV, to the 300 HP of the 2.5 turbocharged that equips the WRX STI, and which it uses the Subaru Tecnica International racing team, with hardly any modifications, on the Nurburgring 24 hours.
In Subaru's horizontal cylinder engine, the pistons are symmetrically located in two opposing cylinder heads with two pistons each, mutually canceling their inertia and resulting in less vibration, rotational balance, and a smooth, sporty feel throughout. the range of revolutions, says the firm.
The flat and low profile of the engine also reduces the height of the center of gravity, improving stability and handling even in 4 × 4 vehicles, whose touch and feel at the wheel resemble a passenger car.
Subaru is the only brand in the world that uses the boxer configuration applied not only to its gasoline engines, but also to diesel, the development of which began in 1999.
The first generation of the diesel boxer saw the light in 2008 and was “a real revolution” thanks to its compact size, low weight, high rigidity and the use of a short-stroke block (86x86mm).
Today's Subarus use the fifth evolution of the two-liter engine whose noise and vibration levels are “inherently low” without the need for counter-rotating shafts as is common in in-line or V engines.
The Boxer engine is one of the main elements that is part of the symmetrical transmission system Symmetrical All-Wheel Drive that offers a combination of stability and traction and a balanced weight distribution as a result of the symmetry of the transmission system joined longitudinally to the Boxer engine.
This combination allows all Subaru to offer excellent high-speed stability and cornering precision.