Horizontally opposed engine

What is the ideal engine for the greatest driving pleasure? Subaru believes that the answer is the Horizontally-Opposed Engine. This engine, with a layout that positions the pistons laterally to the crankshaft at an angle of 180 degrees, delivers multiple benefits. Why is this Horizontally-Opposed Engine the ideal power unit? Because the opposed pistons mutually counteract vibration and give superior balance. This results in smoother engine performance throughout all speed ranges - with no need for a balancer shaft - as well as giving unparalleled response to the driver.The next advantages are the size and weight. Obviously, the Horizontally-Opposed piston layout means an engine that is both shorter and lower than a conventional in-line design. In addition, you have a more compact shape, lighter weight and the ability to mount the engine much lower in the chassis. The overall result is a low centre of gravity and balance that cannot be matched with other engine types. The Horizontally-Opposed Engine has so many features that mere words can't adequately describe the difference it makes. You could even say that this engine is the one factor that really makes Subaru AWD possible.

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