That means it's got a horizontally opposed boxer engine and all-wheel drive.

Its horizontally opposed six-cylinder engine adds character with wonderful aural accompaniment.

The Barnwell monoplane was the first Scottish machine to fly; it had a horizontally opposed Scottish engine.

The bike uses a version of the 1832-cc horizontally opposed six-cylinder powerplant from Honda's big Gold Wing touring bike.

Subaru will introduce the world's first turbo diesel engine with horizontally opposed pistons at the Geneva International Motor Show next month.

They too feature a high-revving 4.0-litre, horizontally opposed 6-cylinder motor initially only in 6-speed manual guise.

As with all Subarus running horizontally opposed 4-cylinder engines and continuously variable transmissions, the drivetrain can be noisy even under light acceleration.

The company's unusual horizontally opposed cylinder configuration has the benefit of radically reducing any Subaru's centre-of-gravity and improving stability, especially on its SUVs.

Because the cylinders are arranged in two horizontally opposed banks, a flat-four is relatively wider and substantially lower than a stand-up, conventional inline-four.