It was the first car in Japan with a horizontally opposed engine.

To meet the engine requirement, a horizontally opposed 12-cylinder design was used.

The Model 8 used the new horizontally opposed small engines that had just been developed by the engine manufacturers.

All are powered by a new 148-horsepower 2.0-liter horizontally opposed "boxer" 4-cylinder engine.

But like that engine, it is horizontally opposed, or "flat," an anomaly for a family car.

The Franklin 2 series of 2-cylinder air-cooled horizontally opposed aircraft engines were produced in the 1930s and 40s.

The R series are built around a horizontally opposed flat-twin (boxer) engine.

Power was provided by a small two-cylinder, horizontally opposed, air-cooled engine.

The engine designation means horizontally opposed 63 cubic inch displacement.

All use a 2.5-liter horizontally opposed "boxer" 4-cylinder engine.