Flat engine
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A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the
Benz Contramotor, the first commercial flat-engine design, ca. 1899
1954 BMW R68 flat-twin boxer engine
World War II-era Riedel starter motor
1969 Hino Motors DS140 boxer-twelve diesel engine
Flat-twelve engine
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A flat-twelve engine is a twelve-cylinder piston engine with six cylinders on each side of a central crankshaft.
Flat engine
…Flat-ten engines are not known to have reached production. A prototype road car engine was built by Chevrolet in the 1960s. Flat-twelve engines have been used in various racing cars, notably the Porsche 917K, during the 1960s and 1970s, and in Ferrari road cars from 1973 to 1996. The Panhard…
1984–1991 Ferrari Testarossa mid-mounted engine