Inline engine
reciprocating engine arranged with cylinders in banks aligned with the crankshaft
Walter Major
straight-six
W engine
straight-five
U engine
straight-four engine
straight-twin
straight-ten
straight-14
straight-eight
Walter Minor
straight-three
Mercedes D.II
Alfa Romeo 115
Mercedes D.I
straight-nine
2si 460
2si 540
2si 808
Benz Bz.II
straight-twelve
straight-seven
Austro-Daimler 6
Benz Bz.III