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A flat-twin is a two cylinder internal combustion engine with the cylinders arranged on opposite sides of the crankshaft. It is part of the class of flat engines, sub-type "boxer", and shares most characteristics of those engines.

Automotive useEdit

Flat-twin engines were used in several economy cars, including the Citroën 2CV, the Panhard Dyna X and Dyna Z, Steyr-Puch 500, DAF Daffodil, BMW 600, several Jowett cars between World Wars I and II, and the Toyota Publica and Toyota Sport 800.

See AlsoEdit

Piston engine configurations
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Type BourkeControlled combustionDelticOrbitalPistonPistonless (Wankel) •
RadialRotarySingleSplit cycleStelzerTschudi
Inline types H · U · Square four · VR · Opposed · X
Stroke cycles Two-stroke cycleFour-stroke cycleSix-stroke cycle
Straight Single · 2 · 3 · 4 · 5 · 6 · 8 · 10 · 12 · 14
Flat 2 · 4 · 6 · 8 · 10 · 12 · 16
V 4 · 5 · 6 · 8 · 10 · 12 · 16 · 20 · 24
W 8 · 12 · 16 · 18
Valves Cylinder head portingCorlissSlideManifoldMultiPistonPoppet
SleeveRotary valveVariable valve timingCamless
Mechanisms CamConnecting rodCrankCrank substituteCrankshaft
Scotch YokeSwashplateRhombic drive
Linkages EvansPeaucellier–LipkinSector straight-lineWatt's (parallel)
Other HemiRecuperatorTurbo-compounding

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