adjective (of an engine) having four horizontal cylinders, two on each side of the crankshaft.
noun a flat-four engine.

English new terms dictionary. 2014.

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  • flat-four — [flatfuʀ; flatfɔʀ] n. m. ÉTYM. D. i (v. 1970 ?); mot angl., de flat « plat », et four « quatre ». → Flat twin. ❖ ♦ Anglic. Moto. Moteur de moto à quatre cylindres disposés à plat …   Encyclopédie Universelle

  • flat four — A four cylinder engine with two cylinders on each side. The left bank of two cylinders is directly opposite the right bank …   Dictionary of automotive terms

  • flat-four — 1. adj. (of an engine) having four horizontal cylinders, two on each side of the crankshaft 2. n. an engine of this type …   Useful english dictionary

  • flat-twin — ● flat twin nom masculin invariable (anglais flat, plat, et twin, jumelé) Type de moteurs dans lesquels les 2 cylindres sont disposés horizontalement et opposés l un à l autre. flat twin [flattwin] n. m. ÉTYM. XXe; mot angl., de flat « plat », et …   Encyclopédie Universelle

  • Flat-4 — A flat 4 or horizontally opposed 4 is a flat engine with four cylinders arranged horizontally in two banks of two cylinders on each side of a central crankcase. The pistons are usually mounted on the crankshaft such that opposing pistons move… …   Wikipedia

  • Flat engine — A flat engine is an internal combustion engine with pistons that are all relatively horizontal. A straight engine canted 90 degrees from straight up is a flat engine, as is one in which the cylinders are arranged in two banks on either side of a… …   Wikipedia

  • flat — 1. adj., adv., n., & v. adj. (flatter, flattest) 1 a horizontally level (a flat roof). b even; smooth; unbroken; without projection or indentation (a flat stomach). c with a level surface and little depth; shallow (a flat cap; a flat heel). 2… …   Useful english dictionary

  • Flat-twin — A flat twin is a two cylinder internal combustion engine with the cylinders arranged on opposite sides of the crankshaft. Motorcycle useThe best knownFact|date=September 2008 example is in the traditional BMW motorcycle, which has used engines of …   Wikipedia

  • flat cylinders — Found in the flat four and flat six cylinder engines used in Honda s Gold Wings, the cylinders are arranged in a flat, opposing configuration …   Dictionary of automotive terms

  • four — See flat four V four …   Dictionary of automotive terms

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