Straight-twin engine

Norton Commando Interstate, a motorcycle with a parallel-twin engine

Longitudinal straight-twin engine at the rear of a Fiat 500

A straight-twin engine, also known as straight-two, inline-twin, vertical-twin, or parallel-twin is a two-cylinder piston engine which has its cylinders arranged side by side and its pistons connected to a common crankshaft. Compared to V-twins and flat-twins, straight-twins are more compact, simpler, and usually cheaper to make, but may generate more vibration during operation.

单词	Twin cylinder engine
释义	Twin cylinder engine 英语百科 Straight-twin engine A straight-twin engine, also known as straight-two, inline-twin, vertical-twin, or parallel-twin is a two-cylinder piston engine which has its cylinders arranged side by side and its pistons connected to a common crankshaft. Compared to V-twins and flat-twins, straight-twins are more compact, simpler, and usually cheaper to make, but may generate more vibration during operation.
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Twin cylinder engine

Straight-twin engine