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Split-single engine
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<p>In <a href="/facts/Internal_combustion_engine/Ju4BXzj0">internal combustion engines</a>, a split-single design is a type of <a href="/facts/Two-stroke_engine/Al4uUeo9">two-stroke</a> where two cylinders share a single <a href="/facts/Combustion_chamber/FNqjDrN8">combustion chamber</a>. </p><p>The first production split-single engine was built in 1918 and the design was used on several motorcycles and cars until the mid-1950s, although <a href="/facts/Puch/djnjdfzP">Puch</a> continued producing split-single engines for motorcycles until 1970. During this time, the design was occasionally used for engines with four or more cylinders. </p>