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The '''split-cycle engine''' is a type of [[internal combustion engine]].
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In a conventional [[Otto cycle]] engine, each [[cylinder (engine)|cylinder]] performs four strokes per cycle: intake, compression, power, and exhaust. This means that two revolutions of the [[crankshaft]] are required for each power stroke. The split-cycle engine divides these four strokes between two paired cylinders: one for intake/compression, and another for power/exhaust. Compressed air is transferred from the compression cylinder to the power cylinder through a crossover passage. Fuel is then injected and fired to produce the power stroke.
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==History==
The Backus Water Motor Company of [[Newark, New Jersey]] was producing an early example of a split cycle engine as far back as 1891. The engine, of "a modified A form, with the crank-shaft at the top", was water-cooled and consisted of one working cylinder and one compressing cylinder of equal size and utilized a [[hot-tube ignitor]] system. It was produced in sizes ranging from 1/2 to {{convert|3|hp}} and the company had plans to offer a scaled-up version capable of {{convert|25|hp}} or more.<ref>
The [[Twingle engine]] is a two stroke engine that also uses a displacer piston to provide the air for use in the power cylinder. This was patented in 1912.
The [[Scuderi Engine]] is a design of a split-cycle, [[internal combustion engine]] invented by the late Carmelo J. Scuderi.<ref>[http://marketplace.publicradio.org/shows/2006/08/01/PM200608015.html "Carmelo Scuderi's legacy just revving up," Public Radio's "Marketplace," August 1, 2006]{{dead link|date=December 2011}}</ref> The Scuderi Group, an engineering and licensing company based in [[West Springfield, Massachusetts]] and founded by Carmelo Scuderi’s children, said that the prototype was completed and was unveiled to the public on April 20, 2009.<ref>Wrinn, Bill. "Podcast: First Scuderi Engine Prototype Assembled." airhybridblog. 09 Feb 2009. Topaz Partners. 9 Feb 2009 <http://airhybridblog.com/2009/02/09/podcast-first-scuderi-engine-prototype-assembled></ref><ref>Murray, Charles. "Will Split-Cycle Engine Compete With EV Powertrains?" 23 Sep 2011 <http://www.designnews.com/author.asp?section_id=1386&doc_id=233750></ref>
The TourEngine is a novel opposed-cylinder split-cycle [[internal combustion engine]], invented, patented and under development by Tour Engine Inc. The unique and patented opposed-cylinder configuration of the TourEngine allows minimal dead space and superior thermal management. The first prototype was completed on June, 2008.
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