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Concept Engines

[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]

Motiv Engines introduces 2nd-generation split-cycle concept; MkII Clarke-Brayton heavy-duty engine being designed for LNG

May 08, 2014

Section of the MkII Clarke-Brayton split-cycle engine. Note the three different cylinder sizes. Air moves sequentially from induction (top cylinder) to combustion (middle cylinder) to expansion (bottom cylinder). Click to enlarge.

Motiv Engines, LLC introduced the second-generation of its engine concept dubbed the MkII Clarke-Brayton Engine, which it intends to develop into a heavy-duty on-highway engine fueled by liquid natural gas (LNG). The prototype is fueled by diesel, a first step in proving the technology before developing a new LNG fuel system.

The MkII Clarke-Brayton Engine is a boxer-configuration split-cycle engine implementing what Motiv calls the Clarke-Brayton cycle. The thermodynamics of the engine are virtually identical to the company’s previous CCI (Compact Compression Ignition) design, as described in a 2013 SAE paper, but are implemented in a much more conventional way.

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Dearman liquid air engine moving into performance mapping, in-vehicle trials; diesel hybrid potential

January 17, 2014

The Dearman liquid air engine—an innovative heat engine that uses liquid air (or liquid nitrogen) as a “fuel” and emits cold air as exhaust (earlier post)—completed its shakedown testing milestone at the end of 2013 at Imperial College, London, and is moving into a three-month program of tests and performance mapping.

The developer, Dearman Engine Company (DEC), confirms that the engine remains on track for integration and installation on a vehicle by MIRA (Motor Industry Research Association) in the first half of this year. The project—in partnership with MIRA, Air Products and Loughborough University and jointly funded by the consortium partners and the UK Government (IDP8)—will demonstrate and test the Dearman Engine on a refrigerated truck providing zero-emission cooling and power during 2014, before moving to full on-road field trials.

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SEC issues cease-and-desist order against split-cycle engine developer Scuderi Group for violations of Securities Act

June 01, 2013

The US Securities and Exchange Commission (SEC) has issued a cease-and desist order against split-cycle engine developer Scuderi Group (earlier post) and its president, Salvatore Scuderi, as well as a $100,000-fine against Salvatore Scuderi for violations of the Securities Act including unregistered stock offerings and “misleading disclosures regarding the use of offerings proceeds.”

The Scuderi Engine is a split-cycle design that divides the four strokes of a conventional combustion cycle over two paired cylinders. Intake air is compressed in the compression cylinder and transferred to the power cylinder for combustion. The engine has two crossover passages that connect the two cylinders, which separate the four strokes of the pistons. The combination of discrete, asymmetrically sized cylinders and fully variable valvetrain promises the ability to vary displacement ratios, bore-stroke ratios, compression-expansion ratios, compression-expansion phasing, and gas transfer phasing for engine optimization—i.e., a more efficient internal combustion engine.

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Liquid Air Energy Network forms in UK; focus on transportation and energy storage

May 09, 2013

Example power cycle of the cryogenic (e.g., liquid air) Dearman piston engine. Source: Dearman Engine Company. Click to enlarge.

A new new forum for the advocacy and development of liquid air as an alternative technology to harness waste and surplus energy within power and transport—the Liquid Air Energy Network (LAEN)—has formed in the UK.

The UK Centre for Low Carbon Futures published a multi-partner research report—Liquid Air in the energy and transport systems: Opportunities for industry and innovation in the UK—and presented the results at a a conference at the Royal Academy of Engineering in London. The work was conducted by a collaboration including industrial partners Arup, Dearman Engine Company, E4 Tech, Highview, Messer Group and Ricardo, as well as academics from the Universities of Leeds, Birmingham, Strathclyde, Brighton and Imperial College London.

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