SOURCE: Scuderi Group

Scuderi Group

June 23, 2010 10:31 ET

Scuderi Engine Obtaining Better Combustion Consistency

Efficiency Increases When One Crossover Passage Is Shut Down

WEST SPRINGFIELD, MA--(Marketwire - June 23, 2010) -  When operating under low load conditions, the pressure -- and ultimately the efficiency -- of the Scuderi Engine prototype increases, and becomes more repeatable from cycle to cycle when one of the two crossover passages is shut off, independent lab tests confirm.

The Scuderi Engine prototype has two crossover (Xovr) passages that connect the two cylinders, which separate the four strokes of the pistons. Each crossover passage has a crossover compression (XovrC) valve on its upstream end and a crossover expansion (XovrE) valve on its downstream end, which control flow through the crossover passage. In one, cylinder intake and compression occur while combustion and exhaust take place in the other. Fuel is injected in the downstream end of the crossover passages just as the XovrE valve opens. Compressed air then travels at sonic velocity from the XovrE passage to the combustion cylinder, where combustion occurs.

In tests of the prototype running at near idle load and speed (i.e., less than 2 bar load and 700 rpm) to loads of up to 4 bar and speeds of up to 1600 rpm, shutting down one of the two crossover passages yields a coefficient of variance (COV) as low as 1.4 percent, according to tests conducted by Southwest Research Institute (SwRI). Typically, a conventional auto engine running on the Otto Cycle will produce COV rates ranging from 2.5 to 4.0 percent. COV is a measure of the variability between each combustion cycle. Lower COV figures correlate with higher efficiency and more complete combustion.

Moreover, the very low COV in the Scuderi Engine indicates that the combustion mix (oxygen and fuel) is even more complete and robust than in a conventional engine. Known as the Scuderi Cycle, this new and proven thermodynamic process in preliminary tests has shown greater power, higher efficiency and lower emissions than a conventional gasoline engine.

"This makes us very confident that, when fully mapped and analyzed, the efficiency of the engine will be even higher than previously predicted, which so far has been the pattern in the measured data we have acquired to date," said Stephen Scuderi, vice president and patent attorney for Scuderi Group.

The Scuderi Engine is anticipated to be the most significant advancement in internal combustion engines since the inception of the Otto Cycle over 130 years ago. The Scuderi Engine uses a unique combustion process known as "firing after top-dead center," which is capable of producing more power, higher efficiency and lower emissions than a conventional gasoline engine. 

To listen to an audio podcast describing this development with the Scuderi Engine, visit For more information about the Scuderi Engine, visit

About Scuderi Group
Based in West Springfield, Mass., USA, with offices in Frankfurt, Germany, Scuderi Group, LLC is a research and development company focused on proliferating its technology through R&D and licensing. Its revolutionary Scuderi Cycle technology, when fully developed, is expected to be the most significant improvement in internal combustion engine efficiency in over 130 years. Scuderi Group's global patent portfolio contains more than 400 patent applications filed in more than 50 countries with more than 100 issued. For more information visit

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