The Scuderi engine, in 2005–2013 was a claimed new type of engine with claimed benefits. No engine to date has been produced commercially, despite reports of the engine's potential. The Scuderi family behind the engine has been involved in litigation related to investors' funds, and many performance claims have not been substantiated.

The engine, formally called the Scuderi Split Cycle Engine, is a split-cycle, internal combustion engine invented by Carmelo J. Scuderi (April 13, 1925 – October 16, 2002). Scuderi Group, an engineering and licensing company based in West Springfield, Massachusetts and founded by Scuderi's children, is testing a working prototype of the engine that was officially unveiled to the public on April 20, 2009.

In 2009, Scuderi Group released video footage of a naturally aspirated one-liter prototype of the Scuderi engine firing on its own in the laboratory in October, 2009.

Same year, the Scuderi company claimed to have raised $35M to develop the engine, and in 2010 said it was seeking to raise another $40M.

In 2013, the Scuderi company had to pay an SEC fine $100,000 fine and repay monies: for spending shareholder's money on Scuderi family members. And in 2015 further SEC cases against Scuderi followed.

In 2024, automotive industry publication Carbuzz revisited the Scuderi story and concluded that it was a promising engine which failed because the family took investors' funds and turned the project into a Ponzi scheme.

In 2026, Sal and Nick Scuderi told investors that Scuderi Group is still active.

Scuderi engines have paired cylinders, each of which performs two of the tasks (strokes) of a conventional engine. The compression cylinder performs intake and compression. The power cylinder performs combustion and 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.