Will the stars align for Scuderi's high-efficiency split-cycle engine?

For more than 100 years people have been trying to come up with an engine design to supercede Nicolaus Otto's four-stroke internal combustion motor. Scuderi is the latest to take a stab, recently unveiling a prototype of a split-cycle engine that relegates the "suck" and "squeeze" strokes to one cylinder, and the "bang" and "blow" strokes to another - for a claimed efficiency improvement of up to 50%, emission reductions of up to 80% and a power density improvement of up to 70%. Meanwhile, it's also able to store large amounts of compressed air, allowing it to run as an air/petrol hybrid when cruising. President Obama's new national efficiency standards represent an opportunity for groups like Scuderi to pitch clever clean engine technology to major manufacturers - but has the split cycle engine got what it takes?

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