This engine is as efficient as a hybrid - without the hybrid. Also, because they're firing after TDC the temperature is lower during combustion makinng the NOx emissions greatly decrease. This means that in a Diesel model (or normal) the high NOx emissions would disappear. The technology exists.

http://69.143.55.21/scuderi%20engine-za.pdf

http://pscuderi.homedns.org/ScuderiEngine.wmv
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http://pscuderi.homedns.org/US20040255882.pdf

http://pscuderi.homedns.org/scuderi%20engine-za.pdf

yeah but firing after TDC kill's power, guess they know something I don't... hmmmm... hard to figure that