[SoCal Pubbie]

I understand that terms develop specific meanings but if the fuel is ignited within a cylinder, isn't it still an internal combustion engine?

[RegulatorCountry]

It sounds like a sort of direct-drive internal combustion to electrical generation, requiring far fewer moving parts.

[dangerdoc]

Yep and still subject to the laws of thermodynamics.

Carnot efficiency rules still apply, unless it operates at very high temps and pressures, it will be less than 50% efficient like all the other IC engines.

[TheConservator]

That’s why its described as a “new take” on internal combustion engines.

[BwanaNdege]

From the article:

“Aquarius is the latest challenger to the hegemony of the internal combustion engine”

‘hegemony of the internal combustion engine’???

Reporters are such Drama Queens! As soon as someone develops a more fuel efficient engine that is as reliable as the conventional IC engine AND hits the ever-changing EPA regulations then auto makers, small aircraft & marine engine manufacturers, lawnmowers, generator sets..... will flock to it.