Company with New Engine Wants Investors

A company called LiquidPiston says:
Traditional engines are inefficient, heavy, and expensive. That’s why we made a better one.
Introducing the X Engine: LiquidPiston’s compact, ultra-efficient, and power-dense engine that runs on our patented thermodynamic cycle.
Our groundbreaking innovation is on track to disrupt a $400 billion industry. Buy shares in LiquidPiston today.
I am not in a position to comment on their “patented thermodynamic cycle,” because they’re not making that public.
What I can you tell, however, is that the overall efficiency of charging and discharging batteries through an electric motor is north of 90%, so the concept of a viable new engine that uses pistons of any type seems impossible.
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