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I've talked with these guys at length at the DC auto show. They do already have a fistful of patents. I'm wondering if they keep filing for new and improved patents to keep the technology from becoming openly available when patents expire. I'm wondering if they just want too much $$ to license the engine.
Some of the efficiency comes from:
A) Super high compression. Like 15:1 or greater in the second cylinder. And different comp. ratios for compression stroke and power stroke (like atkinson)
B) Firing ATDC (don't have to compress during combustion)
C) The potential of an Air-hybrid. You can actually store the energy created under compression braking into a large tank (and feed it back into cyl #2 at a later time).
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