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In the 2006 EPA documents the efficiency of free piston engines was calculated to be 58%.
OMG, A FREAKIN TWO STROKE. YOU CAN'T POSSIBLY GET IT TO PASS EMISSIONS.
A quote from DOE documents sent to me stating that a rotary engine (not wankel) could never be built that would pass emissions in the US.
Google INNAS Chiron, direct hydraulic pressure free piston engine and a drive design with close to 3 times the regenerative efficiency of gas electric hybrids.
So today, when proposed by Toyota, everything is copacetic.
regards
mech
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