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The purpose is to make the mixture completely vaporized and homogenous, which means every CC of combustion shamber area has the exact same percentage of air and fuel. The potential is to get an IC engine to 60% thermal efficiency as a peak BSFC measurement.
Higher than that requires rethinking every single loss source of which one significant one is reciprocation itself.
Google "Animated Engines Gnome" to see a piston in cylinder engine that does not reciprocate.
regards
Mech
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