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The air and the fuel is mixed in a swirl pattern when air pulled into the clylinder so perhaps in some form or another one would think that a beveled surface might allow a better swirl pattern. The question is to lab test each motor with different valves heads, bore, stroke, diesel, not diesel etc to see if there really is any efficiency gain.
With such a small groove one would think it would crud up with carbon and be completely useless.
I wonder if a computer could simultate the efficiency?
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