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...CETANE is ignition delay under compression ignition.
...so, it stands to reason that more delay means a longer time for the combustion pressure to "work," thus capturing more of the energy (same as with advancing timing for more mpg in SI-engines).
...goal is to capture more "pressure-per-degree" of crankshaft rotation, ie: more torque. And, if you make that happen more often/quickly, you get more HP.
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