Worthy of note, combustion is the Wiebe function
of 50% mass fuel burned 7.5 degrees crank angle
after top dead center and combustion duration
10...90% of 12.5 degrees crank angle. Properly developed
jet ignition well coupled to direct injection
may produce even shorter combustion durations of
bulk confined premixed mixtures and the eciency
does not vary too much as this parameter changes.