Multi-cycle analysis on global engine quantities: Upper plot: scattering of the CA50 (middle of combustion) versus CA2 (start of combustion). Middle plot: Matekunas diagram scattering P_max as a function of the Crank Angle (CA) at which P_max occurs. Lower plot: P_max probability density: each bar displays the bin’s raw count divided by the total number of counts and the bin width; the pressure range 70, 120 is divided in 10 bins equally spaced.