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Unsteady flows in IC engines are being extensively simulated with quasi-lD models. Such models are, in particular, well suited for multi-parameter optimization. Unfortunately, their fundamental assumptions often lead to unsatisfactory accuracy, and often there are no rational ways to improve models without usage of measured data. Hence there is a strong need in techniques that rationalize ways to utilize measurements results to ensure better model accuracy. Main principle to build such a technique upon is the possibility to calibrate model by adjusting its free parameters. Rational quasi-1D model's free parameters are found only in the empirical relations used in sub-models for closure. In class of two-stroke engines, sub-model of scavenging affects both flow rate and indicated power output.