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The paper introduces a recently developed toolset to be implemented into the complex simulation codes for internal combustion engines to treat the calculations dealing with a high-pressure part of the thermodynamic cycle in a four-stroke spark ignition engine. This multi-zone simulating tool works on the basis of a simple quasi-dimensional method reflecting the real combustion chamber geometry and uses a specific approach to describe the species chemical transformation during combustion. Here a standard kinetic scheme is combined adaptively with a flexible method for chemical equilibrium in the cases of abnormally fast chemical reactions to improve the numerical performance of the equation system. Real 3-D combustion chamber geometry is taken into account by means of geometrical characteristics created in advance. A newly generalized tool providing these data is presented here. The new code is also able to work in predictive or inverse mode.