Problem. The transition from external to internal mixture formation requires adjusting the organization of gas exchange processes. The subject of the research is the gas exchange indicators of the 1D 8.2/8.7 engine with spark ignition with a carburetor and direct fuel injection (DFI) for the organization of stratified fuel-air charge (SFAC) and stratified weak fuel-air charge (SWFAC). Goal. The purpose of research is to determine ways to improve cylinder cleaning from combustion products and increasing its filling with fresh charge at DFI. Methodology: the following methods were used to conduct a study of the engine according to the load characteristic (n = 3000 min-1) and determine the gas exchange indicators by the coefficients: consumption μ of the purge and exhaust channels; purge air leakage υ; residual gases γ; excess purge air φо; filling ηv; purging φ; use of purge air ηв; k.k.d. purge ηs. Originality. The empirical dependences of changes in gas exchange indicators: μ, υ, γ, φ, ηv on the load were determined. Results. With a carburetor power system γ = 0.24-0.17, φo = 0.32-0.67 (bmep = 0.174-0.45 MPa). At the maximum load (bmep = 0.45 MPa) ηv = 0.5. The use of a hemispherical symmetric combustion chamber with an increase in volume and load creates conditions for reducing γ and increasing ηs to 0.86. With DFI and the organization of the SFAC γ = 0.15-0.13 (bmep = 0.21-0.45 MPa), SWFAC γ = 0.16-0.13 (bmep = 0.144-0.21 MPa), γ = 0.4 (bmep = 0.43 MPa). In the case of SFAC and SWFAC, the maximum values of φо = 0.7 and ηv = 0.52 (bmep = 0.42–0.44 MPa). As the load decreases, the values of φо and ηv from the SWFAC exceed the values from the SFAC by up to 9%. The largest values of ηs = 0.87-0.88 (bmep = 0.21-0.47 MPa) correspond to the SFAC and the hemispherical combustion chamber shifted to the exhaust window. The organization of SWFAC in a hemispherical symmetric combustion chamber of smaller volume contributes to the reduction of ηs from 0.875 to 0.71. Practical value. In order to reduce γ and increase ηv at SWFAC, it is necessary to direct the flow of purge air inside the combustion chamber by installing an additional purge channel opposite the exhaust window.