Abstract
The article employs an integrated scientific research method, including systems, kinematic, and comparative analysis, as well as techno-economic modeling. A methodology is proposed for evaluating the economic efficiency of utilizing automotive «swap kits» (complete engine assemblies including auxiliary systems and attachments) and manual transmissions for subsequent operation in stationary machinery drives, using diesel generators as a primary example. An efficiency criterion is introduced based on a comparison of the levelized cost per engine hour, fuel consumption, and total lifecycle savings. The role of gearboxes in the drive design is substantiated. The developed mathematical model, which accounts for capital expenditures, differences in specific fuel consumption, and residual engine life, enables the justification of techno-economic advantages and efficiency conditions. The results of the study are recommended as an engineering methodology for the rapid assessment of swap project efficiency in stationary machinery drive systems.