Italiano: Confronto diretto tra due schemi di funzionamento del sistema biella-manovella, in alto del tipo simmetrico con corsoio/testacroce, in basso del tipo obliquo, il numero 1 indica il PMI, mentre il numero 2 indica il PMS.
English: Direct comparison between two operating systems of the connecting rod-crank system, at the top of the symmetrical type with sliding / test-cross, at the bottom of the oblique type, the number 1 indicates the BDC, while the number 2 indicates the TDC.
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