The torque will be big according to the differantial to crank in crank and linkage mechanism by Lagrange formula. That may be fitted to the stroke ratio well. The bigger the one is the bigger the torque is. The crank force is the biggest in this study. The linkage force may incline as the crank mass and linkage length is big. The torque will be big when the stroke ratio is big and the crank mass is inclining on the crank linkage mechanism in vehicle. The force and torque effective turn is Crank angle q3 > linkage angle q2 > piston angle q1>piston displacement s. The torque turn in one status is piston M1> crank M3>linkage M2.