Main Category :Transport Sub Category :Motor vehicles Leelananda Jayasuriya A typical construction of this internal combustion engine development consists two banks of cylinders arranged side by side. The pistons are connected with straight piston rods, having a pin on its' sterm to engage inside a groove provided at mechanical linkage. The mechanical linkage is a rigid rod in which the central point is fixed to oscillating shaft. The drive force of the piston is transmitted from piston rod to oscillating shaft through mechanical linkage.