This 3D model represents a 4-cylinder internal combustion engine assembly, showcasing the interaction between pistons, connecting rods, and crankshaft. The model demonstrates how reciprocating motion of pistons is converted into rotational motion through the crankshaft mechanism—one of the core principles of mechanical engineering. Key features: Four piston-cylinder setup Connecting rods and crankshaft mechanism Basic engine kinematics visualization Clean CAD-based assembly design This model is ideal for: Engineering students Mechanical design learning Visualization of engine working principles