What components transfers combustion pressure to the connecting rods and crankshaft?

The components that transfer combustion pressure to the connecting rods and crankshaft are the pistons and the piston rings. When fuel and air ignite in the engine's cylinders, the resulting combustion creates high pressure that forces the pistons downward. This linear motion is then converted to rotational motion via the connecting rods, which are attached to the crankshaft. The crankshaft ultimately converts this motion into usable power for the vehicle.