What are the two main parts of the combustion system?

The combustion system in an engine is primarily focused on the processes that drive the engine through combustion, which involves the ignition of fuel and air, producing gases that propel the vehicle. The combustion process occurs in the cylinders, where the fuel-air mixture is ignited, leading to the expansion of gases that push the pistons.

The cylinders are essential as they are the chambers where combustion takes place, creating the necessary pressure to move the vehicle. The pistons, on the other hand, convert the energy produced from combustion into mechanical energy. As the pistons move up and down within the cylinders, they connect to the crankshaft, translating linear motion into rotational motion to drive the vehicle.

Other options involve components that are vital for the overall function of a vehicle but do not specifically pertain to the main parts of the combustion system. The starter and alternator are involved in starting and maintaining electrical systems in the vehicle, while the carburetor, although related to fuel delivery, does not encompass the core functions of the combustion process itself alongside the pistons. This distinction helps clarify why the cylinders and pistons are considered the central elements of the combustion system.