When it comes to car maintenance there can be so many moving parts and so many systems, not to mention subsystems, that someone who hasn't already spent years working on them may not understand them. This is perfectly normal, because most people do not really know how their own car engine works, or how the mechanical and chemical processes ignite just inches away from them each day. This is why buying local car engine parts has its positives, because it puts you in a position to ask someone more knowledgeable than you about what you are buying. One may wonder what the most basic of these mysterious moving parts are, and that is fairly simple. Using the engine as an example, the cylinder would be considered the core and the pistons move up and down within the cylinders. This is a pretty typical engine setup, even in outdoor equipment like lawn mowers. There are two banks, each holding cylinders and they are set at an angle to each other.