The Engine

A vehicle's engine is the source of its power. That is, the engine does the basic work needed to operate all the other parts of the vehicle. Almost all automobiles contain four-stroke, gasoline-burning engines (See Figure). Although automotive engines come in a wide variety of sizes, models, and designs, the basic operating principles of all engines are the same. In this program, we'll discuss how basic four-stroke engines work, as well as the operation of a variety of engine designs. Naturally, we can't cover every possible type and design of engine in the program. However, once you thoroughly understand the operation of a typical engine, you'll easily be able to apply that knowledge to virtually any type of automotive engine you may come across in the future.

Modern automotive engines contain a variety of electronic and computerized control systems that allow the engine to operate as efficiently as possible. With the use of this modern technology, today's engines can perform in ways that weren't possible years ago. Engines today produce far more power (but fewer harmful exhaust emissions) than similar engines from the past-all while using less fuel! This technology is highly beneficial: the environment is kept cleaner, natural resources are preserved, and the consumer gets a car that performs better and more reliably.



As you learn more about engines and electronic control systems, you'll probably agree that these systems aren't really that hard to understand. In fact, many technicians find that engines equipped with electronic control systems are easier to troubleshoot and repair than older engines. No matter how you feel about electronic controls, the fact is, they're here to stay. Therefore, in order to be a successful auto repair technician, you'll need to understand how these systems work.

If you find the thought of working on electronic controls to be a bit overwhelming, remember that these systems are only a part of the entire engine system. The engine is made up primarily of mechanical parts that are relatively simple in design and operation. Therefore, understanding how the mechanical components of an engine operate is just as important as knowing about the latest electronic control systems.