How a Car Engine Works: A Simple Guide for Beginners
Car engines are complicated. When you sit down to learn how a car engine works, it can seem overwhelming. But the basics are actually simple. When you turn the key, a few controlled processes occur inside the engine to make power. And that power turns your car. Let’s explore the basics of how an engine works in a practical and easy way.
What is a car engine?
A car engine is a machine that turns fuel into power (mechanical energy). That power turns your car. Put simply: it burns fuel for power (for moving). Most vehicles today have an internal combustion engine. That means the fuel is burnt in the engine for power.
The Four Main Strokes
Most car engines operate on a cycle of 4 strokes. This 4-stroke cycle has the following events:
- Intake Stroke: Air and fuel enter the cylinder.
- Compression Stroke: The mixture is compressed (squeezed together).
- Power Stroke: A spark ignites the compressed air and fuel, causing an explosion that pushes the piston down, creating power.
- Exhaust Stroke: Expelled gas leaves the cylinder.
These 4 strokes happen thousands of times per minute.
Basic Car Engine Parts
Let’s now look at some of the main parts in an engine:
- Cylinders (where fuel burns)
- Pistons (move up and down to generate power)
- Crankshaft (turns the movement into power)
- Spark Plugs (creates the spark)
- Valves (controls air and fuel flow)
Now, let’s take a moment to look at how these parts work together to make power.
How Power Is Created
When fuel burns inside the cylinder, a small explosion occurs. This explosion pushes down the piston and turns the crankshaft. The turning movement of the crankshaft then transfers power to your wheels. In short: chemical energy (fuel) turns into mechanical energy (movement).
Why do we need air and fuel?
Engines need both air and fuel for the explosion process. The ratio of air and fuel is very important to ensure maximum fuel efficiency. A little bit less or more will impact power output, performance, or result in an engine failure.
Basic Engine Types
There are different types of engines, but the 2 common ones in use today are:
- Gasoline Engines
- Diesel Engines
Both gasoline and diesel engines require air and fuel to generate power. Gasoline engines use spark plugs while diesel engines do not.
What to Remember about Engines
So what can you take away about an engine? It might sound complicated at first but if you learn the 4 basic strokes, you now understand an engine. The more components you learn about an engine, the easier it becomes.
At AutoSkillCore, we take the time to teach the simple and basic steps of engine components so you don’t need to be an engineer to learn it. We simplify complex automotive systems into simple, easy, clear-to-learn and easy-to-understand lessons so everyone can learn automotive from zero.