Air–fuel ratio

Air-fuel ratio is the term used to describe the amount of air and fuel that is needed to create a fire.

Let's pretend that you are cooking marshmallows over a campfire. To create the fire, you need to gather some wood or kindling, and some matches.

When you light the fire, you need to use the right amount of wood and kindling, and the right amount of matches. If you use too little of either, the fire won't ignite. If you use too much of either, the fire might get too big and be dangerous.

The same idea applies to air-fuel ratio. When we try to create a fire inside an engine, we need to mix together the right amount of fuel and air.

Think about it like baking a cake. You need to mix the right amount of flour, sugar, butter, and eggs to create a yummy cake. If you use too much of one ingredient, the cake will not turn out well.

The same idea applies to fuel and air. If we use too much fuel, the engine won't run efficiently, and might even damage itself. If we use too little fuel, the engine might not run at all.

So, the air-fuel ratio is the correct mixture of fuel and air that we need to make a fire in the engine. Engines need different air-fuel ratios depending on the type of fuel they use and how they are designed. Too lean an air-fuel mixture means there is too much air and not enough fuel, while too rich a mixture means there is too much fuel and not enough air. Getting the right air-fuel ratio is important to keep the engine running properly and safely.