Indirect injection

Indirect injection is a way of putting fuel (like gasoline, diesel, or another type) into an engine's combustion chamber where it can burn and make the engine work.

It is called indirect injection because the fuel is not directly sprayed or injected into the cylinder where the combustion happens. Instead, the fuel is sprayed into a small chamber beside the cylinder, called a pre-chamber. This chamber is connected to the cylinder by a small hole or passage.

When the fuel is sprayed into the pre-chamber, it mixes with air and a small spark ignites it. This creates a small explosion that sends hot gases through the hole or passage and into the cylinder where they burn and push the piston to make the engine work.

This method of injection has several advantages. First, the pre-chamber can be designed to create a more efficient combustion process, which can improve fuel economy, reduce emissions, and increase power output. It can also allow for a wider range of fuel types to be used, as well as a more gradual combustion process that can reduce engine wear and tear.

Indirect injection is commonly used in diesel engines, but it can also be found in some gasoline engines, as well.