Chapter 19, Problem 1RQ

What is the difference between direct injection and indirect injection?

To determine

The difference between direct and indirect injections.

Explanation of Solution

The differences between direct and indirect injections are shown in below table.

S.No.	Direct injection	Indirect injection
1	The fuel is directly injected into the cylinder.	The fuel is injected into the cylinder through a pre-chamber by a narrow opening.
2	The first combustion occurs in the cylinder where the piston experiences a depression.	The first combustion occurs in the pre-chamber.
3	More efficient and more noise.	Less efficient and less noise.