How is engine vacuum created?

Engine vacuum is created by the downward movement of the piston during the intake stroke. As the piston moves down, it creates a low-pressure area in the cylinder, which draws in air and fuel from the intake manifold. This flow of air and fuel creates a vacuum, which is used to power various engine components, such as the brake booster, power steering pump, and climate control system.

The amount of vacuum created depends on several factors, including the engine speed, the throttle position, and the camshaft timing. At higher engine speeds, the piston moves down faster, creating a stronger vacuum. When the throttle is open, more air and fuel are drawn into the cylinder, also increasing the vacuum. And finally, the camshaft timing affects the duration of the intake stroke, which can also impact the amount of vacuum created.

Engine vacuum is an important part of the engine's operation, and if it is not properly maintained, it can cause a variety of problems, such as engine stalling, rough idling, and poor fuel economy.