Definition
The opening in an engine cylinder through which the fuel-air mixture enters the combustion chamber, controlled by the intake valve.
Plain English
The doorway on a cylinder where the fuel and air go in before being burned.
Context Anchor
Seen in piston-engine induction system discussions, where air moves from the intake system into each engine cylinder.
Derivation
‘Intake’ means taking something in. ‘Port’ comes from the Latin porta, meaning ‘gate’ or ‘opening.’ Together: the gate where the mixture is taken in.
Why Pilots Care
A clean, correctly shaped intake port helps the cylinder fill efficiently, directly affecting power, fuel economy, and smoothness.
Intuition Check
Port does not mean the left side of the airplane here. In this engine context, a port is an opening or passage.
Example Sentence 1
On the intake stroke, the piston moves down and draws the fuel-air mixture through the open intake port.
Example Sentence 2
During the intake stroke the descending piston draws mixture through the open intake valve and into the intake port.