Advertisement
INTAKE stroke: on the intake or induction stroke of the piston, the piston descends from the top of the
cylinder to the bottom of the cylinder, reducing the pressure inside the cylinder. A mixture of fuel and air,
is forced by atmospheric pressure into the cylinder through the intake port. The intake valve(s) then
close. The volume of air/fuel mixture that is drawn into the cylinder, relative to the volume of the
cylinder is called, the volumetric efficiency of the engine.
Detail
Piston moves from TDC to BDC
Intake valve open
Exhaust valve closed
Piston movement causes an area of low pressure to develop in the combustion chamber.
Higher ambient atmospheric pressure forces air through the intake system.
In gas carbureted engine the air picks up the fuel as it passes through the carburetor.
In gas fuel injected engines the gas is added to the air through an injector.
In Diesel engines the fuel is injected into the cylinder at the end of the compression stroke.
180 degrees of rotation
Anything that restricts the flow of air will reduce engine performance.
Advertisement
