The ratio of the weight of the charge actually taken in to the weight of the air at standard conditions corresponding to the piston displacement.
|Naturally aspirated 4-stroke diesel||0.83 - 0.86|
|2-stroke diesel||0.8 - 0.95|
|2-stroke diesel, nominal charge efficiency||0.6 - 0.8|
"Diesel Engine Engineering: Thermodynamics, Dynamics, Design, and Control", Andrei Makartchouk
See also: Air Intake Manifold.