PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 3
CLOSED COOLING SYSTEM.
Air Cooling Systems
a. An air-cooled engine uses air as the principal cooling medium (figure 76 on the
following page). Air-cooled engines are very easily identified by separate finned
cylinders, finned cylinder heads and, in most cases, large cooling fans and
extensive duct work.
b. The primary means of removing heat from an air-cooled engine is by dissipation
to the air. The duct work and the cooling fans cause a constant flow of air over
and around the cylinders and cylinder heads. The finned design of these components
add a tremendous amount of surface area to then so they are able to dissipate an
adequate amount of heat.