(Engine) Cooling Systems

[Ref. Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 7-17, 7-18]

(Engine) Cooling Systems

Back to basic – WHY cooling system is needed? – its function?

Answer: avoiding the engine at high operating temperature

Operating the engine at higher than its designed temperature can led to 4 common consequences:

  1. cause loss of power
  2. excessive oil consumption
  3. detonation
  4. serious permanent damage, such as scoring the cylinder walls, damaging the pistons and
    rings, and burning and warping the valves

Air cooling (by design) is accomplished by air flowing into the engine compartment through openings in front of the engine cowling, through an inlet behind the propeller hub. Baffles route this air over fins attached to the engine cylinders, and other parts of the engine, where the air absorbs the engine heat. Expulsion of the hot air takes place through one or more openings in the lower, aft portion of the engine cowling.

air cooling system is less effective during ground operations, takeoffs, go-arounds and other periods of high-power, low-airspeed operation.

In operation, to avoid excessive engine operating temperatures, increase airspeed, enrich the fuel-air mixture, AND/OR reduce power.


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# Engine System

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