Cooling Systems Chapter #12. Principles of Engine Cooling Average temp of burned gases in combustion chamber of an air-cooled engine is about 3,600 degrees.

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Presentation transcript:

Cooling Systems Chapter #12

Principles of Engine Cooling Average temp of burned gases in combustion chamber of an air-cooled engine is about 3,600 degrees 1/3 heat used to produce mechanical energy 1/3 heat carried away by exhaust 1/3 heat carried away by cooling system Excessive heat can lead to pre-ignition

Air Cooling Thin cooling fins increase the surface area Flywheel has fins that blow air – shroud directs air over cylinder fins Everything must be kept clean to work efficiently Convection

Liquid Cooling Pressurized cooling system – Radiator – Water pump – Radiator cap – Hoses – Fan – Thermostat

Thermostat

Outboard engine Cooling Systems Sliding vane pump, rotor-type pump, plunger pump, vari-volume pump