Objectives
-Explain how air cooling, exhaust cooling, and water cooling work to lower engine temperatures.
-Define the basic function of a water pump and give examples of several common types.
-Describe the basic operation of outboard water circulation systems.
-explain the function of a thermostat and a radiator.
-Define the basic function of a water pump and give examples of several common types.
-Describe the basic operation of outboard water circulation systems.
-explain the function of a thermostat and a radiator.
Operating temperatures
The average temperature of burned gasses in the combustion chamber of an air-cooled engine is about 3600 F.
About one third is reduced through the cooling system, the exhaust system carries another third away. The remaining is used to power the engine.
About one third is reduced through the cooling system, the exhaust system carries another third away. The remaining is used to power the engine.
Types of cooling
Air cooled
Conduction is heat transfer through solid material
Convection is heat transfer through the movement of a gas, in this case air.
Water cooled
Water cooled engines typically use a mixture of ethylene glycol (anti-freeze) and water. The anti-freeze has rust inhibitors and well as lubricating properties for the cooling system. The temperature of the engine is regulated by the thermostat and radiator.
In a water cooled system there is also a pump which circulates water throughout the system to provide superior cooling
Conduction is heat transfer through solid material
Convection is heat transfer through the movement of a gas, in this case air.
Water cooled
Water cooled engines typically use a mixture of ethylene glycol (anti-freeze) and water. The anti-freeze has rust inhibitors and well as lubricating properties for the cooling system. The temperature of the engine is regulated by the thermostat and radiator.
In a water cooled system there is also a pump which circulates water throughout the system to provide superior cooling