Engine Systems Overview Mr. Ibave

Engine Systems Every engine requires several systems to work in conjunction with each other. Cooling System Lubrication System Air Intake System Fuel System Ignition System Emission Control System

Cooling System Some older engines were air cooled Modern engines are liquid cooled Coolant is pumped by the water pump through passages in the block and head. Cylinder sleeves have passages around them called water jackets. Coolant is a mixture of antifreeze and water. Used to prevent corrosion and freezing.

Cooling System Coolant is a mixture of antifreeze and water. Used to prevent corrosion and freezing. Ethylene glycol Coolant picks up the heat created by the engine Coolant then flows through a radiator Radiator cools the coolant by releasing heat to the air. Temperature of coolant is maintained by a thermostat Thermostat opens to allow coolant to flow to the radiator Thermostat closes until the coolant is hot enough to need cooling

Lubrication System All engines need a constant supply of lubricant Main purpose is to reduce friction Secondary purpose is to cool engine Most engines are equiped with an oil pan/oil sump. Typically will contain 3 to 7 qts. Some more Engine driven oil pump forces oil through filter, then through passages in block and head Passages are called oil galleries Lubricates all moving parts

Air Intake System Draw air from atmosphere 1 gallon of gas requires 9000 gallons of air Air must be drawn where deep water cannot reach Hydrolock Air is filtered Filtered air passes through throttle valve and into intake manifold.

Fuel System Fuel tank Fuel lines and filter(s) Fuel Injectors Electronic control of the fuel pump and fuel injection Fuel injectors atomize the liquid gasoline into small droplets so that it can be mixed with air.

Ignition System Uses battery voltage to create high-voltage spark Done with ignition control module (ICM) AKA ignitor ICM sends high-voltage to spark plugs Arc across electrodes ignites AF mixture

Emission Control System Includes… Controlling gasoline vapors from being released into the atmosphere Reducing emissions from the exhaust Unburned gasoline emissions are Hydrocarbon (HC) Controlled gases include carbon monoxide, oxides of nitrogen

Evaporative Emission Control System AKA EVAP system Keeps gasoline vapors from being released into the atmosphere

Other Emission Control Systems Positive crankcase ventilation (PCV) Exhaust gas recirculation (EGR) Catalytic converter On-board diagnostics OBDI: Older than 1996 OBDII: 1996 and up