1. Engine Systems Overview
Mr. Ibave

2. 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

3. 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.

4. 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

8. 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

9. 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.

12. 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.

14. 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

16. 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

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

19. 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