1. Common Engine Classifications
Cylinder arrangement
Number of cylinders
Cooling system type
Valve location
Camshaft location

2. Common Engine Classifications
Combustion chamber design
Type of fuel burned
Type of ignition
Number of strokes per cycle
Number of valves per cylinder
Type of aspiration

3. Cylinder Arrangement
Refers to the position of the cylinders in relation to the crankshaft
There are five basic cylinder arrangements:
inline
V-type
slant
W-type
opposed

4. Cylinder Arrangement

5. Number of Cylinders
Most car and truck engines have either 4, 6, or 8 cylinders
Some may have 3, 5, 10, 12, or 16 cylinders
Engine power and smoothness are enhanced by using more cylinders

6. Cylinder Numbering and Firing Order

7. Cooling System Type There are two types of cooling systems:
Liquid cooling system
surrounds the cylinder with coolant
coolant carries combustion heat out of the cylinder head and engine block
Air cooling system
circulates air over cooling fins on the cylinders
air removes heat from the cylinders

8. Cooling System Type
A. Air cooling
B. Liquid cooling

9. VIN Locations and Decoding
Located on the door, on the dashboard, or in the engine compartment