What are the classifications of car engines?

What are the classifications of car engines?
Engine Classification according to Fuel Used


Gasoline Engine uses gasoline as fuel.
Diesel Engine uses crude oil as fuel.


Engine Classification according to Method of Cooling


Indirect Cooling System usually called water engine.
Direct Cooling System usually called air cooled engine.


Engine Classification according to Cylinder Arrangement


Vertical or Inline Engine has cylinders have vertical center lines arrange one after the other.
Horizontal Engine has engine with horizontal center line of cylinders.
V Type Engine has engine block or cylinders resembles a letter V shape.
Radial Engine has cylinders arranged in radial manner.


Engine Classification according to Valve Arrangement


T Head Arrangement has valves arranged in both side of cylinder block. All intake valves in one side all exhaust on the other side.


L Head Engine has intake and exhaust valves arrange in one side of cylinder block.
F Head Engine have intake valves in the cylinder head and exhaust valves on one side of cylinder block.
I Head Engine has all intake and exhaust valves located in the cylinder head block.