An engine is a "machine" that converts energy into mechanical force or motion.

Energy comes to us in many forms. Usually, though, it does not come
in the correct form to produce power for our transportation. A
transportation device, such as a car, typically needs different types of
power. For example, mechanical energy is needed to push a car forward.
Electrical energy is required to operate its headlights.

Gasoline and diesel engines are examples of energy converters.
Energy converters are designed to accomplish one purpose: to convert
energy into useful work. Engines convert the energy stored in fuels into
power or mechanical energy, which is used to operate the vehicle.

If you look under the hood of a car or a truck, you will see a
heat engine. A heat engine is a device that uses heat energy to do work.
The engine does work by changing heat energy into motion.

Heat engines come in two basic types: external-combustion and internal-combustion. Fuel for an external-combustion engine is burned outside the engine. Fuel for an internal-combustion engine is burned inside it.

Steam engines are external-combustion engines
powered by steam produced outside the engine by using a fuel, such as
coal, to boil water.

The internal-combustion engine is the most common
type of engine used today. Typical automobile engines are
internal-combustion engines, as are the engines in boats, lawn mowers,
and home generators.

Internal-combustion engines may be either reciprocating or rotary. The reciprocating engine, with pistons that move back and forth, is the type used in most automobiles. In a
rotary engine, such as a jet turbine, power is supplied directly to
vanes or other rotating parts.

3D Engine assembly

Caterpillar Engine Animation

Diesel Engine

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