2 Answers

CLASSIFICATION OF INTERNAL COMBUSTION ENGINES

Internal combustion engines may be divided into general groups according to: the type of fuel used the method of ignition, and the number of strokes that constitute a working cycle.

The three major types of fuels used are gasoline, gaseous fuels, and fuel oils.

The fuel, gasoline, is in liquid form and is vaporized by being drawn through
fine jets by the powerful suction of the engine during the intake stroke. At the same time, air is drawn in to mix with the vaporized fuel.

Gaseous fuels include natural gas, blast furnace gas, sewage gas, and producer
gas. Natural gas is the most commonly used of these and engines burning natural gas are used in locations where this fuel is plentiful and particularly as the drive units for gas compression machinery.

Similarly, engines burning the other types of gaseous fuels have become common
in sewage treatment plants and steel plants where gaseous fuels are readily available.

Fuel oils include light oils such as kerosene and heavier oils such as diesel
fuel. The heavy oil engine, commonly called the diesel engine, has many applications such as a prime mover for electrical generation in capacities up to 15 000 kW. 

http://industries-news.blogspot.com/2010/07/classification-of-internal-combustion.html

Colleen

We're just too old school Vinny, The world changed as did combustible engines apparently ;)

Classification?? Didn't you just classify it with your question?