 
                        Engine for Forklift - Otherwise called a motor, the engine is a tool which could change energy into a functional mechanical motion. When a motor converts heat energy into motion it is typically referred to as an engine. The engine can come in several kinds like the internal and external combustion engine. An internal combustion engine normally burns a fuel with air and the resulting hot gases are used for creating power. Steam engines are an example of external combustion engines. They use heat to generate motion utilizing a separate working fluid.  
In order to generate a mechanical motion through various electromagnetic fields, the electric motor should take and create electrical energy. This particular type of engine is extremely common. Other kinds of engine can function utilizing non-combustive chemical reactions and some would use springs and function by elastic energy. Pneumatic motors are driven by compressed air. There are different designs depending on the application needed.
ICEs or Internal combustion engines 
An internal combustion engine happens whenever the combustion of fuel combines with an oxidizer in a combustion chamber. Inside an internal combustion engine, the expansion of high pressure gases mixed with high temperatures results in applying direct force to some engine components, for instance, turbine blades, nozzles or pistons. This particular force generates functional mechanical energy by moving the component over a distance. Usually, an ICE has intermittent combustion as seen in the popular 2- and 4-stroke piston motors and the Wankel rotating engine. Nearly all gas turbines, rocket engines and jet engines fall into a second class of internal combustion motors known as continuous combustion, which happens on the same previous principal described.
External combustion engines like for instance steam or Sterling engines vary very much from internal combustion engines. External combustion engines, where the energy is delivered to a working fluid like for instance liquid sodium, hot water and pressurized water or air that are heated in some sort of boiler. The working fluid is not mixed with, comprising or contaminated by combustion products.
Different designs of ICEs have been created and are now available with numerous weaknesses and strengths. If powered by an energy dense fuel, the internal combustion engine delivers an effective power-to-weight ratio. Although ICEs have been successful in many stationary applications, their actual strength lies in mobile applications. Internal combustion engines dominate the power supply utilized for vehicles like for instance aircraft, cars, and boats. Some hand-held power gadgets make use of either ICE or battery power gadgets. 
External combustion engines 
An external combustion engine uses a heat engine where a working fluid, like for instance steam in steam engine or gas in a Stirling engine, is heated by combustion of an external source. This combustion happens via a heat exchanger or through the engine wall. The fluid expands and acts upon the engine mechanism that produces motion. Then, the fluid is cooled, and either compressed and used again or thrown, and cool fluid is pulled in. 
Burning fuel along with the aid of an oxidizer so as to supply the heat is known as "combustion." External thermal engines could be of similar application and configuration but utilize a heat supply from sources such as geothermal, solar, nuclear or exothermic reactions not involving combustion. 
Working fluid can be of whatever constitution, although gas is the most common working fluid. At times a single-phase liquid is occasionally utilized. In Organic Rankine Cycle or in the case of the steam engine, the working fluid varies phases between liquid and gas. 	
                            
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