Tuesday, 22 October 2013

INTERNAL COMBUSTION (IC) ENGINES

An IC engine is one in which the heat transfer to the working
fluid occurs within the engine itself, usually by the combustion
of fuel with the oxygen of air.
In external combustion engines heat is transferred to the
working fluid from the combustion gases via a heat
exchanger. e.g. steam engines; Stirling engines.
IC engines include spark ignition (SI) engines using
petrol as a fuel, and compression ignition (CI) engines
(usually referred to as Diesel engines) using fuel oil,
DERV, etc as a fuel.
In these engines there is a sequence of processes:
· compression
· combustion
· expansion
· exhaust / induction

There are two basic mechanical designs to achieve these four processes in either:-
The basic difference between the petrol engine and the diesel
engine is in the method of ignition and the combustion process,

four strokes of the piston - hence the 4-stroke engine, or
two strokes of the piston - hence 2-stroke engines.





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