"Four stroke engines & Two stroke Engines"

There are two type of engine cycles: FOUR-STROKE ENGINE or FOUR CYCLE ENGINE which completes a power cycle with four strokes;
a)intake stroke- when fuel & air mixture is taken into the engine through the intake valve.
b)compression stroke- when the piston compresses the air fuel mixture through the up stroke
c)combustion stroke- during the up stroke the spark plug ignites the compressed air fuel mixture
d)exhaust stroke- the piston is pushed down and the burnt mixture in the engine is passed out through the exhaust port..

TWO-STROKE ENGINE or TWO CYCLE engine is a type of internal combustion engine which completes a power cycle with
two strokes (up and down movements)
of the piston during only one crankshaft revolution. In a
two-stroke engine, the end of the
combustion stroke and the beginning
of the compression stroke happen
simultaneously, with the intake and exhaust (or scavenging) functions occurring at the same time. Examples of two stroke engine: lawn mowers, small portable generators e.g tiger

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