The 4s engine is nothing but it has two valves one is inlet and another is exhaust. the stroke will be done one by one like first suction,compression,power and exhaust, and for every four stroke there will be one power.this is four stroke engine
an engine in which the different processes called(inhaling the charge,compressing it,burningit,exhausting itoutside)are performed in engine cylinder where piston travels from one dead center to another deadcenter 4 times .
A completed operation of an engine that is Suctionstroke. compression stroke, expansion stroke and exhaust stroke is completed by the single rotaition of the crank shaft. Generally in a four stroke engine suction and compression takes at the first 180" degree of the rotation fo the crank shat and the expansion and exhasut stroke held at the remaining 180"degree of the crank rotaion. so by the complete rotation of 360"degree of a crank shaft all the four operation are completed, and hence it is called as four stroke engine
four stroke engine work on otto cycle.in this engine four process are done.1.suction2.compression3.power4.exhaust.at the time of 1st stroke fuel will enter in to cylinder.entered fuel compressed by the piston from bottom dead center to top dead center.at tdc spark plug ignited to make power stroke to movw piston from tdc to bdc.at the time of exhaust stroke waste air move out by moving piston from bdc to tdc.
4-stroke engine can be defined as a type of engine by which we get a power stroke in every two revolutions of the crank shaft. while in 2-stroke, we get a power stroke in each revolutions of the crank shaft.
Four stroke engine is an engine in which 1 cycle=4 rotations or strokes of crank. The combustion process takes place in 4 stages/parts/strokes. 1st stage-Suction 2nd stage-compression 3rd stage-Combustion & expansion 4th stage-exhaust
4 stroke engines are more fuel efficient as compared to 2 stroke engines but the thermal efficiency of 2 stroke engine is greater than that of 4 stroke engines.
Both diesel & petrol engines are now-a-days available in 4 stroke type. Power produced per cycle by a 4 stroke engine is lesser than that of 2 stroke engine.
In four stroke engine, there are four stroke which are completed in two revolution of the crankshaft which are 2 as in case of 2 stroke.these 4 strokes are suction, compression, power or expansion & exhaust.
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