afzal

4 stroke or 2 stroke!!!!!!!!!!!

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hey.... what is the difference between 4 stroke & 2 stroke engine?.....how does it works (mechanism of fuel consumption) what is the difference between power output between the two?? smiley1.gifsmiley1.gif

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Hi Afzal...and we are really sorry if you havn't yet recieved any reply for your querry. Well a 4s engine differs from a 2s engine in means of number of strokes it needs to complete a cycle.     In a 2s engine,the piston reciprocates from TDC to BDC once,executing two strokes at a time. n then going back to TDC with two more strokes. This way the crank revolves only once and piston reciprocates twice(up and down).  Whereas in a 4s engine,there is reciprocatory motion for every individual stroke. thus in 4s the pistion reciprocates 4times(up,down,up,down) and and hence the crank rotates 2 times.   and hence we say 2s completes cycle on 360 degrees(due to single revolution of crank) and a 4s completes cycle in 720 degrees(due to 2 revolutions of crank). Mechanism of fuel consumption is moreovwer same in both,however due to double crank rotation in 4s for same quantity of fuel,the 4s gives better mileage and stands better on efficiency.

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hi,

 

the name itself tells u the difference. 4 stroke engine operates in 4 strokes i.e., 1. suction stroke, 2. compression stroke, 3. expansion stroke(power producing stroke), 4. exhaust stroke. all these strokes are common for both 4S petrol and diesel engines.

 

2 stroke engines operates in 2 strokes i.e., 1. downward stroke, 2. upward stroke.

 

4 stroke engines are highly efficient than 2 stroke engines. pollution is more in 2 stroke, thats y its not used in cars & bikes nowadays. but weight of 2 stroke engines are lesser than 4S, so faster the pickup.

 

 

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hi ,

the stroke means movement from cylinder top end to bottom end or viceversa.

u can refer books like Thermal engineering by Rajput, Automotive mechanics by Crouse & Anglin.

u can also search thro google or wikipedia.

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