Difference between two and four stock engine?
Asked by Upendra Singh Last Modified
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Two Stroke Engine: In a two stroke engine, there is a power stroke in every rotation of the crank shaft since the thermodynamic cycle is completed in two strokes of the piston. Because of the above reason, the turning moment is more uniform. So a lighter fly wheel is used in the case of a two stroke...
read more Two Stroke Engine: In a two stroke engine, there is a power stroke in every rotation of the crank shaft since the thermodynamic cycle is completed in two strokes of the piston. Because of the above reason, the turning moment is more uniform. So a lighter fly wheel is used in the case of a two stroke engine. Because of the ability to obtain a power stroke in each rotation of the crank shaft, the power produced is twice compared to four stroke engine if the size is same. There are no valve system provided for two stroke engine, This made the working and design simpler. Due to the absence of valve system and light weight, the initial production cost of two strike engine is low. Four Stroke Engine: In a four stroke engine, there is only a power stroke in every two rotations of the crank shaft since the thermodynamic cycle is completed in four strokes of the piston. Because of the above reason, the turning moment is less uniform. So a heavier fly wheel is used in the case of a four stroke engine. Because of the production of only a power stroke in each two rotations of the crank shaft, the power produced is half compared to two stroke engine if the size is same. There is valve system provided for four stroke engine. This made the working and design of this engine complex. read less
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Two Stroke Engine: In a two stroke engine, there is a power stroke in every rotation of the crank shaft since the thermodynamic cycle is completed in two strokes of the piston. Because of the above reason, the turning moment is more uniform. So a lighter fly wheel is used in the case of a two stroke...
read more Two Stroke Engine: In a two stroke engine, there is a power stroke in every rotation of the crank shaft since the thermodynamic cycle is completed in two strokes of the piston. Because of the above reason, the turning moment is more uniform. So a lighter fly wheel is used in the case of a two stroke engine. Because of the ability to obtain a power stroke in each rotation of the crank shaft, the power produced is twice compared to four stroke engine if the size is same. There are no valve system provided for two stroke engine, This made the working and design simpler. Due to the absence of valve system and light weight, the initial production cost of two strike engine is low. In the case of two stroke engine, the volumetric efficiency is less due to lesser time for induction. Here, thermal efficiency is lower and part load efficiency is poorer. There is chance for incomplete burning due to short circuiting and so causes environmental pollution. These internal combustion engines are used where low cost, compactness and light weight are important considerations. Examples are in scooters, motor cycles, etc.. Four Stroke Engine: In a four stroke engine, there is only a power stroke in every two rotations of the crank shaft since the thermodynamic cycle is completed in four strokes of the piston. Because of the above reason, the turning moment is less uniform. So a heavier fly wheel is used in the case of a four stroke engine. Because of the production of only a power stroke in each two rotations of the crank shaft, the power produced is half compared to two stroke engine if the size is same. There is valve system provided for four stroke engine. This made the working and design of this engine complex. Due to the presence of valve system and increased weight, the initial production cost of four strike engines is high. In the case of four stroke engine, the volumetric efficiency is high due to larger time for induction. Here, thermal efficiency is higher and part load efficiency is better. There is less chance for incomplete burning and so less chances for environmental pollution. These engines are used where efficiency is important. Examples are in cars, buses, trucks, etc.. read less
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2- stroke piston engine has an intake and an exhaust stroke. All air, fuel, and combustion products must be moved in those 2 strokes. A 4-stroke engine has a separate stroke for moving burned (or burning) and un-burned mixtures - intake, compression, expansion, and exhaust.
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Two stroke will have a 180 degree of revolution where as the four stroke has 90 degree of revolution. There are many difference between them two stroke has lesser movable parts as compared to four stroke. Efficiency is more in two stroke as compared to four stroke.
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A two-stroke, 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. This is in contrast to a "four-stroke engine", which requires four strokes of the piston to complete a...
read more A two-stroke, 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. This is in contrast to a "four-stroke engine", which requires four strokes of the piston to complete a power cycle. read less
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Two stroke engine It has one power stroke for each revolution of the crankshaft Engine is light Engine design is simple due to absence of valve mechanism Less cost than 4 stroke More mechanical efficiency due to less friction on a few parts Less output due to mixing of fresh charge with the burnt gases Engine...
read more Two stroke engine It has one power stroke for each revolution of the crankshaft Engine is light Engine design is simple due to absence of valve mechanism Less cost than 4 stroke More mechanical efficiency due to less friction on a few parts Less output due to mixing of fresh charge with the burnt gases Engine runs hotter. Engine consists of inlet and exhaust ports. It consumes more lubricating oil. More wear and tear of moving parts. Used in mopeds, scooters, motorcycles etc. Four stroke engine It has one power stroke for every two revolutions of the crankshaft. Engine is heavy More cost. Less mechanical efficiency due to more friction on many parts. More output due to full fresh charge intake and full burnt gases exhaust. Engine runs cooler. Less fuel consumption and complete burning of fuel. Engine consists of inlet and exhaust valve. Less wear and tear of moving parts. Used in cars, buses, trucks etc. read less
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Antony
Math Magician
For an I.C.Engine to complete a power cycle, it takes two strokes of the piston for a two stroke engine where as for a four stroke engine it takes four strokes of the piston.
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It is not Stock but stroke. In two stroke engine, Stroke means reciprocation of piston from TDC to BDC and BDC to TDC. You get one power stroke after completion of two stroke of the piston while in four stroke engine, you get one power stroke after completion of 4 stroke.
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Amrtha Shashidhar
Passionate Teacher
Two stroke engine: It has one power stroke for each revolution of the crankshaft. Engine is light. Engine design is simple due to absence of valve mechanism. Less cost than 4 stroke. More mechanical efficiency due to less friction on a few parts Less output due to mixing of fresh charge with the burnt...
read more Two stroke engine: It has one power stroke for each revolution of the crankshaft. Engine is light. Engine design is simple due to absence of valve mechanism. Less cost than 4 stroke. More mechanical efficiency due to less friction on a few parts Less output due to mixing of fresh charge with the burnt gases Engine runs hotter. Engine consists of inlet and exhaust ports. It consumes more lubricating oil. More wear and tear of moving parts. Used in mopeds, scooters, motorcycles etc. Four stroke engine: It has one power stroke for every two revolutions of the crankshaft. Engine is heavy. More cost. Less mechanical efficiency due to more friction on many parts. More output due to full fresh charge intake and full burnt gases exhaust. Engine runs cooler. Less fuel consumption and complete burning of fuel. Engine consists of inlet and exhaust valve. Less wear and tear of moving parts. Used in cars, buses, trucks etc. read less
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There are many difference between Two Stroke and Four Stroke engine but the basic difference is that in two stoke engine the working cycle completes in one revolution of crank shaft while in four stroke engine the working cycle completes in two revolutions of crank shaft.
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