What is difference between 2 stroke and 4 stroke engine

In this section we study of what is Difference between 2 stroke and 4 stroke engine.the main difference between 2 stroke engine and 4 stroke engine is, 2 stroke engine is complete in 1 revolution and 4 stroke engine is complete in 2 revolution of crank shaft.

Know we start the difference between 2 stroke and 4 stroke engine as follows:

Difference between 2 stroke and 4 stroke engine

A) 2 stroke engine 

1) 2 stroke engine cycle complete in 2 stroke   of piston in cylinder or one revolution of crank.
2) 2 stroke engine construction is
    Simple, lightweight, small cross section            areas, less bulky 
3) 2 stroke engine are port system, 2 stroke engine have no valve system.

4) 2 stroke  engine  is high power produce than 4 stroke engine so 2 stroke engine has mechanical efficiency is more than 4 stroke engine.
5) 2 stroke engine compression ratio is low than 4 stroke engine so thermal efficiency of 2 stroke engine is less than the 4 stroke engine. 
6) overall efficiency of 2 stroke engine is lower than the 4 stroke engine. 

7) 2 stroke cycle give double number of power stroke compared to the 4 stroke.
  Power stoke produce in 2 stroke engine is equal to the number of revolution. 
That means,
         Number of working stroke is equal to the speed of engine rpm.

8) cost of 2 stroke engine is less than the 4 stroke engine. 
9) 2 stroke engine run at low speed.
10) 2 stroke engine flywheel is lighter than 4 stroke engine. 2 stroke engine flywheel is lighter because this engine is produce uniform torque on crankshaft.

11)  2 stroke engine is high specific fuel consumption.
12) 2 stroke engine has higher exhaust temperature than 4 stroke exhaust temperature so 2 stroke engine thermal efficiency is less than 4 stroke engine. 

13) 2 stroke engine produce more torque than 4 stroke engine.
14) 2 stroke engine  is high lubrication consume because 2 stroke engine is operated at high temperature so it requires high lubrication oil.
15) 2 stroke engine is easy start than 4 stroke engine.
16) 2 stroke engine have low cubic capacity (cc) than 4 stroke engine.

17) 2 stroke engine produce more noise than 4 stroke engine.
18) 2 stroke engine is produce more smoke.
19) lubrication providing to 2 stroke engine is easily.
20) scavenging process is required for removing exhaust gas from cylinder.

21) 2 stroke engine used for
     -  Lighter application
     -  scooter, 2 wheeler.

B) 4 stroke engine 

1) 4 stroke engine cycle complete in 2 stroke   of piston in cylinder or TWO revolution of crank SHAFT.
2) 4 stroke engine construction is
    Difficult, more weight, high cross section            areas, bulky.
3) 4 stroke engine are valve system, 4 stroke engine have no port system.

4) 4 stroke  engine  is low power produce than 2 stroke engine so 4 stroke engine has mechanical efficiency is less than the 2 stroke engine.
5) 4 stroke engine compression ratio is higher than 2 stroke engine, so thermal efficiency of 4 stroke engine is more than the 2 stroke engine. 
6) overall efficiency of 4 stroke engine is higher than the 2 stroke engine. 

7) 4 stroke cycle give half number of power stroke compared to the 2 stroke.
  Power stoke produce in 4 stroke engine is equal to the half number of revolution. 
That means,
         Number of working stroke is equal to the  half speed of engine rpm.

8) cost of 4 stroke engine is more than the 2 stroke engine. 
9) 4 stroke engine run at the low speed.
10)   4 stroke engine flywheel is more weight than 2 stroke engine. 4 stroke engine flywheel is high weigh, because this engine is  not produce uniform torque on crankshaft.

11)  4 stroke engine is low specific fuel consumption.
12) 4 stroke engine has lower exhaust temperature than 2 stroke exhaust temperature so 4 stroke engine thermal efficiency is more than 2 stroke engine. 

13) 4 stroke engine produce less torque than 2 stroke engine.
14) 4 stroke engine  is low  lubrication consume because 4 stroke engine is operated at low temperature so it requires high lubrication oil.
15) 4 stroke engine is not easy start than 2 stroke engine.
16) 4 stroke engine have higher cubic capacity (cc) than 2 stroke engine.

17) 4 stroke engine produce more less than 2 stroke engine.
18)  4 stroke engine is produce less smoke.
19) lubrication providing to 4  stroke engine is not easily.
20) scavenging process is not required for removing exhaust gas from cylinder.

21) 4 stroke engine used for
     -  heavy application
     -  smcar, 4 wheeler.
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