Difference between 2 stroke and 4 stroke engine

The Mechanical engineering, is playing a vital role in today's Technology.
It Assist you to done things with ease, and also it brings the helpful technologies to modernize our society.

So keeping these things in mind, Lets learn about the difference two stroke and four stroke engine.

Let's learn brief about 2 stroke engine and 4 stroke engine.

Two Stroke Engine:-


The working cycle completed in 2 stroke of the Piston or one revolution of the crankshaft that engine called 2 stroke engine.

Two stroke engine gives twice the number of power stroke than the four stroke engine at same engine speed.

For the same power developing a two stroke engine is lighter, less bulky and occupies less floor space. 

Two stroke engine having lighter flywheel so higher mechanical efficiency.
The Thermal efficiency of two stroke engine is lesser than four stroke engine.

Four Stroke Engine:-


The working cycle completed in 4 stroke of the Piston for two revolution of the crankshaft that engine called four stroke engine. 

Four stroke engine having heavier flywheel so it has less mechanical efficiency.

The thermal efficiency of 4 stroke engine is then two stroke engine.

To learn more, check also difference between petrol Engine and diesel engine.

Difference between two stroke and four stroke engine is as follows:-


Difference between 2 stroke and 4 stroke engine
Difference between 2 stroke and 4 stroke

Sr.No

2 stroke

4 stroke

1.

In 2 stroke engine working cycle completed in two stroke of the piston or one revolution of the crankshaft.

In 4 stroke engine working cycle completed in four stroke of the piston or two revolution of the crankshaft.

2.

The construction of 2 stroke engine is simple.

The construction of 4 stroke engine is difficult.

3.

Power production in 2 stroke engine is high Compare to 4 stroke engine.

Power production in 4 stroke engine is low.

4.

Due to high power production Mechanical efficiency is high than 4 stroke engine.

Mechanical efficiency is low compare to 2 stroke engine.

5.

Weight of two stroke engine is low. And it is less Bulky.

Weight of two stroke engine is High & it is more Bulky.

6.

2 stoke engine having Ports. No valves are their.

4 stoke engine having Valves. No ports are their.

7.

Low compression ratio in 2 stroke engine.

High compression ratio in 4 stroke engine.

8.

Due to low compression ratio Thermal efficiency is Low.

Due to high compression ratio Thermal efficiency is High.

9.

Cost of 2 stroke engine is less. Also maintenance is low.

Cost of 4 stroke engine is More. So also maintenance is more.

10.

Due to light flywheel, Engine produces uniform torque on crankshaft.

Due to heavy flywheel, engine is not producing uniform torque on crankshaft.

11.

2 stroke having High specific fuel consumption.

4 stroke having Low specific fuel consumption.

12.

Torque producing is more in 2 stroke engine than 4 stroke engine.

Torque producing is Less in 4 stroke engine than 2 stroke engine.

13.

2 stroke engine operating at high temperature so high lubricating oil is required.

4 stroke engine operating at low temperature compare to 2 stroke engine so low lubricating oil is required.

14.

More smoke produced in 2 stroke engine.

Less smoke produced in 2 stroke engine.

15.

2 stroke engine having Less cubic capacity (cc) than 4 stroke engine.

4 stroke engine having More cubic capacity (cc) than 2 stroke engine.

16.

Power to weight ratio is high.

Power to weight ratio is low.

17.

Scavenging process is required for removing the exhaust gas from the engine cylinder.

Scavenging process is not required for removing the exhaust gas from the engine cylinder.

18.

Applications – Scooters, Two wheelers, Chainsaws, Weed eater  trimmers etc.

Applications – Sedan cars, Racing Cars, 4 wheelers, Trucks, etc.



Here we concluding, If you have any queries about this topic then feel free to comment below.


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