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