Comparison between 2- stroke and 4- stroke cycle engine
S. No.
|
Criteria of comparison
|
2- stroke cycle engine
|
4- stroke cycle
| ||||||||
engine
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1.
|
Power stroke
|
One
|
Working
|
stroke
|
in
|
One working stroke
| |||||
each
|
cylinder
|
per
|
in each cylinder per
| ||||||||
revolution of crankshaft
|
two
|
revolutions of
| |||||||||
crankshaft
| |||||||||||
2.
|
Weight and size
|
Lighter
|
and
|
compact
|
for
|
Heavier and larger
| |||||
same power
| |||||||||||
3.
|
Turning moment
|
Even and more uniform
|
Less uniform
| ||||||||
4.
|
Flywheel size
|
Smaller
|
Larger
| ||||||||
5.
|
Construction
|
Simpler
|
And
|
easy
|
to
|
More
|
complicated
| ||||
manufacture
|
due
|
to
|
valve
| ||||||||
mechanism
| |||||||||||
6.
|
Moving parts
|
Few in number
|
More
| ||||||||
7.
|
Mechanical efficiency
|
More
|
due
|
to
|
lesser
|
Lesser
| |||||
moving parts
| |||||||||||
8.
|
Thermal efficiency
|
Lesser because a part of
|
More
| ||||||||
air fuel mixture goes as
| |||||||||||
waste
|
with
|
the
|
exhaust
| ||||||||
gases
| |||||||||||
9.
|
Noise
|
More
|
Lesser
| ||||||||
10.
|
Wear and tear
|
More due to smaller size
|
Less
| ||||||||
for the same power
| |||||||||||
11.
|
Scavenging
|
Required
|
Most efficient
| ||||||||
12.
|
Fuel consumption
|
More
|
Less
| ||||||||
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