4 stroke vs 2 stroke engine

Comparison of Four-stroke and two-stroke engine:
Four-stroke engine
Two-stroke engine
1.
Four stroke of the piston and two revolution of crankshaft
Two stroke of the piston and one revolution of crankshaft
2.
One power stroke in every two revolution of crankshaft
One power stroke in each revolution of crankshaft
3.
Heavier flywheel due to non-uniform turning movement
Lighter flywheel due to more uniform turning movement
4.
Power produce is less
Theoretically power produce is twice than the four stroke engine for same size
5.
Heavy and bulky
Light and compact
6.
Lesser cooling and lubrication requirements
Greater cooling and lubrication requirements
7.
Lesser rate of wear and tear
Higher rate of wear and tear
8.
Contains valve and valve mechanism
Contains ports arrangement
9.
Higher initial cost
Cheaper initial cost
10.
Volumetric efficiency is more due to greater time of induction
Volumetric efficiency less due to lesser time of induction
11.
Thermal efficiency is high and also part load efficiency better
Thermal efficiency is low, part load efficiency lesser
12.
It is used where efficiency is important.
Ex-cars, buses, trucks, tractors, industrial engines, aero planes, power generation etc.
It is used where low cost, compactness and light weight are important.
Ex-lawn mowers, scooters, motor cycles, mopeds, propulsion ship etc.