Differences Two stroke N Four Stroke Engine

The obvious differences between a two stroke and a four stroke engine:

One difference that is easily noticed is the sound of the engines;
 a two stroke has a higher pitched sound unlike the low pitched sound of the four stroke engine
Another difference noticed when handling an engine is that a four stroke engine weighs more than the two stroke engine

The types of fluids the engines run on:
A two stroke engine requires gas that is mixed with oil
A four stroke engine doesn't require oil to be mixed with gas; therefore less smoke is produced
certain oils are not recommended for Atv's and dirtbikes because they may harm the engine


Other Facts:
A two-stroke engine has valves and a four stroke engine doesn't
The engine's get the name "stroke" because there are four of them in a four-stroke and two in a two-stroke engine

In a four-stroke engine the strokes do these jobs:
-1st Stroke (intake): The piston sucks in the fuel-air-mixture from the carburetorinto the cylinder
-2nd Stoke (Compression): The piston compresses the mixture
-3rd Stroke (Compression): The spark from the spark plug inflames the mixture; the explosion forces the piston to the bottom
-4th Stroke (exhaust): The piston presses the exhaust out of the cylinder
In a two-stroke engine, the engine operates evert second stroke-there are no valves
The use of a fuel with gas and oil mixed, it lubricates the piston and crank shaft
In a two-stroke engine the stroke do these jobs:

-1st Stroke: The compressed fuel and air mixture ignites and then the piston is pressed down but at the same time intake port is covered. The new mixture in the crankcase is now precompressed. Right before the piston reaches the center the exhaust port and overflow conduit are uncovered. Now the mixture theat was in the crankcase rushes into the cylinder displacing the sonsumed mixture.

 


















 -2nd Stoke (Compression): The piston compresses the mixture

-3rd Stroke (Compression): The spark from the spark plug inflames the mixture; the explosion forces the piston to the bottom

 -4th Stroke (exhaust): The piston presses the exhaust out of the cylinder
In a two-stroke engine, the engine operates evert second stroke-there are no valves
The use of a fuel with gas and oil mixed, it lubricates the piston and crank shaft
In a two-stroke engine the stroke do these jobs: