Here are some facts about two and four stroke engines:
TWO STROKE ENGINES
Cycle - Two Strokes:
1.- Compression (intake+compression)
2.- Combustion (combustion+exhaust)
Take a look at the cycle in:
http://science.howstuffworks.com/two-stroke2.htm
Advantages of two stroke engines:
. The engine fires - spark plug ignites - once every revolution of the crankshaft.
. They produce twice the power than four stroke engines.
. They are much simpler than four stroke engines. Fewer parts to worry about.
Disadvantages:
. You have to mix two stroke engine oil with gas, and depending on your consumption, this might be expensive.
. They last less. Lubrication is not as efficient as in a four stroke engine with heavy oil.
. Do not use gas efficiently.
. Pollute more.
FOUR STROKE ENGINES
Cycle - Four Strokes:
1.- Intake
2.- Compression
3.- Combustion
4.- Exhaust
Take a look at the cycle in:
http://science.howstuffworks.com/engine4.htm
Advantages of four stroke engines:
. Last longer than two stroke engines
. More efficient use of gas
. Pollute less than two stroke engines
Disadvantages:
. More complicated. Many more parts to worry about.
. Half as powerful as two stroke engines (for equivalent engines)
. Fires once every two revolutions.
If you want to learn more about two stroke and four stroke engines, take a look at the pages I mention above. You will find extensive information and diagrams that will solve all of your doubts.
Well I hope this gave you some basic information and helped you answer some FAQ about two and four stroke engines! :-)
Enjoy the ride! - Daniel Levy
