4-stroke motors in-take valves.?

Question

what is the reason for intaking air into the piston cylinder before it fires, a 2-stroke motor doesn't intake air?

Answer 1

A two-stroke most certainly DOES intake air into the cylinders before it fires. If it didn't, it wouldn't run!

All internal combustion engines use the same basic technology... Intake, compression, ignition/power and exhaust. It's just that a four stroke has four distinct phases, controlled by valves opening and closing, while with a two-stroke engine, intake and exhaust happen at the same time and are controlled by movement of the piston.

Answer 2

2 strokes most certainly do intake air just in a different way.two strokes use air ports and fuel ports in the cylinder walls.air is the most important part of the combustion cycle.you need fuel air compression and ignition for any engine to work.and to the guy below that says 4 strokes have more power is wrong.2 strokes fire every time the piston reaches top dead center.so the have pretty much twice the power and acceleration.so go back to school quizkid and learn something

Answer 3

Both designs intake air along with fuel. The 4-stroke uses a valve configuration to accomplish the task, while a 2-stroke uses ports in the cylinder wall to accomplish.
Two designs, same result.
There must be air along with the fuel to create a fire (caused by the spark), which will cause the nitrogen in the air charge to expand and drive the piston.

Answer 4

It would be impossible to explain here without cutting and pasting from a web site. Suffice it to say that FOUR stroke engines go thru FOUR cycles in their power mode. TWO STROKE engines only go thru two cycles. Thus the difference. 2 bangers use ports (holes) to suck in gas mixture. 4 bangers use valves and thus produce much more power than 2.

4 stroke cycles = intake, compression, power, exhaust
2 stroke = intake/compression, power/exhaust.

Answer 5

click here. a simple *.gif shows how two cycle works.
http://en.wikipedia.org/wiki/Image:Arbeitsweise_Zweitakt.gif