help understanding air/fuel/oil flow through chamber....

[quam]

anybody out there know just how the mix circulates?
i'm no pro when it comes to 2strokes, but i understand engines pretty well. i took my sh*t apart last week and it looks like the vacuum of the piston in the cylinder, as well as the vacuum of the crank in the case, pulls open the corresponding reeds to allow mix into the cylinder for combustion and into the case for lubrication.
so what happens to the mix that gets pulled through the bottom reeds after circulating through the case? does is flow up into the combustion chamber? if so, then how does it stay atomized? is that what those small angled ports are for?

 

[hickskateboarder]

there are 4 transfer ports that take the mix from the crank case to the cylinder and only one port going strait from the reeds, so most of it goes into the crank first. when the piston goes up it creates a vacuum in the crank, drawing the mix in thru the reeds. when the piston goes down, reeds close creating high pressure in the crank cause the area is getting smaller cause piston is going down, then when the transfer ports are uncovered, the mix shoots into the cylinder.

how can the mix not stay atomized? remember, at upper rpm's, it is cycling about 130 times a second.... even at idle its like 18 times a second or something....

 

[quam]

nice, thnx for the schoolin man.
so when a port and polish is done, they're increasing flow through all the ports right, including the 4 ports from crankcase to combustion chamber?
doesn't that decrease the compression? or the vacuum force between the 2 chambers?

 

[fmxr47]

there is a good illustration of how a 2-stroke works on howstuffworks.com , helped me understand better

 

[quam]

yeah, i knew the basic concept of it, but seeing the top end of our engine made me start thinkin and wondering about some of the specifics of a 2stroke.

 

[hickskateboarder]

why would it decrrease? if anything the compression would increase cause there is more air iin the cylinder.

 

[quam]

that makes sense. more air displacement to compress......