Adnoh:
What would happen to performance on a two stroke if the bottom of the exhaust port was level or even with the top of the transfer ports ??

If you look at an oddy cylinder, the top of the transfer port is half way up the exhaust port.
Why the big overlap ??

The reason I ask is because I had a brain fart today looking at a spare FL350 cylinder.
(By the way I saw something interesting on that set up today and I will post some other time).

With no overlap wouldn't more of the fresh intake charge stay in the cylinder ?? Wouldn't it give high pressure exhaust maximum time to escape and thus lower any pressure in the cylinder ?? With lower pressure in the cylinder the fresh intake charge wouldn't have to over come that pressure to enter, no ??
I suspect this design would probably be a high reving little bugger, but I am just guessing.

Please keep any explanation retard simple.
Thx in advance for any reply.
CO

Interesting thought!

First thought is what about the bottom end.
Second would be cylinder exhaust gas evacuation.
Third would be intake charge strength.

I'll dig up a port map so we can put a pic to the word and work with that.
"H" has a bottom feeder set up GIF on here as pertains to the two stroke cycle, cool animation.

"CO"
If you look at an oddy cylinder, the top of the transfer port is half way up the exhaust port.
Why the big overlap ??

"Adnoh"

I'll dig up a port map so we can put a pic to the word and work with that.

In the pics one can see what CO is referring to in his statement.
The solid black line in the port map pics shows the relation ship between the ports Transfer and exhaust.
In the second port map you will see what is called an AAML. For now just note it for what it is.

not sure where you are going with this but the exhaust needs to open first to start to get the flow out it it were at the same level as the trans port the charge wouldn't know which way to go and would fill the motur.
on closing the exhaust port closes last which allows that expansion chamber super charge to reenter the combustion chamber.
I'm no expert by any means and my understanding could be wrong, it has happened before, just ask my wife

Adnoh seems to be on the same page as me on this one. He knows what I'm asking.

You stated: "but the exhaust needs to open first to start to get the flow out if it were at the same level as the trans port the charge wouldn't know which way to go and would fill the motur."

What I am saying is: "I want the entire exhaust port completely open BEFORE the transfer port opens". I want it all (transfer port) below the exhaust port.
So my question is: "Will this work and if not then why ?".
My reasoning is that is gives the max time for the exhaust to flow out and this high pressure suddenly evacuating the combustion chamber should cause it to pull some of the fresh intake charge when the transfer port suddenly opens. I don't want ANY pressure in the combustion chamber when the transfer port opens. Also the crankcase will be positive as the piston is coming down so there will be some pressure there to assist.
Obviously this is not possible on an oddy porting. The stroke is to small I think. I am just wondering the theory on this current huge overlap of our current porting.
CO

Bump.
Not answered yet.
CO

Not an easy thing co
I have not forgot about you.
Other thing are taking a higher priority .
Keep playing and having fun mean while. I enjoy it very much.
Thanks