ORIGINAL: Hobbsy
Mr. Reivers, please allow me to use another, "for example" and then you can tell me if I'm understanding this correctly. If one were to set up a slow turning torquey engine with a stuffed crankcase and high crankcase compression the result would be high speed flow velocities through the transfer ports which in a slower turning engine could result in much of the fuel/air mixture flowing right out the exhaust port. Does that big long sentence sound logical? Thanks, Dave
Yes Dave, that is very logical.
In engines, it is all about time-area for the porting.
A slow turning engine with highly stuffed crankcase would need very small transfer ports, and there probably would be too much time between transfer closing and exhaust closing. Such a setup is used for racey engines, not low rpm torquers.
Like Jens said, a very well tuned pipe system could make use of this long period. Because of the long period, the pipe should not be sharply tuned, but very mild in order to have a reflecting wave of long duration..
All in all a difficult setup. In your case it would bebetter to have less crankcase stuffing and larger transfer ports with quite short time between transfer closing and exhaust closing.
For those interested, you can download a copy of the Jennings handbook from my site.
www.prme.nl/download/Jennings_2stroke-guide.pdf