Originally posted by afm
In general terms, what performance change do you enhance if you increase induction by advancing opening or retarding closing of the crank opening.
I.E. advancing opening = more torque
retarding closing = more top end
Or is it the opposite.
Same way with transfer ports, what effect does it have to rise the port or lower it.
AFM
It is about right, but you have to remember of resonble limits and balance-meaningif you keep opening to any of the way try to achive one of the parameters and cross the limit line-engine will just stop perform at all.
Transfer port has to be at certain opening, to have enoough time to transfer all mixture to combustion chamber. Exhaust opening is more complecated. lower exhasut-longer dwelf time-more torq, higher exhaust-smaller dwelf time, less torq, bu higher RPM. Also difference between exhaust and transfer will dictate your pipe performance. There were alot of studies done to find the best suitble difference and so far is about 40 degree. In our aplication little bit different due to our pipe design ( two cycle).
\ Got go, will be later.
Didn't finish.